A current balancing circuit and power supply

Abstract

The present application provides a current balancing circuit and power supply, which are arranged at the input end of the current detection amplifier of the current balancing controller, and are used to generate a bias voltage. When no-load or light-loaded, the output voltage of the current detection amplifier is made higher than a predetermined driving voltage, thereby avoiding misoperation of the current control loop and causing error voltage to be generated, thereby ensuring the accuracy of the output voltage of the current balancing controller.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a current balancing circuit and a power supply. Background Art

[0002] In high-power, low-voltage, and high-current application scenarios, multiple power modules can be connected in parallel to improve system reliability. Each power module only needs to output a small amount of power, and the total power achieved can meet the power supply needs. Multiple parallel power modules generally use a current balancing controller to achieve current balancing control, so that multiple power modules share the load. At present, some current balancing controllers can achieve good current balancing effects when fully loaded, but when unloaded or lightly loaded, the output voltage will drift high. Summary of the invention

[0003] In view of this, the purpose of the present application is to provide a current balancing circuit and a power supply, which can solve the problem of high output voltage of the current balancing controller when it is unloaded or lightly loaded.

[0004] Based on the above purpose, the present application provides a current balancing circuit, which is arranged at the input end of the current detection amplifier of the current balancing controller, and is used to generate a bias voltage, so that when it is unloaded or lightly loaded, the output voltage of the current detection amplifier is higher than a predetermined driving voltage.

[0005] Optionally, the current balancing circuit includes a controllable precision voltage-stabilizing source, the anode of the controllable precision voltage-stabilizing source is connected to the second end of the current detection resistor, the cathode of the controllable precision voltage-stabilizing source is connected to the positive output end of the power supply module through resistor R2, the cathode of the controllable precision voltage-stabilizing source is connected to the in-phase input end of the current detection amplifier through resistor R71, the reference end of the controllable precision voltage-stabilizing source is connected to the second end of the current detection resistor through capacitor C4, and the negative output end of the power supply module is connected to the first end of the current detection resistor.

[0006] Optionally, the current balancing circuit includes a pull-up resistor R72, and the positive output terminal of the power module is connected to the in-phase input terminal of the current detection amplifier through the resistor R72.

[0007] Optionally, the current balancing circuit includes a controllable precision voltage-stabilizing source and a resistor R92, the anode of the controllable precision voltage-stabilizing source is connected to the negative compensation output terminal of the power module, the cathode and reference terminal of the controllable precision voltage-stabilizing source are connected to the first end of the parallel resistor R8 and capacitor C3, the second end of the parallel resistor R8 and capacitor C3 is connected to the in-phase input terminal of the current detection amplifier, the cathode of the controllable precision voltage-stabilizing source is connected to the positive output terminal of the power module through the resistor R92, and the current detection resistor is connected to the negative output terminal of the power module.

[0008] Optionally, the current balancing circuit includes a controllable precision voltage-stabilizing source and a resistor R92, the anode of the controllable precision voltage-stabilizing source is connected to the negative compensation output terminal of the power supply module, the cathode, the reference terminal and the first end of the parallel resistor R8 and capacitor C3 are connected, the second end of the parallel resistor R8 and capacitor C3 is connected to the positive output terminal of the power supply module through the resistor R5, the first end of the current detection resistor is connected to the positive output terminal of the power supply module, and the second end of the current detection resistor is connected to the inverting input terminal of the current detection amplifier through the resistor R3.

[0009] Optionally, the current balancing circuit includes a Zener diode and a resistor R93, the cathode of the Zener diode is connected to the first end of the resistor R8 and the capacitor C3 in parallel, the second end of the resistor R8 and the capacitor C3 in parallel is connected to the in-phase input end of the current detection amplifier, and the cathode of the Zener diode is connected to the positive output end V+ of the power module through the resistor R93.

