KR101194483B1 - Direct current power supply apparatus and air conditioner using the same - Google Patents

Abstract

Provided is a DC power supply device that realizes an appropriate power factor with high efficiency at low load and high power factor and high efficiency at high load while suppressing power supply harmonic current with a cheap circuit configuration. 1 / from the zero cross point of the AC power supply detected by the zero cross detection means when the value of the ratio between the target DC voltage set by the target voltage setting means and the power supply voltage detected by the power supply voltage detection means is less than a predetermined value. During two cycles, the switching means are shorted twice, and the first and second short circuit intervals of the two short circuits are 0.2 to 0.4 kHz when the power supply frequency detected by the frequency detecting means is 50 kHz. If the value of the ratio is greater than or equal to the predetermined value, then the number of short circuits of the switching means is increased more than two times according to the value of the ratio, and the motor of the built-in apparatus Switch the operating noise frequency to the number of short circuits in which the noise frequency of the DC power supply is not exceeded.

Description

DC power supply and air conditioner using the same {DIRECT CURRENT POWER SUPPLY APPARATUS AND AIR CONDITIONER USING THE SAME}

The present invention relates to a DC power supply which converts an AC voltage obtained from an AC power supply into a DC power supply and suppresses a power supply harmonic current to realize a high power factor and high efficiency, and an air conditioner using the same.

In an apparatus such as an air conditioner having a motor load driven by an inverter, as a method of increasing the efficiency, a method of reducing losses in an inverter by winding a large number of coil windings of a motor and reducing a current flowing through the motor is well known. have.

However, in the case of actually performing this method, since the induced voltage of the motor increases in proportion to the number of turns of the coil, the DC power supply mounted in the apparatus needs to increase the DC voltage supplied to the inverter by an increase corresponding to the induced voltage. There is.

At the same time, high power factor and low harmonic current are required for the DC power supply device in order to reduce the burden on the power transmission equipment. Various methods for controlling the waveform and the DC voltage of the input current have been proposed by connecting and shorting the reactor. As a conventional technique of this kind, Japanese Unexamined Patent Application Publication No. 63-13204, Japanese Patent No. 2809463, Japanese Patent Application Laid-Open No. 10-201248, Japanese Patent Application Laid-Open No. 2003-153543, Japanese Patent Application Laid-Open No. 2006-174689, and Japanese Patent 03485047. Japanese Patent Application Laid-Open No. 2009-100499 is known.

Patent document 1 is equipped with the power supply current detection circuit which detects an AC power supply current, and determines an upper limit and a lower limit of a current, and controls short circuit timing by comparing with a detection current. As a result, the power supply current can be improved by several short circuits in the power supply half cycle, and thus a power supply circuit capable of achieving high efficiency and high power factor is described.

Patent Literature 2 includes an instantaneous power supply current detection circuit, sets a coefficient in accordance with a load state, creates a flow ratio that defines the operation of the switching element based on the product of the coefficient and the current information, It is to operate the switching element. This clearly defines the switching timing in Patent Literature 1, thereby realizing the suppression of the power supply harmonic current and the high power factor, and controlling the DC voltage. In addition, by changing the coefficient according to the load and stopping the switching operation near the peak of the power supply current, high efficiency operation is possible by changing the number of switching and the DC voltage. A power supply device and a power factor improvement method are described.

Patent document 3 detects a zero cross point every half cycle of an AC power supply, delays the switching means by a predetermined time from the zero cross point, and turns off after a predetermined on period, thereby extending the conduction width of the input current from the AC power supply. Therefore, a high direct current voltage can be obtained by improving the power factor and supplying the energy stored in the reactor to the smoothing capacitor. By turning on only once, the power supply device which can improve power factor with high efficiency is demonstrated.

Patent Literature 4 provides a reactor having one end connected to an AC power supply and a bidirectional conducting short circuit device that short-circuits / opens an AC power supply through the reactor. Or in a partial switching mode in which the short-circuit operation is performed one or more times in a half cycle of the power supply, or in a high-frequency switching mode in which the short-circuit operation is performed at a high frequency. As a result, the loss can be reduced over the entire operating region with a large load, thereby improving the efficiency, and the power supply can be stably performed by improving the power factor. Moreover, the control method of the power supply apparatus, the motor drive apparatus, and the power supply apparatus which can solve the high frequency problem in both a load and a power supply is demonstrated.

Patent documents 5 to 7 describe a DC power supply device and an air conditioner that realize a high power factor DC power supply device by changing the number of short circuits of the switching element according to the load.

[Patent Document 1] Japanese Patent Application Laid-Open No. 63-13204 [Patent Document 2] Japanese Patent No. 2809463 [Patent Document 3] Japanese Patent Application Laid-Open No. 10-201248 [Patent Document 4] Japanese Patent Application Laid-Open No. 2003-153543 [Patent Document 5] Japanese Patent Application Laid-Open No. 2006-174689 [Patent Document 6] Japanese Patent No. 03485047 [Patent Document 7] Japanese Patent Application Laid-Open No. 2009-100499

At present, the domestic air conditioner is required to consider the environment, and resource saving and energy saving have been strongly demanded. In addition, there is a need for a product suitable for the regulation of harmonic currents that adversely affect the power supply with the surge of electronic control devices.

However, the prior art described above only partially satisfies these requirements, and has the following problems.

In Patent Literature 1, a circuit is complicated because a current detection circuit for detecting an instantaneous alternating current and a switching element circuit for determining switching timing are required. Furthermore, the method of controlling the DC voltage, the method of determining the upper limit value and the lower limit value of the optimum current is not described, and it is not suitable for high efficiency control of an electric motor that requires boosting of the DC voltage wound around the coil winding. In addition, there is no mention of a method of maintaining the DC output voltage.

In patent document 2, when a load is small, high efficiency operation | movement is performed by making DC voltage low and switching frequency small, and when the load is large, high DC voltage and high switching frequency can perform high power factor operation. However, instantaneous AC power supply current is required, which complicates the circuit. In addition, when the number of times of switching is reduced by giving priority to efficiency, the ripple of the alternating current becomes large, leading to a decrease in power factor and an increase in harmonic current. In addition, the DC output voltage is maintained by increasing and decreasing the number of short circuits and the switching duty.

In Patent Document 3, when the DC voltage is set to be high, the short-circuited waveform becomes distorted, so that the power source harmonic current increases, and the JIS standard value cannot be satisfied while obtaining a high power factor. In addition, the present invention performs a short-circuit operation only once in a half cycle of the power supply, and there is no mention of a pulse interval.

In Patent Document 4, the DC output voltage can be controlled by controlling the short circuit start time, the short circuit time, and the number of short circuits of the switching element in the partial switching mode, but no specific means for suppressing harmonics is described. Therefore, by switching modes, either one of high efficiency and harmonic suppression (high power factor) can be selected, but both high efficiency and harmonic suppression cannot be achieved.

In Patent Documents 5 to 7, there is no clear description of the optimum switching timing.

SUMMARY OF THE INVENTION An object of the present invention is to provide a DC power supply device that realizes high efficiency and proper power factor at low loads and high power factor and moderate efficiency at high loads while suppressing power source harmonic currents.

The problem to be solved by the present invention is a rectifier circuit for converting AC power input from an AC power source into DC power, a reactor connected between the AC power source and the rectifier circuit, and shorting the AC power source through the reactor. Switching means, a target voltage setting means of the DC power, a frequency detecting means for detecting a frequency of the AC power supply, a power supply voltage detecting means for detecting a power supply voltage of the AC power supply, and a zero cross point of the AC power supply. A DC power supply having a zero cross detecting means for detecting, a DC voltage detecting means for detecting a DC voltage which is an output of the rectifying circuit, and a switching control means for shorting and opening the switching means in synchronization with the zero cross point. The switching control means is a target DC voltage set by the target voltage setting means. When the value of the ratio with the power supply voltage detected by the power supply voltage detection means is less than a predetermined value, the switching means is turned off during a half cycle from the zero cross point of the AC power supply detected by the zero cross detection means. Short-circuit twice and short-circuit intervals of the second and second short circuits are 0.2 to 0.4 kHz when the power supply frequency detected by the frequency detecting means is 50 kHz, and 0.16 when the power supply frequency is 60 kHz. To 0.33 kHz, after which the number of short circuits of the switching means is increased more than two times depending on the value of the ratio, and the operating noise frequency of the built-in motor This is achieved by switching to the number of short circuits in which the noise frequency of the DC power supply is not exceeded.

The DC power supply device according to claim 2, wherein the DC power supply device according to claim 1, wherein the switching control means is a value of a ratio between a target DC voltage set by the target voltage setting means and a power supply voltage detected by the power supply voltage detecting means. In the case of more than this predetermined value, similarly to the case of the said 2nd short circuit, the said switching means is short-circulated twice in 1/2 cycle from the zero cross point of the said AC power supply detected by the said zero cross detection means, The first and second short circuit intervals of the second short circuit are 0.2 to 0.4 kHz when the power supply frequency detected by the frequency detecting means is 50 kHz, and 0.16 to 0.33 kHz when the power supply frequency is 60 kHz, After that, when the value of the ratio is equal to or greater than a predetermined value, the number of short circuits of the switching means is further included more than the number of times according to the value of the ratio. Of the noise to the frequency of the AC adapter is switched to does not exceed the number of short-circuit with respect to the driving frequency of the motor noise.

The DC power supply device according to claim 3 is the DC power supply device according to claim 1 or 2, wherein the switching control means has a short circuit time after the third time of 0.25 때에는 when the power frequency is 50 kHz, or 0.2 ㎳ or less when the 60 ㎐ power. It is to be a range.

The DC power supply device according to claim 4, wherein the DC power supply device according to claim 1 or 2 WHEREIN: When the number of short circuits of the said switching means is increased from M times to M + 1 circuit, the sum total of the short circuit time from the M time after an increase of a short circuit count. Is smaller than the total value of the short circuit times before increasing the number of short circuits.

The DC power supply device according to claim 5, wherein the DC power supply device according to claim 1 or 2 WHEREIN: When the number of short circuits of the switching means is increased from M times to M + 1 times, the total value of the short circuit times from the M + 1th time is obtained. It is made to be equal to the total value of the short circuit times up to the Mth time before the number of short circuits increases.

The DC power supply of Claim 6 is a DC power supply of Claim 1 or 2 WHEREIN: When reducing the number of short circuits of the said switching means from M times to M-1 circuits, the sum total of the short circuit time after short circuit count reduction is a short circuit count. It is increasing than the total value of the short circuit time to the M-1 time before a decrease.

The DC power supply of Claim 7 is a DC power supply of Claim 1 or 2 WHEREIN: When reducing the number of short circuits of the said switching means from M times to M-1 circuits, the sum of the short circuit times after short circuit count reduction is made into the short circuit count. It is made to be equal to the total value of the short-circuit time up to the Mth time before the reduction.

The DC power supply device according to claim 8, further comprising: an input current detection means for detecting an input current from the AC power supply according to the DC power supply device according to claim 3, wherein the switching control means is provided for two to six times of the switching means. The number of short circuits is determined according to the value of the ratio and the input current detected by the input current detecting means.

The DC power supply device according to claim 9, further comprising load amount detecting means for detecting a load amount connected to the DC power supply, wherein the switching control means includes two to six times of the switching means. The number of short circuits is determined in accordance with the value of the ratio and the load amount detected by the load amount detecting means.

The DC power supply device according to claim 10 is the DC power supply device according to claim 9, wherein the load connected to the DC power source is a motor, the load amount is an applied voltage to the motor, and the load amount detection unit is applied to the motor. And a motor applied voltage detecting means for detecting a voltage, wherein the switching control means sets the number of short circuits of the switching means from 2 to 6 times to the value of the ratio and the motor applied voltage detected by the motor applied voltage detecting means. Therefore, it is decided.

The DC power supply device according to claim 11 is the DC power supply device according to claim 9, wherein the load connected to the DC power source is a motor, the load amount is the rotation speed of the motor, and the rotation speed of the motor is used as the load amount detection means. And a motor rotation speed detecting means for detecting, wherein the switching control means determines the number of short circuits from 2 to 6 times of the switching means in accordance with the value of the ratio and the motor speed detected by the motor speed detecting means. will be.

Further, according to claim 12, it is possible to provide an air conditioner which is inexpensive, satisfies the power supply harmonic current regulation, and has a high capacity and an efficient use of the power supply capacity to the maximum.

According to the invention as set forth in claim 1, while the power circuit harmonic current is suppressed by an inexpensive circuit configuration, high efficiency and proper power factor are realized at low load, and high power factor and appropriate efficiency are realized at high load.

According to claim 2, the low-load circuit realizes high efficiency and proper power factor while suppressing the power supply harmonic current in an inexpensive circuit configuration, and realizes high power factor and appropriate efficiency at high load.

According to claim 3, the power supply harmonic current regulation is satisfied while increasing the number of short circuits to improve the power factor.

According to claim 4, in order to suppress the power supply harmonic current and to improve the power factor, even if the number of short circuits is increased, the DC voltage hardly changes, and stable operation of the device under load can be ensured.

According to claim 5, in order to suppress the power supply harmonic current and to improve the power factor, even if the number of short circuits is increased, the DC voltage hardly changes, and stable operation of the device under load can be ensured.

According to claim 6, in order to suppress the power supply harmonic current and to improve the power factor, even if the number of short circuits is increased, the DC voltage hardly changes, and stable operation of the device under load can be ensured.

According to the seventh aspect, in order to suppress the power source harmonic current and to improve the power factor, even if the number of short circuits is increased, the DC voltage hardly changes, and stable operation of the device under load can be ensured.

According to claim 8, a low cost circuit structure suppresses the power supply harmonic current, while achieving high efficiency and proper power factor at low load, and high power factor and appropriate efficiency at high load.

