Current sharing circuit and current sharing power supply system

Abstract

The invention provides a current sharing circuit and a current sharing power supply system, and relates to the field of power supply. The problem that an existing power supply system cannot adopt two different power supplies at the same time for current-sharing power supply is solved. The current sharing circuit comprises a control circuit electrically connected with a first power supply and a second power supply, wherein the output end of the control circuit is electrically connected with power receiving equipment; the first current detection circuit and the second current detection circuit are electrically connected with the first power supply and the second power supply through the control circuit respectively; the current comparison circuit is electrically connected with the first current detection circuit and the second current detection circuit, and the output end of the current comparison circuit is electrically connected with the control circuit; in the use state, the control circuit adjusts the output current of the first power supply or the output current of the second power supply according to the level signal output by the current comparison circuit until the two currents are the same, and outputs a stable current to the powered device. According to the scheme of the invention, two different power supply devices can supply power to the power receiving device at the same time under the same current.

Description

Technical Field

[0001] The present invention relates to the field of power supply, and particularly to a current sharing circuit and a current sharing power supply system. Background Art

[0002] In the prior art, power receiving devices mostly use a single power supply device for power supply. When two power supply devices are used to supply power to a power receiving device simultaneously, due to the different outputs of the two power supply devices, it often causes the aging of the power supply line at the end with a large long-term load, thus causing a series of problems. Summary of the Invention

[0003] The present invention provides a current sharing circuit and a current sharing power supply system, which solve the problem that the existing power supply system cannot perform current sharing power supply with two different power supplies simultaneously.

[0004] To solve the above technical problems, the technical solution of the present invention is as follows:

[0005] An embodiment of the present invention provides a current sharing circuit, including:

[0006] A control circuit electrically connected to a first power supply and a second power supply, and an output end of the control circuit is electrically connected to a power receiving device;

[0007] A first current detection circuit and a second current detection circuit respectively electrically connected to the first power supply and the second power supply through the control circuit;

[0008] A current comparison circuit electrically connected to the first current detection circuit and the second current detection circuit, and an output end of the current comparison circuit is electrically connected to the control circuit;

[0009] Wherein, the first current detection circuit is used to detect first output current data of the first power supply, and the second current detection circuit is used to detect second output current data of the second power supply; the current comparison circuit is used to compare the first output current data and the second output current data, and output a level signal according to the comparison result;

[0010] In the use state, the control circuit adjusts the output current of the first power supply or the output current of the second power supply according to the level signal output by the current comparison circuit until the two are the same, and outputs a stable current to the power receiving device.

[0011] Optionally, the control circuit includes:

[0012] A first power supply conversion circuit electrically connected to the first power supply, and an output end of the first power supply conversion circuit is electrically connected to the power receiving device;

[0013] A second power supply conversion circuit electrically connected to the second power supply, and an output end of the second power supply conversion circuit is electrically connected to the power receiving device;

[0014] Among them, the first current detection circuit is electrically connected to the output end of the first power conversion circuit; the second current detection circuit is electrically connected to the output end of the second power conversion circuit;

[0015] The input end of the current comparison circuit is electrically connected to the first current detection circuit and the second current detection circuit, and the output end is electrically connected to the second power conversion circuit;

[0016] Among them, the first current detection circuit detects the first output current data of the first power supply through the first power conversion circuit, and the second current detection circuit detects the second output current data of the second power supply through the second power conversion circuit;

[0017] In the usage state, the second power conversion circuit adjusts the output current at the output end of the second power conversion circuit according to the level signal output by the current comparison circuit until it is the same as the output current at the output end of the first power conversion circuit.

[0018] Optionally, the first power conversion circuit includes:

[0019] The first power conversion module;

[0020] Among them, the first pin of the first power conversion module is electrically connected to the first power supply;

[0021] The second pin of the first power conversion module is grounded;

[0022] The fifth pin of the first power conversion module is electrically connected to the power receiving device through a first resistor and a first diode.

