Fault protection circuit, electronic equipment and energy storage system

Abstract

A fault protection circuit, an electronic device and an energy storage system, the fault protection circuit is applied to a first device, the first device is also used for being connected with at least one target device, and the fault protection circuit comprises a receiving module, a first isolation module, a one-way conduction module, a second isolation module and a control module, the receiving module is used for receiving a fault enable signal and outputting the fault enable signal to the first isolation module; the first isolation module is used for outputting a fault signal according to the fault enable signal; the one-way conduction module is used for transmitting a fault signal in one way; the second isolation module is used for receiving a fault signal; and the control module is used for determining that at least one of the first equipment and the target equipment has a fault under the condition that the fault signal is received. The devices are connected with each other through the fault protection circuit, so that the devices can obtain the fault information in time, at least one device in the current system is confirmed to have a fault, a corresponding fault protection strategy is carried out, and the operation safety of the whole system is improved.

Description

Technical Field

[0001] The present application belongs to the field of electronic circuit technology, and in particular relates to a fault protection circuit, an electronic device and an energy storage system. Background Art

[0002] At present, more and more systems are composed of multiple electronic devices. In a multi-device system, multiple electronic devices need to be able to work independently, and they also need to perform corresponding operations on the signals of other connected electronic devices to jointly realize corresponding functions. In order to ensure the security of the system, it is usually required that when one of the electronic devices fails, the other connected electronic devices can be aware of the failure and execute corresponding policy protection strategies to ensure the safety of system operation. In related multi-device systems, how to improve the safety of system operation is an urgent problem to be solved. Utility Model Content

[0003] The purpose of the present application is to provide a fault protection circuit, an electronic device and an energy storage system, aiming to improve the operating safety of a multi-device system.

[0004] A first aspect of an embodiment of the present application provides a fault protection circuit, which is applied to a first device; the first device is also used to connect to at least one target device; the fault protection circuit includes: a receiving module, which is used to receive a fault enable signal and output it to a first isolation module; the first isolation module, the input end of the first isolation module is connected to the output end of the receiving module, and the first isolation module is used to output a fault signal according to the fault enable signal; a unidirectional conduction module, the input end of the unidirectional conduction module is connected to the output end of the first isolation module, and the unidirectional conduction module is used to unidirectionally transmit the fault signal to a second isolation module or a connected target device; the second isolation module, the input end of the second isolation module is connected to the output end of the unidirectional conduction module and at least one of the target devices, and the second isolation module is used to receive the fault signal from the unidirectional conduction module and output it to a control module; the second isolation module is also used to receive the fault signal output by the target device; the control module, the control module is connected to the output end of the second isolation module, and is used to determine that at least one of the first device and the target device has a fault when the fault signal is received.

[0005] In one embodiment, the target device includes a second device; the fault protection circuit also includes a first protection terminal, which is connected to the input end of the second isolation module and is used to be connected to the first protection terminal in the fault protection circuit of the second device through a wire.

[0006] In one embodiment, the target device also includes a third device; the fault protection circuit also includes a second protection terminal; the second protection terminal is connected to the input end of the second isolation module, and is used to be connected to the first protection terminal in the fault protection circuit of the third device through a wire.

[0007] In one embodiment, the target device includes a second device; the fault protection circuit also includes a first protection terminal and a second protection terminal; the first protection terminal is connected to the output end of the first isolation module, and is used to be connected to the second protection terminal in the fault protection circuit of the second device through a first wire; the second protection terminal is connected to the input end of the second isolation module, and is used to be connected to the first protection terminal in the fault protection circuit of the second device through a second wire.

[0008] In one embodiment, the target device also includes a third device; the fault protection circuit also includes a third protection terminal and a fourth protection terminal; the third protection terminal is connected to the output end of the first isolation module, and is used to be connected to the first protection terminal in the fault protection circuit in the third device through a third wire; the fourth protection terminal is connected to the input end of the second isolation module, and is used to be connected to the second protection terminal in the fault protection circuit of the third device through a fourth wire.

