CN214125152U - High-side current sampling device of direct-current power supply with wide voltage range - Google Patents
High-side current sampling device of direct-current power supply with wide voltage range Download PDFInfo
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- CN214125152U CN214125152U CN202023169863.1U CN202023169863U CN214125152U CN 214125152 U CN214125152 U CN 214125152U CN 202023169863 U CN202023169863 U CN 202023169863U CN 214125152 U CN214125152 U CN 214125152U
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Abstract
The utility model discloses a high-side current sampling device of a direct current power supply with a wide voltage range, which comprises a sampling element electrically connected with the positive end of a power supply, wherein the output end of the sampling element is connected in series with a load, the load is electrically connected to the negative end of the power supply, the negative end of the power supply is grounded and is connected with a photoelectric isolation device, the output end of the photoelectric isolation device is connected with a signal processing device and also comprises an isolation processing control power supply; the sampling element is connected to the positive end of a power supply, the problems of application range and reliability of high-side current sampling are solved by using the photoelectric isolation device, although a sampling signal is limited by the photoelectric isolation device, the voltage resistance of the photoelectric isolation device is high, so that the device is hardly limited by any voltage when used in conventional circuit board sampling, and meanwhile, the device is also suitable for a negative voltage end current sampling scene at the positive end in a controlled manner, and the circuit debugging of the device is simple.
Description
Technical Field
The utility model relates to a current sampling technical field, concretely relates to high limit current sampling device of DC power supply of wide voltage range, especially, be fit for the power product and use, like switching power supply, UPS, the lithium cell, the AC-DC conversion module, the power supply that steps up, the differentiation is equipped with electrical equipment, intelligent distribution equipment etc., also can use on electric power distribution detection monitoring product, like the ammeter, intelligent monitoring facility etc., all can generally use in other electric power equipment that need high limit current sampling in electric power field, in emerging new forms of energy field like solar energy, wind energy, new energy automobile, hybrid vehicle, electric automobile and relevant various supporting power equipment such as electric pile that fill also can use.
Background
Current sampling is one of the inevitable problems faced by many electrical and electronic devices, and dc current sampling can theoretically be performed at both the negative output (or input) and the positive output (or input) of a dc power supply. However, in practice there is a large difference between current sampling at the positive terminal and current sampling at the negative terminal. When current sampling is performed at the negative end (low side), a milliohm resistor (shunt) can be used for directly collecting a voltage signal on the resistor, and the voltage signal can be used for a subsequent circuit after signal amplification (shown in fig. 5); when sampling is performed at the positive end (high side), there is a certain limitation to directly amplify the current signal, that is, the voltage at the sampling position cannot be higher than the common-mode input voltage of the amplifier, otherwise the normal operation of the amplifier is affected, even the amplifier is damaged, and a special amplifier with high common-mode input voltage needs to be selected. The maximum common-mode input voltage of the special amplifier reaches 62V at present, and the special amplifier can be suitable for high-side current sampling of voltage levels below 48V. For sampling the high-side current higher than 62V voltage, if the current divider is still used for current detection, only the current mirror method can be used at present to convert the high-side current sampling signal into the low-side voltage signal, and then normal amplification is performed. The current mirror method makes it possible to use a milliohm resistor (shunt) and a common amplifier for high-side current sampling, and also makes engineers unnecessary to use expensive hall current sensors. However, the current mirror method still has its limitations, mainly due to the voltage endurance problem of the circuit. Generally, a current mirror is composed of two interconnected transistors and a resistor, wherein the voltage endurance of the transistor determines the voltage of the high-side current sampling device. The low-power triode is limited by the structural characteristics of the triode, the withstand voltage of the triode is not high, and the characteristic of the triode with high withstand voltage is much poorer than that of the triode with lower voltage. In addition, the current mirror sampling method is not isolated on the circuit, once the triode is damaged and short-circuited, the connected subsequent elements are also damaged by high voltage breakdown, so that the current mirror method is difficult to be safely and reliably adopted on a high voltage device.
