Dual input control circuit and energy storage device

Abstract

The application relates to a dual-input control circuit and an energy storage device. The dual-input control circuit comprises an input source judgment module, which is used for judging whether a dual-supply circuit is connected to the same input source; a current-limiting mode control module, which is used for adopting a first current-limiting mode when the dual-supply circuit is connected to different input sources, and adopting a second current-limiting mode when the dual-supply circuit is connected to the same input source, wherein the current-limiting value corresponding to the first current-limiting mode is greater than the current-limiting value corresponding to the second current-limiting mode. The dual-input control circuit can protect the circuit safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a dual-input control circuit and an energy storage device. BACKGROUND

[0002] With the proposal of the double carbon target, new energy will undoubtedly become the main track. As one of new energy products, the PV (Photovoltaic, PV) charging function is essential for energy storage power supply with large battery capacity. In order to realize high-power PV charging, a dual-PV power supply circuit is generally designed for energy storage power supply with large battery capacity. If the single-PV input voltage range is 12-60Vdc and the maximum input current limit is 20A, the maximum charging power of single-PV is 1200W, and the maximum charging power of two-PV is 2400W.

[0003] When the energy storage power supply has a dual-PV power supply circuit, if the same input source is used to charge the dual-PV circuit, the sampling resistors of PV1 circuit and PV2 circuit will be connected in parallel, which makes the current sampling value half of the actual current, resulting in that the actual input and output current of the PV circuit exceeds the rated current of the fuse, and the PV power supply circuit is damaged. SUMMARY

[0004] Therefore, it is necessary to provide a dual-input control circuit and an energy storage device which can protect the circuit safety.

[0005] In a first aspect, the present application provides a dual-input control circuit applied to a dual-power supply circuit, comprising:

[0006] An input source judgment module is configured to judge whether the dual-power supply circuit is connected to the same input source.

[0007] A current limiting mode control module is configured to adopt a first current limiting mode when the dual-power supply circuit is connected to different input sources, and adopt a second current limiting mode when the dual-power supply circuit is connected to the same input source, wherein the current limiting value corresponding to the first current limiting mode is greater than the current limiting value corresponding to the second current limiting mode.

[0008] In one of the embodiments, the input source judgment module is further configured to generate a first judgment signal based on the input voltage of the dual-power supply circuit, generate a second judgment signal based on the input current of the target power supply circuit, and judge whether the dual-power supply circuit is connected to the same input source based on the first judgment signal and the second judgment signal, wherein the target power supply circuit is one of the dual-power supply circuit.

[0009] In one of the embodiments, the input source judgment module is further configured to generate the second judgment signal based on the input current when the target power supply circuit stops working.

[0010] In one of the embodiments, the input source judging module is configured to determine that the dual power supply circuit is connected to the same input source when an absolute value of a difference between the input voltages of the dual power supply circuit is greater than or equal to a voltage threshold; and determine that the dual power supply circuit is connected to the same input source when the absolute value of the difference between the input voltages of the dual power supply circuit is less than the voltage threshold, and an input current of the target power supply circuit when the target power supply circuit stops working is greater than or equal to a current threshold; and determine that the dual power supply circuit is connected to different input sources when the input current of the target power supply circuit when the target power supply circuit stops working is less than the current threshold.

[0011] In one of the embodiments, the input source judging module comprises:

[0012] a voltage comparison unit, two input terminals of the voltage comparison unit receive the input voltages of the dual power supply circuit respectively, an output terminal of the voltage comparison unit is connected to a first input terminal of the current limiting mode control module, and the voltage comparison unit is configured to compare the input voltages of the dual power supply circuit to obtain a first judgment signal;

[0013] a current comparison unit, one input terminal of the current comparison unit receives a sampling current of a target power supply circuit, and the other input terminal receives a current threshold, and the current comparison unit is configured to compare the input current of the target power supply circuit when the target power supply circuit stops working with the current threshold to obtain a second judgment signal.

[0014] In one of the embodiments, the voltage comparison unit comprises:

[0015] an operational amplifier unit, two input terminals of the operational amplifier unit receive the input voltages of the dual power supply circuit respectively;

[0016] an absolute value output unit, an input terminal of the absolute value output unit is connected to an output terminal of the operational amplifier unit, and the absolute value output unit is configured to obtain an absolute value of a difference between the input voltages of the dual power supply circuit obtained by the operational amplifier unit;

[0017] a comparison unit, one input terminal of the comparison unit is connected to an output terminal of the absolute value output unit, and the other input terminal receives a voltage threshold, and the comparison unit is configured to obtain the first judgment signal based on the absolute value of the difference between the input voltages of the dual power supply circuit and the voltage threshold.

[0018] In one of the embodiments, the circuit further comprises:

[0019] a control signal generation module configured to control the target power supply circuit to stop working for a preset time when the first judgment signal cannot determine that the dual power supply circuit is connected to the same input source, so that the input source judging module generates the second judgment signal based on the input current of the target power supply circuit when the target power supply circuit stops working.

[0020] In one embodiment, the control signal generation module comprises:

[0021] a switch control unit, an input end of the switch control unit receiving the first judgment signal output by the input source judgment module;

[0022] a switch unit, an input end of the switch unit being connected with an output end of the switch control unit;

[0023] In a case where the first judgment signal indicates that the dual-path power supply circuit is connected with different input sources, the switch control unit outputs a first control signal to the switch unit, so that the switch unit controls the dual-path power supply circuit to work; in a case where the first judgment signal cannot judge whether the dual-path power supply circuit is connected with the same input source, the switch control unit outputs a second control signal with a preset time to the switch unit, so that the switch unit controls the target power supply circuit to stop working within the preset time.

[0024] In one embodiment, the switch control unit comprises:

[0025] a first control sub-unit, an input end of the first control sub-unit receiving the first judgment signal output by the input source judgment module, and an output end of the first control sub-unit being connected with an input end of the switch unit;

[0026] a delay sub-unit, an input end of the delay sub-unit receiving the first judgment signal output by the input source judgment module;

[0027] a second control sub-unit, an input end of the second control sub-unit being connected with an output end of the delay sub-unit, and an output end of the second control sub-unit being connected with an input end of the switch unit;

[0028] The delay sub-unit is configured to output a delay signal to the second control sub-unit after a delay of a preset time in a case where the first judgment signal cannot judge whether the dual-path power supply circuit is connected with the same input source; and the second control sub-unit is configured to output a first control signal to the switch unit to make the switch unit control the target power supply circuit to work after receiving the delay signal, wherein the preset time is greater than a switching time length from the first current limiting mode to the second current limiting mode.

[0029] In one embodiment, the circuit further comprises:

[0030] a lock module, an input end of the lock module receiving a working signal of the target power supply circuit, and an output end of the lock module being connected with an input end of the current limiting mode control module;

[0031] The lock module is configured to input a lock signal to the current-limiting mode control module when a working signal of the target power supply circuit is input, and the lock signal is configured to instruct the current-limiting mode control module to adopt a first current-limiting mode when the dual-path power supply circuit is connected to different input sources.

[0032] In one of the embodiments, the current-limiting mode control module comprises:

[0033] a first judging unit, first and second input ends of the first judging unit being connected to two output ends of the input source judging module respectively, and the second input end being further connected to an output end of the lock module;

[0034] an interlocking unit, an input end of the interlocking unit being connected to an output end of the first judging unit;

[0035] a selection unit, an input end of the selection unit being connected to an output end of the interlocking unit;

[0036] The first judging unit is configured to generate a third judging signal judging whether the dual-path power supply circuit is connected to the same input source based on the first judging signal and the second judging signal, the interlocking unit is configured to output a second current-limiting mode selection signal to the selection unit based on the third judging signal, so that the selection unit adopts a second current-limiting mode; and in the case that the output of the first judging unit is converted to a fourth judging signal under the lock signal of the lock module, the interlocking unit outputs a second current-limiting mode selection signal to the selection unit.

[0037] The first judging unit is further configured to generate a fourth judging signal judging whether the dual-path power supply circuit is connected to different input sources based on the first judging signal and the second judging signal, and the interlocking unit is further configured to output a first current-limiting mode selection signal to the selection unit based on the fourth judging signal, so that the selection unit adopts a first current-limiting mode.

[0038] In a second aspect, the application further provides a power storage device comprising the dual-path input control circuit in any one of the above embodiments.

[0039] The double-path input control circuit and the energy storage device, the double-path input control circuit comprises: an input source judgment module, which is used to judge whether the double-path power supply circuit is connected to the same input source; a current limiting mode control module, which is used to adopt a first current limiting mode when the double-path power supply circuit is connected to different input sources, and adopt a second current limiting mode when the double-path power supply circuit is connected to the same input source, the current limiting value corresponding to the first current limiting mode is greater than the current limiting value corresponding to the second current limiting mode, so that the current limiting mode is adjusted based on whether the input source of the double-path power supply circuit is the same input source, so that the maximum input current of the double-path power supply circuit under any working condition is less than the corresponding current limiting mode value, and the circuit safety is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0041] Figure 1 A schematic diagram of a double-path power supply circuit in an embodiment;

[0042] Figure 2 A module diagram of a double-path input control circuit in an embodiment;

[0043] Figure 3 A circuit diagram of a double-path input control circuit in an embodiment;

[0044] Figure 4 A module diagram of a double-path input control circuit in another embodiment;

[0045] Figure 5 A circuit diagram of a double-path input control circuit in another embodiment.