[0009] In one embodiment, the first isolation module includes a control switch, a first photoelectric coupler, a first resistor and a second resistor; the positive electrode of the light emitter of the first photoelectric coupler is connected to the first working power supply through the first resistor, the negative electrode of the light emitter of the first photoelectric coupler is connected to the first end of the control switch, the second end of the control switch is grounded, and the controlled end of the control switch is connected to the output end of the receiving module; the first end of the optical receiver of the first photoelectric coupler is connected to the second working power supply through the second resistor, and the second end of the optical receiver of the first photoelectric coupler is connected to the input end of the unidirectional conduction module.

[0010] In one embodiment, the second isolation module includes a second photoelectric coupler; the positive pole of the light emitter of the second photoelectric coupler is connected to the output end of the unidirectional conduction module, the negative pole of the light emitter of the second photoelectric coupler is grounded, the first end of the light receiver of the second photoelectric coupler is connected to the control module, and the second end of the light receiver of the second photoelectric coupler is grounded.

[0011] In one embodiment, the one-way conducting module includes a diode, an anode of the diode is connected to an input end of the one-way conducting module, and a cathode of the diode is connected to an output end of the one-way conducting module.

[0012] A second aspect of an embodiment of the present application provides an electronic device, wherein the electronic device includes the fault protection circuit as described above.

[0013] A third aspect of an embodiment of the present application provides an energy storage system, comprising a plurality of electronic devices as described above.

[0014] Compared with the related art, the embodiment of the present application has the following beneficial effects: the input end of the second isolation module of the first device can be connected to the fault detection circuit of at least one target device, so that the first device can send the fault signal detected by itself to the connected target device, and can also receive the fault signal input by the target device. Through the embodiment of the present application, whether the target device fails or the first device fails, the first device and the target device can obtain the fault information in time, so as to confirm that at least one device in the current system has a fault, so as to implement the corresponding fault protection strategy and improve the safety of the operation of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a fault protection circuit provided in one embodiment of the present application;

[0016] Figure 2 Another structural schematic diagram of a fault protection circuit provided in one embodiment of the present application;

[0017] Figure 3 Another structural schematic diagram of a fault protection circuit provided in an embodiment of the present application;

[0018] Figure 4 for Figure 3 A specific circuit diagram of the embodiment shown;

[0019] Figure 5 Another structural schematic diagram of a fault protection circuit provided in an embodiment of the present application;

[0020] Figure 6 Another structural schematic diagram of a fault protection circuit provided in an embodiment of the present application;

[0021] Figure 7 for Figure 6 A specific circuit diagram of the embodiment shown;

[0022] Figure 8 A schematic diagram of the structure of an electronic device provided in one embodiment of the present application;

[0023] Fig. 9 A schematic diagram of the structure of an energy storage system provided in one embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0025] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] Figure 1 A schematic diagram of the structure of a fault protection circuit provided by an embodiment of the present application is shown. For the sake of convenience, only the parts related to the present embodiment are shown, which are described in detail as follows:

[0028] The fault protection circuit 10 is applied to the first device 21 to implement fault protection for the first device 21. The first device 21 is used to connect to at least one target device 20. It should be noted that the first device 21 can be connected to at least one target device 20 to form a multi-device system 30. The first device 21 can be directly connected to multiple target devices 20, or can be indirectly connected to more target devices through the target device 20 to form a multi-device system 30. The first device 21 can also be connected to other devices as a target device 20. Each target device 20 can include a fault protection circuit.

[0029] The fault protection circuit 10 includes a receiving module 100 , a first isolation module 200 , a unidirectional conduction module 300 , a second isolation module 400 and a control module 500 .

[0030] The receiving module 100 is used to receive a fault enable signal and output it to the first isolation module 200. The input end of the first isolation module 200 is connected to the output end of the receiving module 100, and the first isolation module 200 is used to output a fault signal according to the fault enable signal. The input end of the unidirectional conduction module 300 is connected to the output end of the first isolation module 200, and the unidirectional conduction module 300 is used to unidirectionally transmit the fault signal to the second isolation module 400 or the connected target device 20. The input end of the second isolation module 400 is connected to the output end of the unidirectional conduction module 300 and at least one target device 20. The second isolation module 400 is used to receive a fault signal from the unidirectional conduction module 300 and output it to the control module 500. The second isolation module 400 is also used to receive a fault signal output by the target device 20 and output it to the control module 500. The control module 500 is connected to the output end of the second isolation module 400, and is used to determine that at least one of the first device 21 and the target device 20 has a fault when the fault signal is received.

