Self-adaptive current sharing circuit based on modularization

Abstract

The utility model relates to the technical field of circuits, and discloses a self-adaptive current sharing circuit based on modularization, which is characterized by comprising a current detection amplification circuit, a current sharing bus module, a differential amplification circuit, a control circuit and a voltage given regulation circuit, the current detection amplification circuit is connected with the current-sharing bus module through an isolation resistor R14, the current detection amplification circuit is connected with the differential amplification circuit through a first filter circuit, and the current-sharing bus module is connected with the plurality of charging modules. The current sharing bus module is connected with the differential amplification circuit through the second filter circuit, and the differential amplification circuit is connected with the voltage given adjusting circuit through the control circuit. According to the utility model, current output of each charging module can be automatically adjusted, and balanced distribution of current is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, and in particular to a modular-based adaptive current-sharing circuit. Background Art

[0002] With the continuous development of the power supply industry, switching power supplies are gradually moving towards integration and modularization. In order to shorten the R&D cycle, high-power charging equipment is generally composed of multiple charging modules in series and parallel. This can not only effectively reduce the company's R&D cycle and cost, but also facilitate customization. Among them, when the charging equipment needs to output a large current, a single charging module cannot meet the output requirements, so multiple internal charging modules are required to be connected in parallel for current sharing output. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies of the above prior art and provide a modularized adaptive current sharing circuit.

[0004] The purpose of the utility model is achieved through the following technical solutions: a modular adaptive current sharing circuit includes a current detection amplifier circuit, a current sharing bus module, a differential amplifier circuit, a control circuit and a voltage setting adjustment circuit, wherein the current detection amplifier circuit is connected to the charging module, the current detection amplifier circuit is connected to the current sharing bus module through an isolation resistor R14, the current detection amplifier circuit is connected to the differential amplifier circuit through a first filter circuit, the current sharing bus module is connected to the differential amplifier circuit through a second filter circuit, and the differential amplifier circuit is connected to the voltage setting adjustment circuit through the control circuit;

[0005] The current detection amplifier circuit is used to sample and amplify the output current signal of the charging module to obtain an amplified current sampling signal;

[0006] The current sharing bus module is used to connect other charging modules;

[0007] The differential amplifier circuit is used to compare and amplify the current sampling signal of the current detection amplifier circuit with the current sharing bus signal of the current sharing bus module, and generate the amplified difference signal;

[0008] The control circuit is used to control whether the adaptive current sharing circuit works;

[0009] The voltage setting adjustment circuit is used to superimpose the amplified difference signal on the output voltage setting signal, thereby adjusting the output voltage and the output current.

[0010] A better choice, the current detection amplifier circuit includes capacitor C4, capacitor C5, capacitor C6, resistor R6, resistor R7, resistor R8, resistor R12 and operational amplifier U2-C, the positive electrode of the charging module, one end of the resistor R6 and one end of the capacitor C4 are all connected to one end of the resistor R7, the negative electrode of the charging module, the other end of the resistor R6 and the other end of the capacitor C4 are all connected to one end of the resistor R12, the 10 end of the operational amplifier U2-C is respectively connected to one end of the capacitor C5 and the other end of the resistor R12, the 9 end of the operational amplifier U2-C is respectively connected to the other end of the resistor R7, the other end of the capacitor C5, one end of the resistor R8 and one end of the capacitor C6, and the 8 end of the operational amplifier U2-C is respectively connected to the other end of the capacitor C6, the other end of the resistor, the first filter circuit and the isolation resistor R14.

[0011] More preferably, the amplification ratio of the current detection amplifier circuit is 1+resistance value of resistor R8 / resistance value of resistor R7.

