CN214335579U - High-voltage-sharing constant-current circuit - Google Patents
High-voltage-sharing constant-current circuit Download PDFInfo
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- CN214335579U CN214335579U CN202120288596.5U CN202120288596U CN214335579U CN 214335579 U CN214335579 U CN 214335579U CN 202120288596 U CN202120288596 U CN 202120288596U CN 214335579 U CN214335579 U CN 214335579U
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Abstract
A high-voltage-sharing constant-current circuit belongs to the technical field of high-voltage direct-current power supply, and how to eliminate the impact phenomenon of instantaneous impact current on a power supply and equipment when a capacitor in the existing direct-current high-voltage power supply system is started in a cold state, and simultaneously improve the working voltage of the circuit; the two power tubes Q1 and the power tube Q2 connected in series are controlled to work in a constant current region at the same time, a reference voltage Vref in the first driving circuit is connected to the non-inverting input end of an operational amplifier, and a current sampling feedback voltage is connected to the inverting input end of the operational amplifier, so that constant current output control is realized, the charging of a capacitor or the slow start of a capacitive load is realized, and the impact current during starting is eliminated; the voltage at two ends of a power tube Q2 in the second driving circuit is divided and then connected to the non-inverting input end of the operational amplifier, and the total voltage between the input and the output is divided and then connected to the inverting input end of the operational amplifier, so that voltage-sharing control of two power tubes Q1 and Q2 is realized; the two power tubes are in voltage-sharing control while the power tube Q1 and the power tube Q2 output constant currents, and the working voltage is improved in a multiplied mode.
Description
Technical Field
The utility model belongs to the technical field of the high voltage direct current power supply, a high pressure voltage-sharing constant current circuit is related to.
Background
In a dc high-voltage power supply system, in order to maintain stable voltage, a large-capacity capacitor is usually connected in parallel at two ends of a load, so as to perform the functions of filtering and energy storage. When the capacitor is started in a cold state, the capacitor is equivalent to a short circuit, and instant impact current can occur to cause impact on a power supply and equipment. At present, two general solutions to this problem exist, one is to connect a resistor and a bypass relay in series in a loop to perform current limiting and switching; one is to realize constant current output by controlling a power tube (MOS tube or IGBT tube) to work in a constant current region. The disadvantages of the two methods are: 1) the current limiting mode of serially connecting a resistor and a relay in a loop needs a high-voltage-resistant relay and a high-power resistor, so that the circuit occupies a large volume and wastes space, and meanwhile, the output current is not controlled and changes along with the change of the differential pressure between input and output. 2) The mode of connecting the power tube in series in the loop can realize constant current output, the output current is controllable, and the total volume of the circuit is small, but the current proposal is single-tube constant current control, because the power tube works in a constant current area, the working voltage of the single-tube constant current is still limited due to the influence of the working power consumption and the safe working area of the power tube.
In the prior art, a chinese utility model patent "constant current module series output voltage-sharing control circuit and constant current output power supply system" with application number 201920368521.0 and publication date of 2019, 11, 12 discloses a constant current module series output voltage-sharing control circuit and a constant current output power supply system, and the constant current module series output voltage-sharing control circuit includes a voltage-sharing control circuit and a constant current control circuit both corresponding to the constant current module. The voltage-sharing control circuit is used for acquiring reference voltage information and output voltage information of the constant current module and outputting a constant current control reference signal to the constant current control circuit according to the output voltage information and the reference voltage information. The constant current control circuit is used for acquiring a constant current control reference signal and output current information of the constant current module, and sending a control signal to the constant current module according to the constant current control reference signal and the output current information, wherein the control signal is used for controlling the constant current module to output a constant current and outputting a voltage matched with the reference voltage information. But above-mentioned utility model patent does not solve the problem that how to eliminate the operating voltage of the double improvement circuit when the phenomenon of the impact that electric capacity appears in the twinkling of an eye when cold starting in current direct current high voltage power supply system to power, equipment caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims to how eliminate the phenomenon of the impact that electric capacity appears when cold starting impact current in the twinkling of an eye to power, equipment caused in current direct current high voltage power supply system, improve the operating voltage of circuit at double simultaneously.
The utility model discloses a solve above-mentioned technical problem through following technical scheme:
a high-voltage-sharing constant-current circuit comprises: the circuit comprises a microprocessor (s1), a first drive circuit (s2), a reference circuit (s3), an amplifying circuit (s4), a second drive circuit (s5), a sampling resistor R1, a first voltage division circuit, a second voltage division circuit, a power tube Q1 and a power tube Q2; the power tube Q1 is connected with the power tube Q2 in series, the sampling resistor R1 is connected between the power tube Q1 and the power tube Q2 in series, the drain electrode of the power tube Q1 is used as a high-voltage input end, and the source electrode of the power tube Q2 is used as a constant-current output end; the first voltage division circuit is respectively connected with the drain electrode of the power tube Q2, the source electrode of the power tube Q2 and the second driving circuit (s 5); the second voltage division circuit is respectively connected with the drain electrode of the power tube Q1, the source electrode of the power tube Q2 and the second driving circuit (s 5); the reference circuit (s3) is connected with the microprocessor (s1), and the amplifying circuit (s4) is connected in parallel with two ends of the sampling resistor R1; the first drive circuit (s2) is connected to the gates of the microprocessor (s1), the reference circuit (s3), the amplifier circuit (s4), and the power transistor Q1.