[0031] It can be understood that the output end of the unidirectional conduction module 300 is used to connect the connected target device 20 and the input end of the second isolation module 400, so that the first device 21 can send the fault signal detected by itself to the connected target device 20, and can also receive the fault signal input by the target device 20. Through the above embodiment, whether the target device 20 or the first device 21 fails, the first device 21 and the target device 20 can obtain the fault information in time, so as to confirm that at least one device in the current multi-device system 30 has a fault, so as to perform the corresponding fault protection strategy, thereby improving the safety of the operation of the entire multi-device system 30. The first isolation module 200 and the second isolation module 400 can realize unidirectional transmission of signals while transmitting the fault signal, and isolate the fault current and fault voltage generated by the fault. The fault enable signal can be a signal sent by other self-test modules such as controllers and sensors in the first device 21. The control module 500 can control the corresponding functional module to stop working or perform corresponding emergency processing when it is determined that at least one device has a fault. Among them, the receiving module 100 and the control module 500 can be microcontrollers such as chips and single-chip microcomputers.

[0032] The unidirectional conduction module 300 can transmit the fault signal from the output end of the first isolation module 200 to the input end of the second isolation module 400, or to the connected target device 20, so as to prevent the fault signal from the target device 20 from affecting the operation of the receiving module 100. It can be understood that in the multi-device system 30, only one wire can be used to connect the devices, thereby achieving the purpose of saving the product cost of the multi-device system 30 and reducing the design difficulty.

[0033] In one embodiment, if Figure 2As shown, the target device includes the second device 22 as an example for description. That is, at this time, the multi-device system 30 includes the first device 21 and the second device 22. At this time, the fault protection circuit 10a of the first device 21 includes a receiving module 100a, a first isolation module 200a, a unidirectional conduction module 300a, a second isolation module 400a and a control module 500a, and also includes a first protection terminal 600a. The second device 22 also includes a fault protection circuit 10b, and its structure is the same as that of the fault protection circuit 10a, so the fault protection circuit 10a is mainly used for description.

[0034] The first protection terminal 600a in the fault protection circuit 10a is connected to the input end of the second isolation module 400a and the output end of the unidirectional conduction module 300a, and is used to connect to the first protection terminal 600b in the fault protection circuit 10b of the second device 22 through a wire.

[0035] The first protection terminal 600a, as an external module, may be a connector such as a signal interface, for realizing connection with a wire. The first protection terminal 600a may also be a power line transmission interface, for signal transmission through a power line. In this embodiment, the first protection terminal 600a may be a terminal capable of level transmission. The first protection terminal 600a of the first device 21 and the first protection terminal 600b of the second device 22 mutually transmit fault signals through a wire or a signal line.

[0036] In one embodiment, if Figure 3 As shown, the target device includes the second device 22 and the third device 23, that is, the multi-device system 30 includes the first device 21, the second device 22 and the third device 23. At this time, the fault protection circuit 10a includes a first protection terminal 600a and a second protection terminal 700a. Among them, the first protection terminal 600a is used to connect to the first protection terminal 600b of the second device 22 through a wire. The second protection terminal 700a is used to connect to the first protection terminal 600c of the third device 23 through a wire. Whether the second device 22 and the third device 23 include the second protection terminal can be determined according to their own definitions. For example, when the second device 22 is only configured with an access port for one target device, it only includes the first protection terminal 600b; when the third device 23 includes access ports for two target devices, it is also configured with the second protection terminal 700c like the first device 21. Therefore, the third device 23 can also access other target devices through the second protection terminal 700c, thereby forming a multi-device system 30. The number of devices cascaded in the multi-device system 30 can be set according to actual needs and is not limited to a specific number. In one embodiment, the second device 22 is a host, and the first device 21 and the third device 23 are slaves. The host and the slaves are connected in a cascade manner.