[0046] BRIEF DESCRIPTION OF DRAWINGS

[0047] 100 input source judging module, 200 current limiting mode control module, 300 control signal generating module, 400 locking module, 500 constant current driving module, 110 voltage comparison unit, 120 current comparison unit, 111 operational amplifier unit, 112 absolute value output unit, 113 comparison unit, 121 first comparison subunit, 122 second comparison subunit, 123 logic unit, 310 switch control unit, 320 switch unit, 311 first control subunit, 312 delay subunit, 313 second control subunit, 510 control signal generating unit, 520 constant current switch unit, 530 current sampling time control unit, 210 first judging unit, 220 interlocking unit, 230 selection unit. DETAILED DESCRIPTION

[0048] For the purpose of promoting the understanding of the present application, the present application will be more fully described by reference to the following drawings. The following drawings represent embodiments of the present application. However, the present application can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It will be apparent that the scope of the present application is not limited to the embodiments set forth herein.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0050] It should be understood that the terms "first", "second" and so on used in the present application can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element. For example, without departing from the scope of the present application, the first resistor can be referred to as the second resistor, and similarly, the second resistor can be referred to as the first resistor. The first resistor and the second resistor are both resistors, but they are not the same resistor.

[0051] It should be understood that "connection" in the following embodiments means that the circuits, modules, units and the like connected to each other have the transmission of electrical signals or data.

[0052] It should be understood that "at least one" means one or more, and "a plurality of" means two or more. "At least part of an element" means part or all of the element.

[0053] As used herein, the singular forms "a," "an," and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include," "comprising," "having," and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Furthermore, the term "and / or" as used in this specification includes any and all combinations of the relevant listed items.

[0054] Figure 1 FIG. 1 is a schematic diagram of a dual-path power supply circuit in one embodiment, Figure 1 As shown, in this embodiment, the output terminals of the dual power supply circuit are connected in parallel, both connected to the positive terminal BAT+ and the negative terminal GND_BAT of the battery pack. Assume that the battery pack voltage range is 45-57V; the resistance values ​​of the current sampling resistors R1 and R2 in the dual power supply circuit are 5mΩ. After sampling, the current is amplified by 20 times through the operational amplifier. That is, when the current flows through 20A, the sampled current value after the operational amplifier is amplified is 2V (20A * 5mΩ * 20); the rated current of fuses F1, F2, F3, and F4 is 30A; and the conversion efficiency of the dual power supply circuit is 95%.

[0055] A dual-power supply circuit uses two input sources (DC source, PV solar panel, etc.) to power each circuit. For example, when charging two PV-powered circuits, PV1 and PV2, if both have an input voltage of 60V and an input current of 20A, the charging power of PV1 and PV2 is 1200W. With a 95% conversion efficiency, the power entering the battery pack is 1140W. If the battery pack voltage is 45V, the current entering the battery pack is 25.33A (1140W / 45V). The rated currents of fuses F1, F2, F3, and F4 are all greater than the actual application current, meeting design requirements. The sampling values ​​of current sampling resistors R1 and R2 are both 2V.

[0056] When the dual-channel power supply circuit is charged by the same input source, the input terminals of the first power supply circuit PV1 and the second power supply circuit PV2 are in parallel, and the current sampling resistors R1 and R2 are also in parallel, so the current sampling resistor value of the first power supply circuit PV1 and the second power supply circuit PV2 becomes 2.5 mΩ. If the input voltage is 60 V and the input current is 20 A, the sampling values of the current sampling resistors R1 and R2 are both 1 V (20 A*2.5 mΩ*20), and the sampled single-channel charging power is only 600 W, while the actual charging power is 1200 W. When the first power supply circuit PV1 and the second power supply circuit PV2 identify that the current sampling value is far from the parameter value 2 V corresponding to the first current limiting mode, the input current will continue to be released to 2 V, so the input current will reach 40 A, and the sampled single-channel charging power is 1200 W, while the actual charging power is 2400 W. If the battery pack voltage is 45 V, the current entering the battery pack is 53.33 A (2400 W / 45 V). At this time, both the input current and the output current (the current entering the battery pack) far exceed the rated current of the fuses F1, F2, F3 and F4, thereby causing the fuses to be blown and the first power supply circuit PV1 and the second power supply circuit PV2 to be damaged.

[0057] In summary, when the energy storage power supply has a dual-channel power supply circuit, if the same input source is used to charge the dual-channel power supply circuit, the sampling resistors of the first power supply circuit PV1 and the second power supply circuit PV2 will be connected in parallel, which makes the current sampling value half of the actual current, resulting in that the actual input and output currents of the dual-channel power supply circuit exceed the rated current of the fuses, and the dual-channel power supply circuit is damaged.

[0058] To solve the above technical problems, the application provides a dual-channel input control circuit, which combines Figure 2 As shown in the figure, the dual-channel input control circuit includes an input source judgment module 100 and a current limiting mode control module 200.

[0059] The input source judgment module 100 can judge whether the dual-channel power supply circuit is connected to the same input source based on the input voltage or input current of the dual-channel power supply circuit. In other embodiments, the input source judgment module 100 can also judge whether the dual-channel power supply circuit is connected to the same input source in combination with the input voltage and the input current, which is not specifically limited here.

[0060] The dual-channel power supply circuit can be a dual-channel photovoltaic power supply circuit, and in other embodiments, it can also be other power supply circuits, which are not specifically limited here.

[0061] In the case that the input source judgment module 100 determines that the dual power supply circuit is connected to different input sources, the current limiting mode control module 200 controls the working mode of the dual power supply circuit to adopt the first current limiting mode; in the case that the input source judgment module 100 determines that the dual power supply circuit is connected to the same input source, the current limiting mode control module 200 controls the working mode of the dual power supply circuit to adopt the second current limiting mode, and the electric parameter value corresponding to the first current limiting mode is greater than the electric parameter value corresponding to the second current limiting mode, in combination with the dual power supply circuit in the foregoing, wherein the electric parameter value corresponding to the second current limiting mode is half of the electric parameter value corresponding to the first current limiting mode, for example, the electric parameter value corresponding to the first current limiting mode is 2V, and the electric parameter value corresponding to the second current limiting mode is 1V. The above values can be adjusted according to the design requirements of the circuit and different application scenarios.

[0062] The input source can include a DC source, a PV solar panel, and the like, which are not specifically limited here.

[0063] The dual-input control circuit includes: an input source judgment module 100, configured to judge whether the dual power supply circuit is connected to the same input source; and a current limiting mode control module 200, configured to adopt the first current limiting mode in the case that the dual power supply circuit is connected to different input sources, and adopt the second current limiting mode in the case that the dual power supply circuit is connected to the same input source, wherein the current limiting value corresponding to the first current limiting mode is greater than the current limiting value corresponding to the second current limiting mode. In this way, the current limiting mode is adjusted based on whether the input source of the dual power supply circuit is the same input source, so that the maximum input current of the dual power supply circuit under any working condition is less than the electric parameter value under the corresponding current limiting mode, thereby ensuring the safety of the circuit.

[0064] In some optional embodiments, the input source judgment module 100 is further configured to generate a first judgment signal based on the input voltage of the dual power supply circuit, generate a second judgment signal based on the input current of the target power supply circuit, and judge whether the dual power supply circuit is connected to the same input source based on the first judgment signal and the second judgment signal, wherein the target power supply circuit is one of the dual power supply circuits.

[0065] The first judgment signal is generated by the input source judgment module 100 based on the input voltage of the dual power supply circuit, for example, whether the dual power supply circuit is connected to the same input source is determined by judging whether the input voltages of the dual power supply circuit are the same or the difference between the input voltages is within the allowed error range, if the absolute value of the difference between the input voltages is not within the allowed error range, it indicates that the dual power supply circuit is connected to different input sources, otherwise, the judgment is continued by the input current.

[0066] The input voltage is obtained by sampling the voltage of the dual-path power supply circuit when there is an input source in at least one path of the dual-path power supply circuit. For the convenience of understanding, the dual-path power supply circuit includes a first power supply circuit PV1 and a second power supply circuit PV2. When there is an input source in the first power supply circuit PV1 and / or the second power supply circuit PV2, the input voltage of the first power supply circuit PV1 and the second power supply circuit PV2 can be sampled to obtain the input voltage. If the input voltages of the first power supply circuit PV1 and the second power supply circuit PV2 are different, it indicates that the input sources of the first power supply circuit PV1 and the second power supply circuit PV2 are different input sources. Therefore, the first determination signal can be obtained based on the input voltages of the first power supply circuit PV1 and the second power supply circuit PV2 to detect whether the first power supply circuit PV1 and the second power supply circuit PV2 are connected to the same input source. Whether the input voltages of the first power supply circuit PV1 and the second power supply circuit PV2 are the same can be determined by comparing the absolute value of the difference between the input voltages of the dual-path power supply circuit with a voltage threshold value. For example, when the absolute value of the difference between the input voltages of the dual-path power supply circuit is greater than or equal to the voltage threshold value, it is determined that the first power supply circuit PV1 and the second power supply circuit PV2 are connected to different input sources. When the absolute value of the difference between the input voltages of the dual-path power supply circuit is less than the voltage threshold value, it cannot be determined whether the first power supply circuit PV1 and the second power supply circuit PV2 are connected to the same input source. This is because there is an error in the detection of the input voltage. Therefore, considering the error, the second determination signal also needs to be generated by the input current of the target power supply circuit. The input current of the target power supply circuit can include the input current of the first power supply circuit PV1 or the second power supply circuit PV2.

[0067] In some optional embodiments, the input source judgment module 100 is combined with the current limiting mode control module 200. Figure 3 As shown in FIG. 1, Figure 3 FIG. 1 is a circuit diagram of the dual-path input control circuit in an embodiment. The input source judgment module 100 includes a voltage comparison unit 110 and a current comparison unit 120. The two input terminals of the voltage comparison unit 110 receive the input voltages of the dual-path power supply circuit, respectively. The output terminal of the voltage comparison unit 110 is connected to the first input terminal of the current limiting mode control module 200, which is used to compare the input voltages of the dual-path power supply circuit to obtain the first determination signal. One input terminal of the current comparison unit 120 receives the sampling current of the target power supply circuit, and the other input terminal receives the current threshold value, which is used to compare the input current of the target power supply circuit with the current threshold value to obtain the second determination signal.