[0023] Optionally, the second power conversion circuit includes:

[0024] The second power conversion module;

[0025] Among them, the first pin of the second power conversion module is electrically connected to the second power supply;

[0026] The second pin of the second power conversion module is grounded;

[0027] The fifth pin of the second power conversion module is electrically connected to the power receiving device through a second resistor and a second diode;

[0028] The fourth pin of the second power conversion module is electrically connected to the input end of the current comparison circuit.

[0029] Optionally, the first current detection circuit includes:

[0030] The first detection chip;

[0031] The seventh pin of the first detection chip is electrically connected to the input end of the first resistor through a third resistor;

[0032] The eighth pin of the first detection chip is electrically connected to the output end of the first resistor through a fourth resistor;

[0033] The eighth pin of the first detection chip is electrically connected to the seventh pin of the first detection chip through a first capacitor;

[0034] The second pin of the first detection chip is electrically connected to the current comparison circuit through a fifth resistor and grounded through a fifth capacitor.

[0035] Optionally, the first pin of the first detection chip is electrically connected to a third power supply and grounded through a second capacitor;

[0036] The third pin of the first detection chip is connected to the second pin of the first detection chip through a sixth resistor and grounded through a seventh resistor;

[0037] The fourth pin of the first detection chip is grounded;

[0038] The sixth pin of the first detection chip is grounded through a fifteenth resistor;

[0039] The fifth pin of the first detection chip is grounded through a sixth capacitor and electrically connected to the third power supply through an eighth resistor.

[0040] Optionally, the second current detection circuit includes:

[0041] A second detection chip;

[0042] The seventh pin of the second detection chip is electrically connected to the input end of the second resistor through a ninth resistor;

[0043] The eighth pin of the second detection chip is electrically connected to the output end of the second resistor through a tenth resistor;

[0044] The eighth pin of the second detection chip is electrically connected to the seventh pin of the second detection chip through a third capacitor;

[0045] The second pin of the second detection chip is electrically connected to the current comparison circuit through an eleventh resistor and grounded through a seventh capacitor.

[0046] Optionally, the first pin of the second detection chip is electrically connected to a third power supply and grounded through a fourth capacitor;

[0047] The third pin of the second detection chip is connected to the second pin of the second detection chip through a twelfth resistor and grounded through a thirteenth resistor;

[0048] The fourth pin of the second detection chip is grounded;

[0049] The sixth pin of the second detection chip is grounded through the sixteenth resistor;

[0050] The fifth pin of the second detection chip is grounded through the eighth capacitor and is electrically connected to the third power supply through the fourteenth resistor.

[0051] Optionally, the current comparison circuit includes:

[0052] An operational amplifier;

[0053] The third pin of the operational amplifier is electrically connected to the second current detection circuit through the seventeenth resistor;

[0054] The second pin of the operational amplifier is electrically connected to the first current detection circuit through the eighteenth resistor and is electrically connected to the first pin of the operational amplifier through the nineteenth resistor;

[0055] The third pin of the operational amplifier is electrically connected to the second pin of the operational amplifier through the ninth capacitor, and the third pin of the operational amplifier is electrically connected to the fifth pin of the second power conversion module through the nineteenth resistor;

[0056] The fourth pin of the operational amplifier is grounded;

[0057] The first pin of the operational amplifier is electrically connected to the fourth pin of the second power conversion module through the twentieth resistor and the twenty-first resistor;

[0058] The eighth pin of the operational amplifier is electrically connected to the third power supply and is grounded through the tenth capacitor.

[0059] An embodiment of the present invention also provides a current sharing power supply system, including: a first power supply device, a second power supply device, and a power receiving device. The power receiving device is electrically connected to the first power supply device and the second power supply device through a current sharing circuit, and the current sharing circuit is the current sharing circuit described in any one of the above.