Usually, a circuit design engineer does not choose the high-side current sampling method without reason because the high common-mode input voltage problem caused by the high-side current sampling method restricts the application of the sampling method. However, in some application scenarios, such as applications in which the primary and secondary sides of the boost circuit, buck step-down circuit, buck-boost step-down circuit, etc. are not isolated (as shown in fig. 6), because the primary and secondary sides of the power supply share the ground, the high-side current sampling method can greatly simplify the complexity of the power supply power circuit, simplify the control circuit, and accordingly reduce the product cost. The new energy power conversion device mostly adopts the non-isolated circuit topological structure, so that the high-side current sampling device which is wide in application range, low in cost and convenient to use has a wider space in the application of the fields of future power conversion and the like. The current common practical method for sampling the high-side current comprises the following steps: a Hall current sensor sampling method, a shunt + current mirror sampling method, a special high-side current sampling IC, and a shunt + linear optocoupler sampling method.
The hall current sensor sampling method (as shown in fig. 7 and 8) is a current sampling device that senses a change in a current magnetic field using a hall element sensitive to an electromagnetic field, generates a corresponding electrical signal, and amplifies the electrical signal by an integrated amplifier circuit to output a voltage corresponding to the current signal. The method has no limitation of high and low edge sampling points, and can be widely applied to various alternating current and direct current power transmission and distribution occasions. However, due to the disadvantages of high price, high power consumption, poor consistency, low sensitivity and poor temperature characteristics, the sensor is rarely applied to the field of precision measurement, and has great limitation on PCB board-level application, especially in places with large magnetic field intensity variation, the stability and reliability of Hall devices are more considered; the shunt + current mirror sampling method is a practical high-side current sampling method, but because triodes or MOS tubes used by a current mirror have the limitation on withstand voltage, the sampling precision of the method is not high, so that the method is greatly limited in the application of occasions with higher voltage and higher precision requirements; the core of the special high-side current sampling IC is also a current mirror method, but a more complex circuit is integrated. The main problem is that the common-mode input voltage of the existing products is not high, most of the common-mode input voltage is 28V grade, and the few common-mode input voltages can reach 62V, so that the common-mode input voltage can only be applied to systems of 24V and 48V; the current divider and linear optocoupler sampling method is suitable for various voltage grades, however, the core of the circuit is an expensive linear optocoupler, signals need to be amplified firstly at a sampling end and then input into the linear optocoupler, and an additional auxiliary power supply is needed at the sampling end, so that the circuit is high in cost, complex and few in application.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a wide voltage range's of wide, with low costs, simple structure, convenient to use, stability height of adaptation face is provided, can use and can satisfy various electric current sampling application demands direct current power supply high side current sampling device in complicated electromagnetic environment.
In order to solve the technical problem, the technical scheme of the utility model is that: the utility model provides a wide voltage range's DC power supply high side current sampling device, includes the sampling component of being connected with power supply's positive terminal electricity, the output of sampling component is established ties there is the load, the load electricity is connected to power supply's negative terminal, just power supply's negative terminal ground connection sets up, with the sampling component is equipped with photoelectric isolation device relatively, photoelectric isolation device electricity is connected to the both ends of sampling component, photoelectric isolation device's output is connected with signal processing apparatus, still includes isolation processing control power supply, isolation processing control power supply electricity is connected to respectively photoelectric isolation device with signal processing apparatus.
Preferably, the sampling element is set as a milliohm-level sampling resistor Rs or a shunt.
As a preferable technical solution, the optoelectronic isolation device includes a first photocoupler U1 and a second photocoupler U2 which are arranged in parallel, the first photocoupler U1 and the second photocoupler U2 are respectively provided with four pins, including an optical end input pin and an optical end output pin which form optical signals and are arranged oppositely, and a control power input pin and an electrical signal output pin which form electrical signals and are arranged oppositely;
the first photoelectric coupler U1 and the second photoelectric coupler U2 are independently arranged or the first photoelectric coupler U1 and the second photoelectric coupler U2 are integrally packaged;
the isolation processing control power supply is set to be a positive control power supply VCC and a negative control power supply-VCC.