According to the ninth aspect of the present invention, a high-power efficiency and an appropriate power factor are realized at a low load, and a high power factor and an appropriate efficiency are realized at a high load while suppressing the power supply harmonic current with a cheap circuit configuration.

According to claim 10, a low cost circuit structure suppresses the power supply harmonic current, and at high loads, high efficiency and proper power factor are realized, and at high loads, high power factor and appropriate efficiency are realized.

According to the eleventh aspect of the present invention, while the power circuit harmonic current is suppressed in a cheap circuit configuration, high efficiency and proper power factor are realized at low load, and high power factor and appropriate efficiency are realized at high load.

According to the twelfth aspect, an air conditioner which is inexpensive, satisfies the power supply harmonic current regulation, and utilizes the power supply capacity to the maximum, and is efficient.

1 is a block diagram showing a circuit configuration of a power supply device of Embodiment 1;
Fig. 2 is a diagram showing power supply voltage and input current waveforms at the time of one short circuit in the same power supply device.
Fig. 3 is a diagram showing power supply voltage and input current waveforms at two short-circuits in the same power supply device.
Fig. 4 is a diagram showing power supply voltage and input current waveforms at three short circuits in the same power supply device.
Fig. 5 is a diagram showing power supply voltage and input current waveforms at five short circuits in the same power supply device.
Fig. 6 is an explanatory diagram of the storage contents of the memory device of the short circuit count control unit of the power supply device;
7 is a main part of a short circuit count control flow of the short circuit count control unit;
8 is an essential part of a shearing process flow of the short circuit count control unit;
9 is an essential part of a short circuit count increasing processing flow of the short circuit count control unit;
10 is a main part of a short circuit count reduction processing flow of the short circuit count control section.
11 is a block diagram showing a circuit configuration of the power supply apparatus.
12 is a diagram illustrating a relationship between an input current and a target direct current voltage.
13 is a diagram illustrating a relationship between a load amount and a target DC voltage.
14 is a diagram illustrating a relationship between a motor applied voltage and a target direct current voltage.
15 is a diagram illustrating a relationship between a motor rotation speed and a target direct current voltage.
Fig. 16 is a block diagram showing the circuit construction of the power supply device of the third embodiment.
Fig. 17 is a block diagram showing the circuit construction of the power supply device of the fourth embodiment.
Fig. 18 is a block diagram showing the circuit construction of the power supply device of Example 5;
19 is a configuration diagram of an air conditioner of a sixth embodiment;
20 is a perspective view of the internal structure of an outdoor unit of the air conditioner.
Fig. 21 is a plan view of the top plate removed from the outdoor unit;
The front view which removed the front plate of the outdoor unit.

EMBODIMENT OF THE INVENTION Hereinafter, the Example which applied this invention to the DC power supply device for the compressor drive of an air conditioner is demonstrated using drawing. The same reference numerals in the drawings represent the same or equivalent.

Example 1

First, the whole structure of the DC power supply device of this invention is demonstrated using FIG. Fig. 1 is a block diagram showing the circuit configuration of the power supply device of the first embodiment.

As illustrated in FIG. 1, the DC power supply device 100 is connected to the AC power supply 101 and the load 104, rectifies the AC voltage by the rectifier circuit 102, and smoothes the DC power supply by smoothing the capacitor 103. Convert to voltage and power the load 104.

Usually, because of the direct current voltage caused by the charge accumulated in the smoothing capacitor 103, no current flows only when the alternating current voltage exceeds this direct current voltage, so that the energization section is short, the current waveform is sharp and sharp, and the power factor becomes poor. In order to improve this, when the reactor 105 is connected, the peak value of the current waveform is lowered, the energization section is extended backward, and the power factor is improved.

Moreover, the switching means 106 is provided so that the AC power supply 101 may short-circuit through the reactor 105, and the zero cross detection means 107 which detects the zero cross point of the AC power supply 101 is connected, In synchronism with the zero cross point detected by the zero cross detection means 107, the switching control means 108 generates a drive signal for driving the switching means 106, and shorts the switching means 106.

Next, the example of the 1st short circuit and the 2nd short circuit of a switching means is demonstrated using FIG. 2, FIG. Fig. 2 is a waveform of power supply voltage and input current during one short circuit in the power supply device. 3 is a waveform of power supply voltage and input current during two short circuits in the power supply device.

In order to suppress the power supply harmonic current, it has been said that it is effective because the short circuit current peaks when the short circuit of switching and opening of a plurality of times are reduced, but this interval is not mentioned. As a result of repeated studies, the inventors have found that the opening time between the first and second short circuits is important for achieving both an improvement in power factor and suppression of power supply harmonic currents, and the present invention has been filed. The importance of the opening time between the first and second paragraphs is explained below.

Prior to the explanation, the harmonic margin as an index of the harmonic current will be described. The limit value of the harmonic current of the nth order of a power supply frequency is prescribed | regulated to JIS C61000-3-2 "Electronic compatibility-Part 3-2: Limit value-Harmonic current generation limit value", and the harmonic current with respect to this limit value Isn N is defined as (1-In / Isn).

As is clear from the definition, when the nth degree of margin is less than 0, n harmonic current of the nth order or more above the limit value Isn flows, resulting in NG due to non-regulation, and when the nth degree of margin is larger than 0, the nth order When the harmonic current of is less than the limit value, it is in compliance with the regulations. When the nth order margin is close to 1, the nth harmonic current is close to 0, and there is almost no nth harmonic current that adversely affects the power supply. It can be said to be a favorable state.

The margin of n-th order is calculated from 2nd to 40th order and the smallest is defined as the harmonic margin.

In general, when considering a product of household 4-5㎾ class as an air conditioner, 200V is often used as a power source, and the driving time is most often used for weak heating during the cold and cold spring and autumn. The conditions with the greatest load are when the compressor is driven at a high speed during the early morning heating, and the room is rapidly warmed with a large heating capacity.

In this way, the heating capacity and the cooling capacity are linked to the magnitude of the load and the air conditioner is operated according to the compressor rotation speed, the DC voltage, the input current, the temperature of each gas part, the temperature of the refrigeration cycle, and the like. Is required.

The case where only one paragraph is initially performed is demonstrated. In this case, the waveform of the power supply voltage and power supply current (input current) of the power supply half cycle is as shown in FIG. 2, for example. It is assumed that the AC power supply voltage is 200 V and 50 mA, and the load condition is assumed to be 260 V of DC voltage Vd and output power of 880 W, which corresponds to a weak operation of heating with a long operation time, and a delay from the first cross to zero cross. When the time is Td, the short time is Ton, the required DC voltage 260V is obtained, the delay time Td and the short time Ton are obtained, the maximum power factor is obtained, and the margin and power factor of harmonics at that time are obtained by simulation. Becomes

As can be seen from this table, the margin of harmonics can be improved by changing the delay time and the short time. In Table 1, when the margin of harmonics increases, the power factor tends to decrease, and the margin and power factor of the harmonics are in a trade-off relationship.

Next, various examples of two specific paragraphs will be described.

On the other hand, when two short circuits are performed, waveforms of the power supply voltage and power supply current (input current) of the power supply half cycle are as shown in FIG. 3, for example.

Total short-circuit time Ton which sums delay time Td from zero cross to the 1st short circuit 1.7 times and the 1st and 2nd short-circuit time with DC voltage Vd as 260V, output power as 880W, AC power supply voltage 200V, and 50 mA. Is fixed at 0.62 ㎳, the second short time is changed to 0.1 to 0.5 ㎳, and the margin of harmonics when the open time between the first and second short is changed to 0.1 to 0.8 ㎳ is shown in Table 2, The power factor is shown in Table 3.

Even if the circuit is shorted twice so as to have a DC voltage of 260 V and a high power factor is obtained, if the opening time between the first and second short circuits is taken too large, the margin of harmonics becomes NG. The harmonic margin and power factor are good, and the margin of change in control is when the opening time between the first and second short circuits is 0.2 ms, and the harmonic margin is 0.08 to 0.18 even if the second short time is changed. The power factor is 93.2 to 93.9% and high power factor can be realized within the standard value of harmonics.

In addition, the total short time Ton, which is the sum of the delay time Td from the zero cross to the first paragraph and the first and second short time, is expressed as (Td, Ton) = (2.2 ms, 0.45 ms), (2.7 ms, 0.35 ms). The margin and power factor of the harmonics in one case are shown in Tables 4 to 7. In addition, the following table is a value in the case of a power supply voltage of 200V and a power supply frequency of 50 Hz, unless there is particular notice.

When (Td, Ton) = (2.2㎳, 0.45㎳), the opening time between the first and second paragraphs is preferably 0.2 to 0.4㎳, and the harmonic margin at this time is 0.08 to 0.31 and the power factor is It becomes 90.7 to 92.5%. Although there was no room for harmonics in only one short-circuit, the short-circuit was performed twice and the opening time between the first and second short circuits was selected from 0.2 to 0.4 ms, so that the margin of harmonics can be improved at the same power factor. have.

Even when (Td, Ton) = (2.7 ㎳, 0.35 ㎳), good results are obtained when the opening time between the first and second short circuits is 0.2 to 0.4 ms, and the margin of harmonics is 0.16 to 0.37, power factor. Is 86.8 to 89.5%. By performing two short circuits rather than a single short circuit and selecting an opening time between the first and second short circuits between 0.2 to 0.4 ms, the margin of harmonics can be improved at the same power factor.

Under the above conditions, when the number of windings of the motor to be used is increased, the output DC voltage is required to be increased. However, in order to examine whether the technique of the present invention can be used in such a situation, the DC voltage is set to 270V. The change was examined. In this case, the total short-circuit time Ton that adds the first and second short-circuit times needs to be longer than when the DC voltage is 260 V, and the delay time Td and the short-circuit time Ton at which the power factor is maximized are (Td, Ton). = (1.7 ㎳, 0.74 ㎳), (2.2 ㎳, 0.56 ㎳), (2.7 ㎳, 0.44 ㎳). The margin and power factor of the harmonics in the case of the 1st short circuit are shown in Table 8, and the margin and power factor of the harmonics in the 2nd short circuit are shown in Tables 9-14.

In the case of (Td, Ton) = (1.7㎳, 0.74㎳), the power factor is 90.8% and harmonic margin is -0.08 in one short circuit, but the harmonic margin is NG. When the opening time between the first and second short circuits is 0.2 ms, the margin of harmonics and power factor are good, and there is a margin against control fluctuations, and the margin of harmonics is 0.03 to 0.16 even if the second short circuit time is changed. The high power factor is 91.5 to 93.3% and within the standard value of harmonics.

In the case of (Td, Ton) = (2.2 ㎳, 0.56 ㎳), the power factor is 91.0% and the harmonic margin is 0.09 in only one short circuit, and there is little margin relative to the standard value of harmonics. When the opening time between the second and second short circuits is 0.2 ms, the harmonic margin and power factor are good, and there is a margin against control fluctuations. Even if the second short circuit time is changed, the harmonic margin is 0.13 to 0.28, and the power factor is The high power factor can be realized within 91.0 to 91.5% of the harmonic standard value.

In the case of (Td, Ton) = (2.7 ㎳, 0.44 ㎳), the power factor is 89.6% and the harmonic margin is -0.09 and the harmonic margin is NG. When the opening time between the 1st and 2nd short circuits is 0.2 to 0.4 여유, the harmonics margin and power factor are good, and there is room for control fluctuations, and the harmonics margin is 0.05 to 0.26 even if the second short circuit time is changed. The power factor is 87.7 ~ 89.3% and high power factor can be realized within the standard value of harmonic.

Next, when it is necessary to rotate the compressor at high speed as in the case of the heating rise of the air conditioner, it is necessary to increase the DC voltage in order to increase the number of revolutions of the motor, and the temperature of the warm air blown out of the air conditioner. When you raise, it becomes a heavy load and you have to increase the output.

For this reason, AC power supply voltage of 200V, 50 kV, DC voltage Vd was examined at 280V, and output power at 1800W. In this case, it is necessary to further increase the total short-circuit time Ton obtained by adding the first and second short-circuit times, and the delay time Td and the short-circuit time Ton at which the power factor is maximized are (Td, Ton) = (1.5 ms, 1.24 ms). ). In Table 15, the margin and power factor of harmonics in one short circuit are changed to 0.1 to 0.9 ms in the second short circuit in the second paragraph, and the open time between the first and second short circuits is 0.1 to 1.0 ms. Table 16 and Table 17 show the margins and power factor of the harmonics in the case of changing to.

In (Td, Ton) = (1.5 ㎳, 1.24 ㎳), the power factor is 93.6% and harmonic margin is 0.16 in only one short circuit, and it is a high power factor within the harmonic standard value. Good results are obtained when the opening time between the short circuits is 0.2 to 0.4 ms. Even if the second short circuit time is changed, the harmonic margin is 0.09 to 0.33 and the power factor is 93.5 to 94.7%. By performing two short circuits rather than a single short circuit and selecting an opening time between the first and second short circuits between 0.2 to 0.4 ms, the margin of harmonics can be made large and the power factor can be increased.

Next, in order to examine versatility, such as when the number of windings of the motor used is increased from the above conditions, the DC voltage is further increased, the AC power supply voltage 200V, 50 kV, the DC voltage Vd is 300V, and the output power is 1800W. Reviewed. In this case, it is necessary to further lengthen the total short-circuit time Ton obtained by adding up the first and second short-circuit times, and the delay time Td and the short-circuit time Ton at which the power factor is maximized are (1.5 ms, 1.44 ms). In Table 15, the margin and power factor of harmonics in one short circuit are changed to 0.1 to 0.9 ms in the second short circuit in the second paragraph, and the opening time between the first and second short circuits is 0.1 to 0.9 ms. The margin of harmonics and the power factor in the case of changing to the above are shown in Tables 18 and 19.

