JP2007207451A - Incandescent light bulb socket - Google Patents

Abstract

A socket for an incandescent light bulb having a structure in which a circuit with stable dimming characteristics is incorporated without using a triac or a diac, and the heat generated by the incandescent light bulb is not transmitted to a portion of the housing where the circuit is provided. To provide.
A socket for an incandescent lamp, which is constant with respect to the incandescent lamp even if the input voltage fluctuates between the female base for connecting with the incandescent lamp in the housing and the commercial power line. A power control circuit that enables power supply was provided, and an opening was provided between the space for providing the circuit in the housing and the space for providing the female side base, and the two spaces were separated.
[Selection] Figure 1

Description

  The present invention relates to a socket for an incandescent lamp, and more specifically, even if the supply voltage is unstable, a constant power is supplied to the incandescent lamp and the temperature rise due to the heat generated by the incandescent lamp is suppressed. The invention relates to an incandescent light bulb socket for preventing breakage and explosion of a bulb.

Although 220V AC is used in many overseas countries, the supply voltage is unstable in developing countries, and depending on the region or time zone, a high voltage of up to 300V may be supplied for the rated voltage. There are many. As a result, incandescent light bulbs have a very short life due to excessive voltage generated by the heat generated by excessive voltage. Here, the lifetime of the bulb can be approximated by the following equation.

  For example, an incandescent lamp with a rated life of about 1000 hours when used at a rated voltage of 220V will have a life of about 20 hours from the above formula if it is used at 300V. Many regions in the world have such high voltage time zones, and ball breaks occur frequently.

FIG. 10 is a circuit diagram showing the configuration of a conventional dimmer. The dimmer shown in FIG. 10 is characterized in that a triac (TRC), a diac (DIAC), and a variable resistor (VR) are provided. Charges are accumulated in a capacitor, and a breakdown voltage (threshold voltage) of the diac is obtained. ) Upon reaching a configuration in which the triac is turned on, the diac, the variable resistor and a capacitor, which reduces the power applied to the incandescent lamp La connected in series to a commercial power source V _s. In addition, the power applied to the incandescent lamp La can be adjusted by adjusting the variable resistance.

For example, Patent Literature 1 and Patent Literature 2 exist as the voltage adjustment applied to the incandescent bulb with the same configuration as that of FIG.
JP 60-136199 A JP 2002-136199 A

  The conventional dimmer composed of a diac, variable resistor and capacitor as described above is designed to prevent the inrush current from being turned on until the charge is accumulated in the capacitor and reaches the threshold voltage of the diac. However, there is a problem that the threshold voltage of the diac is largely fluctuated and the dimming characteristics vary. Moreover, although the structure which incorporates the said structure in the inside of a socket has already been proposed, the heat | fever which an incandescent lamp emits conducts inside a socket, and there existed a problem that a temperature rose and had a bad influence on an element.

  The present invention has been made in view of the above-mentioned problems, and without using a triac or a diac, a circuit with stable dimming characteristics is incorporated, and an incandescent lamp is formed in a portion of the housing where the circuit is provided. An object of the present invention is to provide a socket for an incandescent light bulb having a structure in which heat is not transmitted.

  Claim 1 of the present invention is an incandescent lamp socket, which is an incandescent lamp even if the input voltage fluctuates between the female base for connecting with the incandescent lamp in the housing and the commercial power line. An incandescent light bulb socket is provided with a power control circuit that enables constant power supply.

  Claim 2 of the present invention is an incandescent lamp socket, which is an incandescent lamp even if the input voltage fluctuates between the female base for connecting to the incandescent lamp in the housing and the commercial power line. A power control circuit that enables a constant power supply is provided, and an opening is provided between the space for providing the circuit in the housing and the space for providing the female side base, and the two spaces are separated. This is an incandescent light bulb socket.

  According to a third aspect of the present invention, in addition to the first or second aspect, the power control circuit monitors the voltage value of a commercial power source, and when a voltage larger than a voltage value assumed in advance is input, An incandescent lamp socket having a function of maintaining a constant power supply by controlling an on-time of a switching element provided on a line for supplying power to the incandescent lamp.