As a preferred technical solution, the first photocoupler U1 and the second photocoupler U2 respectively include a light emitting diode and a phototriode, which are packaged, an anode of the light emitting diode is electrically connected to the optical input pin, a cathode of the light emitting diode is electrically connected to the optical output pin, a collector of the phototriode is electrically connected to the control power input pin, and an emitter of the phototriode is electrically connected to the electrical signal output pin.
As a preferable technical solution, in the first photocoupler U1, the optical terminal input pin is electrically connected to the input terminal of the sampling resistor Rs, and a limiting resistor R1 is connected in series between the optical terminal input pin and the sampling resistor Rs, the optical terminal output pin is grounded, the control power supply input pin is electrically connected to the positive control power supply VCC, the electrical signal output pin is electrically connected to the signal processing device, and the electrical signal output pin is also grounded through a resistor R3;
in the second photocoupler U2, the optical end input pin is electrically connected to the output end of the sampling resistor Rs, a limiting resistor R2 is connected in series between the optical end input pin and the sampling resistor Rs, the optical end output pin is grounded, the control power input pin is electrically connected to the positive control power VCC, the electrical signal output pin is electrically connected to the signal processing device, and the electrical signal output pin is also grounded through a resistor R4.
As a preferable technical solution, the optical terminal input pin of the first photocoupler U1 is electrically connected to the input terminal of the sampling resistor Rs, a limiting resistor R1 is connected in series between the optical terminal input pin and the sampling resistor Rs, the optical terminal output pin is grounded, the control power supply input pin is electrically connected to the positive control power supply VCC through a resistor R11, and the control power supply input pin is also electrically connected to the signal processing device;
the optical end input pin of the second photocoupler U2 is electrically connected to the output end of the sampling resistor Rs, a limiting resistor R2 is connected in series between the optical end input pin and the sampling resistor Rs, the optical end output pin is grounded, the control power supply input pin is electrically connected to the positive control power supply VCC through a resistor R12, and the control power supply input pin is also electrically connected to the signal processing device;
the electric signal output pin on the first photoelectric coupler U1 and the electric signal output pin on the second photoelectric coupler U2 are connected to two fixed ends of a potentiometer R9 respectively, and the sliding end of the potentiometer R9 is electrically connected to the negative control power supply-VCC through a resistor R10.
Preferably, the signal processing apparatus includes an amplifier U3 electrically connected to the isolation processing control power supply, a non-inverting input terminal of the amplifier U3 is connected to the first photocoupler U1 through a resistor R5, a ground is further provided between the non-inverting input terminal of the amplifier U3 and the resistor R5 through a resistor R7, an inverting input terminal of the amplifier U3 is connected to the second photocoupler U2 through a resistor R6, and a resistor R8 is connected in series between the inverting input terminal of the amplifier U3 and an output terminal of the amplifier U3.
Preferably, the amplifier U3 is configured as a one-stage amplifier including an integrated operational amplifier chip or as a multi-stage amplifier including a plurality of electrical connections of the integrated operational amplifier chip.
As a preferred technical solution, a positive power supply terminal of the amplifier U3 is electrically connected to the positive control power supply VCC.
As an improvement to the above technical solution, a negative power supply terminal of the amplifier U3 is electrically connected to the negative control power supply-VCC.
Due to the adoption of the technical scheme, the high-side current sampling device of the direct-current power supply with the wide voltage range comprises a sampling element electrically connected with the positive end of a power supply, the output end of the sampling element is connected with a load in series, the load is electrically connected to the negative end of the power supply, the negative end of the power supply is grounded, a photoelectric isolation device is arranged opposite to the sampling element and is electrically connected to the two ends of the sampling element, the output end of the photoelectric isolation device is connected with a signal processing device, and the sampling device further comprises an isolation processing control power supply, and the isolation processing control power supply is electrically connected to the photoelectric isolation device and the signal processing device respectively; the utility model discloses following beneficial effect has: the sampling element is connected to the positive end of a power supply, so that high-side signal sampling of the circuit is realized, the problems of application range and reliability of high-side current sampling are solved by using the photoelectric isolation device, and although the sampling signal is limited by the photoelectric isolation device, the voltage resistance of the photoelectric isolation device is high, so that the device is hardly limited by any voltage when used in conventional circuit board sampling and is also suitable for a negative voltage end current sampling scene at the positive end in a controlled manner; the device has simple circuit debugging, and can realize high-side current conversion by adjusting the input resistance of the photoelectric isolation device to work in an amplification state.