The utility model discloses be applied to among the high voltage direct current power supply system, adopt power tube Q1 and power tube Q2 series connection's structure, through the mode of constant current output, realize the slow play of the charging or capacitive load of electric capacity, eliminate the impulse current when starting, for present constant current circuit based on single power tube, the utility model discloses control two power tube Q1 and power tube Q2 simultaneous workings of establishing ties and in the constant current district, realize constant current output control, two power tube voltage-sharing control in the time of power tube Q1 and power tube Q2 constant current output, make the operating voltage of circuit reach the present twice of single power tube constant current circuit, the range of application is wider.
As a further improvement of the technical solution of the present invention, the first voltage dividing circuit includes a voltage dividing resistor R2 and a voltage dividing resistor R3, and the second voltage dividing circuit includes a voltage dividing resistor R4 and a voltage dividing resistor R5; after the voltage dividing resistor R2 is connected in series with the voltage dividing resistor R3, the non-series end of the voltage dividing resistor R2 is connected to the drain of the power tube Q2, and the non-series end of the voltage dividing resistor R3 is connected to the source of the power tube Q2; after the voltage dividing resistor R4 is connected in series with the voltage dividing resistor R5, the non-series end of the voltage dividing resistor R4 is connected to the drain of the power tube Q1, and the non-series end of the voltage dividing resistor R5 is connected to the source of the power tube Q2; the second driving circuit (s5) is connected to the common point of the voltage dividing resistor R2 and the voltage dividing resistor R3 in series, the common point of the voltage dividing resistor R4 and the voltage dividing resistor R5 in series, the gate of the power transistor Q2, and the microprocessor (s1), respectively.
As a further improvement of the technical solution of the present invention, the microprocessor (s1) controls the operation of the first driving circuit (s2), the reference circuit (s3) outputs the reference voltage Vref to the first driving circuit (s2), the first driving circuit (s2) outputs the driving voltage to make the power tube Q1 enter the conducting state, the output current is sequentially sampled by the sampling resistor R1 and amplified by the amplifying circuit (s4) to provide the negative feedback for the first driving circuit (s2), the negative feedback voltage is equal to the reference voltage Vref after the circuit is balanced, and the constant current output control is realized; the microprocessor (s1) controls the second driving circuit (s5) to work, the second driving circuit (s5) outputs driving voltage to enable the power tube Q2 to enter a conducting state, the voltage dividing circuit formed by the voltage dividing resistor R2 and the voltage dividing resistor R3 provides positive feedback for the second driving circuit (s5), the voltage dividing circuit formed by the voltage dividing resistor R4 and the voltage dividing resistor R5 provides negative feedback for the second driving circuit (s5), after the circuit works in balance, when the negative feedback voltage is equal to the positive feedback voltage, the drain-source voltage of the power tube Q1 is equal to the drain-source voltage of the power tube Q2, and voltage-sharing control of the two power tubes Q1 and Q2 is achieved.
As the further improvement of the technical proposal of the utility model, the power tube Q1 and the power tube Q2 are two after the circuit work is balancedThe condition of voltage sharing of the power tube is as follows: the voltage-dividing resistor R2-R5 satisfy
As a further improvement of the technical solution of the present invention, the first driving circuit (s2) comprises: a first driving unit (s21) and a first power supply unit (s 22); the first power supply unit (s22) is used for supplying power to the first drive unit (s 21); the first driving unit (s21) includes: the circuit comprises an operational amplifier N1A, a resistor R9, a resistor R11, a resistor R12, a resistor R14, a resistor R16, a capacitor C4 and a voltage stabilizing diode V1; the anode of the voltage stabilizing diode V1 is connected with the source of the power tube Q1, the cathode of the voltage stabilizing diode V1 is connected with the grid of the power tube Q1, the resistor R14 is connected with the two ends of the voltage stabilizing diode V1 in parallel, one end of the resistor R11 is connected with the grid of the power tube Q1, and the other end of the resistor R11 is connected with the output end of the operational amplifier N1A; after the resistor R16 is connected in series with the capacitor C4, the non-series end of the resistor R16 is connected to the inverting input end of the operational amplifier N1A, and the non-series end of the capacitor C4 is connected to the output end of the operational amplifier N1A; one end of the resistor R12 is connected to the inverting input terminal of the operational amplifier N1A, and the other end of the resistor R12 is connected to the amplifying circuit (s 4); one end of the resistor R9 is connected to the non-inverting input terminal of the operational amplifier N1A, and the other end of the resistor R9 is connected to the reference circuit (s 3); the power supply terminal of the operational amplifier N1A is connected to the first power supply unit (s 22).