  According to a fourth aspect of the present invention, in addition to the first or second aspect, the power control circuit includes a rectifier circuit for rectifying a commercial power supply, and a switching element provided between an output and an output terminal of the rectifier circuit. A driving circuit for driving and supplying electric power to the incandescent bulb, and a DC smoothing circuit comprising a capacitor (C1) for smoothing the output of the rectifier circuit and generating a voltage corresponding to the voltage value of the commercial power source between the terminals A soft-start circuit including a current mirror that gradually increases the on-time of the switching element at the start of commercial power supply input and flows a current that is inversely proportional to the voltage value of the capacitor (C1), and a current from the current mirror The capacitor (C3) whose charging time is influenced by the capacitor and a comparator for comparing the terminal voltage of the capacitor (C3) with the reference voltage are provided. A timing circuit for turning on the switching element when the terminal voltage of the sensor (C3) exceeds a reference voltage, and for surely discharging the charge charged in the capacitor (C3) every half wavelength of the rectified wave An incandescent bulb socket comprising a discharge circuit.

  According to a fifth aspect of the present invention, in addition to the fourth aspect, a thermistor is connected between the output of the rectifier circuit and the capacitor (C3), and the resistance value increases as the circuit temperature rises. The incandescent lamp socket is characterized in that the charging time of C3) is increased.

  According to a sixth aspect of the present invention, in addition to the first to fifth aspects, the power control circuit is configured to supply a power smaller than a rated power of an incandescent lamp connected when a commercial power source is input. This is an incandescent light bulb socket.

  According to the first aspect of the present invention, since the power control circuit is provided that enables a constant power supply to the incandescent bulb even if the input voltage fluctuates, the supplied power is stabilized and the temperature of the incandescent bulb increases. Since it is suppressed, it is possible to prevent the ball from breaking or bursting.

  According to the second aspect of the present invention, a power control circuit is provided that enables a constant power supply to the incandescent bulb even if the input voltage fluctuates, and the space in which the circuit is provided in the housing and the female Since the opening is provided between the space where the side cap is provided and the two spaces are separated, the supplied power is stable and the temperature rise of the incandescent bulb can be suppressed. By providing the opening, it is possible to prevent the heat of the incandescent bulb from being transmitted to the circuit portion and to prevent the circuit elements from becoming unstable due to the heat.

  According to the invention described in claim 3, in the power control circuit, the voltage value of the commercial power source is monitored, and when a voltage larger than the voltage value assumed in advance is input, the line for supplying the commercial power source to the incandescent bulb Since the on-time of the switching element provided above is controlled to keep the supplied power constant, the supplied power is stabilized and the temperature rise of the incandescent bulb can be suppressed, so that the bulb can be prevented from breaking or bursting.

According to the fourth aspect of the present invention, when the commercial power source becomes larger than the rated voltage, the voltage value of the capacitor (C1) increases, and when the voltage value of the capacitor (C1) increases, the current flowing through the current mirror The value decreases, the current flowing through the current mirror decreases, the charging time of the capacitor (C3) increases, and the charging time of the capacitor (C3) increases, so that the time to reach the reference voltage in the comparator is increased. This increases the on-time of the switching element, and as a result, the power supplied to the incandescent bulb is kept constant.
Further, since the soft start circuit operates so that the ON time of the switching element is gradually increased from the start of application of the commercial power supply, inrush current can be prevented and soft start can be realized.

According to the fifth aspect of the present invention, a thermistor is connected between the output of the full-wave rectifier circuit and the capacitor (C3), and the resistance value increases as the circuit temperature rises, and the capacitor (C3) Since the charging time is increased, the thermistor detects that the temperature of the circuit portion has increased due to the temperature rise of the incandescent bulb, and the charging time of the capacitor (C3) is increased to shorten the on-time of the switching element. As a result, the amount of heat generated by the incandescent bulb can be reduced by reducing the supply power.
From the above, even if the power becomes unstable and high, (1) prevent ball breakage due to excessive voltage or inrush current, extend the life, (2) prevent excessive power consumption, (3) excessive heat generation As a result, the safety of the lighting device is improved, and the operational stability is improved.