[0068] The voltage comparison unit 110 is used to compare the input voltages of the dual power supply circuit to determine the relationship between the absolute value of the difference of the input voltages of the dual power supply circuit and the voltage threshold value. When the absolute value of the difference of the input voltages of the dual power supply circuit is greater than or equal to the voltage threshold value, it indicates that the dual power supply circuit is connected to different input sources. When the absolute value of the difference of the input voltages of the dual power supply circuit is less than the voltage threshold value, it cannot be determined whether the dual power supply circuit is connected to the same input source, so the current comparison unit 120 is needed to compare the input currents. The current comparison unit 120 mainly compares the input current of the target power supply circuit with the current threshold value. When the input current of the target power supply circuit when it stops working is less than the current threshold value, it indicates that the dual power supply circuit is connected to different input sources. Otherwise, it indicates that the dual power supply circuit is connected to the same input source.

[0069] The voltage comparison unit 110 includes an operational amplifier unit 111, an absolute value output unit 112, and a comparison unit 113. Figure 3 The voltage comparison unit 110 includes an operational amplifier unit 111, an absolute value output unit 112, and a comparison unit 113.

[0070] As shown in Figure 3 The operational amplifier unit 111 includes an operational amplifier U3A and its peripheral circuit, the comparison unit 113 includes a comparator U2 and its peripheral circuit, and the absolute value output unit 112 includes operational amplifiers U1A and U1B and their peripheral circuits.

[0071] In the operational amplifier unit 111, the non-inverting input terminal of the operational amplifier U3A is connected to the second terminal of the resistor R9, the first terminal of the resistor R9 receives the input voltage of the first power supply circuit PV1, the inverting input terminal of the operational amplifier U3A is connected to the second terminal of the resistor R11, the first terminal of the resistor R11 receives the input voltage of the second power supply circuit PV2, the second terminal of the resistor R9 is also connected to the second terminal of the resistor R7, the second terminal of the resistor R7 is connected to the ground GND of the dual input control circuit, the second terminal of the resistor R11 is also connected to the first terminal of the resistor R16, and the second terminal of the resistor R16 is connected to the output terminal of the operational amplifier U3A.

[0072] In the absolute value output unit 112, the first end of the resistor R10 is connected with the output end of the operational amplifier unit 111 and the first end of the resistor R4, the second end of the resistor R10 is connected with the non-inverting input end of the operational amplifier U1A, the inverting input end of the operational amplifier U1A is connected with the first end of the resistor R18, the second end of the resistor R18 is connected with the output end of the operational amplifier U1A and the first end of the resistor R5, the second end of the resistor R5 is connected with the non-inverting input end of the operational amplifier U1B, the second end of the resistor R4 and the first end of the resistor R3 are connected with the inverting input end of the operational amplifier U1B, the second end of the resistor R3 is connected with the output end of the operational amplifier U1B, which is the output end of the absolute value output unit 112.

[0073] In the comparison unit 113, the non-inverting input end of the comparator U2 inputs the voltage threshold value, the inverting input end is connected with the output end of the absolute value output unit 112, and the output end of the comparator U2 outputs the first judgment signal.

[0074] In the case that the difference between the input voltages of the first power supply circuit PV1 and the second power supply circuit PV2 has positive and negative values after being output by the operational amplifier U3A, the values input into the inverting input end of the pin 3 of the comparator U2 after passing through the absolute value output circuit are all positive values.

[0075] In some optional embodiments, in the case that the voltage threshold value is the difference between the input voltages of the dual power supply circuit and the target value, the value obtained after passing through the absolute value output unit 112, wherein the value range of the target value is determined based on the line loss and the sampling deviation.

[0076] In the embodiment, the value of the voltage threshold value Vref is defined as the value Vsamp output by the operational amplifier U3A and the absolute value output circuit when the difference between the input voltages of the first power supply circuit PV1 and the second power supply circuit PV2 is the target value, wherein the value range of the target value is determined based on the line loss and the sampling deviation, which can be 1V-3V. The line loss is due to the fact that the input of the input source needs to be connected to the corresponding first power supply circuit PV1 and second power supply circuit PV2 through a wire, so the input voltage may have a line loss, and the line losses of the first power supply circuit PV1 and the second power supply circuit PV2 may not be the same. In addition, the input voltage is obtained by sampling, which may have a sampling deviation. Therefore, as long as the difference between the input voltages of the first power supply circuit PV1 and the second power supply circuit PV2 is greater than or equal to the target value, it is considered that the first power supply circuit PV1 and the second power supply circuit PV2 are connected to different input sources.

[0077] In addition, the voltage threshold value is taken at the input voltage of the first power supply circuit PV1 or the second power supply circuit PV2 to ensure that the second power supply circuit PV2 enable pin PV2_EN controls only when the first power supply circuit PV1 or the second power supply circuit PV2 is connected to the input source.

[0078] wherein the input current can be the input current of any one of the dual power supply circuits, and the second judgment signal is generated based on the input current of the any one of the dual power supply circuits, which is called target power supply circuit for convenience of description. The input source judgment module 100 judges whether the dual power supply circuits are connected to the same input source by collecting the input current of the target power supply circuit, for example, comparing the input current of the target power supply circuit with a threshold value.

[0079] Finally, the input source judgment module 100 judges whether the dual power supply circuits are connected to the same input source based on the first judgment signal obtained based on the input voltage and the second judgment signal obtained based on the input current.

[0080] In some optional embodiments, the input source judgment module 100 is further configured to generate the second judgment signal based on the input current when the target power supply circuit stops working. In other embodiments, the input source judgment module 100 is further configured to generate the second judgment signal based on the input current when the sampling terminal of the target power supply circuit is supplied by a constant current source.

[0081] In some optional embodiments, the input source judgment module 100 is configured to determine that the dual power supply circuits are connected to different input sources when the absolute value of the difference between the input voltages of the dual power supply circuits is greater than or equal to a voltage threshold value; and determine that the dual power supply circuits are connected to the same input source when the absolute value of the difference between the input voltages of the dual power supply circuits is less than the voltage threshold value, and the input current when the target circuit stops working is greater than or equal to a current threshold value, and determine that the dual power supply circuits are connected to different input sources when the input current when the target circuit stops working is less than the current threshold value. In some optional embodiments, the input source judgment module 100 is configured to determine that the dual power supply circuits are connected to different input sources when the absolute value of the difference between the input voltages of the dual power supply circuits is greater than or equal to a voltage threshold value; and determine that the dual power supply circuits are connected to the same input source when the absolute value of the difference between the input voltages of the dual power supply circuits is less than the voltage threshold value, and the input current when the sampling terminal of the target circuit is supplied by a constant current source is less than a first current threshold value and greater than a second current threshold value, and determine that the dual power supply circuits are connected to different input sources when the input current when the sampling terminal of the target circuit is supplied by a constant current source is greater than the first current threshold value and greater than the second current threshold value.

[0082] In some optional embodiments, the target power supply circuit can be the one controlled to stop working based on the first judgment signal, that is, in the case where the first judgment signal cannot determine whether the dual power supply circuits are connected to the same input source, the working of one of the power supply circuits is stopped first to protect the circuit first. After the connection of the input sources of the dual power supply circuits is determined, the target power supply circuit is controlled to work, so the target power supply circuit only stops working for this period of time of the input source judgment.

[0083] In the case that the input source judgment module 100 cannot determine whether the first power supply circuit PV1 or the second power supply circuit PV2 is connected to the same input source based on the input voltage of the dual power supply circuit, the target power supply circuit (hereinafter, the target power supply circuit is taken as the second power supply circuit PV2 as an example) is first controlled to stop working, and then the input current of the target power supply circuit when it stops working is collected. The input current of the target power supply circuit exists because if the input sources of the first power supply circuit PV1 and the second power supply circuit PV2 are the same input source, the sampling resistors of the first power supply circuit PV1 and the second power supply circuit PV2 are in parallel, so that when the first power supply circuit PV1 normally works, a part of current also flows into the sampling resistor of the second power supply circuit PV2, that is, the input current here. However, since the second power supply circuit PV2 does not formally work, the value of the input current is small, and the value of the input current will become large after the second power supply circuit PV2 starts to work. If the input sources of the first power supply circuit PV1 and the second power supply circuit PV2 are not the same input source, the sampling resistors of the first power supply circuit PV1 and the second power supply circuit PV2 are not in parallel, so that no current flows into the sampling resistor of the second power supply circuit PV2. Therefore, when the second power supply circuit PV2 stops working, whether the input sources of the first power supply circuit PV1 and the second power supply circuit PV2 are the same input source can be determined by detecting whether there is an input current in the second power supply circuit PV2, so that the second judgment signal is generated based on the input current when the target power supply circuit stops working. Considering the detection error, when the input current when the target power supply circuit stops working is less than the current threshold, it is considered that no current flows into the sampling resistor of the second power supply circuit PV2, and it is judged that the dual power supply circuit is connected to different input sources. When the input current when the target power supply circuit stops working is greater than or equal to the current threshold, it is considered that there is current flowing into the sampling resistor of the second power supply circuit PV2, and it is judged that the dual power supply circuit is connected to the same input source.

[0084] Figure 3 As shown in the figure, the current comparison unit 120 includes a comparator U5 and its peripheral circuit, wherein the positive input end of the comparator U5 receives the input current, the reverse input end receives the current threshold, and the output end is connected to the second end of the resistor R19, and the first end of the resistor R19 is connected to the power supply VCC.

[0085] In some optional embodiments, the current threshold is related to the target charging current, the resistance value of the sampling resistor, and the amplification multiple of the sampling current.