As a further improvement of the present invention, the first power supply unit (s22) comprises: the circuit comprises an optical coupler E1, a triode Q3, a resistor R6, a resistor R7, a resistor R8, a capacitor C1 and a capacitor C2; the collector of the triode Q3 is connected with one end of a capacitor C1, the other end of the capacitor C1 is grounded, and the collector of the triode Q3 is connected with a +15V power supply; the emitter of the triode Q3 is connected with the power supply end of the operational amplifier N1A; after the resistor R7 is connected with the resistor R8 in series, the non-series end of the resistor R7 is connected with the collector of the triode Q3, the non-series end of the resistor R8 is connected with the base of the triode Q3, and the series common point of the resistor R7 and the resistor R8 is connected with the No. 4 pin of the optocoupler E1; one end of a capacitor C2 is connected to the base electrode of the triode Q3, the other end of the capacitor C2 is connected to the pin # 3 of the optocoupler E1, and the pin # 3 of the optocoupler E1 is grounded; one end of the resistor R6 is connected with a 1# pin of the optocoupler E1, and the other end of the resistor R6 is connected with a +5V power supply; and a 2# pin of the optical coupler E1 is connected with the microprocessor (s 1).
As a further improvement of the technical solution of the present invention, the amplifying circuit (s4) comprises: an operational amplifier N1B, a resistor R18, a resistor R20 and a resistor R21; one end of the resistor R18 is connected with the non-inverting input end of the operational amplifier N1B, and the other end of the resistor R18 is connected with the source electrode of the power tube Q1; one end of the resistor R21 is connected with the inverting input end of the operational amplifier N1B, and the other end of the resistor R21 is connected with the drain electrode of the power tube Q2; one end of the resistor R20 is connected to the inverting input terminal of the operational amplifier N1B, the other end of the resistor R20 is connected to the output terminal of the operational amplifier N1B, and the output terminal of the operational amplifier N1B is connected to the resistor R12 in the first driving unit (s 21).
As a further improvement of the technical solution of the present invention, the reference circuit (s3) comprises: the circuit comprises an optical coupler E2, an optical coupler E3, a resistor R10, a resistor R13, a resistor R15, a resistor R17, a resistor R19, a resistor R22 and a capacitor C3; after the resistor R10, the resistor R15, the resistor R19 and the resistor R22 are sequentially connected in series, the non-series end of the resistor R10 is connected with a +15V power supply, the series common point of the resistor R10 and the resistor R15 is connected to the No. 4 pin of the optocoupler E2, the series common point of the resistor R15 and the resistor R19 is simultaneously connected to the No. 3 pin of the optocoupler E2 and the No. 4 pin of the optocoupler E3, the series common point of the resistor R19 and the resistor R22 is connected to the No. 3 pin of the optocoupler E3, and the non-series end of the resistor R22 is grounded; one end of the resistor R13 is connected to the pin No. 1 of the optocoupler E2, the other end of the resistor R13 is connected with a +5V power supply, and the pin No. 2 of the optocoupler E2 is connected with the microprocessor (s 1); one end of the resistor R17 is connected to the pin No. 1 of the optocoupler E3, the other end of the resistor R17 is connected with a +5V power supply, and the pin No. 2 of the optocoupler E3 is connected with the microprocessor (s 1); one end of the capacitor C3 is grounded, the other end of the capacitor C3 is connected to the common point of the resistor R10 and the resistor R15 in series, and the common point of the resistor R10 and the resistor R15 in series is connected to the resistor R9 in the first driving unit (s 21).
As a further improvement of the technical solution of the present invention, the second driving circuit (s5) comprises: a second driving unit (s51) and a second power supply unit (s 52); the second power supply unit (s52) is used for supplying power to the second drive unit (s 51); the second driving unit (s51) includes: the circuit comprises an operational amplifier N2A, a resistor R26, a resistor R27, a resistor R28, a resistor R29, a resistor R30, a capacitor C7 and a voltage stabilizing diode V2; the anode of the voltage stabilizing diode V2 is connected with the source of the power tube Q2, the cathode of the voltage stabilizing diode V2 is connected with the grid of the power tube Q2, the resistor R29 is connected with the two ends of the voltage stabilizing diode V2 in parallel, one end of the resistor R27 is connected with the grid of the power tube Q2, and the other end of the resistor R27 is connected with the output end of the operational amplifier N2A; after the resistor R30 is connected in series with the capacitor C7, the non-series end of the resistor R30 is connected to the inverting input end of the operational amplifier N2A, and the non-series end of the capacitor C7 is connected to the output end of the operational amplifier N2A; one end of the resistor R28 is connected with the inverting input end of the operational amplifier N2A, and the other end of the resistor R28 is connected with the common point of the voltage dividing resistor R4 and the voltage dividing resistor R5 in series; one end of the resistor R26 is connected with the non-inverting input end of the operational amplifier N2A, and the other end of the resistor R26 is connected with the common point of the series connection of the voltage dividing resistor R2 and the voltage dividing resistor R3; the power supply terminal of the operational amplifier N2A is connected to the second power supply unit (s 52).
As a further improvement of the present invention, the second power supply unit (s52) comprises: the circuit comprises an optical coupler E4, a triode Q4, a resistor R23, a resistor R24, a resistor R25, a capacitor C5 and a capacitor C6; the collector of the triode Q4 is connected with one end of a capacitor C5, the other end of the capacitor C5 is grounded, and the collector of the triode Q4 is connected with a +15V power supply; the emitter of the triode Q4 is connected with the power supply end of the operational amplifier N2A; after the resistor R24 is connected with the resistor R25 in series, the non-series end of the resistor R24 is connected with the collector of the triode Q4, the non-series end of the resistor R25 is connected with the base of the triode Q4, and the series common point of the resistor R24 and the resistor R25 is connected with the No. 4 pin of the optocoupler E4; one end of a capacitor C6 is connected to the base electrode of the triode Q4, the other end of the capacitor C6 is connected to the pin # 3 of the optocoupler E4, and the pin # 3 of the optocoupler E4 is grounded; one end of the resistor R23 is connected with a 1# pin of the optocoupler E4, and the other end of the resistor R23 is connected with a +5V power supply; and a 2# pin of the optical coupler E4 is connected with the microprocessor (s 1).