  According to the sixth aspect of the present invention, the power control circuit is configured to supply power smaller than the rated power of the incandescent bulb to be connected when commercial power is input. When a stable voltage is constantly supplied, a power control circuit is configured so that 50% of the power is always supplied to the incandescent bulb when a stable 100V is input. Although it has almost the same brightness as a 50W bulb, the lifespan of the bulb will be dramatically increased by using a 100W bulb with half the power, even if it is the same brightness, rather than using a 50W bulb. (In this example, the calculation is about 90 times), which is a big advantage. This configuration is very effective when it is installed in a place where it is difficult to replace the light bulb or when it is difficult to replace the light bulb in the home of the elderly.

  The incandescent lamp socket according to the present invention provides a constant power supply to the incandescent lamp even if the input voltage fluctuates between the female base for connecting with the incandescent lamp in the housing and the commercial power line. A power control circuit is provided, and an opening is provided between the space in which the circuit is provided in the housing and the space in which the female side base is provided, and the two spaces are separated. Further, the power control circuit includes a rectifying circuit for rectifying a commercial power supply, and a driving circuit for driving a switching element provided between an output and an output terminal of the rectifying circuit to supply electric power to the incandescent bulb. DC smoothing provided with a capacitor (C1) for smoothing the output of the rectifier circuit and generating a voltage corresponding to the voltage value of the commercial power supply between the terminals A soft start circuit including a current mirror, a current mirror that gradually increases the on-time of the switching element at the start of commercial power supply input, and flows a current that is inversely proportional to the voltage value of the capacitor (C1); The capacitor (C3) whose charging time depends on the current and a comparator for comparing the terminal voltage of the capacitor (C3) with a reference voltage, and the switching when the terminal voltage of the capacitor (C3) exceeds the reference voltage It is characterized by comprising a timing circuit for turning on the element and a discharge circuit for surely discharging the electric charge charged in the capacitor (C3) for each half wavelength of the rectified wave. Hereinafter, a detailed description will be given with reference to the drawings.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is composed of (a) a longitudinal sectional view showing the shape of an incandescent lamp socket 10 according to the present invention, and (b) and (c) views each showing a transverse sectional view of each part. As shown in FIG. 1, the incandescent lamp socket 10 of the present invention is configured by roughly dividing a housing 11 into two spaces. One is a board arrangement space 12 in which a circuit board 14 on which a power control circuit to be described later is mounted is arranged, and the other is a female side base arrangement space 13 in which a female side base 15 is arranged. An opening 16 is provided between these two spaces. As can be seen from the cross-sectional view taken along the broken line b shown in FIG. 1B, the opening 16 is a cylindrical portion provided in the center. 17 and the connection support portions 18 provided at four locations on the side surface. The wiring from the female side base 15 arranged in the female side base arrangement space 13 is connected to the circuit board 14 through the inside of the cylindrical portion 17, and the wiring from the circuit board 14 is connected to the male side base 19. Further, a plurality of heat radiating plates 20 for facilitating heat radiation from the incandescent bulb are provided on the outer side of the housing 11 in the female side base arrangement space 13 portion to form a heat sink structure.

  As shown in FIG. 2, the housing 11 of the incandescent lamp socket 10 is composed of two members having a vertically divided structure, and a board fixing for fixing the circuit board 14 inside the board arrangement space 12 of the housing 11. Grooves 21 are formed, and female-side base fixing plate grooves 22 are formed inside the female-side base arrangement space 13. In accordance with this, a fixing plate 23 is formed on the female base 15. At the time of assembly, the other housing 11 is overlapped and connected in a state where the circuit board 14 and the female side base 15 are arranged in the groove portions of the one housing 11, respectively. At this time, a screw thread 24 that is spiral when overlapped is formed at a portion where the male base 19 is connected, and the male base 19 is connected thereto.

  Next, a power control circuit mounted on the circuit board 14 will be described with reference to FIG. The power control circuit shown in FIG. 4 is roughly composed of a full-wave rectifier circuit 31, a DC smoothing circuit 32, a soft start circuit 33, a timing circuit 34, a discharge circuit 35, and a drive circuit 36.