In the case of (Td, Ton) = (1.5 ㎳, 1.44 ㎳), the power factor is 89.3% and harmonic margin 0.34 in only one short circuit, and it is high power factor within the standard value of harmonics. Good results are obtained when the opening time between the second and second short circuits is 0.2 to 0.3 ms. Even if the second short circuit time is changed, the margin of harmonics is 0.10 to 0.42 and the power factor is 89.6 to 99.1%. By performing two short circuits rather than a single short circuit and selecting an opening time between the first short circuit and the second short circuit from 0.2 to 0.3 ms, the margin of harmonics can be made large and the power factor can be increased.

As described above, in order to make both the suppression of the power supply harmonic current and the high power factor compatible, it is better to short-circuit twice than to short-circuit the switching means 106 once. It is preferable to select the opening time of the switching means 106 between the second short circuits from 0.2 to 0.4 ms. In the case of 60 ms, this opening time is preferably selected from 0.16 to 0.33 ms, which is about 5/6 when 50 ms.

As shown in FIG. 3, after the delay time from the zero cross detected by the zero cross detection means 107 as shown in FIG. 3, the switching control means 108 turns on the switching means 106 to reset the DC power supply. One short-circuit is performed, the switching means 106 is opened by an interval of 0.3 kV when the AC power supply 101 is 50 kV, and 0.25 kV when 60 kV, and then the switching means 106 is turned on to turn on the second short circuit. After that, the switching means 106 is opened.

The opening time between the first paragraph and the second paragraph needs to be selected between 0.2 to 0.4 ms for 50 ms and 0.16 to 0.33 ms for 60 ms, but may be changed depending on the situation.

Next, the determination method of a 1st short time and a 2nd short time is demonstrated.

(a) For example, the second short circuit time is fixed to 0.1 ms, and the first short circuit time is determined by detecting the average of the DC voltages between the multiple cycles of AC as the current DC voltage and performing PI control with a difference from the target DC voltage. do.

(b) As another method, the ratio of the first and second short-circuit times may be determined, the current DC voltage may be detected with respect to the sum of the first and second short-circuit times, and PI control may be performed with a difference from the target DC voltage.

(c) As another method, the current DC voltage is detected for the sum of the first and second short-circuit times, PI control is performed with a difference from the target DC voltage, and the first short-circuit time is given an arbitrary limit value. If the short time exceeds the limit, the second short time may be extended. The limit value may also be changed by input current, load information, target DC voltage, current DC voltage, and the like.

The determination of whether the frequency of the AC power supply 101 is 50 Hz or 60 Hz is performed by measuring the interval of the zero cross signal, for example, 50 Hz when it is longer than 9 Hz, and 60 Hz when it is shorter than 9 Hz.

In addition, the case where the switching means is short-circuited more than twice is demonstrated using FIG. 4, FIG. 4 shows power supply voltage and input current waveforms at three short-circuits in the power supply device. Fig. 5 shows power supply voltage and input current waveforms at five short circuits in the power supply device.

As described above, the power factor can be improved by suppressing harmonics by shorting the switching means 106 twice. Further, when the harmonic current is further suppressed and the power factor is increased, it is effective to increase the number of short circuits. Increasing the number of shorts increases the loss.

Next, the case of shorting three times is demonstrated.

After 1.5 ms delay time from the zero cross detected by the zero cross detection means 107 as shown in FIG. 4, the switching control means 108 turns on the switching means 106 to perform a first short circuit and switches by 0.2 ms. (106) is turned off, the switching means 106 is then turned on to perform a second short circuit, then the switching means 106 is turned off, and then the switching means 106 is turned off at a time of 4.0 kV from the zero cross. On, a third short circuit is performed, and then the switching means 106 is opened.

The opening time between the first paragraph and the second paragraph needs to be selected between 0.2 to 0.4 ms for 50 ms and 0.16 to 0.33 ms for 60 ms, but if it is within this range, it may be changed according to the surrounding situation. The opening time between the second and third paragraphs may be a fixed value or may vary.

The determination method of the 1st short time, the 2nd short time, and the 3rd short time is demonstrated.

(d) For example, the second short circuit time and the third short circuit time are fixed at 0.1 ms, and the first short circuit time is determined by detecting the current direct current voltage and performing PI control with a difference from the target direct current voltage.

(e) As another method, the third short circuit time is fixed at 0.1 ms, and the first and second short circuit times are determined by detecting the current DC voltage and performing PI control with a difference from the target DC voltage. You may carry out by the determination method of the short circuit time of (c).

(f) As another method, the ratio of the first, second, and third short circuit times is determined, the current DC voltage is detected with respect to the sum of the first, second, and third short circuit times, and PI control is performed by the difference from the target DC voltage. You may carry out.

(g) As another method, the current DC voltage is detected for the sum of the first, second, and third short-circuit times, and PI control is performed with a difference from the target DC voltage, and an arbitrary limit value is applied to the first and second short-circuit times. The second short circuit time may be extended if the first short circuit time exceeds the limit value, and the third short circuit may be extended if the second short circuit time exceeds the limit value. The limit value may also be changed by input current, load information, target voltage, current voltage and the like.

In the above embodiment, when the number of short circuits is five times, two, three, four, and five times are finely switched in multiple stages. For example, even in the case of two stages of switching from two to five short circuits, do.

In addition, the case where five times of paragraphs are performed by increasing the number of paragraphs will be described. The determination method of the short circuit time of (a)-(c) mentioned above is performed until the 2nd paragraph.

In the case of 50 mV, the third short circuit is performed 0.1 m after 4 m from the zero cross, the fourth short is 6 mV, and the fifth short is 0.1 m after 7 mV. 5 shows the voltage and current waveforms of the AC power supply 101. In the case of 60 Hz, the third short circuit is performed 0.13 ms after 3.32 ms from the zero cross, and the fourth short circuit is 0.1 ms after 5 ms, and the fifth short circuit is 5.8 ms after 5.8 ms.

Here, the short-circuit time at the 3rd, 4th, and 5th times is 0.1 ms, but if the time is shorter than 0.2 ms in the case of 50 ms, it may be longer. You may change short circuit time, respectively. It may also be changed by input current, load information, target voltage, current voltage and the like.

Next, a method of changing the number of short circuits in accordance with the ratio between the power supply voltage and the target DC voltage is described.

The air conditioner is required to operate with the ability according to the surrounding situation, the magnitude of this capacity is interlocked with the magnitude of the load received by the air conditioner, and the magnitude of the load is the compressor that the DC power supply supplies power to. It changes according to the surrounding information, such as the number of revolutions, the output DC voltage of the DC power supply, the AC input current of the DC power supply, the temperature of each part of the air conditioner, and the temperature of the refrigeration cycle.

In Fig. 1, the target voltage setting means 111h sets the target DC voltage Vg in accordance with these peripheral information detected by the peripheral information detecting means 118, and transfers it to the converter control means 111f. In this case, the input power supply voltage Vs (peak value) is detected, and the value of the ratio with the target DC voltage Vg (average value) is taken as the boost ratio R, and this boost ratio R = Vg / Vs is calculated.

The converter control means 111f is built in the microcomputer 111, and receives the signal of the power supply voltage and zero cross detection means 107, the A / D converter 111b, the frequency detection means 111a, or the inverter control means ( 111g) and a signal to the switching control means 108 via the PWM output part 111c based on the information from the target voltage setting means 111h, and the switching control means 108 switches the switching means 106 based on the signal. ).

If the boost ratio is 1 or more, the number of short circuits is 6 times, and if the boost ratio is less than 1, the number of short circuits is 2 to 5 times. In this case, the number of short circuits may be switched by skipping the number of short circuits such as 2⇔6, 3⇔6, and 5⇔6, or may be switched sequentially. The examples shown in Tables 2 to 7, 7, 9, 14, 16, and 17 described above are data for the case where the boost ratio is less than 1 and two short circuits, and the examples in Table 18 and Table 19 have the boost ratio of 1 or more. Data for the case of two paragraphs.

In addition, although the booster was less than 1 at the start of operation, when it changed during operation and became 1 or more, or when it is 1 or more from the beginning, it will become operation with the frequency | count of 3 or more short circuits, but also in this case, the 1st and 2nd short circuit intervals In the same manner as described above, good results can be obtained by setting 0.2 to 0.4 kHz when the power supply frequency is 50 kHz and 0.16 to 0.33 kHz when the power supply frequency is 60 kHz.

As described above, in the embodiment, when the value of the ratio between the target DC voltage set by the target voltage setting means and the power supply voltage detected by the power supply voltage detecting means is equal to or greater than a predetermined value, the number of short circuits of the switching means Depending on the value, the number of switching is greater than two times and the number of short circuits in which the noise frequency of the DC power supply device is not exceeded with respect to the operating noise frequency of the motor of the built-in equipment.

As described above, the DC power supply of the embodiment includes a rectifier circuit for converting AC power input from an AC power source into DC power, a reactor connected between the AC power source and the rectifier circuit, and short-circuit the AC power source through the reactor. Switching means, target voltage setting means for the DC power, frequency detecting means for detecting a frequency of the AC power supply, power supply voltage detecting means for detecting a power supply voltage of the AC power supply, and a zero cross point of the AC power supply. And a zero cross detection means for detecting a voltage, a DC voltage detection means for detecting a DC voltage as an output of the rectifier circuit, and switching control means for shorting and opening the switching means in synchronization with the zero cross point. The control means is a target DC voltage and the power supply voltage set by the target voltage setting means. When the value of the ratio with the power supply voltage detected by the detection means is less than a predetermined value, the switching means is short-circuited twice in a half period from the zero cross point of the AC power supply detected by the zero cross detection means. The first and second short circuit intervals of the second short circuit are 0.2 to 0.4 kHz when the power supply frequency detected by the frequency detecting means is 50 kHz, and 0.16 to 0.33 GHz when the power supply frequency is 60 kHz. After that, when the value of the ratio is equal to or greater than a predetermined value, the number of short circuits of the switching means is increased more than the number of times according to the value of the ratio, and the DC power supply with respect to the operating noise frequency of the motor of the built-in apparatus. Switch to the number of short circuits in which the noise frequency of the device is not exceeded.

In general, when the AC power is converted from the rectifier circuit to the DC power source to drive a load, a reactor is installed between the AC power source and the rectifier circuit, and a short circuit element for shorting the AC power source through the reactor is installed in parallel with the rectifier circuit. In order to improve the power factor, the short-circuit element is operated for an appropriate time at an appropriate time based on the zero cross point of the AC power supply.

This improves the power factor, reduces the facility burden on the supplier of the AC power supply, utilizes the capacity of the breaker to connect the device or the power outlet to the maximum, thereby maximizing the capability of the device, thereby substantially reducing the user's cost performance. Because it can make good. However, it is not necessary to short-circuit blindly, and the power supply harmonic current may increase due to the short circuit method or the load condition.

The short circuit frequency of the short circuit element performed to improve the above-mentioned power factor and suppress the power supply harmonic current has the above-mentioned effect in two short circuits than in one short circuit, and increases the short circuit frequency, thereby satisfying the regulation of the power harmonic current. It is possible to further increase the power factor.

Ideally, in order to reduce the power supply harmonic current, the switching of the short circuiting element should be performed at a high frequency, and the power supply current should be changed almost in synchronization with the instantaneous value of the power supply voltage, and also proportionally changed. As a device having a high-speed response, a device that can be used at high speed usually needs to be used. In addition, the switching loss of the shorting element is increased, and the temperature rise of the shorting element is increased.

In order to overcome this, inevitably, expensive heat-resistant parts, including peripheral parts, are used. Therefore, the cost increase is inevitable, and since the loss is large, the breaker connecting the device, Or even if the capacity of the outlet is utilized to the maximum, the power that can be supplied to the load is not necessarily the maximum.

In addition, when the air conditioner is assumed as a load, the air conditioner responds to the user's comfort needs quickly by controlling the air with a large capacity at the beginning of operation. It is necessary to drive continuously with small power so as not to be offended. For this reason, it is required to make the rotation speed of a compressor variable and to be able to cope with the wide load fluctuations from a large capacity to a small capacity.

Moreover, when employ | adopting the rectifier circuit mentioned above, the design which avoids the fluctuation | variation of a direct current voltage by the fluctuation of a power supply voltage is also required.

In the DC power supply device of the embodiment, the DC voltage optimal for driving the load is set by the target voltage setting means, and the value of the ratio to the effective value of the power supply voltage is less than the predetermined value, that is, the load is light and the In operation, the power factor can be increased while the power supply harmonic current is suppressed by shorting the circuit twice at an appropriate short circuit interval according to the power source frequency. At this time, since the number of switching is only two, the switching loss is small and efficient operation can be performed.

In addition, when the value of the ratio between the target voltage and the effective value of the power supply voltage is equal to or greater than a predetermined value, that is, when the load is heavy and operating at high capacity, the power supply harmonic current is monotonously increased by monotonically increasing the number of short circuits up to six times. It is possible to cover the fluctuation of the power supply voltage while keeping the voltage below the regulated value, and to make the boost of the DC voltage and the up of the power factor compatible. At this time, since the number of switching is at most six times, the switching loss also ends up slightly and high efficiency can be maintained.

In this case, the second short circuit focuses on increasing the power factor and suppressing the power supply harmonic current, and the third short circuit focuses on the DC voltage boost, and the fourth short circuit increases the DC voltage boost and power factor. In the fifth and sixth paragraphs, the short circuit operation is performed mainly by increasing the power factor.