As the technical scheme of the utility model further improve, power tube Q1 and power tube Q2 adopt high-pressure MOS pipe or high-pressure IGBT pipe.
The utility model has the advantages that:
(1) the utility model discloses be applied to among the high voltage direct current power supply system, adopt power tube Q1 and power tube Q2 series connection's structure, through the mode of constant current output, realize the slow play of the charging or capacitive load of electric capacity, eliminate the impulse current when starting, for present constant current circuit based on single power tube, the utility model discloses control two power tube Q1 and power tube Q2 simultaneous workings of establishing ties and in the constant current district, realize constant current output control, two power tube voltage-sharing control in the time of power tube Q1 and power tube Q2 constant current output, make the operating voltage of circuit reach the present twice of single power tube constant current circuit, the range of application is wider.
(2) The output current value can be adjusted by adjusting the value of the reference voltage Vref in the first drive circuit (s2), and the adjustment is convenient and sensitive.
Drawings
Fig. 1 is a block diagram of a high-voltage-sharing constant-current circuit according to an embodiment of the present invention;
fig. 2 is a first schematic diagram of a high-voltage-sharing constant-current circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a high-voltage-sharing constant-current circuit according to an embodiment of the present invention.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The technical solution of the present invention is further described below with reference to the drawings and specific embodiments of the specification:
example one
As shown in fig. 1, a high-voltage-sharing constant-current circuit includes: the circuit comprises a microprocessor (s1), a first driving circuit (s2), a reference circuit (s3), an amplifying circuit (s4), a second driving circuit (s5), a sampling resistor R1, a voltage division resistor R2, a voltage division resistor R3, a voltage division resistor R4, a voltage division resistor R5, a power tube Q1 and a power tube Q2.
The power tube Q1 and the power tube Q2 are connected in series, the power tube Q1 and the power tube Q2 adopt a high-voltage MOS tube or a high-voltage IGBT tube, and the high-voltage MOS tube is adopted in the embodiment; the sampling resistor R1 is connected in series between the power tube Q1 and the power tube Q2, the drain of the power tube Q1 is used as a high-voltage input end, and the source of the power tube Q2 is used as a constant-current output end. After the voltage dividing resistor R2 is connected in series with the voltage dividing resistor R3, the non-series end of the voltage dividing resistor R2 is connected to the drain of the power tube Q2, and the non-series end of the voltage dividing resistor R3 is connected to the source of the power tube Q2; after the voltage dividing resistor R4 is connected in series with the voltage dividing resistor R5, the non-series end of the voltage dividing resistor R4 is connected to the drain of the power tube Q1, and the non-series end of the voltage dividing resistor R5 is connected to the source of the power tube Q2. The reference circuit (s3) is connected to the microprocessor (s1) for providing a reference voltage Vref to the first drive circuit (s 2). The amplifying circuit (s4) is connected in parallel to two ends of the sampling resistor R1, and is used for amplifying the voltage sampled by the sampling resistor R1 and inputting the voltage to the first driving circuit (s2) to provide negative feedback. The first driving circuit (s2) is respectively connected with the gates of the microprocessor (s1), the reference circuit (s3), the amplifying circuit (s4) and the power tube Q1, and is used for providing the turn-on voltage of the power tube Q1. The second driving circuit (s5) is respectively connected with the common point of the voltage dividing resistor R2 and the voltage dividing resistor R3 in series, the common point of the voltage dividing resistor R4 and the voltage dividing resistor R5 in series, the grid of the power tube Q2 and the microprocessor (s1) and is used for providing the starting voltage of the power tube Q2.
Fig. 2 is a schematic diagram of a high-voltage-sharing constant-current circuit according to an embodiment of the present invention, wherein the first driving circuit (s2) includes: a first driving unit (s21) and a first power supply unit (s 22).
The first driving unit (s21) includes: the circuit comprises an operational amplifier N1A, a resistor R9, a resistor R11, a resistor R12, a resistor R14, a resistor R16, a capacitor C4 and a voltage stabilizing diode V1; the anode of the voltage stabilizing diode V1 is connected with the source of the power tube Q1, the cathode of the voltage stabilizing diode V1 is connected with the grid of the power tube Q1, the resistor R14 is connected with the two ends of the voltage stabilizing diode V1 in parallel, one end of the resistor R11 is connected with the grid of the power tube Q1, and the other end of the resistor R11 is connected with the output end of the operational amplifier N1A; after the resistor R16 is connected in series with the capacitor C4, the non-series end of the resistor R16 is connected to the inverting input end of the operational amplifier N1A, and the non-series end of the capacitor C4 is connected to the output end of the operational amplifier N1A; one end of the resistor R12 is connected to the inverting input terminal of the operational amplifier N1A, and the other end of the resistor R12 is connected to the amplifying circuit (s 4); one end of the resistor R9 is connected to the non-inverting input terminal of the operational amplifier N1A, and the other end of the resistor R9 is connected to the reference circuit (s 3); the power supply terminal of the operational amplifier N1A is connected to the first power supply unit (s 22).