  The full-wave rectifier circuit 31 includes diodes D1, D2, D3, and D4. The commercial power source input between the input terminals 26 is input to the full-wave rectifier circuit 31 via the varistor V1 and the fuse 27, and the full-wave rectifier circuit 31 performs full-wave rectification on the AC input, Output between output terminals. The varistor V1 and the fuse 27 are provided for the purpose of circuit protection.

  The DC smoothing circuit 32 is connected between the output terminals after full-wave rectification, and is connected to a commercial power source by a resistor R3 and a capacitor C1 that smooth the divided voltage through two fixed resistors R1 and R2. This is a circuit for obtaining a proportional DC voltage. The DC voltage generated by the DC smoothing circuit 32 is output to the base terminal of the PNP transistor Q1 in the soft start circuit 33.

The soft start circuit 33 is a circuit for realizing a soft start function for preventing an inrush current generated at the start of commercial power input. When the commercial power supply is turned on and the voltage of the capacitor C1 rises, in the circuit constituted by the PNP transistor Q1, the fixed resistor R8, and the PNP transistors Q2 and Q3 constituting the current mirror, I _s = (20V−2 × 0.7V ) / 100kΩ current flows through the collector of Q3. Here, 20V is the voltage of the Zener diode ZD1, and 0.7V is the V _be voltage of the transistor Q3. When the terminal voltage of C1 is low, the collector current of Q3 flows to Q1 through the diode D8. In that case, the capacitor C3, which will be described later, is charged by the current flowing through the fixed resistor R15. As the terminal voltage of C1 increases, the collector current of Q3 passes through D9 and is charged to C3. This means that the time constant gradually decreases. As a result, as the C1 terminal voltage increases, the on-time of the MOSFET 29 gradually increases, realizing soft start.

The timing circuit 34 is a circuit for controlling the on / off timing of the MOSFET 29. Terminal of the capacitor C3 connected between the reference voltage created by the resistance voltage division of the two fixed resistors R11 and R13 connected between the DC output terminals of the full-wave rectifier circuit 31, and the output terminal of the diode D9 and the ground. The voltages are compared in the comparator 28, and when the terminal voltage reaches the reference voltage, a trigger signal is given to the gate terminal of the MOSFET 29 to turn on the MOSFET 29.
Further, if the temperature inside the socket rises due to the heat generated by the incandescent bulb, there is a risk of damaging the electronic components. However, when the thermistor T2 is connected in series with the fixed resistor R15, Therefore, the time constant is increased, and as a result, the on-time of the MOSFET 29 is shortened and the power of the incandescent bulb is automatically reduced to suppress the temperature rise.

  The discharge circuit 35 is a circuit for reliably turning off the MOSFET 29. When full-wave rectification is performed as in the present invention, if the load is small, the voltage may not drop to 0V. In such a situation, it is difficult to discharge the charge of the capacitor C3 of the timing circuit 34. Can't turn off. In order to avoid this situation, when the voltage of the full-wave rectifier circuit 31 decreases, the NPN transistor Q5 is turned off and the NPN transistor Q6 is turned on, thereby discharging the charge of C3. As a result, the output of the comparator is low when the terminal voltage of C3 falls below the reference voltage created by the resistance voltage division of the two fixed resistors R11 and R13 connected between the DC output terminals of the full-wave rectifier circuit 31. Thus, the MOSFET 29 is turned off.

  The drive circuit 36 is for controlling the power applied to the illumination load. The drive unit is configured by a MOSFET 29 connected in series with a lighting load connected between DC output terminals obtained by full-wave rectification of a commercial power supply, and is driven by controlling the on-time of the MOSFET 29 by the timing circuit 34. Thus, the power applied to the lighting load is controlled to be constant.

  The operation of the power control circuit in such a configuration will be described by taking as an example a case where the rated voltage of the commercial power supply is 220V. When the input of the commercial power supply as shown in FIG. 5A is started between the input terminals 26 of the commercial power supply, the capacitor C1 of the DC smoothing circuit 32 starts to be charged. When the terminal voltage of C1 is low, the collector current of the PNP transistor Q3 flows through the diode D8 to the PNP transistor Q1, and charging of the capacitor C3 at this time is performed by the current flowing through the fixed resistor R15. Since charging by the current flowing through the fixed resistor R15 has a large time constant, it takes time until the terminal voltage of C1 becomes equal to or higher than the reference voltage, and the MOSFET 29 is delayed to be turned on. As a result, the on time is very short. Thereafter, as the terminal voltage of C1 rises, the collector current of Q3 starts to be charged to C3 through D9. This means that the time constant gradually decreases, and as a result, the on-time of the MOSFET 29 gradually increases as the C1 terminal voltage rises, thereby realizing soft start.