[0010] Optionally, the current balancing circuit includes a voltage regulator and a resistor R93, the cathode of the voltage regulator is connected to the first end of the parallel resistor R8 and capacitor C3, the second end of the parallel resistor R8 and capacitor C3 is connected to the in-phase input end of the current detection amplifier, the second end of the parallel resistor R8 and capacitor C3 is connected to the positive output end of the power module through the resistor R5, the cathode of the voltage regulator is connected to the positive output end of the power module through the resistor R93, the first end of the current detection resistor is connected to the positive output end of the power module, and the second end of the current detection resistor is connected to the inverting input end of the current detection amplifier through the resistor R3.

[0011] Optionally, the current equalizing circuit includes a diode and a resistor R94, the anode of the diode is connected to the first end of the resistor R8 and the capacitor C3 in parallel, the second end of the resistor R8 and the capacitor C3 in parallel is connected to the in-phase input terminal of the current detection amplifier, the anode of the diode is connected to the positive output terminal of the power supply module through the resistor R94, and the cathode of the diode is connected to the negative compensation output terminal of the power supply module.

[0012] Optionally, the current equalizing circuit includes a transistor, resistors R95, R11 and R12, the collector and emitter of the transistor are connected to the negative compensation output terminal of the power module, the base of the transistor is connected to the first end of the parallel resistor R8 and capacitor C3, the second ends of the parallel resistor R8 and capacitor C3 are connected to the in-phase input terminal of the current detection amplifier, the base of the transistor is connected to one end of the resistor R95 and one end of the resistor R11 through the resistor R12, the other end of the resistor R95 is connected to the positive output terminal of the power module, and the other end of the resistor R11 is connected to the negative compensation output terminal of the power module.

[0013] The embodiments of the present specification also provide a power supply, including the current balancing circuit.

[0014] From the above, it can be seen that the current balancing circuit and power supply provided in the present application are arranged at the input end of the current detection amplifier of the current balancing controller, and are used to generate a bias voltage. When no-load or light-loaded, the output voltage of the current detection amplifier is higher than the predetermined driving voltage, thereby avoiding misoperation of the current control loop and causing error voltage to be generated, thereby ensuring the accuracy of the output voltage of the current balancing controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A schematic diagram of an application circuit of a current balance controller according to some embodiments;

[0017] Figure 2 A schematic diagram of a current balancing circuit according to an embodiment of the present application;

[0018] Figure 3 This is a schematic diagram of a current sharing circuit according to a second embodiment of the present application;

[0019] Figure 4 This is a schematic diagram of a current balancing circuit according to a third embodiment of the present application;

[0020] Figure 5 This is a schematic diagram of a current sharing circuit according to a fourth embodiment of the present application;

[0021] Figure 6 This is a schematic diagram of a current sharing circuit according to a fifth embodiment of the present application;

[0022] Figure 7 This is a schematic diagram of a current balancing circuit according to a sixth embodiment of the present application;

[0023] Figure 8 This is a schematic diagram of a current balancing circuit according to a seventh embodiment of the present application;

[0024] Fig. 9 This is a schematic diagram of a current sharing circuit according to an eighth embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0026] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0027] Figure 1 The figure shows an application circuit diagram of the UCC29002 current sharing controller. The current sharing controller has a good current sharing effect and high accuracy when fully loaded, but when unloaded or lightly loaded, the output voltage will drift high. This is because: when unloaded or lightly loaded, the output voltage V of the current sampling circuit composed of the current detection amplifier and the current sharing drive amplifier is CSO Theoretically, it should be zero, but due to the internal mechanism of the chip, the actual output is an error voltage between 0-150 mV. The error voltage below 150 mV cannot be transmitted to the current sharing bus. After being superimposed on the voltage adjustment loop inside the chip, the output voltage is high.

[0028] In view of the above reasons, an embodiment of the present application provides a current balancing circuit, which is arranged at the input end of the current detection amplifier of the current balancing controller, and is used to generate a bias voltage. When it is unloaded or lightly loaded, the output voltage of the current detection amplifier is higher than the predetermined driving voltage, thereby avoiding the generation of error voltage and ensuring the accuracy of the current balancing controller.