In particular, in the case where the load to be driven is a compressor of the air conditioner, the air conditioner loses switching because the operation in a condition where the room temperature is close to the set temperature (low speed of the compressor and continuous operation at a small capacity) is very long. This small and efficient operation is continued for a long time, and the amount of power consumption can be suppressed.

In addition, at the time of high load such as the beginning of the air conditioning operation, the number of switching is increased, so that the compression motor overcomes the induced voltage, rotates at high speed, and boosts the DC voltage so that the compressor exhibits a large capacity. By utilizing the capacity of the breaker connected to the air conditioner or the outlet or the outlet, the capacity of the air conditioner can be maximized to maximize the capacity of the air conditioner.

For this reason, the DC power supply which realizes high efficiency and suitable power factor at low load, and high power factor and moderate efficiency at high load can be provided, suppressing power supply harmonic current by a cheap circuit structure.

In addition, in the above, in order to demonstrate concretely, although the air conditioner of inverter control was mentioned as an example as a load, this invention is not limited to the DC power supply for the air conditioner of inverter control, and it is the same if it is a DC power supply of the same structure. Of course, the effect can be obtained.

Further, in the DC power supply apparatus of the embodiment, the switching control means may be configured such that when the value of the ratio between the target DC voltage set by the target voltage setting means and the power supply voltage detected by the power supply voltage detection means is equal to or greater than a predetermined value, As in the case of the second short circuit, the switching means are short-circuited twice in a half cycle from the zero cross point of the AC power source detected by the zero cross detection means, and the first and second of the two short circuits are performed. The first short circuit interval is 0.2 to 0.4 kHz when the power supply frequency detected by the frequency detecting means is 50 kHz, and 0.16 to 0.33 kHz when the power supply frequency is 60 kHz, after which the value of the ratio is predetermined. When the value is greater than or equal to the value, the number of short circuits of the switching means is made more than two times according to the value of the ratio, and with respect to the operating noise frequency of the motor of the built-in device. Switch to the number of short circuits in which the noise frequency of the DC power supply is not exceeded.

As a result, even in the case of shorting the number of times exceeding 2, by setting the appropriate interval between the first short circuit and the second short circuit in the same manner as described above, the suppression of the power supply harmonic current and the improvement of the power factor can be achieved.

For this reason, the DC power supply which realizes high efficiency and suitable power factor at low load, and high power factor and moderate efficiency at high load can be provided, suppressing power supply harmonic current by a cheap circuit structure.

In the DC power supply device of the embodiment, the switching control means sets the short-circuit time after the third time to be 0.25 kHz or less when the power supply frequency is 50 kHz, or 0.2 kHz or less when the 60 kHz power is applied.

As a result, the frequency of the power supply harmonic current generated by the short circuit after the third time becomes 2,000 kHz or higher when the power supply frequency is 50 kHz, or 2,500 kHz or higher when the power supply frequency is 50 kHz, and becomes 40 or more times of the power supply frequency. Since it is excluded from the regulation, it is possible to satisfy the power supply harmonic current regulation, and it is only necessary to consider the improvement in power factor.

In order to suppress the harmonic current and to increase the power factor, it has been described above that it is effective to increase the number of short circuits, but according to the simulation, it is effective to increase the number of short circuits for suppressing the 3rd to 15th harmonics related to the power factor. However, the harmonic currents of the 15th to 40th order tend to increase on the contrary.

Therefore, it has been found that the short circuit after the second short circuit has a higher order waveform than the 40th order, which is important for suppressing the power supply harmonic current. When the power supply frequency is 50 kHz, the sine wave of the period 20 kHz and the period of the 40th harmonic of the power supply frequency are 0.5 kHz.

When the triangular wave generated by the short circuit becomes less than 1/2 of the period of the 40th order, the power supply harmonic current regulation becomes out of the target and the power supply harmonic current regulation can be satisfied by shortening the short circuit time to 0.25 ㎳. Similarly, when the power supply frequency is 60 Hz, the short circuit time is shorter than 0.2 Hz to satisfy the power supply harmonic current regulation.

For this reason, the DC power supply which satisfy | fills the power supply harmonic current regulation can be provided, improving the power factor by increasing the number of short circuits.

Next, the control at the time of switching a short circuit frequency is demonstrated using the half cycle of AC power supply as an example using FIGS. 6-9. 6 is an explanatory view of the storage contents of the memory device of the short-circuit control unit of the power supply device. 7 is an essential part of a short circuit count control flow of the short circuit count control unit.

A memory device is built into the converter control means 111f, and the memory device stores the threshold value of the boost ratio so that the set number of times of short circuit N according to the boost ratio R can be selected. The threshold value of the boost ratio is different from when the number of short circuits increases and decreases, so that appropriate hysteresis is provided so that the control is stabilized.

As shown in Fig. 6, the storage device sets the number of times of short circuit N according to the boosting ratio R, and the upper limit TuNn and the lower limit TlNn of the short time at the time of the nth short circuit according to the set number of short circuits N and the actual number of short circuits M. The control allowable width ΔVM of the target DC voltage Vg according to the number of short circuits is stored in this storage device.

When the operation of the DC power supply device 100 is started in step S1 of FIG. 7, first, in step S3, the front end process of obtaining data required for various judgments and calculations is performed, and the flow proceeds to step S20, where the DC output voltage Vd and If the upper limit value Vgu of the target DC voltage is compared, and if the DC output voltage Vd is less than or equal to the upper limit Vgu of the target DC voltage, the process proceeds to step S21. If the DC output voltage Vd exceeds the upper limit value Vgu of the target DC voltage, the process proceeds to step S26.

In step S21, the DC output voltage Vd is compared with the target DC voltage Vg. When the DC output voltage Vd is less than the target DC voltage Vg, the flow proceeds to step S25. When the DC output voltage Vd is the target DC voltage Vg or more, the DC output is output. Since the voltage Vd is within the range of an appropriate value, the control of the phenomenon can be continued. The flow proceeds to step S65 to perform a short circuit at the current short time, and to proceed to step S80 to terminate the short circuit operation in the half cycle of the AC power supply.

In step S25, the actual number of paragraphs M in the previous half cycle is compared with the set number of paragraphs N. If the actual number of short circuits M is less than the set number of paragraphs N, the flow advances to step S40 to increase the number of short circuits by one, to increase the number of short circuits in each meeting. The short-circuit count increasing process to be reset is performed, and the flow proceeds to step S60, and the short-circuit operation is performed at the reset short-circuit time T'a1 to M + 1st short-circuit time T'aMp, and the flow proceeds to step S80 to short-circuit operation. To exit.

If the actual number of paragraphs M is greater than or equal to the set number of paragraphs N in step S25, the flow advances to step S30 to store the upper limit value TuMM of the short-circuit time of the first short-circuit time TuM1 to the M-th (last time) with respect to the actual short-circuit number M; The short-circuit upper limit sum ΣTuMn is read from the calculation, and the short-circuit time sum ΣTan which is the sum of the short-circuit time TaM of the first short-circuit time Ta1 to M-times (final time) in the previous half cycle is calculated and compared.

In the case where the short-circuit time upper limit sum ΣTuMn is less than or equal to the short-circuit time sum ΣTan in step S30, the short circuit time cannot be lengthened longer in the number of M short circuits. Therefore, the flow proceeds to step S40 to increase the number of short circuits once. The number of times increasing process is performed, and step S80 is reached through step S60 to terminate the short circuit operation.

In step S30, if the sum of the short-circuit time upper limit ΣTuMn is larger than the sum of the short-circuit time ΣTan, there is a possibility that the short-circuit time is increased in the current M number of short-circuits. Proceeds to, PI control is performed with the difference between the target DC voltage Vg and the DC output voltage Vd to determine the short circuit time of this time.

In step S45, the short circuit time is determined by correcting the short circuit time in the last half cycle, and the corrected short circuit time T'aM of the first corrected short time T'a1 to M times (final time) is determined. Next, the flow advances to step S70 to perform a short circuit operation at the modified short time T'a1 to T'aM, and proceeds to step S80 to end the short circuit operation.

In step S26, the actual number of paragraphs M in the previous half cycle is compared with the set number of paragraphs N, and if the actual number of paragraphs M is greater than the set number of paragraphs N, the flow advances to step S50 to reduce the number of paragraphs by one to shorten each meeting. The short-circuit count reduction process to be reset is performed, and the flow proceeds to step S75 to perform the short-circuit operation at the reset short-circuit time T'a1 to M-1, the short-circuit time T'aMm, and to proceed to step S80 to short-circuit operation. To exit.

If the actual number of short-circuits M is less than or equal to the set short-circuit number N in step S26, the flow advances to step S35 to store the lower limit value TlM of the short-circuit time TlM1 to the M (final) short-circuit time for the actual short-circuit number M. The short-circuit time lower limit sum ΣTlMn is read from the calculation, and the short-circuit time total ΣTan of the short-circuit time TaM of the first short-circuit time Ta1 to M (final time) in the previous half cycle is calculated and compared.

If the short-circuit time lower limit sum ΣTlMn is greater than or equal to the short-circuit time sum ΣTan in step S35, the short-circuit time cannot be shortened to less than or equal to M number of short circuits. The short circuit count reduction process is performed, and a step S80 is reached through step S75, and the short circuit operation is completed.

In step S35, when the total short circuit time limit ΣTlMn is smaller than the total short circuit time ΣTan, there is a possibility that the short circuit time is shortened in the current M number of paragraphs, so that the short circuit meeting time in which the short circuit time does not reach the lower limit is shortened. Proceeds to, and performs PI control in the same manner as described above, determines the short-circuit time for this meeting, and reaches step S80 through step S70 to end the short-circuit operation.

Next, the shearing process of step S3 is demonstrated using FIG. 8 is an essential part of the front end flow of the short circuit count control unit.

The shearing process is started in step S101, the AC power supply voltage Vs and the target DC voltage Vg are read in step S105, the flow proceeds to step S110, the boost ratio R is calculated, the flow proceeds to step S111, and the setting according to the boost ratio R is performed. The number of paragraphs N is read from the storage device. In addition, the flow advances to step S112, the allowable width ΔVM of the target DC voltage is read from the storage device in accordance with the number of short circuits, and the flow proceeds to step S115 to calculate the upper limit value Vgu of the target DC voltage Vg.

Next, the flow advances to step S116, the DC output voltage Vd is read, the flow proceeds to step S120, and the actual short-circuit count M in the last half cycle is checked, and when the actual short-circuit count M is less than 2, the short-circuit operation is performed. It is assumed that the state is an initial state, and the value of M is assumed to be the set short-circuit number N so that the later control is not hindered, and the flow advances to step S130 to end the shearing process. When M is 2 or more in step S120, it progresses to step S130 as it is and complete | finishes a shearing process.

Next, the short circuit count increasing process of step S40 is demonstrated using FIG. 9 is an essential part of a short circuit count increasing process flow of the short circuit count control unit.

The short-circuit count increasing process is started in step S201. In step S202, the actual short-circuit number M of the previous half cycle is checked, and when M = 6, that is, the short-circuit number of the previous half cycle is six, the process proceeds to step S210, and FIG. Similarly to step S30, the short time sum total? And the short time upper limit sum? TuMn are compared. In this case, since M = 6, ΣTan and ΣTu6n are compared.

If the short-circuit time sum ΣTan in step S210 is equal to or larger than the short-circuit time upper limit sum ΣTu6n or more, the short-circuit time cannot be extended longer than 6M times, and further, the number of short-circuits is not set, and the flow proceeds to step S212. The current short circuit time is maintained, and the flow proceeds to step S265 to end the short circuit number increasing process.

In this case, the DC output voltage Vd may not reach the target DC voltage Vg, but the short-circuit time upper limit Tu6n is limited not only by the target DC voltage Vg but also by the magnitude of the power harmonic current or the temperature rise of the driving element. In some cases, it is necessary to consider carefully according to the type of load to be connected, the cooling method such as a drive element, and the ambient temperature conditions when setting the short time upper limit Tu6n.

In step S210, if the short-circuit time sum ΣTan is smaller than the short-circuit time upper limit sum ΣTu6n, there is a possibility that the short-circuit time may be lengthened in the current six times of paragraphs. Proceeds to, PI control is performed by the difference between the target DC voltage Vg and the DC output voltage Vd to determine the short circuit time of this time, and the short circuit count increasing process is terminated in step S265.

In the case of M = 5 in step S202, in order to increase the number of short circuits once and to 6 circuits, the flow advances to step S220 to call the lower limit value Tl66 of the sixth short circuit time in the case of six short circuits from the storage device, and the sixth time. The short time T'a6 is set. In this case, if the sixth short circuit is simply added to the five short circuits in the previous half cycle, the DC output voltage Vd may rise excessively, which may adversely affect the driving load.

As described above, when the DC output suddenly changes, in order to cope with such a sudden change, the short-circuit is shortened by increasing the immunity to the power supply of the connected load or switching the number of short circuits to control the connected load. It is inevitable that the countermeasures that lead to cost-up such as the introduction of a special control that operates only at the change of the number of times must be performed.

In order to avoid this phenomenon, it is effective to reduce the short circuit time of the short circuits other than the added short circuit so that the DC output voltage does not change suddenly even if the number of short circuits is increased. In the Example, the short-circuit time of the short-circuit meetings other than the added short-circuit meeting was shortened so that the total short-circuit time was almost the same before and after adding the short-circuit as a whole. Thereby, the change of DC output voltage became small before and after the addition of a short circuit, and the influence on a load was also made small.

In addition, in the embodiment, the short circuit time of the short circuits other than the additional short circuit is reduced in proportion to the short circuit times of the respective half cycles, so that not only the DC output voltage but also the power factor and power source harmonic currents change before and after the short circuit. As it becomes closer to a continuous change, the control of the connected load is eliminated the need for special control accompanying the change of the number of short circuits, and the necessary short circuit can be added at will, and the development speed of the product can be increased. Do.