[0086] ​Wherein, since the input current is determined when the target power supply circuit stops working, and only when the first power supply circuit PV1 and the second power supply circuit PV2 are connected to the same input source, the target power supply circuit will have input current when it stops working, therefore, in order to ensure accuracy and avoid errors, the target charging current cannot be too small, and since the target charging current is gradually increasing, it needs a certain collection time, therefore, in order to avoid long-time collection, the target charging current cannot be too small, therefore, the target charging current can be set to 1A-3A, for example, 2A, and in other embodiments, it can be other ranges. Optionally, the current threshold Iref can be defined as 0.1V, if the dual-channel power supply circuit is connected to the same source, i.e. the sampling resistor R1 of the first power supply circuit PV1 and the sampling resistor R2 of the second power supply circuit PV2 are connected in parallel, then the current sampling value of the second power supply circuit PV2 is 0.1V, and the target charging current corresponding to 2A (2A*2.5mΩ*20).

[0087] In other embodiments, the target power supply circuit can also be a single-channel power supply circuit powered by a constant current source at the sampling end, i.e. in the case where the first determination signal cannot determine whether the dual-channel power supply circuit is connected to the same input source, the constant current source is first connected to the target power supply circuit to supply power, which fixes the current of the sampling resistor of the target power supply circuit, and the connection of the input source of the dual-channel power supply circuit is determined by detecting the input current corresponding to the sampling resistor, and after determining the connection of the input source of the dual-channel power supply circuit, the target power supply circuit is controlled to work normally, i.e. the connection between the constant current source and the sampling end of the target power supply circuit is disconnected, therefore, the target power supply circuit is powered by the constant current source only during the input source determination period.

[0088] In a case that the input source judgment module 100 cannot determine whether the first power supply circuit PV1 or the second power supply circuit PV2 is connected to the same input source based on the input voltage of the dual-path power supply circuit, the constant current source is controlled to supply power to the sampling end of the target power supply circuit within a target time, and then the input current of the target power supply circuit when the constant current source supplies power is collected. In a case that the input sources of the first power supply circuit PV1 and the second power supply circuit PV2 are the same input source, the sampling resistors of the first power supply circuit PV1 and the second power supply circuit PV2 are in parallel, and thus in a case that the constant current source determines the input, the current sampling values are different due to different resistance values of the sampling resistors. Therefore, whether the first power supply circuit PV1 and the second power supply circuit PV2 are connected to the same input source can be determined based on the different current sampling values. In a case that the first power supply circuit PV1 and the second power supply circuit PV2 are connected to different input sources, a first current sampling value can be determined, in a case that the first power supply circuit PV1 and the second power supply circuit PV2 are connected to the same input source, a second current sampling value can be determined, and based on the first current sampling value and the second current sampling value, a corresponding first current threshold value and a second current threshold value can be determined. Thus, in a case that the input current of the sampling end of the target circuit when the constant current source supplies power is less than the first current threshold value and greater than the second current threshold value, it is determined that the dual-path power supply circuit is connected to the same input source, and in a case that the input current of the sampling end of the target circuit when the constant current source supplies power is greater than the first current threshold value and greater than the second current threshold value, it is determined that the dual-path power supply circuit is connected to different input sources.

[0089] In combination Figure 4 as shown, Figure 4 is a module diagram of the dual-path input control circuit in another embodiment. In this embodiment, the current comparison unit 120 includes a first comparison subunit 121, a second comparison subunit 122, and a logic unit 123. An input end of the first comparison subunit 121 receives the first current threshold value, and another input end of the first comparison subunit 121 receives the input current of the target power supply circuit. An input end of the second comparison subunit 122 receives the second current threshold value, and another input end of the second comparison subunit 122 receives the input current of the target power supply circuit. An input end of the logic unit 123 is connected to the output end of the first comparison subunit 121, and another input end of the logic unit 123 is connected to the output end of the second comparison subunit 122, for generating a second judgment signal based on the comparison result of the first comparison subunit 121 and the comparison result of the second comparison subunit 122.

[0090] The current comparison unit 120 mainly compares the input current of the target power supply circuit supplied by the constant current source with the first current threshold value and the second current threshold value, to determine whether the dual-path power supply circuit is connected to the same input source.

[0091] The current comparison unit 120 comprises a first comparison subunit 121, a second comparison subunit 122 and a logic unit 123, which are combined Figure 5 The first comparison subunit 121 comprises a comparator U6A and its peripheral circuit, the second comparison subunit 122 comprises a comparator U6B and its peripheral circuit, and the logic unit 123 comprises an AND gate U7 and its peripheral circuit. In the first comparison subunit 121, the non-inverting input terminal of the comparator U6A receives a first current threshold, the inverting input terminal receives an input current of the target power supply circuit powered by the constant current source, and the output terminal is connected to the second terminal of a resistor R17, and the first terminal of the resistor R17 is connected to a power supply VCC. In the second comparison subunit 122, the non-inverting input terminal of the comparator U6B receives the input current of the target power supply circuit powered by the constant current source, the inverting input terminal receives a second current threshold, and the output terminal is connected to the second terminal of a resistor R36, and the first terminal of the resistor R36 is connected to the power supply VCC. In the logic unit 123, the first terminal of the AND gate U7 is connected to the output terminal of the comparator U6A, the second terminal of the AND gate U7 is connected to the output terminal of the comparator U6B, and the output terminal of the AND gate U7 serves as the output terminal of the current comparison unit 120.

[0092] In one of the optional embodiments, the first current threshold is smaller than the first current sampling value and larger than the second current sampling value, and the second current threshold is smaller than the first current sampling value and larger than the second current sampling value; the first current sampling value is a current sampling value when the dual-path power supply circuit accesses different input sources, and the second current sampling value is a current sampling value when the dual-path power supply circuit accesses the same input source.

[0093] In order to facilitate understanding, the size of the constant current source can be determined based on the maximum power consumption of the sampling resistor. The size of the constant current source is determined under the condition of ensuring that the maximum power consumption of the sampling resistor is less than the maximum power consumption of the sampling resistor. For example, the output current of the constant current source can be defined as 0.5A. In other embodiments, the size of the output current of the constant current source is also related to the amplification factor. Based on the size of the constant current source and the amplification factor and the resistance value of the sampling resistor, the current sampling value is appropriate to avoid errors caused by too small current sampling value. The current sampling value of the first power supply circuit PV1 is amplified, i.e. when the dual-path power supply circuit accesses different input sources, the current sampling value of the first power supply circuit PV1 is the first current sampling value, which can be 1V (5mΩ*0.5A*400), wherein 400 is the amplification factor, which can be other values in other embodiments. When the dual-path power supply circuit accesses the same input source, the current sampling value of the first power supply circuit PV1 is the second current sampling value, which can be 0.5V (2.5mΩ*0.5A*400).

[0094] The first current threshold is less than the first current sampling value and greater than the second current sampling value, and the second current threshold is less than the first current sampling value and less than the second current sampling value. Taking the first current sampling value as 1V and the second current sampling value as 0.5V as an example, the first current threshold can be 0.9V, and the second current threshold can be 0.4V. In other embodiments, the first current threshold and the second current threshold can also be other values, as long as the input current of the target power supply circuit powered by the constant current source is ensured, and different second judgment signals are output by the current comparison unit 120 in the case of the dual-path power supply circuit accessing the same input source or different input sources.

[0095] In the above embodiment, the input voltage and the input current are used to determine the input source of the dual-path power supply circuit.

[0096] In one of the optional embodiments, the dual-path input control circuit further includes a control signal generation module 300, configured to control the target circuit to stop working for a preset time in the case that the first judgment signal cannot determine whether the dual-path power supply circuit is connected to the same input source, so that the input source determination module 100 generates a second judgment signal based on the input current when the target circuit stops working.

[0097] The control signal generated by the control signal generation module 300 is mainly used to control the target power supply circuit to stop working, continue working or restart working.

[0098] In the case that the first judgment signal of the voltage comparison unit 110 determines that the dual-path power supply circuit is connected to different input sources, the dual-path power supply circuit can work simultaneously, and therefore the control signal generation module 300 controls the dual-path power supply circuit to work simultaneously.

[0099] In the case that the first judgment signal of the voltage comparison unit 110 indicates that it cannot be determined whether the dual-path power supply circuit is connected to the same input source, in order to protect the circuit, the control signal generation module 300 controls the target power supply circuit to stop working for a preset time.

[0100] In one of the optional embodiments, the control signal generation module 300 includes a switch control unit 310 and a switch unit 320, wherein the input end of the switch control unit 310 receives the first judgment signal output by the input source determination module 100, and the input end of the switch unit 320 is connected to the output end of the switch control unit 310.

[0101] In a case where the first judgment signal indicates that the dual power supply circuit is connected to different input sources, the switch control unit 310 outputs a first control signal to the switch unit 320, so that the switch unit 320 controls the dual power supply circuit to work; in a case where the first judgment signal cannot judge whether the dual power supply circuit is connected to the same input source, the switch control unit 310 outputs a second control signal to the switch unit 320, so that the switch unit 320 controls the target power supply circuit to stop working within a preset time.

[0102] The switch control unit 310 is configured to generate a control signal of the switch unit 320 based on the first judgment signal output by the voltage comparison module, so that the switch unit 320 outputs or does not output an enable signal for stopping the target power supply circuit from working.

[0103] In a case where the first judgment signal indicates that the dual power supply circuit is connected to different input sources, the switch control unit 310 outputs a first control signal, and the first control signal causes the switch unit 320 to be non-conductive, so that the switch unit 320 does not output the enable signal for stopping the target power supply circuit from working.

[0104] In a case where the first judgment signal cannot judge whether the dual power supply circuit is connected to the same input source, the switch control unit 310 outputs a second control signal, and the second control signal causes the switch unit 320 to be conductive, so that the switch unit 320 controls the target power supply circuit to stop working within a preset time.