[0029] The present application is described in detail below with reference to the accompanying drawings and embodiments.

[0030] Combination Figure 1As shown, the UCC29002 current sharing controller includes a current detection amplifier, a current sharing drive amplifier, a current sharing detection amplifier, an error amplifier, an adjustment amplifier, etc. The CS- and CS+ terminals of the chip are respectively the inverting input terminal and the non-inverting input terminal of the current detection amplifier, the CSO terminal is the output terminal of the current sampling circuit, and the VDD terminal is the power input terminal of the controller. The negative output terminal V- of the power module is connected to the inverting input terminal CS- of the current detection amplifier through the resistor R3, the negative output terminal V- of the power module is connected to the first end of the current detection resistor R1, the second end of the current detection resistor R1 is connected to the non-inverting input terminal CS+ of the current detection amplifier through the resistor R5, the second end of the current detection resistor R1 is connected to the first end of the parallel resistor R8 and the capacitor C3, the second end of the parallel resistor R8 and the capacitor C3 is connected to the non-inverting input terminal CS+ of the current detection amplifier, the output terminal CSO of the current sampling circuit is connected to one end of the parallel resistor R6 and the capacitor C1, the other end of the parallel resistor R6 and the capacitor C1 is connected to the inverting input terminal CS- of the current detection amplifier, the positive output terminal V+ of the power module is connected to the bias power input terminal VDD, and the negative compensation output terminal SENSE- of the power module is connected to the power ground terminal GND of the current equalizing controller, wherein R3=R5, R6=R8. The specific circuit structure and principle of the current equalizing controller are not described in detail.

[0031] like Figure 2 As shown, a current balancing circuit of an embodiment of the present application includes a controllable precision voltage stabilizing source N11, the anode of the controllable precision voltage stabilizing source N11 is connected to the second end of the current detection resistor R1, the cathode of the controllable precision voltage stabilizing source N11 is connected to the positive output terminal V+ of the power module through the resistor R2, the cathode of the controllable precision voltage stabilizing source N11 is connected to the in-phase input terminal CS+ of the current detection amplifier through the resistor R71, and the reference end of the controllable precision voltage stabilizing source N11 is connected to the second end of the current detection resistor R1 through the capacitor C4. Under normal temperature, under the action of the controllable precision voltage stabilizing source, if the second end of the current detection resistor R1 is the power reference point, the reference voltage V REF =2.495V, the output voltage of the current sampling circuit is V CSO for:

[0032] V CSO =ΔV×(R6 / R3)+V REF ×(1+(R6 / R3))×(R5 / / R8) / (R5 / / R8+R71) (1)

[0033] In formula (1), ΔV is the voltage difference across the current detection resistor R1. When no load or light load occurs, ΔV = 0. By configuring resistors R6, R3, R5, R8, and R71, the second part V on the right side of the formula is REF×(1+(R6 / R3))×(R5 / / R8) / (R5 / / R8+R7) is greater than the predetermined driving voltage, that is, the output voltage V CSO Greater than a predetermined driving voltage. For the UCC29002 type current sharing controller, the predetermined driving voltage is a 150 millivolt voltage that can transmit the voltage to the current sharing bus.

[0034] like Figure 3 As shown, the current balancing circuit of the second embodiment of the present application includes a pull-up resistor R72. The positive output terminal V+ of the power module is connected to the non-inverting input terminal CS+ of the current detection amplifier through the resistor R72. The pull-up resistor R72 is used to provide a bias voltage for the current detection amplifier. The output voltage V CSO for:

[0035] V CSO =ΔV×(R6 / R3)+V + ×(1+(R6 / R3))×(R5 / / R8) / (R5 / / R8+R72) (2)

[0036] V + is the output voltage of the positive output terminal of the power module. By configuring resistors R6, R3, R5, R8, and R72, the second part of the right side of the formula V + ×(1+(R6 / R3))×(R5 / / R8) / (R5 / / R8+R72) is greater than the predetermined driving voltage, that is, the output voltage V CSO Greater than a predetermined driving voltage.