Proceeding from step S220 to step S221, the remaining short time Tr6 is set as the total value of the time by which the sixth short circuit time T'a6 is subdivided proportionally to the respective short circuit times from the first to fifth short circuit times of the previous half cycle. Proceeding to step S222, the short-circuit time T'a5 of the fifth half of this half cycle is calculated and set by the following equation.

Next, the flow advances to step S223 to compare the set T'a5 to the fifth short time limit Tl65 of the sixth paragraph called from the storage device, and the set short time T'a5 calls from the storage device. If the lower limit value is Tl65 or more, the setting is made valid and the flow proceeds to step S228. If the set short time T'a5 is smaller than the short time limit lower limit value Tl65 called from the storage device, the flow proceeds to step S225 and the set short time T 'a5 is discarded and the short-circuit time lower limit value Tl65 called from the storage device is reset as the fifth short-circuit time T'a5 of this half cycle, and the flow proceeds to step S228.

In step S228, the remaining time Tr5 obtained by subtracting the correction amount Ta5-T'a5 at the setting of the fifth short time from the remaining time Tr6 is calculated by the following equation.

Next, the flow proceeds to step S232, and in order to subdivide the above-mentioned remaining remaining time Tr5 proportionally from each of the first to fourth short-circuit times to each of the short-circuit times, the fourth short-circuit time of this half cycle is expressed by the following equation. Compute and set T'a4.

Next, the flow advances to step S233, and the set T'a4 is compared with the fourth short-circuit time lower limit value TlMp4 of the Mp-time paragraph called from the storage device. Since Mp is the number of paragraphs in this half cycle, and the number of paragraphs in the previous half cycle is 5, Mp is added to this by adding the number of paragraphs once. Therefore, specifically re-reading step S233 is as follows.

The setting is valid when the set short time T'a4 is greater than or equal to the short time limit Tl64 called from the storage device, compared to the fourth short time limit Tl64 of the sixth paragraph called from the storage device. The process then proceeds to Step S238.

If the set short time T'a4 is smaller than the short time limit Tl64 called from the storage device, the flow advances to Step S235 to discard the set short time T'a4 and calls the short time limit Tl64 called from the storage device this time. The reset is performed as the short-circuit time T'a4 at the fourth half of the cycle, and the flow advances to step S238.

In step S238, the correction amount Ta4-T'a4 at the setting of the fourth shorting time is subtracted from the remaining remaining time Tr5 to be proportionally subtracted from the remaining 1 to 4th shorting time at the time of setting the fifth shorting time. One rest time Tr4 is calculated by the following equation.

In the following, similarly, equations 5 and 6 are used to calculate and set the third short time T'a3 and the remaining time remaining Tr3 in steps S242 to S248, and in steps S252 to S258 using equations 7, and 8. The second short time T'a2 and the remaining remaining time Tr2 are calculated and set, and in step S262, the formula 9 is used to calculate and set the first short time T'a1 of this half cycle, and proceeds to step S265. To end the short circuit count increasing process.

Returning to step S202, if the number of short circuits M in the previous half cycle is smaller than five, the process proceeds to step S205. In addition, when the number of short circuits M is greater than 3, that is, M = 4, the number of short circuits is 1; In order to increase the number of times to five times, the process proceeds to step S230, the lower limit value Tl55 of the fifth short-circuit time in the case of the fifth short-circuit is called from the storage device, the fifth short-circuit time T'a5 is set, and the flow proceeds to step S231. do.

In step S231, the fifth short time T'a5 must be subtracted proportionally from the first to fourth short time in the previous half cycle, in the calculation of the first to fourth short time set in the subsequent step. It calculates as the remainder remainder time Tr5 which is the sum total of time to perform, and it progresses to step S232. In this case, the remaining residual time Tr5 is the same as the fifth short-circuit time T'a5 set above.

After step S232, the control proceeds as described above, and the step number increasing process ends in step S265.

Next, returning to step S205, when the number of short circuits M in the previous half cycle is 3, the process proceeds to step S240 in order to increase the number of short circuits once and to four circuits. The lower limit value Tl44 is called from the storage device, set to the fourth short time T'a4, and the flow proceeds to step S241.

In step S241, the fourth short-circuit time T'a4 should be subtracted proportionally from the first-third short-circuit time in the previous half cycle among the calculations of the first to third short-circuit times set in subsequent steps. It calculates as the remainder remaining time Tr4 which is the sum total of time to perform, and it progresses to step S242. In this case, the remainder remaining time Tr4 is the same as the fourth short-circuit time T'a4 set above.

After step S242, control advances as mentioned above, and a short circuit count increase process is complete | finished in step S265.

If the number of shorts M in the previous half cycle is less than 3, the process returns to step S205. If the number of shorts M is larger than 1, that is, M = 2, the number of shorts is set. In order to increase the number of times to three times, the process proceeds to step S250, where the lower limit value Tl33 of the third short-circuit time in the case of the third short-circuit is called from the storage device, and the third short-circuit time T'a3 is set. Proceed.

In step S251, the third short time T'a3 must be subtracted proportionally from the first short second time in the previous half cycle among the calculations of the first to second short time set in the subsequent step. It calculates as the remainder remaining time Tr3 which is the sum total of time to perform, and it progresses to step S252. In this case, the remainder remaining time Tr3 is the same as the fourth short-circuit time T'a3 set above.

After step S252, the control proceeds as described above, and the step number increasing process ends in step S265.

Next, returning to step S208, if the number of short-circuits M in the previous half cycle is 1 or less, the flow advances to step S260 to call the lower limit value Tl22 of the second short-circuit time in the case of two short-circuits, and to call 2 It sets to the 1st short time T'a2 and advances to step S261.

In step S261, the lower limit value Tl21 of the first short-circuit time in the case of two short-circuits is called from the storage device, set to the first short-circuit time T'a1, and the flow proceeds to step S265 to end the short-circuit count increasing process.

As described above, in the DC power supply apparatus of the embodiment, when the number of short circuits of the switching means is increased from M times to M + 1, the total value of the short circuit time from the M time after the increase of the number of short circuits is increased to the short circuit time before the increase in the number of short circuits. Decrease the total value.

In general, when the short time is increased, the DC voltage obtained increases, and when the short time is short, the DC voltage obtained decreases. In addition, even when short-circuit time is divided into several circuits and short-circuited, it is known that the DC voltage obtained by simply adding a short circuit will rise, and the DC voltage obtained by simply reducing a short circuit will fall.

In the case of driving a load, the change in the DC voltage as the power source causes the driving state of the load to fluctuate, and the operation of the equipment under load deviates from the stable state, so that the stable operation of the apparatus under load is performed. Any modification must be made to return the driving state of the load to its original state, which is not preferable.

In the DC power supply of the embodiment, when the number of short circuits is increased from n to n + 1, the sum of the short circuit times up to n times after increasing the number of short circuits is increased so that the DC voltage is almost the same, rather than simply increasing the number of short circuits. The number of shorting times up to n times before increasing the number of shorts is made shorter. As a result, the DC voltage obtained by the short-circuit up to n times after increasing the number of short-circuits decreases, and recovers the DC voltage equivalent to the lowered level in the n + 1th short-circuit, and the direct current before increasing the short-circuit frequency as a whole. A DC voltage almost equal to the voltage can be obtained.

For this reason, in order to suppress the power supply harmonic current and to improve the power factor, even if the number of short circuits is increased, the DC voltage hardly changes, so that a DC power supply device capable of ensuring stable operation of a load-bearing device can be provided.

In the DC power supply of the embodiment, when the number of short circuits of the switching means is increased from M times to M + 1 times, the total value of the short time from M + 1 times to the M times before increasing the number of short circuits. It is equal to the total value of.

Generally, when dividing short time into several times and shorting, it is known that the DC voltage obtained will be substantially constant, if the sum total of short time is the same.

In the DC power supply device of the embodiment, when the number of short circuits is increased, the sum of the short circuit times is made equal. Thereby, the sum total of the short circuit time before and after increasing the number of short circuits becomes the same, and the DC voltage obtained can be kept substantially constant.

For this reason, in order to suppress the power supply harmonic current and to improve the power factor, even if the number of short circuits is increased, the DC voltage hardly changes, so that a DC power supply device capable of ensuring stable operation of a load-bearing device can be provided.

Next, the short-circuit frequency reduction process of step S50 is demonstrated using FIG. 10 is an essential part of a short circuit count reduction processing flow of the short circuit count control unit.

The short circuit count reduction process is started in step S301, and the actual short circuit count M of the previous half cycle is checked in step S302, and when M = 6, that is, if the short circuit number of the previous half cycle is 6, the short circuit count is reduced to 5 times and then performed. In order to proceed, the process proceeds to step S321. In this case, if the sixth short circuit is simply removed from the six short circuits in the previous half cycle, the DC output voltage Vd may drop excessively, which may adversely affect the driving load, leading to unexpected cost up.

In order to avoid this phenomenon, it is effective to reduce the short circuit time of short circuits other than the short circuits shortened so that the DC output voltage does not change suddenly even if the number of short circuits is reduced. In the Example, the short-circuit time of the short-circuit meetings other than the short-circuit meeting which was reduced was extended so that the total short-circuit time might become substantially the same before and after reducing the short-circuit as a whole. Thereby, the change of the DC output voltage before and after reduction of a short circuit became small, and the influence on a load was also made small.

In addition, in the embodiment, the short circuit time of the short circuit except for the short circuit is reduced in proportion to each short circuit time in the previous half cycle, so that not only the DC output voltage but also the power factor and power source harmonic currents change before and after the short circuit is reduced. As it becomes closer to the continuous change, the control of the connected load is eliminated the need for special control accompanying the change of the number of short circuits, so that the necessary short circuit can be reduced at will, and the product development speed can be increased. .

In step S321, the remaining time Tr6 is set as the total value of the time in which the sixth short-circuit time Ta6 of the previous half cycle is added proportionally proportionally to the respective short-circuit times by the first to fifth short-circuit times of the previous half-cycle, and step S322 Proceeds to and calculates and sets the short-circuit time T'a5 of the fifth time of this half cycle by the following equation.

Next, the flow advances to step S323 to compare the set T'a5 with the fifth short time limit upper limit Tu55 of the fifth paragraph called from the storage device, and the set short time T'a5 calls from the storage device. If the upper limit value is Tu55 or less, the setting is validated and the process proceeds to step S328. If the set short time T'a5 is larger than the short time limit upper limit Tu55 called from the storage device, the process proceeds to step S325.

In step S325, the set short-circuit time T'a5 is discarded, the short-circuit time upper limit value Tu55 called from the storage device is reset as the fifth short-circuit time T'a5 of this half cycle, and the flow proceeds to step S328. In step S328, the remaining time Tr5 obtained by subtracting the correction amount T'a5-Ta5 at the setting of the fifth short time from the remaining time Tr6 is calculated by the following equation.

Next, the flow proceeds to step S332, and in order to add the remaining residual time Tr5 proportionally to the respective short-circuit times to the short-circuit times of the first to fourth times, the fourth short-circuit time of this half cycle is expressed by the following equation. Compute and set T'a4.

Next, the flow advances to step S333 and the set T'a4 is compared with the fourth short-circuit time upper limit value TuMm4 of the Mm-times paragraph called from the storage device. Here, Mm is the number of short circuits in this half cycle, and since the number of short circuits in the previous half cycle is 6, the number of short circuits is reduced once from this and Mm becomes five. Therefore, specifically re-reading step S333 becomes as follows.

The set T'a4 is compared with the fourth short-circuit time upper limit value Tu54 of the fifth paragraph called from the storage device, and the setting is effective when the set short-time T'a4 is equal to or lower than the short-circuit time upper limit value Tu54 called from the storage device. The process proceeds to step S338. If the set short time T'a4 is larger than the short time upper limit Tu54 called from the storage device, the flow proceeds to step S335.

In step S335, the set short-circuit time T'a4 is discarded, and the short-circuit time upper limit value Tu54 called from the storage device is reset as the fourth short-circuit time T'a4 of this half cycle, and the flow advances to step S338. In step S338, the remaining time Tr4 obtained by subtracting the correction amount T'a4-Ta4 at the setting of the fourth short time from the remaining time Tr5 is calculated by the following equation.

In the same manner, the third short time T'a3 and the remaining remaining time Tr3 are calculated and set in Steps S342 to S348 using Equations 14 and 15, and in Steps S352 to S358 using Equations 16 and 17. The second short time T'a2 and the remaining remaining time Tr2 are calculated and set, and in step S362, using the equation (18), the first short time T'a1 of this half cycle is calculated and set, and the procedure proceeds to step S365. To end the short circuit count reduction process.

Returning to step S302, when the number of short circuits M in the previous half cycle is five, the process proceeds to step S331 in order to reduce the number of short circuits by one and to four circuits, and then the fifth short time T'a5 in the previous half cycle is subsequently applied. In the calculation of the 1st-4th short-circuit time set by the step of the step, it calculates as the remainder time Tr5 which is the sum of the time which should be proportionally added to the 1st-4th short-circuit time in the previous half cycle, Proceed to step S332.

After step S332, the control proceeds as described above, and the short-circuit frequency reduction process ends in step S365.

If the number of short-circuits M in the previous half cycle is smaller than five times again, the flow returns to step S302. If the number of short-circuits M is larger than 3, that is, M = 4, the number of short-circuits is returned. In order to reduce the number of times to three times, the process proceeds to step S341, where the fourth short time T'a4 in the previous half cycle is performed in the previous half cycle of the calculations of the first to third short time times set in the subsequent step. The calculation is performed as the remaining remaining time Tr4, which is the total value of the time to be proportionally applied to the short-circuit time of the first to third times, and the process proceeds to step S342.