[0060] The above solution of the present invention has at least the following beneficial effects:

[0061] The current sharing circuit described in the present invention includes: a control circuit electrically connected to a first power supply and a second power supply, and an output end of the control circuit is electrically connected to a power receiving device; a first current detection circuit and a second current detection circuit respectively electrically connected to the first power supply and the second power supply through the control circuit; a current comparison circuit electrically connected to the first current detection circuit and the second current detection circuit, and an output end of the current comparison circuit is electrically connected to the control circuit; wherein, the first current detection circuit is used for detecting first output current data of the first power supply, and the second current detection circuit is used for detecting second output current data of the second power supply; the current comparison circuit is used for comparing the first output current data and the second output current data, and outputting a level signal according to the comparison result; in the use state, the control circuit adjusts the output current of the first power supply or the output current of the second power supply according to the level signal output by the current comparison circuit until the two are the same, and outputs a stable current to the power receiving device. The simultaneous power supply to the power receiving device by two different power supply devices with the same current is realized. Description of the Drawings

[0062] Figure 1 is a schematic circuit module structure diagram of the current sharing circuit of the present invention;

[0063] Figure 2 is a schematic circuit structure diagram of the control circuit in the current sharing circuit of the present invention;

[0064] Figure 3 is a schematic circuit structure diagram of the first current detection circuit in the current sharing circuit of the present invention;

[0065] Figure 4 is a schematic circuit structure diagram of the second current detection circuit in the current sharing circuit of the present invention;

[0066] Figure 5 is a schematic circuit structure diagram of the current comparison circuit in the current sharing circuit of the present invention. Detailed Embodiment

[0067] The exemplary embodiments of the present invention will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0068] As Figures 1 to 5 shown, an embodiment of the present invention provides a current sharing circuit, including:

[0069] a control circuit electrically connected to a first power supply Vin1 and a second power supply Vin2, and an output end of the control circuit is electrically connected to a power receiving device;

[0070] A first current detection circuit and a second current detection circuit respectively electrically connected to a first power supply Vin1 and a second power supply Vin2 through a control circuit;

[0071] A current comparison circuit electrically connected to the first current detection circuit and the second current detection circuit, and an output end of the current comparison circuit is electrically connected to the control circuit;

[0072] Wherein, the first current detection circuit is used for detecting first output current data of the first power supply Vin1, and the second current detection circuit is used for detecting second output current data of the second power supply Vin1; the current comparison circuit is used for comparing the first output current data and the second output current data, and outputting a level signal according to a comparison result;

[0073] In a use state, the control circuit adjusts the output current of the first power supply Vin1 or the output current of the second power supply Vin2 according to the level signal output by the current comparison circuit until they are the same, and outputs a stable current to a power receiving device.

[0074] The control circuit includes:

[0075] A first power conversion circuit electrically connected to the first power supply Vin1, and an output end of the first power conversion circuit is electrically connected to the power receiving device;

[0076] A second power conversion circuit electrically connected to the second power supply Vin2, and an output end of the second power conversion circuit is electrically connected to the power receiving device;

[0077] Wherein, the first current detection circuit is electrically connected to an output end of the first power conversion circuit; the second current detection circuit is electrically connected to an output end of the second power conversion circuit;

[0078] An input end of the current comparison circuit is electrically connected to the first current detection circuit and the second current detection circuit, and an output end is electrically connected to the second power conversion circuit;

[0079] Wherein, the first current detection circuit detects the first output current data of the first power supply Vin1 through the first power conversion circuit, and the second current detection circuit detects the second output current data of the second power supply Vin1 through the second power conversion circuit;

[0080] In a use state, the second power conversion circuit adjusts the output current of an output end of the second power conversion circuit according to the level signal output by the current comparison circuit until it is the same as the output current of an output end of the first power conversion circuit.