[0105] In some optional embodiments, the switch control unit 310 includes a first control subunit 311, a delay subunit 312, and a second control subunit 313. The first control subunit 311 receives the judgment signal output by the input source judgment module 100 at an input end and is connected to a first input end of the switch unit 320 at an output end. The delay subunit 312 receives the first judgment signal output by the input source judgment module 100 at an input end. The second control subunit 313 is connected to the output end of the delay subunit 312 at an input end and is connected to the input end of the switch unit 320 at an output end.

[0106] The delay subunit 312 is configured to output a delay signal to the second control subunit 313 after a preset time in a case where the first judgment signal cannot judge whether the dual power supply circuit is connected to the same input source. The second control subunit 313 is configured to output the first control signal to the switch unit 320 after receiving the delay signal, so that the switch unit 320 controls the target power supply circuit to work. The preset time is greater than a switching duration from the first current limiting mode to the second current limiting mode.

[0107] The first control subunit 311 includes a diode D1, an anode of the diode D1 is connected with an output end of the voltage comparison unit 110, a cathode of the diode D1 is connected with an input end of the switch unit 320, the second control subunit 313 includes a triode Q10, a collector of the triode Q10 is connected with a reverse segment of the diode D1, a base is connected with an output end of the delay subunit 312, and an emitter is grounded GND.

[0108] The delay subunit 312 re-outputs the delay signal to the second control subunit 313 after delaying for a preset time length in a case that the first judgment signal cannot judge whether the dual power supply circuit is the same input source; and the second control subunit 313 is configured to output the first control signal to the switch unit 320 to make the switch unit 320 control the stopped working power supply circuit to work again after receiving the delay signal.

[0109] The delay subunit 312 includes that one end of a resistor R12 is connected with the output end of the voltage comparison unit 110, a second end of the resistor R12 is connected with a first end of a capacitor C5 and a second end of a voltage stabilizing tube DZ1, a first end of the voltage stabilizing tube DZ1 is connected with a first end of a resistor R15, a second end of the resistor R15 is connected with a first end of a resistor R17 and a base of the triode Q10, a second end of the capacitor C5 and a second end of the resistor R17 are grounded GND.

[0110] The switch unit 320 includes that a first end of a resistor R13 is connected with the output end of the switch control unit 310, a second end of the resistor R13, a first end of a resistor R14 and a gate of a switch tube Q9 are connected, a drain of the switch tube Q9 is connected with a second end of a resistor R8, a second end of the resistor R14 and a source of the switch tube Q9 are grounded GND, and the second end of the resistor R8 outputs or does not output an enable signal of stopping working of the power supply circuit.

[0111] The VCC voltage charges the capacitor C5 through the resistor R6 and the resistor R12, when the voltage of the capacitor C5 is greater than a voltage stabilizing value of the voltage stabilizing tube DZ1, the voltage stabilizing tube DZ1 is broken down, when the voltage of the 1 pin of the voltage stabilizing tube DZ1 after being broken down is greater than Vbe(th) of the triode Q10, the triode Q10 is turned on, the gate of the MOS tube Q9 is pulled low, the switch tube Q9 is cut off, the enable pin PV2_EN of the second power supply circuit PV2 is no longer pulled low, and the second power supply circuit PV2 starts to work. It should be noted that the time of charging the capacitor C5 to the voltage to break down the voltage stabilizing tube DZ1 and make the triode Q10 turn on needs to be greater than the time of completing the switching of the current limiting mode.

[0112] In some optional embodiments, the dual-input control circuit further comprises a constant current source driving module, the constant current source driving module 500 is connected with the constant current source and the input source judging module 100, and is used for controlling the constant current source to supply power to the sampling end of the target power supply circuit within the target time in the case that the first judging signal cannot determine whether the dual power supply circuit is connected with the same input source.

[0113] The constant current source driving module is used for controlling the constant current source to supply power to the sampling end of the target power supply circuit within the target time, so as to determine the input source through the input current of the target power supply circuit.

[0114] The constant current driving module 500 is used for fixing the input current of the target power supply circuit in the case that the first judging signal cannot determine whether the input source of the dual power supply circuit is the same input source, that is, supplying power to the target power supply circuit by the constant current source, so that the current of the target photovoltaic power supply circuit is the current of the constant current source. In this way, if the first photovoltaic power supply circuit PV1 or the second photovoltaic power supply circuit PV2 is connected with the same input source, the resistance value of the sampling resistor of one photovoltaic power supply circuit is half of the original resistance value, and if the first photovoltaic power supply circuit PV1 or the second photovoltaic power supply circuit PV2 is connected with different input sources, the resistance value of the sampling resistor of one photovoltaic power supply circuit is the original resistance value. Therefore, the current sampling value obtained by sampling the input current of the target power supply circuit can be used to determine whether the input source of the first photovoltaic power supply circuit PV1 or the second photovoltaic power supply circuit PV2 is the same input source.

[0115] In addition, in order to avoid affecting the normal work of the dual power supply circuit, the connection between the constant current source and the target power supply circuit is disconnected after the second current limiting mode is adopted in the working mode of the dual power supply circuit, so that the target power supply circuit works normally, that is, no matter what mode is adopted, the constant current source only works within the target time, and after the input source of the dual power supply circuit is determined, the connection between the constant current source and the target power supply circuit is disconnected.

[0116] In some optional embodiments, the constant current driver module 500 includes: a control signal generating unit 510 and a constant current switch unit 520. The input end of the control signal generating unit 510 is connected to the first output end of the input source judgment module 100; the constant current switch unit 520 is connected in series with the constant current source and then connected in parallel between the input ground of the target power supply circuit and the input ground of the battery pack. The control signal generating unit 510 is configured to output a first control signal if the first judgment signal cannot determine whether the dual power supply circuits are connected to the same input source, and the constant current switch unit 520 is configured to control the constant current source to supply power to the sampling end of the target power supply circuit within a target time based on the first control signal; and to output a second control signal if the first judgment signal determines that the dual power supply circuits are connected to different input sources, and the constant current switch unit 520 is configured to control the constant current source to disconnect from the sampling end of the target power supply circuit based on the second control signal.

[0117] Among them, combined Figure 5 As shown, the control signal generating unit 510 includes a transistor Q16. The emitter of the transistor Q16 is connected to the first output terminal of the input source determination module 100 and the first end of the resistor R33. The second end of the resistor R33 is connected to the base of the transistor Q16. The collector of the transistor Q16 is connected to the control terminal of the constant current switch unit 520. The constant current switch unit 520 includes a switch Q17. The gate of the switch Q17 is connected to the second end of the resistor R34 and the first end of the resistor R35. The first end of the resistor R34 serves as the control terminal of the constant current switch unit 520. The second end of the resistor R35 and the source of the switch Q17 are connected to the input ground of the battery pack. The drain of the switch Q17 is connected to the second end of the constant current source. The first end of the constant current source is connected to the input ground of the target power supply circuit.

[0118] In which, when the first judgment signal indicates that the input sources of the dual power supply circuit are connected to different input sources, the control signal generating unit 510 outputs a second control signal, and the constant current switch unit 520 controls the constant current source to disconnect from the sampling end of the target power supply circuit based on the second control signal under the second control signal.

[0119] When the first judgment signal indicates that it is impossible to determine whether the dual power supply circuits are connected to the same input source, the control signal generation unit 510 outputs a first control signal, and the constant current switch unit 520 controls the constant current source to supply power to the sampling end of the target power supply circuit within the target time under the first control signal.

[0120] If the input voltage of the dual-path power supply circuit can determine whether the dual-path power supply circuit is connected to different input sources, then the current sampling time control unit 530 controls the control signal generation unit 510 to output the second control signal after a target time, so that the constant current switch unit 520 disconnects the connection between the constant current source and the sampling end of the target power supply circuit based on the second control signal, and the input current of the target power supply circuit can be sampled to determine whether the input sources of the dual-path power supply circuit are the same input source.

[0121] In some optional embodiments, the constant current driving module 500 further comprises a current sampling time control unit 530, an input end of the current sampling time control unit 530 is connected to the first output end of the input source judgment module 100, and an output end of the current sampling time control unit 530 is connected to the control end of the control signal generation unit 510.

[0122] The current sampling time control unit 530 is used to control the control signal generation unit 510 to output the second control signal after a target time when the constant current source supplies power to the sampling end of the target power supply circuit, so that the constant current switch unit 520 disconnects the connection between the constant current source and the sampling end of the target power supply circuit based on the second control signal, and the target time is less than the time length from the existence of the input voltage of the target power supply circuit to the start of work.

[0123] Because the connection of the constant current source will affect the normal work of the power supply circuit, the time for the constant current source to supply power to the target power supply circuit, i.e., the current sampling time, needs to be controlled in the present application, so that the constant current source is disconnected from the sampling end of the target power supply circuit after a target time when the constant current source supplies power to the target power supply circuit. The delay and disconnection are controlled by the current sampling time control unit 530.

[0124] In some optional embodiments, the current sampling time control unit 530 comprises a first capacitor C8, a diode D2, and a second capacitor C9, wherein a first end of the first capacitor C8 is connected to the first output end of the input source judgment module 100, and a second end of the first capacitor C8 is grounded; a cathode of the diode D2 is connected to the first end of the first capacitor C8, and an anode of the diode D2 is connected to the control end of the control signal generation unit 510; a first end of the second capacitor C9 is connected to the control end of the control signal generation unit 510, and a second end of the second capacitor C9 is grounded; the charging time of the second capacitor C9 is greater than the charging time of the first capacitor C8, and the charging time of the second capacitor C9 is the target time.