[0012] A better choice, the differential amplifier circuit includes an operational amplifier U2-A, an operational amplifier U2-B, an operational amplifier U2-D, a capacitor C8, a capacitor C9, a capacitor C10, a resistor R10, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20 and a resistor R21, one end of the operational amplifier U2-A is respectively connected to one end of the resistor R18 and one end of the resistor R19, two ends of the operational amplifier U2-A are respectively connected to one end of the resistor R16 and the other end of the resistor R18, three ends of the operational amplifier U2-A are connected to the first filter circuit, four ends of the operational amplifier U2-A are respectively connected to the positive terminal of the 12V voltage and one end of the capacitor C8, the other end of the capacitor C8 and the 11th end of the operational amplifier U2-A are both grounded, and the operational amplifier Terminal 5 of U2-B is connected to the second filtering circuit, terminal 6 of the operational amplifier U2-B is respectively connected to the other end of the resistor R16 and one end of the resistor R17, terminal 7 of the operational amplifier U2-B is respectively connected to the other end of the resistor R17 and one end of the R20, terminal 12 of the operational amplifier U2-D is respectively connected to the other end of the resistor R20, one end of the resistor R21 and the control circuit, the other end of the resistor R21 is grounded, terminal 13 of the operational amplifier U2-D is respectively connected to the other end of R19, one end of the resistor R10 and the other end of the capacitor C9, terminal 14 of the operational amplifier U2-D is respectively connected to the other end of the capacitor C9, one end of the capacitor C10 and the control circuit, and the other end of the resistor R10 is connected to the other end of the capacitor C10.

[0013] A better choice is that the control circuit includes a resistor R22, a resistor R23, a resistor R24, a resistor R25, an N-MOSFETU3, a P-MOSFET U5 and a transistor Q1, one end of the N-MOSFET U3 is respectively connected to one end of the P-MOSFET U5, one end of the resistor R23 and three ends of the transistor Q1, the other end of the resistor R23 is connected to the positive terminal of the 12V voltage, two ends of the N-MOSFET U3 are connected to the voltage setting adjustment circuit, three ends of the N-MOSFET U3 are connected to the differential amplifier circuit, two ends of the P-MOSFET U5 are connected to the positive terminal of the 12V voltage, three ends of the P-MOSFET U5 are connected to the differential amplifier circuit through the resistor R22, two ends of the transistor Q1 and one end of the resistor R24 ​​are grounded, the other end of the resistor R24 ​​and one end of the transistor Q1 are connected to one end of the resistor R25, and the R25 is connected to the CS-CTR signal terminal.

[0014] A better choice is that the voltage setting adjustment circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R11, a capacitor C1, a capacitor C2, a capacitor C3 and a voltage follower U1-A, one end of the resistor R2 is respectively connected to the PWMV signal end and one end of the resistor R1, the other end of the resistor R2 is respectively connected to one end of the capacitor C1 and one end of the resistor R3, the other end of the resistor R3 is respectively connected to one end of the capacitor C2 and one end of the resistor R4, and the other end of the resistor R4 is connected to the 3 ends of the voltage follower U1-A. The first end of the voltage follower U1-A is connected to the positive terminal of the 12V voltage, the second end of the voltage follower U1-A is connected to the positive terminal of the 12V voltage, the second end of the resistor R5 is connected to the V_SET and the first end of the resistor R11, and the second end of the resistor R11 is connected to the control circuit.

[0015] A better choice is that the current sharing bus module includes a current sharing bus interface J1, an ESD electrostatic protection device U4, a capacitor C11, a capacitor C12, a resistor R13 and a common-mode filter inductor L1. One end of the current sharing bus interface J1 is respectively connected to two ends of the ESD electrostatic protection device U4, one end of the capacitor C11 and three ends of the common-mode filter inductor L1, two ends of the current sharing bus interface J1 are respectively connected to one end of the ESD electrostatic protection device U4, the other end of the capacitor C11 and two ends of the common-mode filter inductor L1, three ends of the ESD electrostatic protection device U4 are grounded, one end of the common-mode filter inductor L1 is respectively connected to one end of the resistor R13 and one end of the capacitor C12, the other end of the resistor C13 and the other end of the capacitor C12 are both grounded, and four ends of the common-mode filter inductor L1 are respectively connected to the isolation resistor R14 and the second filter circuit.

[0016] A better choice is that the first filtering circuit includes a resistor R9 and a capacitor C7, one end of the resistor R9 is connected to the current detection amplifier circuit, the other end of the resistor R9 is respectively connected to one end of the capacitor C7 and the differential amplifier circuit, and the other end of the capacitor C7 is grounded.