[0081] In this embodiment, the control circuit is used to convert the supply voltages of two different voltages into voltages with the same output amplitude, and measure the current at the same output voltage amplitude, so as to achieve the purpose of comparing the power consumption provided by different power supply modules as long as the current value is detected; at the same time, the control circuit can also adjust the voltage amplitude output by the power conversion circuit by adjusting the voltage value of the FB pin; the current comparison circuit is used to compare the first output current data and the second output current data, and output a level signal according to the comparison result. Specifically, when IAout > IBout (IAout is the first output current data, and IBout is the second output current data), the current comparison circuit outputs a first level signal on the network POEB_VFB, and the first level signal is a voltage decrease. After receiving the level signal, the second power conversion circuit controls the output voltage of the second power supply Vin1 to increase, thereby controlling the output current to increase; when IAout < IBout, the current comparison circuit outputs a second level signal on the network POEB_VFB, and the second level signal is a voltage increase. After receiving the level signal, the second power conversion circuit controls the output voltage of the second power supply Vin1 to decrease, thereby controlling the output current to decrease; when IAout = IBout, the current comparison circuit outputs a third level signal on the network POEB_VFB, and the third level signal is a voltage equality. At this time, after receiving the level signal, the second power conversion circuit no longer adjusts the second power supply, and at the same time, the control circuit controls the first power supply Vin1 and the second power supply Vin2 to stably output the current to the power receiving device as the output current. At this time, the output currents of the first power supply Vin1 and the second power supply Vin2 are the same, so as to achieve the effect of simultaneous power supply of two paths and current sharing, which can ensure that each power supply module shares the same load current, prevent a certain module from overloading, and extend the service life of the power supply module; at the same time, when a certain power supply module fails, the remaining power supply module can be used for separate continuous power supply to avoid system shutdown; when the two power supplies supply power simultaneously, current sharing power supply is realized; the current sharing result can reach 49.8%, and at the same time, the current supply capacity can be effectively increased.

[0082] In this embodiment, the current sharing circuit detects the output currents of the first power supply Vin1 and the second power supply Vin2 in real time, compares the detection results through a current comparison circuit, and outputs different level signals according to the comparison results, so as to realize real-time adjustment of the output currents of the first power supply Vin1 and the second power supply Vin2 in a negative feedback manner until the output currents of the first power supply Vin1 and the second power supply Vin2 are equal or the difference is within a preset range; through this design, simultaneous power supply to the power receiving device by two different power supply devices with the same current is realized, thereby preventing the aging of the circuit caused by different currents during the power supply process, improving the power supply safety, reducing energy loss, and enhancing the energy utilization efficiency of the overall system.

[0083] In an alternative embodiment of the present invention, the first power conversion circuit includes:

[0084] The first power conversion module U1;

[0085] Wherein, the first pin of the first power conversion module U1 is electrically connected to the first power supply Vin1;

[0086] The second pin of the first power conversion module U1 is grounded;

[0087] The fifth pin of the first power conversion module U1 is electrically connected to the power receiving device through the first resistor R953 and the first diode D119.

[0088] In an alternative embodiment of the present invention, the second power conversion circuit includes:

[0089] The second power conversion module U2;

[0090] Wherein, the first pin of the second power conversion module U2 is electrically connected to the second power supply Vin1;

[0091] The second pin of the second power conversion module U2 is grounded;

[0092] The fifth pin of the second power conversion module U2 is electrically connected to the power receiving device through the second resistor R954 and the second diode D120;

[0093] The fourth pin of the second power conversion module U2 is electrically connected to the input end of the current comparison circuit.

[0094] In this embodiment, the fourth pin of the second power conversion module U2 is used to receive the level signal output by the current comparison circuit, and the second power conversion module U2 controls the output of the current of the second power supply Vin1 through this level signal.