  After a while since the commercial power supply is applied, the capacitor C3 is charged almost by the current passing through the diode D9. In this case, after the MOSFET 29 is turned off, the MOSFET 29 starts from the rise of the next full-wave rectification waveform. Since the time until is turned on is very short, a substantially sinusoidal voltage as shown in FIG. 5B is supplied to the output terminal. In FIG. 5B, the state from the rise of the full-wave rectified waveform until the MOSFET 29 is turned on is omitted.

  Here, when the input voltage fluctuates and becomes larger than the rated value, for example, when a 300V input voltage as shown in FIG. The voltage of the capacitor C1 increases. When the terminal voltage of C1 rises, the voltage at the emitter terminal of the PNP transistor Q1 increases, whereby the voltage applied to the fixed resistor R8 decreases and the current flowing through R8 also decreases. Here, since the PNP transistors Q2 and Q3 form a current mirror, when the current flowing through R8 decreases, the current flowing through the diode D9 also decreases. Since the capacitor C3 is charged by the current flowing through D9, the time taken to charge C3 increases as the current decreases. As a result, since the terminal voltage of C3 in the comparator 28 exceeds the reference voltage later, the on-time of the MOSFET 29 is shortened, and the MOSFET 29 is turned on from the rise of the full-wave rectified waveform as shown in FIG. A waveform lacking a portion up to is supplied between the output terminals 30.

  As can be seen from the waveform shown in FIG. 5 (d), when a high voltage is input, the MOSFET 29 is turned on late and the on-time is shortened. Therefore, even when a high voltage is input. The power supplied to the incandescent bulb is substantially the same as that at the rated voltage (the integrated area of the waveform is substantially the same), so that stable power supply can be performed. As described above, the power control circuit in the present invention monitors the voltage fluctuation of the commercial power supply in the capacitor C1, and changes the amount of current flowing from the current mirror to the capacitor C3 via the diode D9 according to the terminal voltage of C1. By controlling the charging time and adjusting the ON time of the MOSFET 29, the incandescent bulb can be supplied with substantially the same power as that at the rated voltage even if there is a voltage fluctuation.

Thus, the incandescent lamp socket according to the present invention is provided with a power control circuit capable of supplying substantially the same power as that at the rated voltage to the incandescent lamp even when there is a voltage fluctuation, and as shown in FIG. Since the opening 16 is provided between the board placement space 12 where the circuit board 14 is placed and the female side mouth placement space 13 where the female base 15 is placed, the power can be kept constant even when a high voltage is input. Therefore, it is possible to suppress the temperature rise of the incandescent light bulb to prevent the bulb from breaking or bursting, and to be able to be used during the rated lifetime, and to provide a heat sink structure including an opening 16 and a plurality of heat sinks 20. By adopting, it becomes difficult for the heat generated by the incandescent bulb to be transmitted to the circuit board 14, and it is possible to prevent the circuit element from becoming unstable due to a temperature rise.
The incandescent lamp socket according to the present invention can realize a stable operation with very little variation in dimming accuracy due to variations in elements and temperature variations as compared with the case of using a conventional diac.

  The incandescent light bulb socket according to the first embodiment was configured by mounting the power control circuit shown in FIG. 4 on the circuit board 14, but a part of the power control circuit of FIG. Also good.

  FIG. 7 is a circuit diagram showing the configuration of the power control circuit when the control IC 37 is employed. The circuit shown in FIG. 7 has the same configuration as the circuit shown in FIG. 4 with respect to the full-wave rectifier circuit (31), the DC smoothing circuit (32), and the drive circuit (36). The configuration of the start circuit 33, the timing circuit 34, and the discharge circuit 35 is integrated into a control IC 37.