The first power supply unit (s22) includes: the circuit comprises an optical coupler E1, a triode Q3, a resistor R6, a resistor R7, a resistor R8, a capacitor C1 and a capacitor C2; the collector of the triode Q3 is connected with one end of a capacitor C1, the other end of the capacitor C1 is grounded, and the collector of the triode Q3 is connected with a +15V power supply; the emitter of the triode Q3 is connected with the power supply end of the operational amplifier N1A; after the resistor R7 is connected with the resistor R8 in series, the non-series end of the resistor R7 is connected with the collector of the triode Q3, the non-series end of the resistor R8 is connected with the base of the triode Q3, and the series common point of the resistor R7 and the resistor R8 is connected with the No. 4 pin of the optocoupler E1; one end of a capacitor C2 is connected to the base electrode of the triode Q3, the other end of the capacitor C2 is connected to the pin # 3 of the optocoupler E1, and the pin # 3 of the optocoupler E1 is grounded; one end of the resistor R6 is connected with a 1# pin of the optocoupler E1, and the other end of the resistor R6 is connected with a +5V power supply; and a 2# pin of the optical coupler E1 is connected with the microprocessor (s 1).
The amplification circuit (s4) comprises: an operational amplifier N1B, a resistor R18, a resistor R20 and a resistor R21; one end of the resistor R18 is connected with the non-inverting input end of the operational amplifier N1B, and the other end of the resistor R18 is connected with the source electrode of the power tube Q1; one end of the resistor R21 is connected with the inverting input end of the operational amplifier N1B, and the other end of the resistor R21 is connected with the drain electrode of the power tube Q2; one end of the resistor R20 is connected to the inverting input terminal of the operational amplifier N1B, the other end of the resistor R20 is connected to the output terminal of the operational amplifier N1B, and the output terminal of the operational amplifier N1B is connected to the resistor R12 in the first driving unit (s 21).
The reference circuit (s3) comprises: the circuit comprises an optical coupler E2, an optical coupler E3, a resistor R10, a resistor R13, a resistor R15, a resistor R17, a resistor R19, a resistor R22 and a capacitor C3; after the resistor R10, the resistor R15, the resistor R19 and the resistor R22 are sequentially connected in series, the non-series end of the resistor R10 is connected with a +15V power supply, the series common point of the resistor R10 and the resistor R15 is connected to the No. 4 pin of the optocoupler E2, the series common point of the resistor R15 and the resistor R19 is simultaneously connected to the No. 3 pin of the optocoupler E2 and the No. 4 pin of the optocoupler E3, the series common point of the resistor R19 and the resistor R22 is connected to the No. 3 pin of the optocoupler E3, and the non-series end of the resistor R22 is grounded; one end of the resistor R13 is connected to the pin No. 1 of the optocoupler E2, the other end of the resistor R13 is connected with a +5V power supply, and the pin No. 2 of the optocoupler E2 is connected with the microprocessor (s 1); one end of the resistor R17 is connected to the pin No. 1 of the optocoupler E3, the other end of the resistor R17 is connected with a +5V power supply, and the pin No. 2 of the optocoupler E3 is connected with the microprocessor (s 1); one end of the capacitor C3 is grounded, the other end of the capacitor C3 is connected to the common point of the resistor R10 and the resistor R15 in series, and the common point of the resistor R10 and the resistor R15 in series is connected to the resistor R9 in the first driving unit (s 21).
Fig. 3 is a schematic diagram of a high voltage equalizing constant current circuit according to an embodiment of the present invention, wherein the second driving circuit (s5) includes: a second driving unit (s51) and a second power supply unit (s 52).
The second driving unit (s51) includes: the circuit comprises an operational amplifier N2A, a resistor R26, a resistor R27, a resistor R28, a resistor R29, a resistor R30, a capacitor C7 and a voltage stabilizing diode V2; the anode of the voltage stabilizing diode V2 is connected with the source of the power tube Q2, the cathode of the voltage stabilizing diode V2 is connected with the grid of the power tube Q2, the resistor R29 is connected with the two ends of the voltage stabilizing diode V2 in parallel, one end of the resistor R27 is connected with the grid of the power tube Q2, and the other end of the resistor R27 is connected with the output end of the operational amplifier N2A; after the resistor R30 is connected in series with the capacitor C7, the non-series end of the resistor R30 is connected to the inverting input end of the operational amplifier N2A, and the non-series end of the capacitor C7 is connected to the output end of the operational amplifier N2A; one end of the resistor R28 is connected with the inverting input end of the operational amplifier N2A, and the other end of the resistor R28 is connected with the common point of the voltage dividing resistor R4 and the voltage dividing resistor R5 in series; one end of the resistor R26 is connected with the non-inverting input end of the operational amplifier N2A, and the other end of the resistor R26 is connected with the common point of the series connection of the voltage dividing resistor R2 and the voltage dividing resistor R3; the power supply terminal of the operational amplifier N2A is connected to the second power supply unit (s 52).