[0095] In an alternative embodiment of the present invention, the first current detection circuit includes:

[0096] The first detection chip U3;

[0097] The seventh pin of the first detection chip U3 is electrically connected to the input end of the first resistor R953 through the third resistor R918;

[0098] The eighth pin of the first detection chip U3 is electrically connected to the output end of the first resistor R953 through the fourth resistor R919;

[0099] The eighth pin of the first detection chip U3 is electrically connected to the seventh pin of the first detection chip U3 through the first capacitor C901;

[0100] The second pin of the first detection chip U3 is electrically connected to the current comparison circuit through the fifth resistor R952 and grounded through the fifth capacitor C949.

[0101] In an optional embodiment of the present invention, the first pin of the first detection chip U3 is electrically connected to the third power supply VCC-OP and grounded through the second capacitor C902;

[0102] The third pin of the first detection chip U3 is connected to the second pin of the first detection chip U3 through the sixth resistor R921 and grounded through the seventh resistor R920;

[0103] The fourth pin of the first detection chip U3 is grounded;

[0104] The sixth pin of the first detection chip U3 is grounded through the fifteenth resistor R929;

[0105] The fifth pin of the first detection chip U3 is grounded through the sixth capacitor C923 and electrically connected to the third power supply VCC-OP through the eighth resistor R930.

[0106] In this embodiment, the third power supply VCC-OP is used to supply power to the first current detection circuit to ensure the normal operation of the first current detection circuit; in this embodiment, the first current detection circuit detects the current at both ends of the first resistor R953 in real time based on the principle that different currents output different voltage values, so as to detect the output current of the first power supply Vin1 and input the detected result into the current comparison circuit in real time for current comparison in the current comparison circuit.

[0107] In an optional embodiment of the present invention, the second current detection circuit includes:

[0108] The second detection chip U4;

[0109] The seventh pin of the second detection chip U4 is electrically connected to the input end of the second resistor R954 through the ninth resistor R922;

[0110] The eighth pin of the second detection chip U4 is electrically connected to the output end of the second resistor R954 through the tenth resistor R923;

[0111] The eighth pin of the second detection chip U4 is electrically connected to the seventh pin of the second detection chip U4 through the third capacitor C903;

[0112] The second pin of the second detection chip U4 is electrically connected to the current comparison circuit through the eleventh resistor R951 and grounded through the seventh capacitor C948.

[0113] In an optional embodiment of the present invention, the first pin of the second detection chip U4 is electrically connected to the third power supply VCC-OP and grounded through the fourth capacitor C904;

[0114] The third pin of the second detection chip U4 is connected to the second pin of the second detection chip U4 through the twelfth resistor R925 and grounded through the thirteenth resistor R924;

[0115] The fourth pin of the second detection chip U4 is grounded;

[0116] The sixth pin of the second detection chip U4 is grounded through the sixteenth resistor R927;

[0117] The fifth pin of the second detection chip U4 is grounded through the eighth capacitor C922 and electrically connected to the third power supply VCC-OP through the fourteenth resistor R928.

[0118] In an optional embodiment of the present invention, the current comparison circuit includes:

[0119] An operational amplifier U5;

[0120] The third pin of the operational amplifier U5 is electrically connected to the second current detection circuit through the seventeenth resistor R936;

[0121] The second pin of the operational amplifier U5 is electrically connected to the first current detection circuit through the eighteenth resistor R937 and electrically connected to the first pin of the operational amplifier U5 through the nineteenth resistor R938;

[0122] The third pin of the operational amplifier U5 is electrically connected to the second pin of the operational amplifier U5 through the ninth capacitor C919, and the third pin of the operational amplifier U5 is electrically connected to the fifth pin of the second power conversion module U2 through the nineteenth resistor R939;

[0123] The fourth pin of the operational amplifier U5 is grounded;

[0124] The first pin of the operational amplifier U5 is electrically connected to the fourth pin of the second power conversion module U2 through the twentieth resistor R946 and the twenty-first resistor R940;

[0125] The eighth pin of the operational amplifier U5 is electrically connected to the third power supply VCC-OP and grounded through the tenth capacitor C926.