After step S342, control advances as mentioned above, and the short circuit count reduction process is complete | finished in step S365.

Next, returning to step S305, when the number of short circuits M in the previous half cycle is 3, the flow proceeds to step S351 to reduce the number of short circuits once to two times, and the third short time T'a3 in the previous half cycle. Is calculated as the remaining residual time Tr3, which is the sum of the times to be proportionally applied to the first to second short-circuit times in the previous half-cycle among the calculations of the first to second short-circuit times set in subsequent steps. The flow then advances to step S352.

After step S352, control advances as mentioned above, and the short circuit count reduction process is complete | finished in step S365.

If the number of short-circuits M in the previous half cycle is less than 3, the process returns to step S305, and if the number of short-circuits M is greater than 1, i.e., M = 2, the flow proceeds to step S310. Subsequently, similarly to step S35 in FIG. 7, the M short-circuit time sum ΣTan in the previous half cycle is compared with the short-circuit time lower limit sum ΣTlMn of the number of paragraphs M.

If the short-circuit time sum ΣTan is less than or equal to the short-circuit time lower limit sum ΣTlMn in step S310, the short-circuit time cannot be shortened to less than or equal to two short-circuit times, and the number of short-circuit times smaller than this is not set, and the flow proceeds to step S361. In step S365, the short-circuit reduction processing is terminated by canceling the setting of the short-circuit control so as not to short-circuit.

In step S310, when the total of the short circuit times ΣTan is greater than the short circuit time lower limit sum ΣTlMn, there is a possibility that the short circuit time is shortened in the current two paragraphs, so that the short circuit meeting time where the short circuit time does not reach the lower limit value is shortened in step S315. Proceeds to, PI control is performed in the same manner as described above to determine the current short circuit time, and the short circuit count reduction process is terminated in step S365.

Next, returning to step S308, if the number of short-circuits M in the previous half cycle is 1 or less, the flow advances to step S361, the setting of the short-circuit is canceled in the same manner as described above, and the short-circuit number reduction process ends in step S365.

As described above, in the DC power supply of the embodiment, when the number of short circuits of the switching means is reduced from M times to M-1, the total value of the short circuit times after short circuit count reduction is shorted to M-1 times before short circuit count reduction. Increment more than the total value of time.

Thus, when the number of short circuits is reduced from n to n-1, instead of simply reducing the number of short circuits, the sum of the short circuit times after reducing the number of short circuits so that the DC voltage is almost the same (short circuit time up to n-1 times) ) Is made longer than the sum of the shorting times up to n-1 before reducing the number of shortings.

As a result, the DC voltage obtained by the short circuit (the short circuit up to n-1 times) after reducing the number of short circuits is higher than the DC voltage obtained in the short circuit up to the n-1 th time before reducing the number of short circuits, before the short circuit number is reduced. The fall of the DC voltage due to the elimination of the n-th short circuit is compensated for, and as a whole, a DC voltage almost equal to the DC voltage before reducing the number of short circuits can be obtained.

For this reason, in order to suppress the power supply harmonic current and to improve the power factor, even if the number of short circuits is increased, the DC voltage hardly changes, so that a DC power supply device capable of ensuring stable operation of a load-bearing device can be provided.

Further, in the DC power supply of the embodiment, when reducing the number of short circuits of the switching means from M to M-1 circuits, the total value of the short circuit times after short circuit count reduction is the sum of the short circuit times up to M times before short circuit count reduction. Make it equal to the value.

As a result, when the number of short circuits is reduced, the sum of the short circuit times is made equal. Thereby, the sum total of the short circuit time before and after reducing the number of short circuits becomes the same, and the DC voltage obtained can be kept substantially constant.

For this reason, in order to suppress the power supply harmonic current and to improve the power factor, even if the number of short circuits is increased, the DC voltage hardly changes, so that a DC power supply device capable of ensuring stable operation of a load-bearing device can be provided.

[Example 2]

It demonstrates using FIG. 11, FIG. 11 is a block diagram showing a circuit configuration of a power supply device. 12 is a diagram illustrating a relationship between an input current and a target DC voltage.

11 shows the peripheral information detecting means 118 of FIG. 1 as the input current detecting means 112. By changing the target voltage by the input current as shown in Fig. 12, an appropriate DC power supply device can be obtained.

As described above, the DC power supply apparatus of the embodiment further includes an input current detecting means for detecting an input current from the AC power supply, and the switching control means sets the number of short circuits of the switching means from 2 to 6 times in the ratio. It determines according to a value and the input current detected by the said input current detection means.

As a result, the number of short circuits can be appropriately determined according to the value of the ratio and the magnitude of the input current, so that the power factor can be improved and high efficiency operation can be achieved while satisfying the regulation of the power supply harmonic current. In this case, as the method of determining the shortest number of short circuits, there is a method of converting an input current into a target DC voltage, obtaining a value of the ratio with the power supply voltage, and determining the number of short circuits by the above-described method according to the ratio value.

As a method of converting the input current into a target DC voltage, for example, as shown in FIG. 23, the input current is divided into appropriate values according to the characteristics of the apparatus, and the target DC voltage at each point is determined by experiments or the like. In the middle, a method of determining a target DC voltage by a method such as linear interpolation, step shape change, curve interpolation, or the like may be adopted. In this way, the target DC voltage can be easily set in the entire range of the input current, the power factor can be improved, and high efficiency operation can be performed while satisfying the regulation of the power supply harmonic current.

For this reason, the DC power supply which realizes high efficiency and suitable power factor at low load, and high power factor and moderate efficiency at high load can be provided, suppressing power supply harmonic current by a cheap circuit structure.

[Example 3]

FIG. 13 shows the surrounding information detecting means 118 of FIG. 1 as the load amount detecting means 113. By changing the target voltage in accordance with the load amount as shown in Fig. 14, a preferable DC power supply device can be obtained.

As described above, the DC power supply device of the embodiment further includes load amount detecting means for detecting the load amount connected to the DC power, and the switching control means sets the number of short circuits of the switching means from 2 to 6 times as the value of the ratio. And the load amount detected by the load amount detection means.

As a result, the number of short circuits can be appropriately determined according to the value of the ratio and the magnitude of the load, so that the power factor can be improved and high efficiency operation can be achieved while satisfying the regulation of the power supply harmonic current. In this case, as the method of determining the shortest number of short circuits, there is a method in which the load amount is converted into a target DC voltage, the value of the ratio with the power supply voltage is determined, and the number of short circuits is determined by the above-described method according to the ratio value.

As a method for converting the load amount into a target DC voltage, for example, the target DC voltage may be determined in the same manner as described above according to the graph as shown in FIG. 23. By doing in this way, a target DC voltage can be set easily in the whole load amount, the power factor can be improved and high efficiency operation | movement can be satisfied, satisfying the regulation of a power supply harmonic current.

For this reason, the DC power supply which realizes high efficiency and suitable power factor at low load, and high power factor and moderate efficiency at high load can be provided, suppressing power supply harmonic current by a cheap circuit structure.

As the load amount, for example, according to the purpose of the control, for example, the DC voltage obtained, the DC current, the temperature of each part of the apparatus to be the load (for example, the temperature of the refrigeration cycle), and the temperature of the environment in which the apparatus to be loaded is placed ( For example, various quantities, such as indoor and outdoor temperature), can be used.

Example 4

It demonstrates using FIG. 15, FIG. It is a figure which shows the relationship between a motor speed and target DC voltage. Fig. 16 is a block diagram showing the circuit construction of the power supply device of the third embodiment.

FIG. 15 shows the load 104b of FIG. 1 as the motor 114 and the peripheral information detecting means 118 as the motor applied voltage detecting means 115. By changing the target voltage according to the motor applied voltage as shown in Fig. 16, a preferable DC power supply device can be obtained.

Thus, the DC power supply apparatus of an Example makes the load connected to the said DC power a motor, makes the said load amount the voltage applied to the motor, and detects the voltage applied to the motor as said load amount detection means. A detection means is provided, and the switching control means determines the number of short circuits from 2 to 6 times of the switching means in accordance with the value of the ratio and the motor applied voltage detected by the motor applied voltage detection means.

As a result, the number of short circuits can be appropriately determined according to the value of the ratio and the height of the motor applied voltage. Therefore, the power factor can be improved and the operation can be performed with high efficiency while satisfying the regulation of the power supply harmonic current. In this case, as a method of determining the simplest number of short circuits, there is a method of converting a motor applied voltage into a target DC voltage, obtaining a value of the ratio to the power supply voltage, and determining the number of short circuits by the above-described method according to the ratio value.

As a method of converting the motor applied voltage into a target DC voltage, for example, the target DC voltage may be determined in the same manner as described above according to the graph shown in FIG. 23. By doing in this way, a target DC voltage can be set easily in the whole range of a motor application voltage, the power factor can be improved and high efficiency operation | movement can be satisfied, satisfying the regulation of a power supply harmonic current.

For this reason, the DC power supply which realizes high efficiency and suitable power factor at low load, and high power factor and moderate efficiency at high load can be provided, suppressing power supply harmonic current by a cheap circuit structure.

In addition, the same effect can be obtained by using the voltage indication value or PWM duty indication value which an inverter control means gives to a PWM output part instead of a motor application voltage.

[Example 5]

It demonstrates using FIG. 17, FIG. Fig. 17 is a block diagram showing the circuit construction of the power supply device of the fourth embodiment. Fig. 18 is a block diagram showing the circuit construction of the power supply device of the fifth embodiment.

17 shows the load 104b of FIG. 1 as the motor 114 and the peripheral information detecting means 118 as the motor rotation speed detecting means 116. By changing the target voltage in accordance with the motor rotational speed as shown in Fig. 18, a preferable DC power supply device can be obtained.

As described above, the DC power supply apparatus of the embodiment uses a load connected to the DC power as a motor, the load amount as the rotation speed of the motor, and the motor rotation speed detection means for detecting the rotation speed of the motor as the load amount detection means. And the switching control means determines the number of short circuits from 2 to 6 times of the switching means in accordance with the value of the ratio and the motor rotation speed detected by the motor rotation speed detection means.

As a result, the number of short circuits can be appropriately determined according to the value of the ratio and the height of the motor rotation speed. Thus, the power factor can be improved and the operation can be performed with high efficiency while satisfying the regulation of the power supply harmonic current. In this case, as the method of determining the shortest number of short circuits, there is a method of converting the motor rotational speed into a target DC voltage, obtaining a value of the ratio to the power supply voltage, and determining the number of short circuits by the above-described method according to the ratio value.

As a method of converting the motor rotational speed into a target DC voltage, for example, the target DC voltage may be determined in the same manner as described above according to a graph as shown in FIG. 23. By doing in this way, a target DC voltage can be set easily in the whole range of motor rotation speed, power factor can be improved, and high efficiency operation | movement can be satisfied, satisfying the regulation of a power supply harmonic current.

For this reason, the DC power supply which realizes high efficiency and suitable power factor at low load, and high power factor and moderate efficiency at high load can be provided, suppressing power supply harmonic current by a cheap circuit structure.

In addition, the same effect can be obtained also by using the motor speed indication value which an inverter control means gives to a PWM output part instead of a motor speed.

[Example 6]

Hereinafter, the air conditioner using the above-described DC power supply device of Embodiment 6 will be described with reference to FIG. 19. 19 is a configuration diagram of an air conditioner of a sixth embodiment.

In FIG. 27, what is generally shown by the code | symbol 1 is an air conditioner, The indoor unit 2 and the outdoor unit 6 are connected with the connection piping 8, and the room is air-conditioned. The indoor unit 2 is configured by attaching an indoor heat exchanger, an indoor blower, a condensation tray, etc. to the case 21, covering it with the makeup frame 23, and attaching the front panel 25 to the front of the makeup frame 23. It is. The makeup frame 23 is provided with an air intake port 27 for sucking indoor air and an air blowing port 29 for blowing out air in which temperature and humidity are harmonized.

The indoor unit 2 is provided with a control board in the electrical equipment box which is not shown in the inside, and a microcomputer is provided in the control board. The microcomputer receives signals from various sensors such as an indoor temperature sensor and an indoor humidity sensor (not shown), receives an operation signal from the remote control unit 5 at the light receiving unit 396, controls an indoor blower, and the like. The indoor unit 2 is collectively controlled, for example, in charge of communication with the outdoor unit 6.

The outdoor unit 6 is equipped with a compressor, an outdoor heat exchanger and an outdoor blower on the base 61, covered with an outer case 62, and the pipe connecting valve 78 connects the connecting pipe 8 from the indoor unit 2 to the pipe connecting valve 78. You are connected.

When operating this air conditioner 1, it connects to a power supply (not shown), operates the remote control 5, and operates desired cooling, dehumidification, and heating.

In the case of operation such as cooling, when a signal of driving operation is made from the remote controller 5, the microcomputer (not shown) is based on information from various sensors if the operation signal from the remote controller 5 or automatic driving is set. Determine the operation mode, such as cooling.

Next, while instructing the control unit (not shown) of the outdoor unit 6 to operate in accordance with the operation mode determined, the indoor blower is driven in accordance with the determined operation mode, and the indoor air is supplied from the air intake unit 27 to the indoor heat exchanger. Circulate. The control unit of the outdoor unit 6 controls the compressor, the blower motor, the control valve, etc. according to the instructions from the indoor unit 2, circulates the refrigerant from the compressor in a refrigeration cycle, and opens the outdoor unit from the outdoor air intake unit to the outdoor heat exchanger. Let air through. In this way, operation of well-known cooling etc. is performed.

The outdoor unit 6 will be described in more detail with reference to FIGS. 20 to 22. It is a perspective view of the internal structure of the outdoor unit of an air conditioner. It is a top view which removed the upper plate of the outdoor unit. It is a front view which removed the front plate of the outdoor unit.