  The configuration of the control IC 37 will be described with reference to the block diagram shown in FIG. As shown in FIG. 6, the control IC 37 includes a PowerON detection circuit 38, a VI conversion circuit 39, an ON / OFF time ratio control circuit 40, a power MOSFET drive circuit 42, a low voltage detection circuit 43, and a temperature sensor. The circuit 44 is configured. The V-I conversion circuit 39 is connected to a high-precision and temperature-compensation type external reference current setting resistor 46, and the ON / OFF time ratio control circuit 40 has a high-precision and temperature-compensation type outside. The attached time ratio setting capacitor 41 is connected, and the temperature sensor circuit 44 is connected with an external temperature setting resistor 45 of high accuracy and temperature compensation type.

  Next, the operation of the circuit using the control IC 37 will be described using the timing charts of the respective parts shown in FIGS. As shown in FIG. 8A, when the AC input voltage rises, this is detected by the PowerON detection circuit 38 and the soft start signal shown in FIG. 8B is output to the ON / OFF time ratio control circuit 40. To do. In the ON / OFF time ratio control circuit 40, the soft start signal is received and the time ratio is set to gradually increase from 0% to 100%. Based on this, the power MOSFET drive circuit 42 triggers the gate terminal of the MOSFET 29. Output a signal. As a result, as shown in FIG. 8C, the MOSFET 29 is driven so that the pulse width gradually increases and the on-time becomes longer. This soft start period is set to at least 1 second.

  Here, as shown in FIG. 8 (a), when the input voltage rises to 300V due to voltage fluctuation, the ON / OFF time ratio control circuit 40 sets the voltage value so that the power supplied to the load is constant. The duty ratio is controlled according to. The transition time here is 0.1 seconds or less. When the voltage returns to the rated voltage of 220V, the time ratio is returned to approximately 100% after a transition time of 0.1 seconds or less.

  The temperature sensor circuit 44 detects the current temperature condition of the substrate using the temperature setting resistor 45 and, when the temperature is high, instructs the ON / OFF time ratio control circuit 40 to limit the ON time. Output a signal. As shown in FIGS. 8D and 8E, the power supplied to the incandescent bulb is reduced by narrowing the width of the gate pulse output to the gate terminal of the MOSFET 29 in accordance with the temperature rise detected by the temperature sensor circuit 44. Limit to prevent temperature rise. If the temperature drops after a certain period of time, the original time ratio is restored accordingly.

  Next, control in time units corresponding to half waves of the full-wave rectified waveform shown in FIG. 9A will be described. First, when the full-wave rectified voltage reaches a certain value (for example, 50 V), the voltage VDD for driving the control IC 37 rises. In response to this, a current inversely proportional to the voltage value is supplied to the duty ratio setting capacitor 41, and charging is started as shown in FIG. 9 (d). When the rated voltage is 220 V, charging proceeds in a short period of time, and when the voltage value of the time ratio setting capacitor 41 exceeds the reference voltage (threshold voltage), the ON / OFF time time ratio control circuit 40 detects the time. As shown in FIG. 9E, the gate pulse is raised. This gate pulse is maintained until the full-wave rectified voltage becomes a certain value (for example, 50 V) or less. When the voltage after full-wave rectification is driven by the power MOSFET drive circuit 42 based on this gate pulse, a waveform having substantially the same waveform as the input waveform is obtained as shown in the upper waveform of FIG. Further, when the voltage becomes a certain value (for example, 40 V) or less, this is detected by the low voltage detection circuit 43, and the discharge pulse shown in FIG. The ratio setting capacitor 41 is reliably discharged.

  In the case of a high voltage of 300 V, since the current decreases compared to the rated voltage of 220 V, the charging proceeds slowly. Therefore, as shown in FIG. 9D, the voltage value of the time ratio setting capacitor 41 is the reference voltage. It takes time to reach (threshold voltage). As a result, as shown in FIG. 9E, the ON / OFF time ratio control circuit 40 is controlled so that the pulse width is narrower than that in the case of the rated 220V. When the power MOSFET drive circuit 42 drives the voltage after full-wave rectification based on this gate pulse, a waveform lacking the first half is output as shown in the lower waveform of FIG. By such control, it is possible to supply electric power that is substantially the same as that at the rated voltage (the integrated area of the waveform is substantially the same).