[0125] In combination with Figure 5Wherein the VCC voltage charges the first capacitor C8 through the resistor R6, charges the second capacitor C9 through the resistor R6 and the resistor R33, the first capacitor C8 charges faster than the second capacitor C9, and finally the voltage of the first capacitor C8 and the second capacitor C9 is equal, the diode D2 is in the off state, when the second capacitor C9 is full, the b electrode voltage of the triode Q16 is equal to the e electrode voltage, the triode Q16 is off, and the MOS tube Q17 is also off, so the time of the constant current source supplying power to the sampling resistor R1 of the target power supply circuit is the time of the second capacitor C9 being full. In addition, if the switching of the current limiting mode is required, the switching time of the current limiting mode switching is less than the time of the second capacitor C9 being full, that is, before the second capacitor C9 is full, the switching of the current limiting mode has been completed.

[0126] In one of the optional embodiments, the dual-path input control circuit further comprises: a locking module 400, an input end of the locking module 400 receiving a working signal of the target power supply circuit, and an output end of the locking module 400 being connected with an input end of the current limiting mode control module 200; the locking module 400 is used for inputting a locking signal to the current limiting mode control module 200 in the case of the working signal of the target power supply circuit, the locking signal being used for instructing the current limiting mode control module 200 to adopt the first current limiting mode in the case of the dual-path power supply circuit connecting different input sources, and to adopt the second current limiting mode in the case of the dual-path power supply circuit connecting the same input source.

[0127] Wherein after the target power supply circuit normally works, the locking module 400 has an input, that is, the target power supply circuit has a working signal, which is the PV2_PWM signal of the switching tube of the second power supply circuit PV2, in the case that the first judging signal cannot determine whether the dual-path power supply circuit is the same input source, and the second judging signal determines that the dual-path power supply circuit connects different input sources, the target power supply circuit works, and the current limiting mode control module 200 adopts the first current limiting mode, but as time goes on, the input current sampled by the current sampling unit is greater than the current threshold, so that the input of the current limiting mode control module 200 changes, and then the current limiting mode control module 200 switches the current limiting mode. In order to avoid this situation, the locking module 400 is introduced, so that the input of the current limiting mode control module 200 does not change, so as to keep the first current limiting mode.

[0128] Wherein in combination with Figure 3As shown, the lock module 400 includes a switch tube Q14, the gate of the switch tube Q14 is connected with the second end of the resistor R28 and the first end of the resistor R30, the drain is connected with the second end of the resistor R24 and the base of the triode Q12, the first end of the resistor R24 and the first end of the resistor R22 are connected with the power supply VCC, the source of the switch tube Q14 and the second end of the resistor R30 are connected with the ground GND, the emitter of the triode Q12 is connected with the second end of the resistor R22, the collector is connected with the first end of the resistor R26, the second end of the resistor R26 is connected with the positive input end of the operational amplifier U3B, the inverting input end of the operational amplifier U3B is grounded, the output end is connected with the first end of the resistor R29, the second end of the resistor R29 is connected with the first end of the capacitor C7, the first end of the resistor R32 and the gate of the switch tube Q15, the second end of the capacitor C7, the second end of the resistor R32 and the source of the switch tube Q15 are connected, the drain of the switch tube Q15 is connected with the second end of the resistor R25, the first end of the resistor R25 is connected with the input end of the current limiting mode control module 200.

[0129] When the second power supply circuit PV2 works normally, that is, the switch tube of the second power supply circuit PV2 is pulsed by the PV2_PWM signal, when the PV2_PWM signal is at high level, the switch tube Q14 is turned on, then the base of the triode Q12 is at low level, the triode Q12 is turned on, the VCC voltage is input to the same-phase input end 5 of the operational amplifier U3B through the triode Q12, the output voltage of the operational amplifier U3B is charged to the capacitor C7 through the RC circuit (resistor R29, capacitor C7), with the gradually increasing of the duty ratio of the PV2_PWM (soft start process), the voltage of the capacitor C7 also gradually increases, when the voltage of the capacitor C7 is greater than the gate turn-on voltage of the switch tube Q15, the switch tube Q15 is turned on, the 2 pin of the AND gate U4 is pulled low, so that the input of the current limiting mode control module 200 is unchanged.

[0130] In one of the optional embodiments, the current limiting mode control module 200 includes a first judgment unit 210, an interlocking unit 220 and a selection unit 230, wherein the first input end and the second input end of the first judgment unit 210 are respectively connected with the two output ends of the input source judgment module 100, and the second input end is also connected with the output end of the lock module 400; the input end of the interlocking unit 220 is connected with the output end of the first judgment unit 210; the input end of the selection unit 230 is connected with the output end of the interlocking unit 220.

[0131] The first judging unit 210 is configured to generate a third judging signal for judging whether the dual-path power supply circuit is connected to the same input source based on the first judging signal and the second judging signal, the interlocking unit 220 is configured to output a second current limiting mode selection signal to the selection unit 230 based on the third judging signal, so that the selection unit 230 adopts the second current limiting mode; and in the case that the output of the first judging unit 210 is converted into a fourth judging signal under the locking signal of the locking module 400, the interlocking unit 220 outputs the second current limiting mode selection signal to the selection unit 230; the first judging unit 210 is further configured to generate a fourth judging signal for judging whether the dual-path power supply circuit is connected to different input sources based on the first judging signal and the second judging signal, and the interlocking unit 220 is further configured to output a first current limiting mode selection signal to the selection unit 230 based on the fourth judging signal, so that the selection unit 230 adopts the first current limiting reference.

[0132] The first judging unit 210 includes an AND gate U4, a first input end of which is connected to the output end of the voltage comparison unit 110, a second input end of which is connected to the output end of the current comparison unit 120 and a first end of the capacitor C6, a second end of the capacitor C6 being grounded, and an output end of the AND gate U4 being connected to a first end of the interlocking unit 220. The interlocking unit 220 includes a transistor Q11 and a transistor Q13, wherein an emitter of the transistor Q11 is connected to a power supply VCC and a first end of a resistor R20, a second end of the resistor R20, a base of the transistor Q11 and a first end of a resistor R23 are connected, a collector of the transistor Q11 is connected to a first end of a resistor R27, a base of the transistor Q13 and a second end of the resistor R27 are connected, an emitter is grounded, and a collector is connected to a second end of the resistor R23, wherein the second end of the resistor R23 is also connected to an input end of the selection unit 230, and the selection unit 230 is configured to select a current limiting mode, which can be realized by a relay RLY1.

[0133] In order to facilitate understanding of the working principle of the dual-path input control circuit in the present application, combined with Figure 3 , the following description is made:

[0134] When both the dual power supply circuit have input source input, the voltage of the first power supply circuit PV1 and the second power supply circuit PV2 is sampled, the sampling value enters the 3-pin in-phase input end and the 2-pin reverse-phase input end of the operational amplifier U3A respectively, the output value of the operational amplifier U3A enters the absolute value output circuit and then enters the 3-pin reverse-phase input end of the comparator U2, when the absolute value of the difference of the actual input voltage of the first power supply circuit PV1 and the second power supply circuit PV2 is greater than 2V (i.e. the target value above), it is indicated that the dual power supply circuit is connected with different input sources, i.e. the value Vsamp output by the absolute value output circuit is greater than the value of the reference voltage Vref, the comparator U2 outputs low level, at this time the base of the triode Q10 is low level, the triode Q10 is cut off, the gate of the MOS tube Q9 is low level, the MOS tube Q9 is cut off, the enable pin PV2_EN of the second power supply circuit PV2 is not pulled low, and the first power supply circuit PV1 and the second power supply circuit PV2 can work simultaneously. At the same time, the 1-pin input end of the AND gate U4 is low level, no matter the 2-pin input is high or low level, the AND gate U4 outputs low level, the triode Q13 is cut off because the base is low level, the triode Q11 is cut off because the b electrode and the e electrode are at the same potential, the relay RLY1 does not work, and the first power supply circuit PV1 and the second power supply circuit PV2 work in the first current limiting mode.

[0135] This working condition can also include that only the first power supply circuit PV1 is connected with the input source or only the second power supply circuit PV2 is connected with the input source.

[0136] When both the dual power supply circuit have input source input, the voltage of the first power supply circuit PV1 and the second power supply circuit PV2 is sampled, the sampling value enters the 3-pin in-phase input end and the 2-pin reverse-phase input end of the operational amplifier U3A respectively, the output value of the operational amplifier U3A enters the absolute value output circuit and then enters the 3-pin reverse-phase input end of the comparator U2, when the absolute value of the difference of the actual input voltage of the first power supply circuit PV1 and the second power supply circuit PV2 is greater than 2V (i.e. the target value above), it is indicated that the dual power supply circuit is connected with different input sources, i.e. the value Vsamp output by the absolute value output circuit is greater than the value of the reference voltage Vref, the comparator U2 outputs low level, at this time the base of the triode Q10 is low level, the triode Q10 is cut off, the gate of the MOS tube Q9 is low level, the MOS tube Q9 is cut off, the enable pin PV2_EN of the second power supply circuit PV2 is not pulled low, and the first power supply circuit PV1 and the second power supply circuit PV2 can work simultaneously. At the same time, the 1-pin input end of the AND gate U4 is low level, no matter the 2-pin input is high or low level, the AND gate U4 outputs low level, the triode Q13 is cut off because the base is low level, the triode Q11 is cut off because the b electrode and the e electrode are at the same potential, the relay RLY1 does not work, and the first power supply circuit PV1 and the second power supply circuit PV2 work in the first current limiting mode.

[0137] 1) When the second power supply circuit PV2 current sampling value is greater than 0.1V (i.e. the current threshold value), that is, the current flowing through the sampling resistor R2 of the second power supply circuit PV2 is greater than 2A, it indicates that the dual power supply circuit is connected to the same source, the comparator U5 outputs high level, that is, the 1 pin and the 2 pin of the AND gate U4 input high level, and the 4 pin of the AND gate U4 outputs high level, the transistor Q13 is turned on because the base is high level, the relay RLY1 coil has a current loop, the relay RLY1 works, and the current limiting mode of the first power supply circuit PV1 and the second power supply circuit PV2 adopts the second current limiting mode.