The outer case 62 includes a front plate 621, a side plate 623, an upper plate 622, and the like, and an inlet of outdoor air is installed on an outer surface of the outer case 62 facing the outdoor heat exchanger 73. On the front plate 621 opposite to 631, a fan grill 635 capable of freely distributing air is provided. The outdoor fan 631 is rotationally driven such that the outdoor heat exchanger 73 is upstream and the fan grill 635 is downstream, so as to distribute the outdoor air to the outdoor heat exchanger 73 as described above.

The outdoor heat exchanger 73 is disposed in a substantially L shape from the side surface of the outdoor unit 6 to the rear surface, and secures a large area as much as possible to increase the heat exchange ability. As much as possible, the outdoor fan 631 is also used. A partition plate 611 is provided between the outdoor fan 631 and the compressor 75 to partition the blower chamber 64 and the machine chamber 68.

The outdoor fan 631 and the outdoor heat exchanger 73 are arrange | positioned in the blower chamber 64 as mentioned above. In the machine room 68, a compressor 75, an accumulator 76, a refrigerant delivery pipe, and the like are disposed. The electrical components for driving the motor 114 of the compressor 75, the above-described inverter 104a, the DC power supply device 100, the blower motor 633, and the like are used in order to facilitate handling during manufacturing or maintenance. It is stored in the box 65.

However, the reactor 105 of the DC power supply device 100 is composed of an iron core and a copper winding, and because of its large mass, the reactor 105 is independently attached to the blower chamber 64 without being stored in the electric box 65. There are many cases. However, the electrical equipment as described above, which is housed in the electrical equipment box 65 except for the reactor 105, drives the compressor 75, the blower motor 633, and the like, and thus has a large capacity, and also generates heat from the electrical equipment. It becomes large and needs to perform the cooling effectively.

For this reason, these electrical equipment cannot be arrange | positioned densely, and the magnitude | size of the electrical equipment box 65 also inevitably becomes large, and it is protruded into the blower chamber 64, without being accommodated in the upper part of the machine room 68. In the Example, the electrical equipment box 65 was provided in the upper part of the partition board 611 across the blower chamber 64 and the machine room 68. As shown in FIG. In this manner, the blower chamber 64 is provided with a portion protruding from the partition plate 611 of the electrical equipment box 65 and the reactor 105.

Although the blower chamber 64 appears to be relatively large, placing the reactor 105 at a position that obstructs the ventilation of the outdoor fan 631 increases the negative influence such as a decrease in the amount of blown air or an increase in noise, resulting in an undesirable result. do. For this reason, the part protruding from the partition board 611 of the electrical equipment box 65, and the reactor 105 are placed as far away as possible from the outdoor fan 631, ie, in the corner of the blower chamber 64. You must.

In view of such a situation, the reactor 105 has a large mass, and thus, in order to ensure the attachment and fixing, the reactor 105 is disposed near the partition plate 611 at a lower position close to the base 61, and the electrical equipment box 65 is As described above, the blower chamber 64 and the machine chamber 68 are provided above the partition plate 611. In addition, the part placed in the blower chamber 65 needs to be made as small as possible in order to reduce the influence on the outdoor fan 631.

For this reason, in order to reduce the size of the electric component having a large capacity and to efficiently cool the electric component, the negative pressure of the outdoor fan 631 which ventilates the outside air for heat exchange in the outdoor heat exchanger 73 is used. Cooling air is introduced into the book. In such a situation, reducing the capacity of the reactor 105 has a great effect on the miniaturization and performance improvement of the air conditioner.

Thus, the air conditioner of an Example is equipped with the rotation speed control type compressor, and uses the DC power supply device of Claims 1-11.

As a result, the operation (lower rotational speed of the compressor and continuous operation at a small capacity) is very long when the indoor temperature is close to the set temperature, so that switching loss is small and efficient operation is continued for a long time, thereby reducing power consumption. It can be suppressed.

In addition, at the time of high load such as the beginning of the air conditioning operation, the number of switching is increased, so that the compression motor overcomes the induced voltage, rotates at high speed, and boosts the DC voltage so that the compressor exhibits a large capacity. By utilizing the capacity of the breaker connected to the air conditioner or the outlet or the outlet, the capacity of the air conditioner can be maximized to maximize the capacity of the air conditioner.

For this reason, it is possible to provide an air conditioner which is inexpensive, satisfies the power supply harmonic current regulation, and has a high capacity and efficient efficiency utilizing the power supply capacity to the maximum.

In addition, the present invention can be widely applied not only to air conditioners but also to electronic devices using DC power supplies.

As described above, according to the DC power supply device according to claim 1, the rectifier circuit converts AC power input from an AC power source into DC power, a reactor connected between the AC power source and the rectifier circuit, and the AC power source. Switching means for shorting through the reactor, target voltage setting means for the DC power, frequency detecting means for detecting a frequency of the AC power supply, power supply voltage detecting means for detecting a power supply voltage of the AC power supply, and AC Zero cross detection means for detecting a zero cross point of a power supply, a DC voltage detection means for detecting a DC voltage as an output of the rectifying circuit, and switching control means for shorting and opening the switching means in synchronization with the zero cross point. And the switching control means is a neck set by the target voltage setting means. In the 1/2 cycle from the zero cross point of the AC power supply detected by the zero cross detection means when the value of the ratio between the DC voltage and the power supply voltage detected by the power supply voltage detecting means is less than a predetermined value, The switching means are short-circuited twice, and the first and second short-circuit intervals of the two short circuits are 0.2 to 0.4 kHz when the power supply frequency detected by the frequency detecting means is 50 kHz, and the power supply frequency is 60 kHz. Is 0.16 to 0.33 kPa. After that, when the value of the ratio is greater than or equal to the predetermined value, the number of short circuits of the switching means is increased more than two times according to the value of the ratio, and the operation of the built-in motor Switch the noise frequency to the number of short circuits in which the noise frequency of the DC power supply is not exceeded.

Thereby, the DC voltage which is optimal for driving the load is set by the target voltage setting means, and when the value of the ratio with the effective value of the power supply voltage is less than the predetermined value, that is, when the load is light and the operation is performed at a small capacity By short-circuiting twice at an appropriate short-circuit interval according to the power supply frequency, the power factor can be increased while suppressing the power supply harmonic current. At this time, since the number of switching is only two, the switching loss is small and efficient operation can be performed.

In addition, when the value of the ratio between the target voltage and the effective value of the power supply voltage is equal to or greater than a predetermined value, that is, when the load is heavy and operating at high capacity, the power supply harmonic current is monotonously increased by monotonically increasing the number of short circuits up to six times. It is possible to cover the fluctuation of the power supply voltage while keeping the voltage below the regulated value, and to make the boost of the DC voltage and the up of the power factor compatible. At this time, since the number of switching is at most six times, the switching loss also ends up slightly and high efficiency can be maintained.

In this case, the second short circuit focuses on increasing the power factor and suppressing the power supply harmonic current, and the third short circuit focuses on the DC voltage boost, and the fourth short circuit increases the DC voltage boost and power factor. In the fifth and sixth paragraphs, the short circuit operation is performed mainly by increasing the power factor.

In particular, in the case where the load to be driven is a compressor of the air conditioner, the air conditioner loses switching because the operation in a condition where the room temperature is close to the set temperature (low speed of the compressor and continuous operation at a small capacity) is very long. This small and efficient operation is continued for a long time, and the amount of power consumption can be suppressed.

In addition, at the time of high load such as the beginning of the air conditioning operation, the number of switching is increased, and the compressor is driven by boosting the DC voltage so that the compression motor can rotate at high speed by overcoming the induced voltage and exhibit high capacity. By utilizing the capacity of the breaker connected to the air conditioner or the outlet or the outlet, the capacity of the air conditioner can be maximized to maximize the capacity of the air conditioner.

For this reason, the DC power supply which realizes high efficiency and a suitable power factor at low load, and high power factor and a moderate efficiency at high load can be obtained, suppressing power supply harmonic current by a cheap circuit structure.

In addition, according to the DC power supply device according to claim 2, the switching control means is configured such that the value of the ratio between the target DC voltage set by the target voltage setting means and the power supply voltage detected by the power supply voltage detection means is equal to or greater than a predetermined value. In the same manner as in the case of the above two short circuits, the switching means are short-circuited twice in a half period from the zero cross point of the AC power supply detected by the zero cross detection means, and one of these two short circuits is performed. The short-circuit intervals of the first and second times are 0.2 to 0.4 kHz when the power supply frequency detected by the frequency detecting means is 50 kHz, and 0.16 to 0.33 kHz when the power supply frequency is 60 kHz. When the value is greater than or equal to the predetermined value, the operation noise of the motor of the built-in apparatus is set more than the number of short circuits of the switching means more than two times depending on the value of the ratio. Be switched to short circuit the number of times that the noise frequency of the AC adapter is not in excess with respect to the wave number.

As a result, even in the case of shorting the number of times exceeding 2, by setting the appropriate interval between the first short circuit and the second short circuit in the same manner as described above, the suppression of the power supply harmonic current and the improvement of the power factor can be achieved.

For this reason, the DC power supply which realizes high efficiency and a suitable power factor at low load, and high power factor and a moderate efficiency at high load can be obtained, suppressing power supply harmonic current by a cheap circuit structure.

According to the DC power supply device according to claim 3, the switching control means sets the short-circuit time after the third time to be 0.25 kHz or less when the power supply frequency is 50 kHz, or 0.2 kHz or less when the 60 kHz power is applied.

As a result, the frequency of the power supply harmonic current generated by the short circuit after the third time becomes 2,000 kHz or higher when the power supply frequency is 50 kHz, or 2,500 kHz or higher when the power supply frequency is 50 kHz, and becomes 40 or more times of the power supply frequency. Since it is excluded from the regulation, it is possible to satisfy the power supply harmonic current regulation, and it is only necessary to consider the improvement in power factor.

In order to suppress the harmonic current and to increase the power factor, it has been described above that it is effective to increase the number of short circuits, but according to the simulation, it is effective to increase the number of short circuits for suppressing the 3rd to 15th harmonics related to the power factor. However, the harmonic currents of the 15th to 40th order tend to increase on the contrary.

Therefore, it was found that the short circuit after the second short circuit has a waveform having a dimension higher than the 40th order, which is important for suppressing the power supply harmonic current. When the power supply frequency is 50 kHz, it is a sine wave of the period 20 kHz, and the period of the 40th harmonic of the power supply frequency is 0.5 kHz.

When the triangular wave generated by the short circuit becomes less than 1/2 of the period of the 40th order, the power supply harmonic current regulation becomes out of the target and the power supply harmonic current regulation can be satisfied by shortening the short circuit time to 0.25 ㎳. Similarly, when the power supply frequency is 60 Hz, the short circuit time is shorter than 0.2 Hz to satisfy the power supply harmonic current regulation.

For this reason, the DC power supply which satisfies the power supply harmonic current regulation can be obtained, while improving the power factor by increasing the number of short circuits.

In addition, according to the DC power supply device according to claim 4, when the number of short circuits of the switching means is increased from M times to M + 1, the total value of the short circuit time from the M number after the number of short circuits is increased to the short circuit before the number of short circuits is increased. Decrease than the sum of time.

Thus, when increasing the number of short circuits from n to n + 1, instead of simply increasing the number of short circuits, the sum of the short circuit times up to n times after increasing the number of short circuits is increased so that the DC voltage is almost the same. It is made shorter than the sum of the short time to n times before extending | stretching. As a result, the DC voltage obtained by the short-circuit up to n times after increasing the number of short-circuits decreases, and the direct-current voltage before the increase in the short-circuit frequency as a whole is made up by retrieving the DC voltage equivalent to this drop in the n + 1th short-circuit. A DC voltage almost equal to the voltage can be obtained.

For this reason, in order to suppress the power supply harmonic current and to improve the power factor, even if the number of short circuits is increased, the DC voltage hardly changes, so that a DC power supply device capable of ensuring stable operation of an apparatus under load can be obtained.

According to the DC power supply device according to claim 5, when the number of short circuits of the switching means is increased from M times to M + 1 times, the total value of the short circuit times from M + 1 times to M times before increasing the number of short circuits. It is equal to the total value of the short time.

Thereby, when the number of short circuits is increased, the sum of the short circuit times is made equal. Thereby, the sum total of the short circuit time before and after increasing the number of short circuits becomes the same, and the DC voltage obtained can be kept substantially constant.

For this reason, in order to suppress the power supply harmonic current and to improve the power factor, even if the number of short circuits is increased, the DC voltage hardly changes, so that a DC power supply device capable of ensuring stable operation of an apparatus under load can be obtained.

According to the DC power supply device according to claim 6, when the number of short circuits of the switching means is reduced from M times to M-1, the total value of the short circuit times after short circuit count reduction is reduced to M-1 times before short circuit count reduction. Increase the shorter time than the total value.

Thus, when the number of short circuits is reduced from n to n-1, instead of simply reducing the number of short circuits, the sum of the short circuit times after reducing the number of short circuits so that the DC voltage is almost the same (short circuit time up to n-1 times) ) Is made longer than the sum of the time periods up to n-1 before reducing the number of paragraphs.

As a result, the DC voltage obtained by the short circuit (the short circuit up to n-1 times) after reducing the number of short circuits is higher than the DC voltage obtained by the short circuit up to the n-1 th time before reducing the number of short circuits, and before reducing the number of short circuits. The fall of the DC voltage due to the elimination of the n-th short circuit is compensated for, and as a whole, a DC voltage almost equal to the DC voltage before reducing the number of short circuits can be obtained.

For this reason, in order to suppress the power supply harmonic current and to improve the power factor, even if the number of short circuits is increased, the DC voltage hardly changes, so that a DC power supply device capable of ensuring stable operation of an apparatus under load can be obtained.