  As described above, by adopting the control IC 37 and configuring the power control circuit, the scale of the circuit board 14 can be reduced, so that the board arrangement space 12 can be made smaller. Miniaturization of the entire bulb socket can be realized.

  In the first and second embodiments, the description has been made on the assumption that the voltage is used in an unstable region. However, the present invention is not limited to such a use environment, and a stable voltage as in Japan. There is a merit to use even when always supplied.

  Specifically, each element (especially each element for controlling the amount of current flowing through the capacitors C3 and C3) is selected so that the on-time of the MOSFET 29 is 50% when a voltage of 100 V is input. Then, the circuit of FIG. 4 is configured, and for example, a 100 W bulb is selected as the incandescent bulb. In such a configuration, when a stable 100V is input, 50% of power is always supplied to the incandescent bulb. In this case, the 100W bulb is lit with approximately the same brightness as the 50W bulb. To do.

  In this way, when a 100W bulb is used with half the power, the life of the bulb is drastically increased. Therefore, even with the same brightness, there is a greater advantage than using a 50W bulb. Specifically, the voltage when the on-time is set to 50% seems to be about 70.1 V, and it can be seen that the life is extended about 90 times when calculated by the above equation (1) based on this. This is a very effective method of use when it is installed in a place where it is difficult to replace the light bulb or when replacement work is difficult in the home of the elderly.

  When used in a place where a stable voltage is always supplied as in Japan, it is not necessary to monitor the voltage as in the circuit of FIG. It is good also as a structure which supplies the electric current which becomes time with respect to the capacitor | condenser C3, and is not limited to the circuit of FIG.

  In the first embodiment, as shown in FIG. 1, the substrate placement space 12 is configured such that the portion other than the cylindrical portion 17 is sealed, but the present invention is not limited to this. For example, as shown in FIG. 3A, a heat radiation window 25 may be provided on each of the portion facing the opening 16 of the substrate arrangement space 12 and the side facing the male base 19. With such a configuration, air is circulated through the board arrangement space 12 and natural air cooling is performed, so that the effect of preventing the temperature rise of the circuit board 14 is further enhanced.

  Also, as shown in FIG. 3B, instead of eliminating the opening 16 in FIG. 1, the side of the housing 11 is provided with a plurality of heat radiation windows 25 and the side of the housing 11 facing the male base 19. Alternatively, a heat dissipation window 25 may be provided. Also in this case, as in the case of FIG. 3A, since air is circulated through the inside of the board arrangement space 12 and natural air cooling is performed, the effect of preventing the temperature rise of the circuit board 14 is further enhanced.

  In the said Example, as shown in FIG. 1 thru | or FIG. 3, the male side nozzle | cap | die 19 is provided, and this is comprised in this way supposing using the socket for the incandescent lamp of this invention in the existing installation. is doing. However, the present invention is not limited to this, and the power control circuit of the present invention is provided inside a socket fixedly installed in a building or the like, and the power control circuit is directly connected to a commercial power line. It may be.

  In the above embodiment, the MOSFET 29 is provided on the line for supplying the commercial power source to the incandescent light bulb, and the power supplied by the switching operation of the MOSFET 29 is kept constant. However, the present invention is not limited to this. Other switching elements may be used as long as the same switching operation is realized.

  In the above embodiment, the full-wave rectifier circuit 31 is used as a circuit for rectifying the commercial power supply. However, the present invention is not limited to this, and a half-wave rectifier circuit is used instead of the full-wave rectifier circuit. Even if it does, the same effect can be acquired and it is included in the scope of the present invention.