[0037] Since the first protection terminal 600a and the second protection terminal 700a of the first device 21 are both connected to the input end of the second isolation module 400a and the output end of the one-way conduction module 300a. Therefore, in the first device 21, the fault signal transmitted by the one-way conduction module 300a can be transmitted to the second device 22 through the first protection terminal 600a, can be transmitted to the third device 23 through the second protection terminal 700a, and can also be transmitted to its own control module 500a through the second isolation module 400a, so that each device in the multi-device system 30 can obtain the fault signal to perform corresponding fault protection, thereby improving the operating safety of the system. In addition, the first protection terminal 600a can also receive the fault signal output by the second device 22, and the second protection terminal 700a can receive the fault signal output by the third device 23, and then transmit it to its own control module 500a through the second isolation module 400a, so that when there is a fault in other devices, the corresponding protection operation can be performed in time according to the fault signal to ensure the safety of system operation. That is, in this embodiment, the transmission and reception of fault signals between devices can be transmitted through the same wire, which can effectively reduce the equipment cost. The fault signal generated by any device in the multi-device system 30 can be transmitted to each device in the system, realizing the rapid transmission of the fault signal and improving the stability and safety of the system operation.

[0038] Figure 4 for Figure 3 Specific circuit diagram of the embodiment shown. Since the circuit diagrams of the fault protection circuits in each device are the same, the second device 22 is used as an example to illustrate the circuits of each module in this embodiment. Specifically, the first isolation module 200b includes a control switch Q1, a first photocoupler U1, a first resistor R1 and a second resistor R2.

[0039] The positive electrode of the light emitter of the first photocoupler U1 is connected to the first working power supply through the first resistor R1. The negative electrode of the light emitter of the first photocoupler U1 is connected to the first end of the control switch Q1, the second end of the control switch Q1 is grounded, and the controlled end of the control switch Q1 is connected to the output end of the receiving module 100b. The first end of the optical receiver of the first photocoupler U1 is connected to the second working power supply through the second resistor R2. The second end of the optical receiver of the first photocoupler U1 is connected to the input end of the unidirectional conduction module 300b.

[0040] In this embodiment, the controlled end of the control switch Q1 is the input end of the first isolation module 200b, and the second end of the optical receiver of the first photocoupler U1 is the output end of the first isolation module 200b. The first working power supply can provide a first working voltage V1. The second working power supply can provide a second working voltage V2. The specific values ​​of the first working voltage V1 and the second working voltage V2 can be set according to actual needs.

[0041] It can be understood that when the receiving module 100b controls the switch Q1 to be disconnected, the first photocoupler U1 is in the cut-off state. When the receiving module 100b controls the switch Q1 to be turned on, the first photocoupler U1 is in the on state, and the first isolation module 200b outputs a fault signal to the unidirectional conduction module 300b. The first photocoupler U1 can realize the isolated transmission of the fault signal input by the receiving module 100b.

[0042] The second isolation module 400b includes a second photoelectric coupler U2. The positive pole of the light emitter of the second photoelectric coupler U2 is connected to the output end of the one-way conduction module 300b. The negative pole of the light emitter of the second photoelectric coupler U2 is grounded. The first end of the light receiver of the second photoelectric coupler U2 is connected to the signal input end of the control module 500b, and the second end of the light receiver of the second photoelectric coupler U2 is grounded. The positive pole of the light emitter of the second photoelectric coupler U2 is also connected to the first protection terminal 600b.

[0043] In this embodiment, the positive electrode of the light emitter of the second photocoupler U2 is the input end of the second isolation module 400b, and the first end of the light receiver of the second photocoupler U2 is the output end of the second isolation module 400b.

[0044] When the first photocoupler U1 or the photocoupler of the connected target device such as U3 is in the cut-off state, the second photocoupler U2 is also in the cut-off state. When the fault signal causes the first photocoupler U1 or the photocoupler of the connected target device such as U3 to be in the on state, the second photocoupler U2 is also in the on state, so that the fault signal can be output to the control module 500b.

[0045] In one embodiment, the control switch Q1 includes an N-type MOS transistor.

[0046] It can be understood that the drain of the N-type MOS transistor constitutes the first end of the control switch Q1 , the source of the N-type MOS transistor constitutes the second end of the control switch Q1 , and the gate of the N-type MOS transistor constitutes the controlled end of the control switch Q1 .

[0047] In one embodiment, the unidirectional conducting module 300 b includes a diode D1 .