[0017] A better choice is that the second filtering circuit includes a resistor R15 and a capacitor C13, one end of the resistor R15 is connected to the current detection amplifier circuit, the other end of the resistor R15 is respectively connected to one end of the capacitor C13 and the differential amplifier circuit, and the other end of the capacitor C13 is grounded.

[0018] The utility model has the following advantages and beneficial effects compared with the prior art:

[0019] The utility model can automatically adjust the current output of each charging module and realize balanced current distribution through a current detection amplifier circuit, a current sharing bus module, a differential amplifier circuit, a control circuit and a voltage setting adjustment circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a modularized adaptive current sharing circuit of the utility model;

[0021] The markings of the components in the attached drawings are as follows: 1-current detection amplifier circuit; 2-current sharing bus module; 3-differential amplifier circuit; 4-control circuit; 5-voltage setting adjustment circuit. DETAILED DESCRIPTION

[0022] The utility model object of the utility model is further described in detail below in conjunction with the drawings and specific embodiments. The embodiments cannot be described one by one here, but the implementation method of the utility model is not limited to the following embodiments.

[0023] like Figure 1 As shown, a modular adaptive current sharing circuit includes a current detection amplifier circuit 1, a current sharing bus module 2, a differential amplifier circuit 3, a control circuit 4 and a voltage setting adjustment circuit 5, the current detection amplifier circuit 1 is connected to a single charging module, the current detection amplifier circuit 1 is connected to the current sharing bus module 2 through an isolation resistor R14, the current detection amplifier circuit 1 is connected to the differential amplifier circuit 3 through a first filter circuit, the current sharing bus module 2 is connected to multiple charging modules, the multiple charging modules are connected in parallel, the current sharing bus module 2 is connected to the differential amplifier circuit 3 through a second filter circuit, and the differential amplifier circuit 3 is connected to the voltage setting adjustment circuit 5 through a control circuit 4.

[0024] The current detection amplifier circuit 1 is mainly used to sample and amplify the output current signal of the charging module. It amplifies the weak current sampling signal through the in-phase proportional amplifier circuit. The current sampling signal amplification ratio is: 1+resistance value of resistor R8 / resistance value of resistor R7; the differential amplifier circuit 3 is used to compare and amplify the amplified current sampling signal with the current sampling amplified signal of the current sharing bus module 2 to obtain a current sharing adjustment signal. The control circuit 4 is used to control the working state of the modular adaptive current sharing circuit, that is, whether it is working or not working. The voltage setting adjustment circuit 5 is used to superimpose the current sharing adjustment signal on the output voltage setting signal, thereby adjusting the output voltage and output current. The current sharing bus module 2 is essentially a common connection line of multiple current sharing bus interfaces J1, which is used to connect multiple charging modules, and multiple charging modules are connected in parallel. The isolation resistor R14 is used to isolate the voltage of the current sharing bus module 2 from the amplified voltage of the output current of the charging module through the current detection amplifier circuit 1. The charging module can be purchased in the existing market and used to provide power to the device.

[0025] The first filtering circuit includes a resistor R9 and a capacitor C7, one end of the resistor R9 is connected to the 8-terminal of the operational amplifier U2-C of the current detection amplifier circuit 1, the resistor R8, and the capacitor C6, and one end of the resistor R9 is connected to the isolation resistor R14. The other end of the resistor R9 is respectively connected to one end of the capacitor C7 and the 3-terminal of the operational amplifier U2-A of the differential amplifier circuit 3, and the other end of the capacitor C7 is grounded. The resistor R9 and the capacitor C7 form a first-order RC filtering circuit for filtering out the input signal noise of the differential amplifier circuit 3.

[0026] The second filtering circuit includes a resistor R15 and a capacitor C13, one end of the resistor R15 is respectively connected to the 4th terminal of the common mode filtering inductor L1 of the current detection amplifier circuit 1 and the isolation resistor R14. The other end of the resistor R15 is respectively connected to one end of the capacitor C13 and the 5th terminal of the operational amplifier U2-B of the differential amplifier circuit 3, and the other end of the capacitor C13 is grounded. The resistor R15 and the capacitor C13 form a first-order RC filtering circuit for filtering the other input signal noise of the differential amplifier circuit 3.