Drawings
The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:
fig. 1 is a schematic circuit diagram of a first embodiment of the present invention;
FIG. 2 is a waveform diagram of four current paths used in a circuit test according to an embodiment of the present invention;
fig. 3 is a diagram of a corresponding voltage waveform formed by sampling each current path in fig. 2 according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a second embodiment of the present invention;
FIG. 5 is a schematic of a circuit commonly used in the prior art for current sampling at the negative (low) side;
FIG. 6 is a schematic diagram of sample points of a boost converter boost in the prior art;
FIG. 7 is a schematic diagram of a circuit involved in a Hall current sensor sampling method in the prior art;
fig. 8 is another circuit schematic involved in the hall current sensor sampling method of the prior art.
Detailed Description
The invention is further explained below with reference to the drawings and examples. In the following detailed description, certain exemplary embodiments of the present invention have been described by way of illustration only. Needless to say, a person skilled in the art will recognize that the described embodiments can be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.
The first embodiment is as follows:
as shown in fig. 1, a high-side current sampling device of a dc power supply with a wide voltage range comprises a sampling element electrically connected to the positive terminal of a power supply Vin, wherein the sampling element is configured as a milliohm sampling resistor Rs or a shunt, and the milliohm sampling resistor Rs is used in the embodiment. The output end of the sampling element is connected in series with a load RL, the load RL is electrically connected to the negative end of the power supply Vin, the negative end of the power supply Vin is grounded, a photoelectric isolation device is arranged opposite to the sampling element and is electrically connected to the two ends of the sampling element, the output end of the photoelectric isolation device is connected with a signal processing device, the sampling device further comprises an isolation processing control power supply, the isolation processing control power supply is electrically connected to the photoelectric isolation device and the signal processing device respectively, and the isolation processing control power supply is set to be a positive control power supply VCC and a negative control power supply VCC. The core of the embodiment is that the voltage at two ends of the sampling resistor Rs which is connected in series with the positive end of the power supply main loop is collected and coupled to the control and signal end of the power supply through the photoelectric isolation device at the positive end (high side) of the direct current power supply, the circuit arrangement of the whole device is simple, no special electronic device is needed, and the high side current accurate sampling which can be applied under any voltage is realized by utilizing the conventional electronic device.
Specifically, the photoelectric isolation device comprises two electric couplers arranged in parallel, namely a first photoelectric coupler U1 and a second photoelectric coupler U2, wherein the first photoelectric coupler U1 and the second photoelectric coupler U2 are respectively provided with four pins, and the four pins comprise an optical end input pin and an optical end output pin which form optical signals and are arranged oppositely, and a control power supply input pin and an electric signal output pin which form electric signals and are arranged oppositely. The first photocoupler U1 and the second photocoupler U2 are independently arranged or the first photocoupler U1 and the second photocoupler U2 are integrally packaged. And the first photoelectric coupler U1 and the second photoelectric coupler U2 are products of the same model and the same batch as much as possible, so that the consistency of the performances of the two sampling devices is ensured.
The first photocoupler U1 and the second photocoupler U2 respectively comprise a light emitting diode and a phototriode which are arranged in a packaging mode, the anode of the light emitting diode is electrically connected to the light end input pin, the cathode of the light emitting diode is electrically connected to the light end output pin, the collector of the phototriode is electrically connected to the control power supply input pin, and the emitter of the phototriode is electrically connected to the electric signal output pin. The phototriode is an NPN type phototriode and is matched with the light emitting diode to realize the electrical isolation of circuits on two sides.