[0126] In this embodiment, the current comparison circuit further includes: an eleventh capacitor C920, one end of the eleventh capacitor C920 is connected to the output end of the twentieth resistor R946, and the other end is grounded; a twelfth capacitor C921, one end of the twelfth capacitor C921 is connected to the input end of the twenty-first resistor R940, and the other end is grounded.

[0127] An embodiment of the present invention further provides a current-sharing power supply system, including: a first power supply device, a second power supply device, and a power receiving device. The power receiving device is electrically connected to the first power supply device and the second power supply device through a current-sharing circuit, and the current-sharing circuit is the current-sharing circuit described in the above embodiment.

[0128] The current-sharing power supply system described in the present invention can ensure that each power supply module shares the same load current, prevent a certain module from being overloaded, and extend the service life of the power supply module; at the same time, when a certain power supply module fails, the remaining power supply modules can also be used for separate continuous power supply to avoid system shutdown.

[0129] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A current sharing circuit, characterized in that: include: A control circuit electrically connected to the first power supply (Vin1) and the second power supply (Vin2), wherein an output end of the control circuit is electrically connected to a powered device; a first current detection circuit and a second current detection circuit electrically connected to the first power supply (Vin1) and the second power supply (Vin2) respectively through the control circuit; a current comparison circuit electrically connected to the first current detection circuit and the second current detection circuit, wherein an output end of the current comparison circuit is electrically connected to a control circuit; Wherein, the first current detection circuit is used to detect the first output current data of the first power supply (Vin1), and the second current detection circuit is used to detect the second output current data of the second power supply (Vin1); The current comparison circuit is used to compare the first output current data with the second output current data, and output a level signal according to the comparison result; When in use, the control circuit adjusts the output current of the first power supply (Vin1) or the output current of the second power supply (Vin2) according to the level signal output by the current comparison circuit until the two are the same, and outputs a stable current to the powered device.

2. The current balancing circuit according to claim 1, characterized in that: The control circuit comprises: a first power conversion circuit electrically connected to a first power source (Vin1), wherein an output end of the first power conversion circuit is electrically connected to a powered device; a second power conversion circuit electrically connected to a second power source (Vin2), wherein an output end of the second power conversion circuit is electrically connected to a powered device; Wherein, the first current detection circuit is electrically connected to the output end of the first power conversion circuit; the second current detection circuit is electrically connected to the output end of the second power conversion circuit; An input end of the current comparison circuit is electrically connected to the first current detection circuit and the second current detection circuit, and an output end of the current comparison circuit is electrically connected to the second power conversion circuit; Wherein, the first current detection circuit detects first output current data of the first power supply (Vin1) through the first power conversion circuit, and the second current detection circuit detects second output current data of the second power supply (Vin1) through the second power conversion circuit; When in use, the second power conversion circuit adjusts the output current of the output end of the second power conversion circuit according to the level signal output by the current comparison circuit until the output current is the same as the output current of the output end of the first power conversion circuit.

3. The current balancing circuit according to claim 2, characterized in that: The first power conversion circuit comprises: A first power conversion module (U1); Wherein, the first pin of the first power conversion module (U1) is electrically connected to the first power source (Vin1); The second pin of the first power conversion module (U1) is grounded; The fifth pin of the first power conversion module (U1) is electrically connected to the powered device via a first resistor (R953) and a first diode (D119).

4. The current balancing circuit according to claim 2, characterized in that: The second power conversion circuit comprises: A second power conversion module (U2); Wherein, the first pin of the second power conversion module (U2) is electrically connected to the second power supply (Vin1); The second pin of the second power conversion module (U2) is grounded; The fifth pin of the second power conversion module (U2) is electrically connected to the powered device via a second resistor (R954) and a second diode (D120); The fourth pin of the second power conversion module (U2) is electrically connected to the input end of the current comparison circuit.