[0037] like Figure 4 As shown, the current balancing circuit of the third embodiment of the present application includes a controllable precision voltage stabilizing source N12 and a resistor R92. The anode of the controllable precision voltage stabilizing source N12 is connected to the negative compensation output terminal SENSE- of the power module. The cathode and reference terminal of the controllable precision voltage stabilizing source N12 are connected to the first end of the parallel resistor R8 and capacitor C3. The cathode of the controllable precision voltage stabilizing source N12 is connected to the positive output terminal V+ of the power module through the resistor R92. The output voltage V of the current sampling circuit CSO for:

[0038]

[0039] By connecting the first end of the parallel resistor R8 and the capacitor C3 to the controllable precision voltage regulator N12, the bias voltage V is generated by the controllable precision voltage regulator N12. REF , by adjusting the bias voltage V REF , so that the output voltage V CSO Greater than a predetermined driving voltage.

[0040] like Figure 5As shown, the current balancing circuit of the fourth embodiment of the present application is to use Figure 4 The current balancing circuit shown in the figure realizes high-end detection. The second end of the parallel resistor R8 and capacitor C3 is connected to the positive output terminal V+ of the power module through the resistor R5. The first end of the current detection resistor R1 is connected to the positive output terminal V+ of the power module. The second end of the current detection resistor R1 is connected to the inverting input terminal CS- of the current detection amplifier through the resistor R3. By adjusting the bias voltage V generated by the controllable precision voltage regulator N12 REF , so that the output voltage V CSO Greater than a predetermined driving voltage.

[0041] like Figure 6 As shown, the current balancing circuit of the fifth embodiment of the present application includes a voltage regulator tube V9 and a resistor R93, the cathode of the voltage regulator tube V9 is connected to the first end of the resistor R8 and the capacitor C3 connected in parallel, and the cathode of the voltage regulator tube V9 is connected to the positive output terminal V+ of the power module through the resistor R93, and the bias voltage generated by the voltage regulator tube V9 is adjusted so that the output voltage V CSO Greater than a predetermined driving voltage.

[0042] like Figure 7 As shown, the current balancing circuit of the sixth embodiment of the present application is to use Figure 6 The current balancing circuit shown in the figure realizes high-end detection. By adjusting the bias voltage generated by the controllable precision voltage regulator V9, the output voltage V CSO Greater than a predetermined driving voltage.

[0043] like Figure 8 As shown, the current balancing circuit of the seventh embodiment of the present application includes a diode V6 and a resistor R94, the anode of the diode V6 is connected to the resistor R8 and the first end of the capacitor C3 in parallel, the anode of the diode V6 is connected to the positive output terminal V+ of the power module through the resistor R94, and the cathode of the diode V6 is connected to the negative compensation output terminal SENSE- of the power module. By adjusting the bias voltage of the diode V6, the output voltage V CSO Greater than a predetermined driving voltage.

[0044] like Fig. 9 As shown, the current equalizing circuit of the eighth embodiment of the present application includes a transistor V8, resistors R95, R11, and R12. The collector and emitter of the transistor V8 are connected to the negative compensation output terminal SENSE- of the power module, the base of the transistor V8 is connected to the resistor R8 and the first end of the capacitor C3 in parallel, the base of the transistor V8 is connected to one end of the resistor R95 and one end of the resistor R11 through the resistor R12, the other end of the resistor R95 is connected to the positive output terminal V+ of the power module, and the other end of the resistor R11 is connected to the negative compensation output terminal SENSE- of the power module.

[0045] The current balancing circuit provided in the embodiment of the present application is arranged at the input end of the current detection amplifier of the current balancing controller, and is used to generate a bias voltage, so that the output voltage of the current sampling circuit is greater than the predetermined driving voltage under no-load or light-load conditions, thereby eliminating the error voltage less than the predetermined driving voltage, and avoiding the problem that the output voltage of the current balancing controller drifts high and affects the accuracy. Moreover, the current balancing circuit provided requires a small number of components, has low cost, and is simple to implement, and is suitable for popularization and application.