[0138] At the same time, the transistor Q11 is turned on because the e voltage is greater than the b voltage, at this time the transistor Q11 and the transistor Q13 form a self-locking, keep the base of the transistor Q13 high level, make the transistor Q13 continuously conduct, let the relay RLY1 continuously work, and the dual power supply circuit works in the second current limiting mode. If there is no self-locking, when the second power supply circuit PV2 works, that is, the switch tube of the second power supply circuit PV2 has the PV2_PWM signal, it will pull down the 2 pin of the AND gate U4, then the AND gate U4 outputs low level, then the transistor Q13 is cut off, the relay RLY1 does not work, which will make the first power supply circuit PV1 and the second power supply circuit PV2 work in the first current limiting mode, which will damage the power supply circuit.

[0139] At the same time, the VCC voltage charges the capacitor C5 through the resistor R6 and the resistor R12, when the voltage of the capacitor C5 is greater than the voltage of the zener DZ1, the zener DZ1 is broken down, and when the voltage of the 1 pin of the zener DZ1 is greater than the Vbe(th) of the transistor Q10, the transistor Q10 is turned on, the gate of the MOS Q9 is pulled low, the MOS Q9 is cut off, and the enable pin PV2_EN of the second power supply circuit PV2 is no longer pulled low, and the second power supply circuit PV2 starts to work. It should be noted that the time for charging the capacitor C5 to break down the zener DZ1 and make the transistor Q10 conduct should be greater than the time for completing the switching of the current limiting reference.

[0140] When the second power supply circuit PV2 starts to work and charge, that is, the switch tube of the second power supply circuit PV2 has the PV2_PWM signal, when the PV2_PWM signal is high, the MOS Q14 is turned on, then the base of the transistor Q12 is low, the transistor Q12 is turned on, the VCC voltage is input to the non-inverting input terminal 5 of the operational amplifier U3B through the transistor Q12, the output voltage of the operational amplifier U3B charges the capacitor C7 through the RC circuit (resistor R29, capacitor C7), as the duty ratio of the PV2_PWM gradually increases (soft start process), the voltage of the capacitor C7 also gradually increases, when the voltage of the capacitor C7 is greater than the gate turn-on voltage of the MOS Q15, the MOS Q15 is turned on, and the 2 pin of the AND gate U4 is pulled low.

[0141] So that the maximum input current of the first power supply circuit PV1 and the second power supply circuit PV2 is limited to 20A due to the current limiting reference halved, keeping the single PV maximum 1200W operation, so that the input current and output current of the dual power supply circuit do not exceed the rated current of the fuses F1, F2, F3, F4, so that the dual power supply circuit works stably and reliably.

[0142] 2) When the current sampling value of the second power supply circuit PV2 is less than 0.1V, that is, the current flowing through the sampling resistor R2 of the second power supply circuit PV2 is less than 2A, it means that the input source of the dual power supply circuit is not the same source, the comparator U5 outputs low level, that is, the 2 pin of the AND gate U4 is low level, the 1 pin is high level, then the 4 pin of the AND gate U4 outputs low level, the transistor Q13 is cut off due to the low level of the base, the transistor Q11 is cut off due to the same potential of the b electrode and the e electrode, the relay RLY1 does not work, and the first power supply circuit PV1 and the second power supply circuit PV2 work in the first current limiting mode.

[0143] Similarly, the VCC voltage charges the capacitor C5 through the resistor R6 and the resistor R12, and when the voltage of the capacitor C5 is greater than the voltage of the zener DZ1, the zener DZ1 is broken down, and after the breakdown, the voltage of the 1 pin of the zener DZ1 is greater than the Vbe(th) of the transistor Q10, the transistor Q10 is turned on, the gate of the MOS tube Q9 is pulled low, the MOS tube Q9 is cut off, and the enable pin PV2_EN of the second power supply circuit PV2 is no longer pulled low, and the second power supply circuit PV2 starts to work.

[0144] When the second power supply circuit PV2 starts to work and charge, that is, the switch tube of the second power supply circuit PV2 has the PV2_PWM signal, when the PV2_PWM signal is at high level, the MOS tube Q14 is turned on, then the base of the transistor Q12 is at low level, the transistor Q12 is turned on, the VCC voltage is input to the non-inverting input terminal 5 of the operational amplifier U3B through the transistor Q12, the output voltage of the operational amplifier U3B charges the capacitor C7 through the RC circuit (resistor R29, capacitor C7), and as the duty ratio of the PV2_PWM gradually increases (soft start process), the voltage of the capacitor C7 also gradually increases, and when the voltage of the capacitor C7 is greater than the gate turn-on voltage of the MOS tube Q15, the MOS tube Q15 is turned on, and the 2 pin of the AND gate U4 is pulled low. If the 2 pin of the AND gate U4 is not pulled low, when the second power supply circuit PV2 works and charges, the charging current of the second power supply circuit PV2 will definitely be greater than 2A, at this time, the current sampling value of the second power supply circuit PV2 will be greater than 0.1V, so that the comparator U5 outputs high level, the AND gate U4 outputs high level, and the relay RLY1 works to switch the current limiting reference to the current limiting reference 2.

[0145] So, the application compares the input voltage sampling of the dual power supply circuit, if greater than the voltage threshold Vref, the first current limiting mode is adopted; if less than the voltage threshold Vref, the second power supply circuit PV2 enable foot is pulled low, the second power supply circuit PV2 stops working, the first power supply circuit PV1 keeps working, when the first power supply circuit PV1 works and charges, the second power supply circuit PV2 current sampling resistor R2 is sampled, if the sampling value is greater than 0.1V, it is the same source, the second current limiting mode is adopted; if the sampling value is less than 0.1V, it is not the same source, the first current limiting mode is adopted, after the current limiting mode switching is completed, the gate of MOS tube Q9 is pulled low through the delay control circuit, the enable foot of the second power supply circuit PV2 is no longer pulled low, the first power supply circuit PV1 and the second power supply circuit PV2 work together to charge.

[0146] In order to facilitate understanding of the working principle of the dual input control circuit in the application, combined with Figure 5 as shown, the following description is made:

[0147] When the dual power supply circuit has input source input, the application samples the input voltage of the first power supply circuit PV1 and the second power supply circuit PV2, the sampling values enter the non-inverting input terminal of the 1 foot and the inverting input terminal of the 3 foot of the operational amplifier U3 respectively, the output value of the operational amplifier U3 enters the comparator U2A after the absolute value output circuit, when the absolute value of the difference between the actual input voltage of the first power supply circuit PV1 and the second power supply circuit PV2 is greater than 2V (i.e. the target value in the above), it is indicated that the dual power supply circuit is connected with different input sources, that is, the value Vsamp output by the absolute value output circuit is greater than the value of the voltage threshold Vref, the comparator U2A outputs low level, at this time, the transistor Q16 is cut off, the MOS tube Q17 is cut off, and the constant current source does not form a loop with the sampling resistor R1 of the first power supply circuit PV1. At the same time, the 1 foot input terminal of the AND gate U4 is low level, no matter the 2 foot input is high or low level, the AND gate U4 outputs low level, the transistor Q13 is cut off because the base is low level, the transistor Q11 is cut off because the b electrode and the e electrode are at the same potential, the relay RLY1 does not work, and the first power supply circuit PV1 and the second power supply circuit PV2 work in the first current limiting mode.

[0148] This working condition can also include that only the first power supply circuit PV1 accesses the input source or only the second power supply circuit PV2 accesses the input source.

[0149] When both the dual power supply circuit has input source input, the present application to the first power supply circuit PV1 and the second power supply circuit PV2 input voltage sampling, sampling value respectively into the 1 foot of the operational amplifier U3 same phase input end and 3 foot opposite input end, the output value of the operational amplifier U3 into the absolute value output circuit after entering the 2 foot of the comparator U2A opposite input end, when the first photovoltaic power supply circuit PV1 and the second power supply circuit PV2 input voltage is actually less than 2V (i.e. the target value in the above), namely the absolute value output circuit output value Vsamp is less than the value of voltage threshold Vref, comparator U2A output high level, at this time the e pole voltage of the triode Q16 is greater than the b pole voltage, the triode Q16 is turned on, VCC voltage through the resistance R6, triode Q16 resistance R34 and resistance R35 voltage division, control MOS tube Q17 is turned on, then the constant current source in the target time for the sampling end of the first power supply circuit PV1 power supply. At this time, the first power supply circuit PV1 current sampling sampling resistance R1 of the first power supply circuit PV1:

[0150] The first power supply circuit PV1 current sampling value is 0.5V (specifically can refer to the second current sampling value in the above), then it is explained that the dual power supply circuit is connected with the same source, comparator U6A and U6B output high level, that is, the 1 foot and 2 foot of the and gate U7 input high level, then the 4 foot of the and gate U7 output high level, the 1 foot and 2 foot of the and gate U4 input high level, then the 4 foot of the and gate U4 output high level, the triode Q13 is turned on because the base is high level, the relay RLY1 coil has current loop, the relay RLY1 works, the first power supply circuit PV1 and the second power supply circuit PV2 limit current mode adopts the second limit current mode.

[0151] At the same time, the triode Q11 is turned on because the e pole voltage is greater than the b pole voltage, at this time the triode Q11 and the triode Q13 form interlocking, keep the triode Q13 base high level, make the triode Q13 continuously conduct, let the relay RLY1 continuously work, the dual power supply circuit adopts the second limit current mode work. If there is no interlocking circuit, when the first power supply circuit PV1 works, the current sampling value of the first power supply circuit PV1 will be greater than the first threshold Iref1, then the 1 foot of the and gate U7 is low level, the and gate U7 output low level, the and gate U4 also output low level, then the triode Q13 is cut off, the relay RLY1 does not work, will make the first power supply circuit PV1 and the second power supply circuit PV2 limit current mode adopts the first limit current mode work, make the dual power supply circuit damage.