[0027] The working principle is: the output current of a single charging module is sampled and amplified by the current detection amplifier circuit 1, and then compared with the current sampling and amplification signal of the current sharing bus module 2 to obtain the difference, and the difference is amplified by the differential amplifier circuit 3 to obtain the current sharing adjustment signal. The current sharing adjustment signal is adjusted by the PI regulator (linear regulator, P represents the proportional control term, I represents the integral control term) of the voltage setting adjustment circuit 5 and then superimposed on the output voltage setting signal, thereby changing the output voltage setting signal of the single-chip microcomputer, adjusting the output voltage of the charging module, and indirectly adjusting the output current of the charging module.

[0028] The current detection amplifier circuit 1 includes capacitor C4, capacitor C5, capacitor C6, resistor R6, resistor R7, resistor R8, resistor R12 and operational amplifier U2-C. The positive terminal of a single charging module, one end of resistor R6 and one end of capacitor C4 are all connected to one end of resistor R7, the negative terminal of a single charging module, the other end of resistor R6 and the other end of capacitor C4 are all connected to one end of resistor R12, the 10 end of the operational amplifier U2-C is respectively connected to one end of capacitor C5 and the other end of resistor R12, the 9 end of the operational amplifier U2-C is respectively connected to the other end of resistor R7, the other end of capacitor C5, one end of resistor R8 and one end of capacitor C6, and the 8 end of the operational amplifier U2-C is respectively connected to the other end of capacitor C6, the other end of the resistor, resistor R9 of the first filter circuit and isolation resistor R14.

[0029] The differential amplifier circuit 3 includes an operational amplifier U2-A, an operational amplifier U2-B, an operational amplifier U2-D, a capacitor C8, a capacitor C9, a capacitor C10, a resistor R10, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20 and a resistor R21. Terminal 1 of the operational amplifier U2-A is respectively connected to one end of the resistor R18 and one end of the resistor R19, terminals 2 of the operational amplifier U2-A are respectively connected to one end of the resistor R16 and the other end of the resistor R18, terminals 3 of the operational amplifier U2-A are connected to the resistor R9 and the capacitor C7 of the first filter circuit, terminals 4 of the operational amplifier U2-A are respectively connected to the positive terminal of the 12V voltage and one end of the capacitor C8, and the other end of the capacitor C8 and terminals 11 of the operational amplifier U2-A are both connected. The 5th terminal of the operational amplifier U2-B is connected to the resistor R15 and the capacitor C13 of the second filtering circuit, the 6th terminal of the operational amplifier U2-B is respectively connected to the other end of the resistor R16 and one end of the resistor R17, the 7th terminal of the operational amplifier U2-B is respectively connected to the other end of the resistor R17 and one end of R20, the 12th terminal of the operational amplifier U2-D is respectively connected to the other end of the resistor R20, one end of the resistor R21 and the resistor R22 of the control circuit 4, the other end of the resistor R21 is grounded, the 13th terminal of the operational amplifier U2-D is respectively connected to the other end of R19, one end of the resistor R10 and the other end of the capacitor C9, the 14th terminal of the operational amplifier U2-D is respectively connected to the other end of the capacitor C9, one end of the capacitor C10 and the N-MOSFET U3 of the control circuit 4, and the other end of the resistor R10 is connected to the other end of the capacitor C10.

[0030] The current-sharing bus module 2 includes a current-sharing bus interface J1, an ESD electrostatic protection device U4, a capacitor C11, a capacitor C12, a resistor R13 and a common-mode filter inductor L1. One end of the current-sharing bus interface J1 is respectively connected to two ends of the ESD electrostatic protection device U4, one end of the capacitor C11 and three ends of the common-mode filter inductor L1. Two ends of the current-sharing bus interface J1 are respectively connected to one end of the ESD electrostatic protection device U4, the other end of the capacitor C11 and two ends of the common-mode filter inductor L1. Three ends of the ESD electrostatic protection device U4 are grounded. One end of the common-mode filter inductor L1 is respectively connected to one end of the resistor R13 and one end of the capacitor C12. The other end of the resistor C13 and the other end of the capacitor C12 are both grounded. Four ends of the common-mode filter inductor L1 are connected to the isolation resistor R14 and the resistor R15 of the second filter circuit.