[0046] The various circuit forms provided in this application can realize high-end detection (such as Figure 5 , 7 , 8, and 9, the current detection resistor R1 is connected to the positive output terminal of the power module) and the low-end detection (such as Figure 2 , 3 , 4, and 6 show examples in which the current detection resistor R1 is connected to the negative output terminal of the power module. The specific forms of each circuit form to achieve high-end detection and low-end detection are no longer listed one by one.

[0047] In some methods, a TL431 controllable precision voltage regulator can be used to generate a bias voltage with high precision, which can avoid the problem of error voltage in the output voltage caused by different bias voltages applied to the power modules connected in parallel.

[0048] Another aspect of the present application provides a power supply, including multiple power modules connected in parallel, and the multiple power modules use a current balancing controller to share the load. The current detection amplifier input end of the current balancing controller is provided with a bias circuit for generating a bias voltage. When no-load or light-loaded, the output voltage of the current detection amplifier is higher than a predetermined driving voltage. The bias voltage applied by each power module must be consistent and have high accuracy to avoid introducing errors into the power supply system.

[0049] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0050] In addition, to simplify the description and discussion, and in order not to make the embodiments of the present application difficult to understand, the known power supply / ground connection with the integrated circuit (IC) chip and other components may or may not be shown in the provided drawings. In addition, the device can be shown in the form of a block diagram to avoid making the embodiments of the present application difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform to be implemented in the embodiments of the present application (that is, these details should be fully within the scope of understanding of those skilled in the art). In the case of elaborating specific details (e.g., circuits) to describe exemplary embodiments of the present application, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details or when these specific details are changed. Therefore, these descriptions should be considered to be illustrative rather than restrictive.

[0051] Although the present application has been described in conjunction with specific embodiments of the present application, many replacements, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.

[0052] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A current sharing circuit, It is characterized in that An input terminal of a current detection amplifier of the current balancing controller is provided to generate a bias voltage so that the output voltage of the current detection amplifier is higher than a predetermined driving voltage when the current is unloaded or lightly loaded; It also includes a controllable precision voltage-stabilizing source, wherein the anode of the controllable precision voltage-stabilizing source is connected to the second end of the current detection resistor R1, the cathode of the controllable precision voltage-stabilizing source is connected to the positive output end of the power module through the resistor R2, the cathode of the controllable precision voltage-stabilizing source is connected to the in-phase input end of the current detection amplifier through the resistor R71, the reference end of the controllable precision voltage-stabilizing source is connected to the second end of the current detection resistor R1 through the capacitor C4, and the negative output end of the power module is connected to the first end of the current detection resistor R1; The current sharing controller includes a current detection amplifier, a current sharing drive amplifier, a current sharing detection amplifier, an error amplifier, and an adjustment amplifier; the CS- and CS+ terminals of the chip are the inverting input terminal and the non-inverting input terminal of the current detection amplifier, respectively; the CSO terminal of the chip is the output terminal of the current sampling circuit; and the VDD terminal of the chip is the power input terminal of the controller; the negative output terminal V- of the power module is connected to the inverting input terminal CS- of the current detection amplifier through a resistor R3, the negative output terminal V- of the power module is connected to the first terminal of the current detection resistor R1, the second terminal of the current detection resistor R1 is connected to the non-inverting input terminal CS+ of the current detection amplifier through a resistor R5, and the second terminal of the current detection resistor R1 is connected to the parallel resistor R8 and the capacitor C 3, the second ends of the parallel resistor R8 and capacitor C3 are connected to the in-phase input terminal CS+ of the current detection amplifier, the first ends of the parallel resistor R8 and capacitor C3 are the current output terminals, the second ends of the parallel resistor R8 and capacitor C3 are the current input terminals, the output terminal CSO of the current sampling circuit is connected to one end of the parallel resistor R6 and capacitor C1, the other end of the parallel resistor R6 and capacitor C1 is connected to the inverting input terminal CS- of the current detection amplifier, the positive output terminal V+ of the power module is connected to the VDD terminal, the negative compensation output terminal SENSE- of the power module is connected to the power ground terminal GND of the current sharing controller, wherein, resistor R3=resistor R5, resistor R6=resistor R8.