In this embodiment, the optical terminal input pin of the first photocoupler U1 is electrically connected to the input terminal of the sampling resistor Rs, and a limiting resistor R1, the optical terminal output pin is grounded, the control power input pin is electrically connected to the positive control power VCC, the electrical signal output pin is electrically connected to the signal processing device, and the electrical signal output pin is also grounded through a resistor R3, are connected in series between the optical terminal input pin and the sampling resistor Rs; in the second photocoupler U2, the optical end input pin is electrically connected to the output end of the sampling resistor Rs, a limiting resistor R2 is connected in series between the optical end input pin and the sampling resistor Rs, the optical end output pin is grounded, the control power input pin is electrically connected to the positive control power VCC, the electrical signal output pin is electrically connected to the signal processing device, and the electrical signal output pin is also grounded through a resistor R4.
The sampling resistor Rs and the load RL are connected in series between the positive end and the negative end of the power supply Vin to form a power loop, a voltage Vs + is formed at the input end of the sampling resistor Rs, a voltage Vs-is formed at the output end of the sampling resistor Rs, the limiting resistor R1 and the limiting resistor R2 have the function of protecting the first photoelectric coupler U1 and the second photoelectric coupler U2, and when the photoelectric coupler is actually designed or used, the resistance values of the limiting resistor R1 and the limiting resistor R2 are finally determined through continuous debugging so that the corresponding photoelectric couplers can work in an amplification area all the time.
The signal processing device comprises an amplifier U3 electrically connected with the isolation processing control power supply, wherein the non-inverting input end of the amplifier U3 is connected to the first photoelectric coupler U1 through a resistor R5, the non-inverting input end of the amplifier U3 and the resistor R5 are grounded through a resistor R7, the inverting input end of the amplifier U3 is connected to the second photoelectric coupler U2 through a resistor R6, and a resistor R8 is connected between the inverting input end of the amplifier U3 and the output end of the amplifier U3 in series.
During the actual operation of the circuit, the NPN phototransistor of the first photocoupler U1 and the resistor R3 form an emitter follower, and the other end of the resistor R3 is connected to other ground such as a power ground or a control ground; similarly, the NPN phototransistor of the second photocoupler U2 and the resistor R4 form an emitter follower, and the other end of the resistor R4 is connected to other ground such as a power ground or a control ground. The collectors of the first photocoupler U1 and the second photocoupler U2 are electrically connected to the positive control power VCC, respectively, so as to couple the high-side sampling signal to the low side or the control side, and form a differential signal, which is then amplified and output by the subsequent signal processing device. In the signal processing device, the resistor R8 is connected with the inverting input terminal and the output terminal of the amplifier U3 to form negative feedback, and the resistor R5, the resistor R6, the resistor R7, the resistor R8 and the amplifier U3 together form a classical differential operational amplifier circuit; the sampling resistor Rs, the limiting resistor R1, the limiting resistor R2, the first photoelectric coupler U1, the second photoelectric coupler U2, the resistor R3 and the resistor R4 jointly complete isolated differential sampling of high-side current.
The positive power supply terminal of the amplifier U3 is electrically connected to the positive control power supply VCC. The negative power supply end of the amplifier U3 can also be electrically connected to the negative control power supply-VCC to improve its response in small signals, if the current sampling quality of small signals is neglected, the positive power supply end of the amplifier U3 can be selected to be electrically connected to the positive control power supply VCC only, or a single power supply can be used for power supply, or a rail-to-rail operational amplifier can be selected. The differential amplifier circuit is adopted in the embodiment to overcome the adverse effects caused by the temperature drift and the linearity change of the optical coupler.
As shown in fig. 2 and fig. 3, which are graphs showing the effect of current sampling in the present embodiment, it can be found by comparison that two groups of waveforms related to the two graphs have a strict correspondence relationship, so that the effectiveness, linearity and response speed of the present embodiment are strongly demonstrated.