In addition, according to the DC power supply device according to claim 7, when the number of short circuits of the switching means is reduced from M times to M-1, the total value of the short circuit times after short circuit count reduction is shorted to M times before short circuit count reduction. It is equal to the total value of time.

As a result, when the number of short circuits is reduced, the sum of the short circuit times is made equal. Thereby, the sum total of the short circuit time before and after reducing the number of short circuits becomes the same, and the DC voltage obtained can be kept substantially constant.

For this reason, in order to suppress the power supply harmonic current and to improve the power factor, even if the number of short circuits is increased, a DC power supply device capable of ensuring stable operation of an apparatus under load can be obtained with little change in the DC voltage.

In addition, according to the DC power supply apparatus according to claim 8, further comprising an input current detecting means for detecting an input current from the AC power supply, wherein the switching control means is configured to recognize the number of short circuits of the switching means from 2 to 6 times. It determines with the value of ratio and the input current detected by the said input current detection means.

As a result, the number of short circuits can be appropriately determined according to the value of the ratio and the magnitude of the input current, so that the power factor can be improved and high efficiency operation can be achieved while satisfying the regulation of the power supply harmonic current. In this case, as the method of determining the shortest number of short circuits, there is a method of converting an input current into a target DC voltage, obtaining a value of the ratio with the power supply voltage, and determining the number of short circuits by the above-described method according to the ratio value.

As a method of converting the input current into a target DC voltage, for example, as shown in FIG. 23, the input current is divided into appropriate values according to the characteristics of the apparatus, and the target DC voltage at each point is determined by experiments or the like. In the middle, a method of determining a target DC voltage by a method such as linear interpolation, step shape change, curve interpolation, or the like may be adopted. In this way, the target DC voltage can be easily set in the entire range of the input current, the power factor can be improved, and high efficiency operation can be performed while satisfying the regulation of the power supply harmonic current.

For this reason, the DC power supply which realizes high efficiency and a suitable power factor at low load, and high power factor and a moderate efficiency at high load can be obtained, suppressing power supply harmonic current by a cheap circuit structure.

Furthermore, according to the DC power supply device according to claim 9, the apparatus further includes load amount detecting means for detecting a load amount connected to the DC power, and the switching control means sets the ratio of the number of short circuits of the switching means to 2 to 6 times. Is determined according to the value of and the load amount detected by the load amount detecting means.

As a result, the number of short circuits can be appropriately determined according to the value of the ratio and the magnitude of the load, so that the power factor can be improved and high efficiency operation can be achieved while satisfying the regulation of the power supply harmonic current. In this case, as the method of determining the shortest number of short circuits, there is a method in which the load amount is converted into a target DC voltage, the value of the ratio with the power supply voltage is determined, and the number of short circuits is determined by the above-described method according to the ratio value.

As a method for converting the load amount into a target DC voltage, for example, the target DC voltage may be determined in the same manner as described above according to the graph as shown in FIG. 23. By doing in this way, a target DC voltage can be set easily in the whole load amount, the power factor can be improved and high efficiency operation | movement can be satisfied, satisfying the regulation of a power supply harmonic current.

For this reason, the DC power supply which realizes high efficiency and a suitable power factor at low load, and high power factor and a moderate efficiency at high load can be obtained, suppressing power supply harmonic current by a cheap circuit structure.

Moreover, according to the DC power supply device of Claim 10, the motor which makes the load connected to the said DC power the motor, makes the said load amount the voltage applied to the said motor, and detects the voltage applied to the motor as said load amount detection means. Applied voltage detection means is provided, and the switching control means determines the number of short circuits from 2 to 6 times of the switching means in accordance with the value of the ratio and the motor applied voltage detected by the motor applied voltage detection means.

As a result, the number of short circuits can be appropriately determined according to the value of the ratio and the height of the motor applied voltage. Therefore, the power factor can be improved and the operation can be performed with high efficiency while satisfying the regulation of the power supply harmonic current. In this case, as the method of determining the shortest number of short circuits, there is a method of converting a motor applied voltage into a target DC voltage, obtaining a value of the ratio with the power supply voltage, and determining the number of short circuits by the above-described method according to the ratio value.

As a method of converting the motor applied voltage into a target DC voltage, for example, the target DC voltage may be determined in the same manner as described above according to the graph shown in FIG. 23. By doing in this way, a target DC voltage can be set easily in the whole range of a motor application voltage, the power factor can be improved and high efficiency operation | movement can be satisfied, satisfying the regulation of a power supply harmonic current.

For this reason, the DC power supply which realizes high efficiency and a suitable power factor at low load, and high power factor and a moderate efficiency at high load can be obtained, suppressing power supply harmonic current by a cheap circuit structure.

Moreover, according to the DC power supply device of Claim 11, the motor rotation speed which makes the load connected to the said DC power the motor, makes the said load amount the rotation speed of the said motor, and detects the rotation speed of a motor as said load quantity detection means. A detection means is provided, and the switching control means determines the number of short circuits from 2 to 6 times of the switching means in accordance with the value of the ratio and the motor speed detected by the motor speed detection means.

As a result, the number of short circuits can be appropriately determined according to the value of the ratio and the height of the motor rotation speed. Thus, the power factor can be improved and the operation can be performed with high efficiency while satisfying the regulation of the power supply harmonic current. In this case, as the method of determining the shortest number of short circuits, there is a method of converting the motor rotational speed into a target DC voltage, obtaining a value of the ratio to the power supply voltage, and determining the number of short circuits by the above-described method according to the ratio value.

As a method of converting the motor rotational speed into a target DC voltage, for example, the target DC voltage may be determined in the same manner as described above according to a graph as shown in FIG. 23. By doing in this way, a target DC voltage can be set easily in the whole range of motor rotation speed, power factor can be improved, and high efficiency operation | movement can be satisfied, satisfying the regulation of a power supply harmonic current.

For this reason, the DC power supply which realizes high efficiency and a suitable power factor at low load, and high power factor and a moderate efficiency at high load can be obtained, suppressing power supply harmonic current by a cheap circuit structure.

Moreover, according to the air conditioner of Claim 12, the rotation speed control compressor is mounted and the DC power supply device of Claims 1-11 is used.

As a result, the operation (lower rotational speed of the compressor and continuous operation at a small capacity) is very long when the indoor temperature is close to the set temperature, so that switching loss is small and efficient operation is continued for a long time, thereby reducing power consumption. It can be suppressed.

In addition, at the time of high load such as the beginning of the air conditioning operation, the number of switching is increased to increase the DC voltage so that the compression motor overcomes the induced voltage, rotates at high speed, and exhibits a large capacity, thereby driving the compressor. By utilizing the capacity of the breaker connected to the air conditioner or the outlet or the outlet, the capacity of the air conditioner can be maximized to maximize the capacity of the air conditioner.

For this reason, it is possible to obtain an air conditioner which is inexpensive, satisfies the power source harmonic current regulation, and utilizes the power capacity to the maximum and has high efficiency.

1: air conditioner
2: indoor unit
5: remote control
6: outdoor unit
8: connection piping
10: control unit
20: case
21: Case Base
23: makeup frame
25: front panel
27: air intake
29 air outlet
33: indoor heat exchanger
35: condensation dish
37: drain piping
61: base
62: outer case
64: blower room
65: battlefield box
66: battlefield box cover
67: electric equipment
68: machine room
73: outdoor heat exchanger
75: compressor
76: accumulator
78: piping connection valve
82 connection opening
100: DC power supply
101: AC power
102: rectifier circuit
103: smoothing capacitor
104: load
104a: Inverter
104b: external load
105: reactor
106: switching means
107: power supply voltage, zero cross detection means
108: switching control means
109: DC voltage detection means
110: inverter driver
111: Microcomputer
111a: frequency detection means
111b, 111d: A / D converter
111c, 111e: PWM output section
111f: converter control means
111g: inverter control means
111h: target voltage setting means
112: input current detection means
113: load amount detection means
114 motor
115: motor applied voltage detection means
116: motor speed detection means
118: peripheral information detection means
230, 230 ': air intake
231, 231 ': filter
251: Movable Panel
290: blow-out cooker
290a: upper wall of the blower
290b: blowout air passage bottom wall
291: upper and lower wind direction plate
292: upper and lower wind direction plate
295: left and right wind direction plate
311 blower fan
396: transceiver
397: display device
611 partition plate
612: Reactor Cover
621: front panel
621a: motor base
621e: Fan Ring
621g: opening base
622 top plate
623: side plate
631: Outdoor Fan
633: blower motor
635: Pan Grill

Claims (12)

Rectification circuit which converts AC power input from AC power into DC power,
A reactor connected between the AC power supply and the rectifier circuit,
Switching means for shorting the AC power supply through the reactor;
Target voltage setting means for the DC power;
Frequency detecting means for detecting a frequency of the AC power supply;
Power supply voltage detection means for detecting a power supply voltage of the AC power supply;
Zero cross detection means for detecting a zero cross point of the AC power supply;
DC voltage detection means for detecting a DC voltage which is an output of the rectifier circuit;
A direct current power supply device comprising switching control means for shorting and opening the switching means in synchronization with the zero cross point,
The switching control means has a predetermined value (Vg / Vs) of a ratio between the target DC voltage Vg set by the target voltage setting means and the effective value Vs of the power supply voltage detected by the power supply voltage detection means. In the case of less than one, during the 1/2 cycle from the zero cross point of the AC power supply detected by the zero cross detection means, the switching means are short-circuited twice and the time from the zero cross point to the start of the first short circuit is determined. When the power supply frequency detected by the frequency detecting means is 50 kHz, the first and second short circuit intervals of the second short circuit are set to a preset delay time, and the power supply frequency is 60 kHz. In this case, 0.16 to 0.33㎳,
After that, when the value of the ratio (Vg / Vs) is equal to or greater than a predetermined value, the number of short circuits of the switching means is switched more than twice according to the value of the ratio (Vg / Vs). Power unit. Rectification circuit which converts AC power input from AC power into DC power,
A reactor connected between the AC power supply and the rectifier circuit,
Switching means for shorting the AC power supply through the reactor;
Target voltage setting means for the DC power;
Frequency detecting means for detecting a frequency of the AC power supply;
Power supply voltage detection means for detecting a power supply voltage of the AC power supply;
Zero cross detection means for detecting a zero cross point of the AC power supply;
DC voltage detection means for detecting a DC voltage which is an output of the rectifier circuit;
A direct current power supply device comprising switching control means for shorting and opening the switching means in synchronization with the zero cross point,
The switching control means has a predetermined value (Vg / Vs) of a ratio between the target DC voltage Vg set by the target voltage setting means and the effective value Vs of the power supply voltage detected by the power supply voltage detection means. In the case of abnormality, the switching means is short-circuited twice during the 1/2 cycle from the zero cross point of the AC power source detected by the zero cross detection means, and the time from the zero cross point to the start of the first short circuit is determined. When the power supply frequency detected by the frequency detecting means is 50 kHz, the first and second short circuit intervals of the second short circuit are set to a preset delay time, and the power supply frequency is 60 kHz. In this case, 0.16 to 0.33㎳,
After that, when the value of the ratio (Vg / Vs) is equal to or greater than a predetermined value, the number of short circuits of the switching means is switched more than twice according to the value of the ratio (Vg / Vs). Power unit. The method according to claim 1 or 2,
And said switching control means sets the short-circuit time after the third time within a range of 0.25 Hz when the power frequency is 50 Hz and 0.2 Hz or less when 60 Hz. The method according to claim 1 or 2,
When the number of short circuits of the switching means is increased from M times to M + 1, the total value of the short circuit time from the M number after the short circuit number increase is reduced to the total value of the short circuit time before the short circuit number increase. DC power supply. The method according to claim 1 or 2,
When the number of short circuits of the switching means is increased from M times to M + 1 times, the total value of the short circuit times up to M + 1 times is equal to the total value of the short circuit times up to M times before increasing the number of short circuits. DC power supply. The method according to claim 1 or 2,
When the number of short circuits of the switching means is decreased from M times to M-1, the total value of the short circuit times after the short circuit count decreases is increased to the total of the short circuit times until the M-1 times before the short circuit count decreases. DC power supply. The method according to claim 1 or 2,
When the number of short circuits of the switching means is reduced from M times to M-1, the total value of the short circuit times after short circuit count reduction is made equal to the total value of the short circuit times until M times before short circuit count reduction. , DC power supply. The method of claim 3,
Further comprising input current detecting means for detecting an input current from the AC power supply,
And said switching control means determines the number of short circuits from 2 to 6 times of said switching means in accordance with the value of said ratio and the input current detected by said input current detecting means. The method of claim 3,
And a load amount detecting means for detecting a load amount connected to the DC power,
And the switching control means determines the number of short circuits from 2 to 6 times of the switching means in accordance with the value of the ratio and the load amount detected by the load amount detection means. 10. The method of claim 9,
And a motor applied voltage detecting means for detecting a voltage applied to the motor using the load connected to the DC power as a motor, the load amount being a value corresponding to the voltage applied to the motor,
And said switching control means determines the number of short circuits of two to six times of said switching means in accordance with the value of said ratio and the motor applied voltage detected by said motor applied voltage detecting means. 10. The method of claim 9,
And a motor rotation speed detecting means for detecting a rotation speed of the motor as the load amount detecting means, using the load connected to the DC power as a motor, the load amount being a value corresponding to the rotation speed of the motor,
And said switching control means determines the number of short circuits of two to six times of said switching means in accordance with the value of said ratio and the motor rotation speed detected by said motor rotation speed detecting means. In the air conditioner equipped with a speed control compressor,
The air conditioner of Claim 1 or 2 using the DC power supply.

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