The second power supply unit (s52) includes: the circuit comprises an optical coupler E4, a triode Q4, a resistor R23, a resistor R24, a resistor R25, a capacitor C5 and a capacitor C6; the collector of the triode Q4 is connected with one end of a capacitor C5, the other end of the capacitor C5 is grounded, and the collector of the triode Q4 is connected with a +15V power supply; the emitter of the triode Q4 is connected with the power supply end of the operational amplifier N2A; after the resistor R24 is connected with the resistor R25 in series, the non-series end of the resistor R24 is connected with the collector of the triode Q4, the non-series end of the resistor R25 is connected with the base of the triode Q4, and the series common point of the resistor R24 and the resistor R25 is connected with the No. 4 pin of the optocoupler E4; one end of a capacitor C6 is connected to the base electrode of the triode Q4, the other end of the capacitor C6 is connected to the pin # 3 of the optocoupler E4, and the pin # 3 of the optocoupler E4 is grounded; one end of the resistor R23 is connected with a 1# pin of the optocoupler E4, and the other end of the resistor R23 is connected with a +5V power supply; and a 2# pin of the optical coupler E4 is connected with the microprocessor (s 1).
As shown in fig. 2 and fig. 3, VIN is a high-voltage input terminal, VOUT is a constant-current output terminal, +5V is a control power supply, +15V1 is a power supply of the first driving circuit (s2), +15V2 is a power supply of the second driving circuit (s5), the sampling resistor R1 is a sampling resistor with a low resistance value, the voltage dividing resistors R2 to R5 are voltage dividing resistors with a high resistance value, the high-voltage input terminal is connected to the positive electrode of the high-voltage power supply, and the constant-current output terminal is connected to the electric equipment.
1. The working principle of constant current output is as follows:
+15V1 divides voltage through the return circuit that resistance R10, resistance R15, resistance R19 and resistance R22 constitute, provides reference voltage Vref for first drive circuit (s2), and microprocessor (s1) controls the break-make of opto-coupler E2, opto-coupler E3 through IO1 and IO2 interface, changes the value of reference voltage Vref. When the circuit is in operation, the microprocessor (s1) controls the CTR1 and CTR2 interface to be set high from low, so that the transistor Q3 and the transistor Q4 are conducted. +15V1 supplies power to the operational amplifier N1A through the triode Q3, because the non-inverting input terminal (pin # 3) of the operational amplifier N1A has the reference voltage Vref, the voltage at the output terminal (pin # 1) of the operational amplifier N1A starts to rise, this voltage provides the driving voltage for the power tube Q1, when the driving voltage rises to exceed the power tube on-voltage, the power tube Q1 enters the conducting state and the output current increases gradually, the output current passes through the sampling resistor R1, a sampling voltage is formed at both ends of the sampling resistor R1, the sampling voltage is amplified by the amplifying circuit (composed of the resistor R18, the resistor R20, the resistor R21 and the operational amplifier N1B) and then is inputted to the inverting input terminal (pin # 2) of the operational amplifier N1A, which plays a role of suppressing the rise of the output voltage of the operational amplifier N1A, under the action of the PI adjusting circuit composed of the operational amplifier N1A, the resistor R16, the capacitor C4, etc., when the voltage at the inverting input terminal of the operational amplifier N1A approaches the non-inverting input terminal, the operational amplifier N1A enters a balance state, the power tube Q1 outputs constant current, and the constant current value and the reference voltage Vref are in a linear relation, so the constant current value can be adjusted by adjusting the reference voltage value.
2. The working principle of pressure equalizing control is as follows:
+15V2 supplies power to the operational amplifier N2A through the triode Q4, the drain-source voltage of the power tube Q2 is divided by the voltage dividing resistor R2 and the voltage dividing resistor R3 and then is input to the non-inverting input end of the operational amplifier N2A to play a role in promoting the rise of the output voltage of the operational amplifier N2A, the total voltage between VIN and VOUT is divided by the voltage dividing resistor R4 and the voltage dividing resistor R5 and then is input to the inverting input end of the operational amplifier N2A to play a role in restraining the rise of the output voltage of the operational amplifier N2A, then under the action of a PI adjusting circuit formed by the operational amplifier N2A, the resistor R30 and the capacitor C7, when the voltage of the inverting input end of the operational amplifier N2A is infinitely close to the voltage of the non-inverting input end, the operational amplifier N2A enters a balanced state, and when the voltage dividing resistors R2-R5 meet the requirement
In the process, the drain-source voltage of the power tube Q2 is about half of the total voltage between VIN and VOUT, and the voltages at the two ends of the sampling resistor R1 are ignored, so that the drain-source voltage of the power tube Q1 is equal to the drain-source voltage of the power tube Q2, and therefore voltage-sharing control of the two power tubes is achieved.