Example two:
as shown in fig. 4, the present embodiment is different from the first embodiment in that the optoelectronic isolation device is adjusted. Specifically, the optical terminal input pin of the first photocoupler U1 is electrically connected to the input terminal of the sampling resistor Rs, and a limiting resistor R1, the optical terminal output pin is grounded, the control power input pin is electrically connected to the positive control power VCC through a resistor R11, and the control power input pin is also electrically connected to the signal processing device; the optical end input pin of the second photocoupler U2 is electrically connected to the output end of the sampling resistor Rs, a limiting resistor R2 is connected in series between the optical end input pin and the sampling resistor Rs, the optical end output pin is grounded, the control power supply input pin is electrically connected to the positive control power supply VCC through a resistor R12, and the control power supply input pin is also electrically connected to the signal processing device; the electric signal output pin on the first photoelectric coupler U1 and the electric signal output pin on the second photoelectric coupler U2 are connected to two fixed ends of a potentiometer R9 respectively, the sliding end of the potentiometer R9 is electrically connected to the negative control power supply-VCC through a resistor R10, and the potentiometer R9 can adjust the deviation of two sampling signals caused by the discreteness of devices. If the current sampling quality of the small signal is neglected, the amplifier U3 may also be powered by a single power supply, or a rail-to-rail operational amplifier is used, and at this time, the resistor R10 needs to be eliminated, and the sliding end of the potentiometer R9 is directly grounded. The amplifier U3 is configured as a one-stage amplifier comprising an integrated operational amplifier chip or as an electrically connected multi-stage amplifier comprising a plurality of integrated operational amplifier chips.
The utility model discloses a connect the sampling component in the positive end of power supply Vin, realized the high side signal sampling of circuit, utilize photoelectric isolation device to solve high side current sampling's application scope and reliability problem simultaneously, the sampling signal is limited by photoelectric isolation device, but because photoelectric isolation device's withstand voltage is high, therefore the device uses hardly any voltage restriction in conventional circuit board sampling, still is applicable to the negative voltage end current sampling scene at the positive end of control ground simultaneously; the device has simple circuit debugging, and can realize high-side current conversion by adjusting the input resistance of the photoelectric isolation device to work in an amplification state.
The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (10)
1. A high-side current sampling device of a direct current power supply with a wide voltage range comprises a sampling element electrically connected with the positive end of a power supply, the output end of the sampling element is connected with a load in series, the load is electrically connected with the negative end of the power supply, and the negative end of the power supply is arranged in a grounding way, and the high-side current sampling device is characterized in that: the photoelectric isolation device is arranged opposite to the sampling element, the photoelectric isolation device is electrically connected to two ends of the sampling element, the output end of the photoelectric isolation device is connected with a signal processing device, and the photoelectric isolation device further comprises an isolation processing control power supply, and the isolation processing control power supply is electrically connected to the photoelectric isolation device and the signal processing device respectively.
2. The wide voltage range high-side current sampling device of the direct current power supply as claimed in claim 1, wherein: the sampling element is set to a milliohm-scale sampling resistor Rs or a shunt.
3. The wide voltage range high-side current sampling device of the direct current power supply as claimed in claim 2, wherein: the photoelectric isolation device comprises a first photoelectric coupler U1 and a second photoelectric coupler U2 which are arranged in parallel, wherein the first photoelectric coupler U1 and the second photoelectric coupler U2 are respectively provided with four pins, and the four pins comprise an optical end input pin and an optical end output pin which form optical signals and are arranged oppositely, and a control power supply input pin and an electric signal output pin which form electric signals and are arranged oppositely;
the first photoelectric coupler U1 and the second photoelectric coupler U2 are independently arranged or the first photoelectric coupler U1 and the second photoelectric coupler U2 are integrally packaged;
the isolation processing control power supply is set to be a positive control power supply VCC and a negative control power supply-VCC.
4. A wide voltage range dc power supply high side current sampling apparatus as defined in claim 3, wherein: the first photocoupler U1 and the second photocoupler U2 respectively comprise a light emitting diode and a phototriode which are arranged in a packaging mode, the anode of the light emitting diode is electrically connected to the light end input pin, the cathode of the light emitting diode is electrically connected to the light end output pin, the collector of the phototriode is electrically connected to the control power supply input pin, and the emitter of the phototriode is electrically connected to the electric signal output pin.