2. The current balancing circuit according to claim 1, It is characterized in that A pull-up resistor R72 is included, and the positive output terminal of the power module is connected to the non-inverting input terminal of the current detection amplifier through the resistor R72.

3. The current balancing circuit according to claim 1, It is characterized in that It includes a controllable precision voltage-stabilizing source and a resistor R92, wherein the anode of the controllable precision voltage-stabilizing source is connected to the negative compensation output terminal of the power module, the cathode and the reference terminal of the controllable precision voltage-stabilizing source are connected to the first end of the parallel resistor R8 and the capacitor C3, the second end of the parallel resistor R8 and the capacitor C3 is connected to the in-phase input terminal of the current detection amplifier, the cathode of the controllable precision voltage-stabilizing source is connected to the positive output terminal of the power module through the resistor R92, and the current detection resistor is connected to the negative output terminal of the power module.

4. The current balancing circuit according to claim 1, It is characterized in that It includes a controllable precision voltage-stabilizing source and a resistor R92, wherein the anode of the controllable precision voltage-stabilizing source is connected to the negative compensation output terminal of the power module, the cathode and the reference terminal of the controllable precision voltage-stabilizing source are connected to the first end of the parallel resistor R8 and the capacitor C3, the second end of the parallel resistor R8 and the capacitor C3 is connected to the positive output terminal of the power module through the resistor R5, the first end of the current detection resistor is connected to the positive output terminal of the power module, and the second end of the current detection resistor is connected to the inverting input terminal of the current detection amplifier through the resistor R3.

5. The current balancing circuit according to claim 1, It is characterized in that It includes a voltage regulator tube and a resistor R93, the cathode of the voltage regulator tube is connected to the first end of the parallel resistor R8 and the capacitor C3, the second end of the parallel resistor R8 and the capacitor C3 is connected to the in-phase input end of the current detection amplifier, and the cathode of the voltage regulator tube is connected to the positive output end V+ of the power module through the resistor R93.

6. The current balancing circuit according to claim 1, It is characterized in that It includes a voltage regulator tube and a resistor R93, the cathode of the voltage regulator tube is connected to the first end of the parallel resistor R8 and the capacitor C3, the second end of the parallel resistor R8 and the capacitor C3 is connected to the in-phase input end of the current detection amplifier, the second end of the parallel resistor R8 and the capacitor C3 is connected to the positive output end of the power module through the resistor R5, the cathode of the voltage regulator tube is connected to the positive output end of the power module through the resistor R93, the first end of the current detection resistor is connected to the positive output end of the power module, and the second end of the current detection resistor is connected to the inverting input end of the current detection amplifier through the resistor R3.

7. The current balancing circuit according to claim 1, It is characterized in that It includes a diode and a resistor R94, the anode of the diode is connected to the first end of the parallel resistor R8 and the capacitor C3, the second end of the parallel resistor R8 and the capacitor C3 is connected to the in-phase input end of the current detection amplifier, the anode of the diode is connected to the positive output end of the power module through the resistor R94, and the cathode of the diode is connected to the negative compensation output end of the power module.

8. The current balancing circuit according to claim 1, It is characterized in that It includes a transistor, resistors R95, R11 and R12, the collector and emitter of the transistor are connected to the negative compensation output end of the power module, the base of the transistor is connected to the first end of the parallel resistor R8 and capacitor C3, the second ends of the parallel resistor R8 and capacitor C3 are connected to the in-phase input end of the current detection amplifier, the base of the transistor is connected to one end of the resistor R95 and one end of the resistor R11 through the resistor R12, the other end of the resistor R95 is connected to the positive output end of the power module, and the other end of the resistor R11 is connected to the negative compensation output end of the power module.

9. A power source, It is characterized in that The invention comprises a current balancing circuit as described in any one of claims 1 to 8.

Images