In summary, when the circuit is in a balanced state, a constant current output with controllable current can be realized, and the two power tubes Q1 and Q2 connected in series bear half of the operating voltage respectively.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (9)
1. A high-voltage-sharing constant-current circuit is characterized by comprising: the circuit comprises a microprocessor (s1), a first drive circuit (s2), a reference circuit (s3), an amplifying circuit (s4), a second drive circuit (s5), a sampling resistor R1, a first voltage division circuit, a second voltage division circuit, a power tube Q1 and a power tube Q2; the power tube Q1 is connected with the power tube Q2 in series, the sampling resistor R1 is connected between the power tube Q1 and the power tube Q2 in series, the drain electrode of the power tube Q1 is used as a high-voltage input end, and the source electrode of the power tube Q2 is used as a constant-current output end; the first voltage division circuit is respectively connected with the drain electrode of the power tube Q2, the source electrode of the power tube Q2 and the second driving circuit (s 5); the second voltage division circuit is respectively connected with the drain electrode of the power tube Q1, the source electrode of the power tube Q2 and the second driving circuit (s 5); the reference circuit (s3) is connected with the microprocessor (s1), and the amplifying circuit (s4) is connected in parallel with two ends of the sampling resistor R1; the first drive circuit (s2) is connected to the gates of the microprocessor (s1), the reference circuit (s3), the amplifier circuit (s4), and the power transistor Q1.
2. The high-voltage-sharing constant-current circuit according to claim 1, wherein the first voltage-sharing circuit comprises a voltage-sharing resistor R2 and a voltage-sharing resistor R3, and the second voltage-sharing circuit comprises a voltage-sharing resistor R4 and a voltage-sharing resistor R5; after the voltage dividing resistor R2 is connected in series with the voltage dividing resistor R3, the non-series end of the voltage dividing resistor R2 is connected to the drain of the power tube Q2, and the non-series end of the voltage dividing resistor R3 is connected to the source of the power tube Q2; after the voltage dividing resistor R4 is connected in series with the voltage dividing resistor R5, the non-series end of the voltage dividing resistor R4 is connected to the drain of the power tube Q1, and the non-series end of the voltage dividing resistor R5 is connected to the source of the power tube Q2; the second driving circuit (s5) is connected to the common point of the voltage dividing resistor R2 and the voltage dividing resistor R3 in series, the common point of the voltage dividing resistor R4 and the voltage dividing resistor R5 in series, the gate of the power transistor Q2, and the microprocessor (s1), respectively.
3. A high voltage equalizing constant current circuit according to claim 1, wherein said first driving circuit (s2) comprises: a first driving unit (s21) and a first power supply unit (s 22); the first power supply unit (s22) is used for supplying power to the first drive unit (s 21); the first driving unit (s21) includes: the circuit comprises an operational amplifier N1A, a resistor R9, a resistor R11, a resistor R12, a resistor R14, a resistor R16, a capacitor C4 and a voltage stabilizing diode V1; the anode of the voltage stabilizing diode V1 is connected with the source of the power tube Q1, the cathode of the voltage stabilizing diode V1 is connected with the grid of the power tube Q1, the resistor R14 is connected with the two ends of the voltage stabilizing diode V1 in parallel, one end of the resistor R11 is connected with the grid of the power tube Q1, and the other end of the resistor R11 is connected with the output end of the operational amplifier N1A; after the resistor R16 is connected in series with the capacitor C4, the non-series end of the resistor R16 is connected to the inverting input end of the operational amplifier N1A, and the non-series end of the capacitor C4 is connected to the output end of the operational amplifier N1A; one end of the resistor R12 is connected to the inverting input terminal of the operational amplifier N1A, and the other end of the resistor R12 is connected to the amplifying circuit (s 4); one end of the resistor R9 is connected to the non-inverting input terminal of the operational amplifier N1A, and the other end of the resistor R9 is connected to the reference circuit (s 3); the power supply terminal of the operational amplifier N1A is connected to the first power supply unit (s 22).
4. A high voltage equalizing constant current circuit according to claim 3, wherein said first power supply unit (s22) comprises: the circuit comprises an optical coupler E1, a triode Q3, a resistor R6, a resistor R7, a resistor R8, a capacitor C1 and a capacitor C2; the collector of the triode Q3 is connected with one end of a capacitor C1, the other end of the capacitor C1 is grounded, and the collector of the triode Q3 is connected with a +15V power supply; the emitter of the triode Q3 is connected with the power supply end of the operational amplifier N1A; after the resistor R7 is connected with the resistor R8 in series, the non-series end of the resistor R7 is connected with the collector of the triode Q3, the non-series end of the resistor R8 is connected with the base of the triode Q3, and the series common point of the resistor R7 and the resistor R8 is connected with the No. 4 pin of the optocoupler E1; one end of a capacitor C2 is connected to the base electrode of the triode Q3, the other end of the capacitor C2 is connected to the pin # 3 of the optocoupler E1, and the pin # 3 of the optocoupler E1 is grounded; one end of the resistor R6 is connected with a 1# pin of the optocoupler E1, and the other end of the resistor R6 is connected with a +5V power supply; and a 2# pin of the optical coupler E1 is connected with the microprocessor (s 1).
5. A high voltage equalizing constant current circuit according to claim 3, wherein said amplifying circuit (s4) comprises: an operational amplifier N1B, a resistor R18, a resistor R20 and a resistor R21; one end of the resistor R18 is connected with the non-inverting input end of the operational amplifier N1B, and the other end of the resistor R18 is connected with the source electrode of the power tube Q1; one end of the resistor R21 is connected with the inverting input end of the operational amplifier N1B, and the other end of the resistor R21 is connected with the drain electrode of the power tube Q2; one end of the resistor R20 is connected to the inverting input terminal of the operational amplifier N1B, the other end of the resistor R20 is connected to the output terminal of the operational amplifier N1B, and the output terminal of the operational amplifier N1B is connected to the resistor R12 in the first driving unit (s 21).