[0152] At the same time, the VCC voltage charges the first capacitor C8 through the resistor R6 and charges the second capacitor C9 through the resistor R6 and the resistor R33. The first capacitor C8 charges faster than the second capacitor C9, and the voltages of the first capacitor C8 and the second capacitor C9 are eventually equal. The diode D2 is in the off state. When the second capacitor C9 is fully charged, the b electrode voltage of the triode Q16 is equal to the e electrode voltage, the triode Q16 is off, and the MOS tube Q17 is also off. Therefore, the time for the constant current source to supply power to the first power supply circuit PV1 for current sampling is the time for the second capacitor C9 to be fully charged. The time is the target time, which needs to be less than the time for the input voltage of the power supply circuit to start working, so as to avoid affecting the current sampling when the circuit normally works.

[0153] In this way, the maximum input current of the first power supply circuit PV1 and the second power supply circuit PV2 is limited to 20A due to the current limiting mode, and is maintained at the maximum 1200W working of the single power supply circuit. The input current and the output current of the dual power supply circuit do not exceed the rated current of the fuses F1, F2, F3 and F4, so that the dual power supply circuit works stably and reliably.

[0154] When the current sampling value of the first power supply circuit PV1 is 1V (i.e. the first current sampling value in the above), it indicates that the dual power supply circuit is connected to different input sources. The comparator U6A outputs a low level, the comparator U6B outputs a high level, the pin 1 of the AND gate U7 is a low level, the pin 2 is a high level, the pin 4 of the AND gate U7 outputs a low level, the pin 1 of the AND gate U4 is a high level, the pin 2 is a low level, the pin 4 of the AND gate U4 outputs a low level, the triode Q13 is off due to the low level of the base, the triode Q11 is off due to the equal potential of the b electrode and the e electrode, the relay RLY1 does not work, and the first power supply circuit PV1 and the second power supply circuit PV2 work in the first current limiting mode.

[0155] Similarly, the VCC voltage charges the first capacitor C8 through the resistor R6 and charges the second capacitor C9 through the resistor R6 and the resistor R33. The first capacitor C8 charges faster than the second capacitor C9, and the voltages of the first capacitor C8 and the second capacitor C9 are eventually equal. The diode D2 is in the off state. When the second capacitor C9 is fully charged, the b electrode voltage of the triode Q16 is equal to the e electrode voltage, the triode Q16 is off, and the MOS tube Q17 is also off. Therefore, the time for the constant current source to supply power to the first power supply circuit PV1 for current sampling is the time for the second capacitor C9 to be fully charged.

[0156] Thus, the application compares the input voltage sampling through the dual power supply circuit, if greater than the voltage threshold Vref, the first current limiting mode is adopted, if less than the voltage threshold Vref, the first power supply circuit PV1 is powered through the constant current source, to judge whether it is the same input source through the current sampling value of the first power supply circuit PV1, if the sampling value is 0.5V, it is explained that it is the same source, the second current limiting reference is adopted, if the sampling value is 1V, it is explained that it is not the same source, the first current limiting reference is adopted.

[0157] In summary, the energy storage power supply of the dual power supply circuit can complete the detection of whether it is the same input source and the adjustment of the current limiting mode through the dual input control circuit of the application during the period from the input source being connected to the dual power supply circuit to the dual power supply circuit starting to work, so that the maximum input current of the dual power supply circuit is limited to 20A in any working condition, the reliability of the dual power supply circuit device is guaranteed, and the dual power supply circuit is prevented from being damaged.

[0158] The application also relates to an energy storage device comprising the dual input control circuit in any one of the above embodiments.

[0159] In the description of the present application, the description of the terms "some embodiments", "other embodiments", and the like means that the specific features, structures, materials or characteristics described in combination with the embodiments or examples are contained in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0160] The technical features of the above embodiments can be combined arbitrarily, and in order to make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered that it is within the scope of the present application.

[0161] The above embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as the limitation of the scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A dual input control circuit applied to a dual power supply circuit, characterized by, The circuit comprises: an input source judgment module configured to judge whether the dual-path power supply circuit is connected to the same input source; a current limiting mode control module configured to adopt a first current limiting mode when the dual-path power supply circuit is connected to different input sources, and adopt a second current limiting mode when the dual-path power supply circuit is connected to the same input source, wherein the current limiting value corresponding to the first current limiting mode is greater than the current limiting value corresponding to the second current limiting mode; the input source judgment module is further configured to generate a first judgment signal based on the input voltage of the dual-path power supply circuit, generate a second judgment signal based on the input current of a target power supply circuit, and judge whether the dual-path power supply circuit is connected to the same input source based on the first judgment signal and the second judgment signal, wherein the target power supply circuit is one of the dual-path power supply circuits; the circuit further comprises: a control signal generation module configured to control the target power supply circuit to stop working for a preset time when the first judgment signal cannot judge whether the dual-path power supply circuit is connected to the same input source, so that the input source judgment module generates the second judgment signal based on the input current of the target power supply circuit when the target power supply circuit stops working; the control signal generation module comprises: a switch control unit, an input end of the switch control unit receiving the first judgment signal output by the input source judgment module; a switch unit, an input end of the switch unit being connected to an output end of the switch control unit; when the first judgment signal indicates that the dual-path power supply circuit is connected to different input sources, the switch control unit outputs a first control signal to the switch unit, so that the switch unit controls the dual-path power supply circuit to work; when the first judgment signal cannot judge whether the dual-path power supply circuit is connected to the same input source, the switch control unit outputs a second control signal of the preset time to the switch unit, so that the switch unit controls the target power supply circuit to stop working for the preset time.

2. The circuit of claim 1, wherein, The input source judgment module is further configured to generate the second judgment signal based on the input current of the target power supply circuit when the target power supply circuit stops working.

3. The circuit of claim 2, wherein, The input source judgment module is configured to determine that the dual-path power supply circuit is connected to the same input source when the absolute value of the difference between the input voltages of the dual-path power supply circuit is greater than or equal to a voltage threshold value; and determine that the dual-path power supply circuit is connected to the same input source when the absolute value of the difference between the input voltages of the dual-path power supply circuit is less than the voltage threshold value, and the input current of the target power supply circuit when the target power supply circuit stops working is greater than or equal to a current threshold value; and determine that the dual-path power supply circuit is connected to different input sources when the input current of the target power supply circuit when the target power supply circuit stops working is less than the current threshold value.

4. The circuit of claim 1, wherein, The input source judgment module comprises: a voltage comparison unit, two input ends of the voltage comparison unit receiving the input voltages of the dual-path power supply circuit, an output end of the voltage comparison unit being connected to a first input end of the current limiting mode control module, and configured to compare the input voltages of the dual-path power supply circuit to obtain the first judgment signal; The current comparison unit has one input end receiving a sampling current of the target power supply circuit and another input end receiving a current threshold, and is configured to compare the input current when the target power supply circuit stops working with the current threshold to obtain a second judgment signal.

5. The circuit of claim 4, wherein, The voltage comparison unit includes: The operational amplifier unit has two input ends receiving input voltages of the dual-path power supply circuit; The absolute value output unit has an input end connected with an output end of the operational amplifier unit and is configured to obtain an absolute value of the difference between the input voltages of the dual-path power supply circuit obtained by the operational amplifier unit; The comparison unit has one input end connected with an output end of the absolute value output unit and another input end receiving a voltage threshold, and is configured to obtain a first judgment signal based on the absolute value of the difference between the input voltages of the dual-path power supply circuit and the voltage threshold.

6. The circuit of claim 1, wherein, The switch control unit includes: The first control sub-unit has an input end receiving the first judgment signal output by the input source judgment module and an output end connected with an input end of the switch unit; The delay sub-unit has an input end receiving the first judgment signal output by the input source judgment module; The second control sub-unit has an input end connected with an output end of the delay sub-unit and an output end connected with an input end of the switch unit; The delay sub-unit is configured to output a delay signal to the second control sub-unit after a preset time is delayed in a case where the first judgment signal cannot judge whether the dual-path power supply circuit is connected with the same input source; and the second control sub-unit is configured to output a first control signal to the switch unit to make the switch unit control the target power supply circuit to work after receiving the delay signal, wherein the preset time is greater than a switching time length from the first current limiting mode to the second current limiting mode.

7. The circuit according to any one of claims 1 to 6, characterized in that The circuit further includes: The lock module has an input end receiving a working signal of the target power supply circuit and an output end connected with an input end of the current limiting mode control module; The lock module is configured to input a lock signal to the current limiting mode control module in a case where the working signal of the target power supply circuit is input, and the lock signal is configured to instruct the current limiting mode control module to adopt the first current limiting mode in a case where the dual-path power supply circuit is connected with different input sources.

8. The circuit of claim 7, wherein, The current limiting mode control module includes: The first judgment unit has a first input end and a second input end connected with two output ends of the input source judgment module respectively, and the second input end is further connected with an output end of the lock module; The interlocking unit has an input end connected with an output end of the first judgment unit; The selection unit has an input end connected with an output end of the interlocking unit; The first judging unit is configured to generate a third judging signal for judging whether the dual-path power supply circuit is connected to the same input source based on the first judging signal and the second judging signal, and the interlocking unit is configured to output a second current-limiting mode selection signal to the selection unit based on the third judging signal, so that the selection unit adopts the second current-limiting mode; and in the case that the output of the first judging unit is converted into a fourth judging signal under the locking signal of the locking module, the interlocking unit outputs a second current-limiting mode selection signal to the selection unit. The first judging unit is further configured to generate a fourth judging signal for judging whether the dual-path power supply circuit is connected to different input sources based on the first judging signal and the second judging signal, and the interlocking unit is further configured to output a first current-limiting mode selection signal to the selection unit based on the fourth judging signal, so that the selection unit adopts the first current-limiting mode.

9. An energy storage device, characterized by, The dual-path input control circuit according to any one of claims 1-8.

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