5. The wide voltage range high-side current sampling device of the direct current power supply of claim 4, wherein: in the first photocoupler U1, the optical end input pin is electrically connected to the input end of the sampling resistor Rs, a limiting resistor R1 is connected in series between the optical end input pin and the sampling resistor Rs, the optical end output pin is grounded, the control power supply input pin is electrically connected to the positive control power supply VCC, the electrical signal output pin is electrically connected to the signal processing device, and the electrical signal output pin is also grounded through a resistor R3;
in the second photocoupler U2, the optical end input pin is electrically connected to the output end of the sampling resistor Rs, a limiting resistor R2 is connected in series between the optical end input pin and the sampling resistor Rs, the optical end output pin is grounded, the control power input pin is electrically connected to the positive control power VCC, the electrical signal output pin is electrically connected to the signal processing device, and the electrical signal output pin is also grounded through a resistor R4.
6. The wide voltage range high-side current sampling device of the direct current power supply of claim 4, wherein: the optical end input pin of the first photocoupler U1 is electrically connected to the input end of the sampling resistor Rs, a limiting resistor R1 is connected in series between the optical end input pin and the sampling resistor Rs, the optical end output pin is grounded, the control power supply input pin is electrically connected to the positive control power supply VCC through a resistor R11, and the control power supply input pin is also electrically connected to the signal processing device;
the optical end input pin of the second photocoupler U2 is electrically connected to the output end of the sampling resistor Rs, a limiting resistor R2 is connected in series between the optical end input pin and the sampling resistor Rs, the optical end output pin is grounded, the control power supply input pin is electrically connected to the positive control power supply VCC through a resistor R12, and the control power supply input pin is also electrically connected to the signal processing device;
the electric signal output pin on the first photoelectric coupler U1 and the electric signal output pin on the second photoelectric coupler U2 are connected to two fixed ends of a potentiometer R9 respectively, and the sliding end of the potentiometer R9 is electrically connected to the negative control power supply-VCC through a resistor R10.
7. The high-side current sampling device of the direct current power supply with the wide voltage range as claimed in claim 5 or 6, wherein: the signal processing device comprises an amplifier U3 electrically connected with the isolation processing control power supply, wherein the non-inverting input end of the amplifier U3 is connected to the first photoelectric coupler U1 through a resistor R5, the non-inverting input end of the amplifier U3 and the resistor R5 are grounded through a resistor R7, the inverting input end of the amplifier U3 is connected to the second photoelectric coupler U2 through a resistor R6, and a resistor R8 is connected between the inverting input end of the amplifier U3 and the output end of the amplifier U3 in series.
8. The wide voltage range high-side current sampling device of the direct current power supply of claim 7, wherein: the amplifier U3 is configured as a one-stage amplifier comprising an integrated operational amplifier chip or as an electrically connected multi-stage amplifier comprising a plurality of integrated operational amplifier chips.
9. The wide voltage range high-side current sampling device of the direct current power supply of claim 7, wherein: the positive power supply terminal of the amplifier U3 is electrically connected to the positive control power supply VCC.
10. The wide voltage range high-side current sampling device of a dc power supply of claim 9, wherein: the negative power supply terminal of the amplifier U3 is electrically connected to the negative control power supply-VCC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023169863.1U CN214125152U (en) | 2020-12-24 | 2020-12-24 | High-side current sampling device of direct-current power supply with wide voltage range |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023169863.1U CN214125152U (en) | 2020-12-24 | 2020-12-24 | High-side current sampling device of direct-current power supply with wide voltage range |
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| CN214125152U true CN214125152U (en) | 2021-09-03 |
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Address after: No. 333, Fengcun Road, Fengxian District, Shanghai, 201414 Patentee after: Shanghai Huijie Technology Group Co.,Ltd. Country or region after: China Address before: No. 333, Fengcun Road, Fengxian District, Shanghai, 201414 Patentee before: SHANGHAI HUIJUE NETWORK COMMUNICATION EQUIPMENT CO.,LTD. Country or region before: China |