6. A high voltage equalizing constant current circuit according to claim 3, wherein said reference circuit (s3) comprises: the circuit comprises an optical coupler E2, an optical coupler E3, a resistor R10, a resistor R13, a resistor R15, a resistor R17, a resistor R19, a resistor R22 and a capacitor C3; after the resistor R10, the resistor R15, the resistor R19 and the resistor R22 are sequentially connected in series, the non-series end of the resistor R10 is connected with a +15V power supply, the series common point of the resistor R10 and the resistor R15 is connected to the No. 4 pin of the optocoupler E2, the series common point of the resistor R15 and the resistor R19 is simultaneously connected to the No. 3 pin of the optocoupler E2 and the No. 4 pin of the optocoupler E3, the series common point of the resistor R19 and the resistor R22 is connected to the No. 3 pin of the optocoupler E3, and the non-series end of the resistor R22 is grounded; one end of the resistor R13 is connected to the pin No. 1 of the optocoupler E2, the other end of the resistor R13 is connected with a +5V power supply, and the pin No. 2 of the optocoupler E2 is connected with the microprocessor (s 1); one end of the resistor R17 is connected to the pin No. 1 of the optocoupler E3, the other end of the resistor R17 is connected with a +5V power supply, and the pin No. 2 of the optocoupler E3 is connected with the microprocessor (s 1); one end of the capacitor C3 is grounded, the other end of the capacitor C3 is connected to the common point of the resistor R10 and the resistor R15 in series, and the common point of the resistor R10 and the resistor R15 in series is connected to the resistor R9 in the first driving unit (s 21).
7. A high voltage equalizing constant current circuit according to claim 1, wherein said second driving circuit (s5) comprises: a second driving unit (s51) and a second power supply unit (s 52); the second power supply unit (s52) is used for supplying power to the second drive unit (s 51); the second driving unit (s51) includes: the circuit comprises an operational amplifier N2A, a resistor R26, a resistor R27, a resistor R28, a resistor R29, a resistor R30, a capacitor C7 and a voltage stabilizing diode V2; the anode of the voltage stabilizing diode V2 is connected with the source of the power tube Q2, the cathode of the voltage stabilizing diode V2 is connected with the grid of the power tube Q2, the resistor R29 is connected with the two ends of the voltage stabilizing diode V2 in parallel, one end of the resistor R27 is connected with the grid of the power tube Q2, and the other end of the resistor R27 is connected with the output end of the operational amplifier N2A; after the resistor R30 is connected in series with the capacitor C7, the non-series end of the resistor R30 is connected to the inverting input end of the operational amplifier N2A, and the non-series end of the capacitor C7 is connected to the output end of the operational amplifier N2A; one end of the resistor R28 is connected with the inverting input end of the operational amplifier N2A, and the other end of the resistor R28 is connected with the common point of the voltage dividing resistor R4 and the voltage dividing resistor R5 in series; one end of the resistor R26 is connected with the non-inverting input end of the operational amplifier N2A, and the other end of the resistor R26 is connected with the common point of the series connection of the voltage dividing resistor R2 and the voltage dividing resistor R3; the power supply terminal of the operational amplifier N2A is connected to the second power supply unit (s 52).
8. The high voltage equalizing constant current circuit according to claim 7, wherein the second power supply unit (s52) comprises: the circuit comprises an optical coupler E4, a triode Q4, a resistor R23, a resistor R24, a resistor R25, a capacitor C5 and a capacitor C6; the collector of the triode Q4 is connected with one end of a capacitor C5, the other end of the capacitor C5 is grounded, and the collector of the triode Q4 is connected with a +15V power supply; the emitter of the triode Q4 is connected with the power supply end of the operational amplifier N2A; after the resistor R24 is connected with the resistor R25 in series, the non-series end of the resistor R24 is connected with the collector of the triode Q4, the non-series end of the resistor R25 is connected with the base of the triode Q4, and the series common point of the resistor R24 and the resistor R25 is connected with the No. 4 pin of the optocoupler E4; one end of a capacitor C6 is connected to the base electrode of the triode Q4, the other end of the capacitor C6 is connected to the pin # 3 of the optocoupler E4, and the pin # 3 of the optocoupler E4 is grounded; one end of the resistor R23 is connected with a 1# pin of the optocoupler E4, and the other end of the resistor R23 is connected with a +5V power supply; and a 2# pin of the optical coupler E4 is connected with the microprocessor (s 1).
9. The high-voltage-sharing constant-current circuit according to claim 1, wherein the power transistor Q1 and the power transistor Q2 are high-voltage MOS transistors or high-voltage IGBT transistors.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114844347A (en) * | 2022-06-30 | 2022-08-02 | 南京宏泰半导体科技有限公司 | Circuit and method for reducing power consumption of high-voltage tester power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114844347A (en) * | 2022-06-30 | 2022-08-02 | 南京宏泰半导体科技有限公司 | Circuit and method for reducing power consumption of high-voltage tester power supply |
| CN114844347B (en) * | 2022-06-30 | 2022-09-30 | 南京宏泰半导体科技有限公司 | Circuit and method for reducing power consumption of high-voltage tester power supply |
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