[0048] It is understandable that the anode of the diode D1 is connected to the input end of the unidirectional conduction module 300b, and the cathode of the diode D1 is connected to the output end of the unidirectional conduction module 300b. The diode D1 can enable the fault signal to be transmitted unidirectionally from the first isolation module 200b to the second isolation module 400b. In one embodiment, two interconnected devices in the multi-device system 30 can also be connected through two wires, one of which is used to send the fault signal and the other is used to receive the fault signal, thereby realizing the separation of sending and receiving, and being able to send and receive the fault signal at the same time, ensuring that the fault signal can be transmitted in the first time. Figure 5 As shown, the target device includes the second device 22, that is, at this time, the multi-device system 30 includes the first device 21 and the second device 22. At this time, the fault protection circuit 10a in the first device 21 includes the first protection terminal Out1a and the second protection terminal In1a. The fault protection circuit 10b of the second device 22 includes the first protection terminal Out1b and the second protection terminal In1b.

[0049] The first protection terminal Out1a of the fault protection circuit 10a of the first device 21 is connected to the output end of the first isolation module 200a, and is used to be connected to the second protection terminal In1b in the fault protection circuit 10b of the second device 22 through a first wire. The second protection terminal In1a of the first device 21 is connected to the input end of the second isolation module 400a, and is used to be connected to the first protection terminal Out1b in the fault protection circuit 10b of the second device 22 through a second wire.

[0050] The fault signal output by the first isolation module 200a of the first device 21 can be directly transmitted to the second device 22 through the first protection terminal Out1a, and then transmitted to the control module 500b of the second device 22 through the second isolation module 400b in the second device 22, so that the control module 500b of the second device 22 can obtain the fault signal of the first device 21 and then perform corresponding fault protection. The fault signal output by the first isolation module 200a of the first device 21 can also be transmitted to the second isolation module 400a through the unidirectional conduction module 300a, and then transmitted to the control module 500a, so that the control module 500a can know its own fault signal and then perform corresponding fault protection.

[0051] The fault signal output by the first protection terminal Out1b of the second device 22 can be transmitted to the first device 21 through the second protection terminal In1a of the first device 21, and then transmitted to the control module 500a through the second isolation module 400a, so that the control module 500a can obtain the fault signal of the second device 22, thereby performing the corresponding protection operation corresponding to the fault signal, thereby realizing the mutual transmission of fault signals between the two devices.

[0052] like Figure 6 As shown, in one embodiment, the target device includes the second device 22 and the third device 23, that is, the multi-device system 30 includes the first device 21, the second device 22 and the third device 23. The fault protection circuit 10a of the first device 21 also includes a third protection terminal Out2a and a fourth protection terminal In2a.

[0053] The third protection terminal Out2a of the first device 21 is connected to the output end of the first isolation module 200a of the first device 21, and is used to be connected to the first protection terminal Out1c in the fault protection circuit 10c in the third device 23 through the third wire. The fourth protection terminal In2a of the first device 21 is connected to the input end of the second isolation module 400a of the first device 21, and is used to be connected to the second protection terminal In1c in the fault protection circuit 10c in the third device 23 through the fourth wire.

[0054] The first protection terminal Out1a of the fault protection circuit 10a of the first device 21 is connected to the output end of the first isolation module 200a, and is used to be connected to the second protection terminal In1a in the fault protection circuit 10b of the second device 22 through a first wire. The second protection terminal In1a of the first device 21 is connected to the input end of the second isolation module 400a, and is used to be connected to the first protection terminal Out1b in the fault protection circuit 10b of the second device 22 through a second wire.

[0055] In this embodiment, the third protection terminal Out2a and the first protection terminal Out1a are both connected to the output end of the first isolation module 200, and the fourth protection terminal In2a and the second protection terminal In1a are both connected to the input end of the second isolation module 400a.

[0056] When the fault signal output by the third device 23 is transmitted to the third protection terminal Out2a of the first device 21 through the first protection terminal Out1c, the fault signal can be transmitted to the control module 500a through the unidirectional conduction module 300a and the second isolation module 400a; since the third protection terminal Out2a is connected to the first protection terminal Out1a, the fault signal can also be directly output from the first protection terminal Out1a of the first device 21 to the second device 22, thereby passing through the second isolation module 400b of the second device 22 to the control module 500b, so as to realize the transmission of the fault signal of the third device 23 to the first device 21 and the second device 22. Similarly, the fault signal of the third device 23 can also pass through its own unidirectional conduction module 300c and the second isolation module 400c to the control module 500c, so as to be detected by its own control module 500c to perform corresponding fault protection operations.