[0031] The model of the ESD electrostatic protection device U4 is: PSM712, which is used to protect sensitive circuits in electronic equipment from the influence of ESD (electrostatic discharge). The common mode filter inductor L1 is used to filter out the common mode noise of the output signal. The current sharing bus interface J1 is used to connect multiple charging modules.

[0032] The regulation process of a modular adaptive current-sharing circuit is as follows: when the output current of the charging module is the highest, after sampling and amplification by the current detection amplifier circuit 1, the output voltage of the 8th pin of the operational amplifier U2-C is higher than the output voltage of the current-sharing bus module 2, and the difference is obtained by comparison. After the difference is differentially amplified by the differential amplifier circuit 3, the operational amplifier U2-D outputs a low level, pulls down the output voltage given signal, and causes the output voltage of the charging module to drop, thereby reducing the output current of the charging module. Conversely, when the output current of the charging module is low, after sampling and amplification by the current detection amplifier circuit 1, the output voltage of the 8th pin of the operational amplifier U2-C is lower than the output voltage of the current-sharing bus module 2, and after the difference is differentially amplified by the differential amplifier circuit 3, the operational amplifier U2-D outputs a high level, pulls up the output voltage given signal, causes the output voltage of the charging module to rise, thereby increasing the output current of the charging module.

[0033] The control circuit 4 includes a resistor R22, a resistor R23, a resistor R24, a resistor R25, an N-MOSFET (N-Metal-Oxide-Semiconductor Field-Effect Transistor, N-channel type - metal-oxide semiconductor field effect transistor) U3, a P-MOSFET (P-Metal-Oxide-Semiconductor Field-Effect Transistor, P-channel type - metal-oxide semiconductor field effect transistor) U5 and a transistor Q1, one end of the N-MOSFET U3 is respectively connected to one end of the P-MOSFET U5, one end of the resistor R23 and the three ends of the transistor Q1, the other end of the resistor R23 is connected to the positive terminal of the 12V voltage, the two ends of the N-MOSFET U3 are connected to the resistor R11 of the voltage setting adjustment circuit 5, the three ends of the N-MOSFET U3 are connected to the resistor C10 of the differential amplifier circuit 3, the capacitor C9 and the 14 ends of the operational amplifier U2-D, and the P-MOSFET Terminal 3 of U5 is connected to resistor R20, resistor R21 and terminal 12 of operational amplifier U2-D of differential amplifier circuit 3 through resistor R22, terminals 2 of transistor Q1 and one end of resistor R24 ​​are grounded, the other end of resistor R24 ​​and terminal 1 of transistor Q1 are connected to one end of resistor R25, and R25 is connected to the CS-CTR signal terminal.

[0034] The working principle of the control circuit 4 is as follows: when the CS-CTR signal terminal is at a high level, the transistor Q1 is turned on, the C terminal (i.e., terminal 3) of the transistor Q1 is pulled down to the ground, the N-MOSFET U3 is cut off, the differential amplifier circuit 3 is disconnected from the voltage setting adjustment circuit 5, the entire adaptive current balancing circuit does not work, the P-MOSFET U5 is turned on, the in-phase input terminal of the operational amplifier U2-D is at a high level, and the operational amplifier U2-D outputs a high level, which can effectively prevent the influence of the body diode of the N-MOSFET U3 on the output voltage setting signal; similarly, when the CS-CTR signal terminal is at a low level, the adaptive current balancing circuit works normally.

[0035] The voltage setting adjustment circuit 5 includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R11, a capacitor C1, a capacitor C2, a capacitor C3 and a voltage follower U1-A, one end of the resistor R2 is respectively connected to the PWMV signal end and one end of the resistor R1, the other end of the resistor R2 is respectively connected to one end of the capacitor C1 and one end of the resistor R3, the other end of the resistor R3 is respectively connected to one end of the capacitor C2 and one end of the resistor R4, and the other end of the resistor R4 is connected to three ends of the voltage follower U1-A. The two ends of the voltage follower U1-A are respectively connected to the one end of the voltage follower U1-A and one end of the resistor R5, the other end of the resistor R1, the other end of the capacitor C1, the other end of the capacitor C2, the other end of the capacitor C3 and the four ends of the voltage follower U1-A are all grounded, the eight ends of the voltage follower U1-A and one end of the capacitor C3 are both connected to the positive terminal of the 12V voltage, the other end of the resistor R5 is respectively connected to the V_SET end and one end of the resistor R11, and the other end of the resistor R11 is connected to the two ends of the N-MOSFET U3 of the control circuit 4.