5. The current balancing circuit according to claim 3, characterized in that: The first current detection circuit comprises: A first detection chip (U3); The seventh pin of the first detection chip (U3) is electrically connected to the input end of the first resistor (R953) through the third resistor (R918); The eighth pin of the first detection chip (U3) is electrically connected to the output end of the first resistor (R953) through the fourth resistor (R919); The eighth pin of the first detection chip (U3) is electrically connected to the seventh pin of the first detection chip (U3) via a first capacitor (C901); The second pin of the first detection chip (U3) is electrically connected to the current comparison circuit through a fifth resistor (R952) and is grounded through a fifth capacitor (C949).

6. The current balancing circuit according to claim 5, characterized in that: The first pin of the first detection chip (U3) is electrically connected to a third power supply (VCC-OP) and is grounded via a second capacitor (C902); The third pin of the first detection chip (U3) is connected to the second pin of the first detection chip (U3) through a sixth resistor (R921), and is grounded through a seventh resistor (R920); The fourth pin of the first detection chip (U3) is grounded; The sixth pin of the first detection chip (U3) is grounded via a fifteenth resistor (R929); The fifth pin of the first detection chip (U3) is grounded through a sixth capacitor (C923) and is electrically connected to a third power source (VCC-OP) through an eighth resistor (R930).

7. The current balancing circuit according to claim 4, characterized in that: The second current detection circuit comprises: A second detection chip (U4); The seventh pin of the second detection chip (U4) is electrically connected to the input end of the second resistor (R954) through a ninth resistor (R922); The eighth pin of the second detection chip (U4) is electrically connected to the output end of the second resistor (R954) through the tenth resistor (R923); The eighth pin of the second detection chip (U4) is electrically connected to the seventh pin of the second detection chip (U4) via a third capacitor (C903); The second pin of the second detection chip (U4) is electrically connected to the current comparison circuit through an eleventh resistor (R951) and is grounded through a seventh capacitor (C948).

8. The current balancing circuit according to claim 7, characterized in that: The first pin of the second detection chip (U4) is electrically connected to a third power supply (VCC-OP) and is grounded via a fourth capacitor (C904); The third pin of the second detection chip (U4) is connected to the second pin of the second detection chip (U4) through a twelfth resistor (R925), and is grounded through a thirteenth resistor (R924); The fourth pin of the second detection chip (U4) is grounded; The sixth pin of the second detection chip (U4) is grounded via a sixteenth resistor (R927); The fifth pin of the second detection chip (U4) is grounded through an eighth capacitor (C922) and is electrically connected to the third power supply (VCC-OP) through a fourteenth resistor (R928).

9. The current balancing circuit according to claim 1, characterized in that: The current comparison circuit comprises: Operational amplifier (U5); The third pin of the operational amplifier (U5) is electrically connected to the second current detection circuit via a seventeenth resistor (R936); The second pin of the operational amplifier (U5) is electrically connected to the first current detection circuit through an eighteenth resistor (R937), and is electrically connected to the first pin of the operational amplifier (U5) through a nineteenth resistor (R938); The third pin of the operational amplifier (U5) is electrically connected to the second pin of the operational amplifier (U5) through a ninth capacitor (C919), and the third pin of the operational amplifier (U5) is electrically connected to the fifth pin of the second power conversion module (U2) through a nineteenth resistor (R939); The fourth pin of the operational amplifier (U5) is grounded; The first pin of the operational amplifier (U5) is electrically connected to the fourth pin of the second power conversion module (U2) through a twentieth resistor (R946) and a twenty-first resistor (R940); The eighth pin of the operational amplifier (U5) is electrically connected to the third power supply (VCC-OP) and is grounded via the tenth capacitor (C926).

10. A current-sharing power supply system, characterized in that: include: A first power supply device, a second power supply device and a powered device, wherein the powered device is electrically connected to the first power supply device and the second power supply device via a current balancing circuit, and the current balancing circuit is the current balancing circuit as claimed in any one of claims 1 to 9.

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