(A) is a longitudinal sectional view showing the shape of an incandescent lamp socket according to the present invention, (b) is a transverse sectional view taken along a broken line b in (a), and (c) is a broken line c in (a). FIG. It is the longitudinal cross-sectional view showing the state before the assembly of the socket for incandescent lamps by this invention. (A), (b) is the longitudinal cross-sectional view showing the other Example of the shape of the socket for incandescent lamps by this invention, respectively. It is a circuit diagram showing the structure of the power control circuit employ | adopted as the socket for incandescent lamps by this invention. It is a waveform diagram showing the waveform input to the power control circuit and the output waveform after passing through the circuit. 3 is a block diagram showing functions of a control IC 37. FIG. It is a circuit diagram showing the structure of the power control circuit at the time of employ | adopting control IC37. It is a timing chart figure showing the appearance of the waveform of each part controlled in control IC37. It is a timing chart figure showing the appearance of the waveform of each part controlled in control IC37. It is a circuit diagram showing the structure of the conventional dimmer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Incandescent bulb socket, 11 ... Housing, 12 ... Board placement space, 13 ... Female side base placement space, 14 ... Circuit board, 15 ... Female side base, 16 ... Opening, 17 ... Cylindrical part, 18 ... Connection support , 19 ... Male side base, 20 ... Radiation plate, 21 ... Substrate fixing groove, 22 ... Female side base fixing plate groove, 23 ... Fixing plate, 24 ... Thread, 25 ... Radiation window, 26 ... Input terminal 27 ... Fuse, 28 ... Comparator, 29 ... MOSFET, 30 ... Output terminal, 31 ... Full wave rectifier circuit, 32 ... DC smoothing circuit, 33 ... Soft start circuit, 34 ... Timing circuit, 35 ... Discharge circuit, 36 ... Drive circuit, 37 ... Control IC, 38 ... PowerON detection circuit, 39 ... VI conversion circuit, 40 ... ON / OFF time ratio control circuit, 41 ... Time ratio setting capacitor, 42 ... Power OSFET drive circuit, 43 ... low voltage detection circuit, 44 ... temperature sensor circuit, 45 ... temperature setting resistor, 46 ... reference current setting resistor, R1-R18 ... fixed resistor, C1-C4 ... capacitor, D1-D9 ... diode, Q1 ~ Q6 ... transistor, ZD1, ZD2 ... zener diode, T1, T2 ... thermistor, V1 ... varistor.

Claims (6)

  An incandescent bulb socket that can supply a constant amount of power to the incandescent bulb even if the input voltage fluctuates between the female base for connecting to the incandescent bulb in the housing and the commercial power line. An incandescent bulb socket characterized by a power control circuit.   An incandescent bulb socket that can supply a constant amount of power to the incandescent bulb even if the input voltage fluctuates between the female base for connecting to the incandescent bulb in the housing and the commercial power line. An incandescent lamp characterized by comprising a power control circuit and a space in the housing in which the circuit is provided and a space in which the female side cap is provided, with an opening provided between the two spaces. Socket.   The power control circuit monitors the voltage value of the commercial power supply, and when a voltage larger than a voltage value assumed in advance is input, the on-time of the switching element provided on the line for supplying the commercial power supply to the incandescent bulb The incandescent light bulb socket according to claim 1 or 2, further comprising a function of controlling the power supply to keep the supplied power constant.   The power control circuit includes a rectifier circuit for rectifying a commercial power supply, a drive circuit for driving a switching element provided between an output and an output terminal of the rectifier circuit to supply electric power to an incandescent bulb, and the rectifier circuit DC smoothing circuit having a capacitor (C1) for smoothing the output and generating a voltage corresponding to the voltage value of the commercial power supply between the terminals, and gradually increasing the ON time of the switching element at the start of the commercial power supply input And a soft start circuit having a current mirror for passing a current inversely proportional to the voltage value of the capacitor (C1), a capacitor (C3) whose charging time depends on the current from the current mirror, and the capacitor (C3) A comparator that compares the terminal voltage of the capacitor and the reference voltage, and the terminal voltage of the capacitor (C3) exceeds the reference voltage 2. A timing circuit for turning on the switching element, and a discharge circuit for reliably discharging the charge charged in the capacitor (C3) for each half wavelength of the rectified wave. Or the socket for incandescent lamps of 2 description.   A thermistor is connected between the output of the rectifier circuit and the capacitor (C3), and the resistance value increases as the circuit temperature rises, so that the charging time of the capacitor (C3) increases. The incandescent lamp socket according to claim 4.   6. The incandescent light bulb socket according to claim 1, wherein the power control circuit is configured to supply power smaller than a rated power of an incandescent light bulb to be connected when a commercial power supply is input. .

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