[0036] The voltage setting regulation circuit 5 mainly uses the superposition theorem to superimpose the current sharing regulation signal on the voltage setting signal, thereby regulating the output voltage and indirectly regulating the output current. The principle is: when the output voltage setting PWMV signal of the single chip microcomputer passes through two-stage filtering and voltage follower, it is superimposed with the current sharing regulation signal of the differential amplifier circuit 3 to jointly regulate the output voltage of each charging module, thereby regulating the output current of each charging module.

[0037] The above-mentioned specific implementation modes are preferred embodiments of the present invention and cannot be used to limit the present invention. Any other changes or other equivalent replacement methods that do not deviate from the technical solution of the present invention are included in the protection scope of the present invention.

Claims

1. A modular adaptive current sharing circuit, characterized in that: It includes a current detection amplifier circuit, a current sharing bus module, a differential amplifier circuit, a control circuit and a voltage setting adjustment circuit. The current detection amplifier circuit is connected to a single charging module, the current detection amplifier circuit is connected to the current sharing bus module through an isolation resistor R14, the current detection amplifier circuit is connected to the differential amplifier circuit through a first filter circuit, the current sharing bus module is connected to multiple charging modules, the current sharing bus module is connected to the differential amplifier circuit through a second filter circuit, and the differential amplifier circuit is connected to the voltage setting adjustment circuit through the control circuit.

2. The modular adaptive current sharing circuit according to claim 1, characterized in that: The current detection amplifier circuit includes capacitor C4, capacitor C5, capacitor C6, resistor R6, resistor R7, resistor R8, resistor R12 and operational amplifier U2-C. The positive terminal of the charging module, one end of the resistor R6 and one end of the capacitor C4 are all connected to one end of the resistor R7, the negative terminal of the charging module, the other end of the resistor R6 and the other end of the capacitor C4 are all connected to one end of the resistor R12, the 10th end of the operational amplifier U2-C is respectively connected to one end of the capacitor C5 and the other end of the resistor R12, the 9th end of the operational amplifier U2-C is respectively connected to the other end of the resistor R7, the other end of the capacitor C5, one end of the resistor R8 and one end of the capacitor C6, and the 8th end of the operational amplifier U2-C is respectively connected to the other end of the capacitor C6, the other end of the resistor, the first filter circuit and the isolation resistor R14.

3. The modular adaptive current sharing circuit according to claim 2, characterized in that: The current signal amplification ratio of the current detection amplifier circuit is 1+resistance value of resistor R8 / resistance value of resistor R7.

4. The modular adaptive current sharing circuit according to claim 1, characterized in that: The differential amplifier circuit includes an operational amplifier U2-A, an operational amplifier U2-B, an operational amplifier U2-D, a capacitor C8, a capacitor C9, a capacitor C10, a resistor R10, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20 and a resistor R21. End 1 of the operational amplifier U2-A is respectively connected to one end of the resistor R18 and one end of the resistor R19, ends 2 of the operational amplifier U2-A are respectively connected to one end of the resistor R16 and the other end of the resistor R18, ends 3 of the operational amplifier U2-A are connected to the first filter circuit, ends 4 of the operational amplifier U2-A are respectively connected to the positive terminal of the 12V voltage and one end of the capacitor C8, the other end of the capacitor C8 and ends 11 of the operational amplifier U2-A are both grounded, and the operational amplifier U2-B The 5th end of the operational amplifier U2-B is connected to the second filtering circuit, the 6th end of the operational amplifier U2-B is respectively connected to the other end of the resistor R16 and one end of the resistor R17, the 7th end of the operational amplifier U2-B is respectively connected to the other end of the resistor R17 and one end of the R20, the 12th end of the operational amplifier U2-D is respectively connected to the other end of the resistor R20, one end of the resistor R21 and the control circuit, the other end of the resistor R21 is grounded, the 13th end of the operational amplifier U2-D is respectively connected to the other end of R19, one end of the resistor R10 and the other end of the capacitor C9, the 14th end of the operational amplifier U2-D is respectively connected to the other end of the capacitor C9, one end of the capacitor C10 and the control circuit, and the other end of the resistor R10 is connected to the other end of the capacitor C10.

5. The modularized adaptive current sharing circuit according to claim 1, characterized in that: The control circuit includes a resistor R22, a resistor R23, a resistor R24, a resistor R25, an N-MOSFET U3, a P-MOSFET U5 and a transistor Q1. One end of the N-MOSFET U3 is respectively connected to one end of the P-MOSFET U5, one end of the resistor R23 and three ends of the transistor Q1. The other end of the resistor R23 is connected to the positive terminal of the 12V voltage. Two ends of the N-MOSFET U3 are connected to the voltage setting adjustment circuit. Three ends of the N-MOSFET U3 are connected to the differential amplifier circuit. Two ends of the P-MOSFET U5 are connected to the positive terminal of the 12V voltage. Three ends of the P-MOSFET U5 are connected to the differential amplifier circuit through the resistor R22. Two ends of the transistor Q1 and one end of the resistor R24 ​​are grounded. The other end of the resistor R24 ​​and one end of the transistor Q1 are connected to one end of the resistor R25. The R25 is connected to the CS-CTR signal terminal.

6. The modular adaptive current sharing circuit according to claim 1, characterized in that: The voltage setting adjustment circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R11, a capacitor C1, a capacitor C2, a capacitor C3 and a voltage follower U1-A, one end of the resistor R2 is respectively connected to the PWMV signal end and one end of the resistor R1, the other end of the resistor R2 is respectively connected to one end of the capacitor C1 and one end of the resistor R3, the other end of the resistor R3 is respectively connected to one end of the capacitor C2 and one end of the resistor R4, and the other end of the resistor R4 is connected to the three ends of the voltage follower U1-A. The two ends of the voltage follower U1-A are respectively connected to the one end of the voltage follower U1-A and one end of the resistor R5, the other end of the resistor R1, the other end of the capacitor C1, the other end of the capacitor C2, the other end of the capacitor C3 and the four ends of the voltage follower U1-A are all grounded, the eight ends of the voltage follower U1-A and one end of the capacitor C3 are both connected to the positive terminal of the 12V voltage, the other end of the resistor R5 is respectively connected to the V_SET end and one end of the resistor R11, and the other end of the resistor R11 is connected to the control circuit.

7. The modular adaptive current sharing circuit according to claim 1, characterized in that: The current sharing bus module includes a current sharing bus interface J1, an ESD electrostatic protection device U4, a capacitor C11, a capacitor C12, a resistor R13 and a common-mode filter inductor L1. One end of the current sharing bus interface J1 is respectively connected to two ends of the ESD electrostatic protection device U4, one end of the capacitor C11 and three ends of the common-mode filter inductor L1, two ends of the current sharing bus interface J1 are respectively connected to one end of the ESD electrostatic protection device U4, the other end of the capacitor C11 and two ends of the common-mode filter inductor L1, three ends of the ESD electrostatic protection device U4 are grounded, one end of the common-mode filter inductor L1 is respectively connected to one end of the resistor R13 and one end of the capacitor C12, the other end of the resistor C13 and the other end of the capacitor C12 are both grounded, and four ends of the common-mode filter inductor L1 are respectively connected to the isolation resistor R14 and the second filter circuit.

8. The modular adaptive current sharing circuit according to claim 1, characterized in that: The first filtering circuit includes a resistor R9 and a capacitor C7, one end of the resistor R9 is connected to the current detection amplifier circuit, the other end of the resistor R9 is respectively connected to one end of the capacitor C7 and the differential amplifier circuit, and the other end of the capacitor C7 is grounded.

9. The modular adaptive current sharing circuit according to claim 1, characterized in that: The second filtering circuit includes a resistor R15 and a capacitor C13, one end of the resistor R15 is connected to the current detection amplifier circuit, the other end of the resistor R15 is respectively connected to one end of the capacitor C13 and the differential amplifier circuit, and the other end of the capacitor C13 is grounded.

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