[0057] Similarly, when the second device 22 outputs a fault signal through the first protection terminal Out1b, the fault signal can be transmitted to the second isolation module 400a and then to the control module 500a through the second protection terminal In1a of the first device 21. And because the second protection terminal In1a is connected to the fourth protection terminal In2a, the fault signal can also be transmitted to the second protection terminal In1c of the third device 23 through the fourth protection terminal In2a, and then the fault signal passes through the second isolation module 400c of the third device 23 to the control module 500c. Therefore, through the above embodiment, the mutual transmission of fault signals between the devices in the multi-device system 30 can be achieved, thereby ensuring that when any device fails, each device in the system can detect the fault signal and then perform corresponding fault protection operations, thereby improving the stability of system operation.

[0058] It is understandable that each target device may include a first protection terminal and a second protection terminal, and whether to include a third protection terminal and a fourth protection terminal needs to be determined according to the number of other target devices to which it is connected. For example, when the second device 22 has only one access port, only the first protection terminal and the second protection terminal need to be set. When the third device 23 includes two access ports, the third protection terminal and the fourth protection terminal need to be set to connect to other target devices, thereby realizing the connection of more devices.

[0059] Figure 7 for Figure 6 The specific circuit diagram of the embodiment shown in FIG. Figure 4 As shown in the figure, the main difference is that the original transmission and reception shared one wire is changed to two separate transmission and reception wires, so Figure 7 No further introduction.

[0060] Figure 8 A schematic diagram of the structure of an electronic device provided by an embodiment of the present application is shown. For the sake of convenience, only the parts related to the present embodiment are shown, which are described in detail as follows:

[0061] The electronic device 40 comprises a housing and a fault protection circuit 10 as in any of the above embodiments, wherein the fault protection circuit 10 is arranged in the housing. The electronic device 40 comprises at least one first protection terminal 600 for connecting with other electronic devices 40 .

[0062] In one embodiment, the electronic device 40 may be a power supply device or a power conversion device. For example, the electronic device may be an energy storage device, and the electronic device 40 includes a power module and an energy storage module. The power module is used to convert the voltage in the energy storage module and discharge it to the outside, or to convert the external power supply and charge the energy storage module. The fault protection circuit 10 is connected to at least one of the power module and the energy storage module, and the control module 500 of the fault protection circuit 10 controls the power module to stop working and / or controls the energy storage module to stop outputting when receiving a fault signal.

[0063] Fig. 9 A schematic diagram of the structure of an energy storage system provided by an embodiment of the present application is shown. For the sake of convenience, only the parts related to the present embodiment are shown, which are described in detail as follows:

[0064] The energy storage system 50 may include multiple energy storage devices. Multiple energy storage devices may all include power modules and energy storage modules, that is, there is no distinction between master and slave machines, and the master and slave machines are determined by arbitration after parallel connection. In other embodiments, multiple energy storage devices may also be divided into master and slave machines. The master includes a power module and an energy storage module. The slave may only include an energy storage module. Each energy storage device includes the fault protection circuit mentioned in any of the above embodiments, so as to ensure that when any energy storage device generates a fault signal, it can be detected by other devices, and then the corresponding fault protection operation is performed to improve the stability and safety of the system operation.

[0065] exist Fig. 9 In the energy storage system 50 shown, the multiple electronic devices only show the first energy storage device 41, the second energy storage device 42 and the third energy storage device 43. In other embodiments, the number of energy storage devices can also be set as needed, and is not limited to the current embodiment.

[0066] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0067] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0068] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A fault protection circuit, characterized in that: applied to a first device; The first device is also used to connect to at least one target device; The fault protection circuit comprises: A receiving module, used for receiving a fault enable signal and outputting it to a first isolation module; The first isolation module, the input end of the first isolation module is connected to the output end of the receiving module, and the first isolation module is used to output a fault signal according to the fault enable signal; A unidirectional conduction module, the input end of which is connected to the output end of the first isolation module, and the unidirectional conduction module is used to unidirectionally transmit the fault signal to the second isolation module or the connected target device; The second isolation module, the input end of the second isolation module is connected to the output end of the one-way conduction module and at least one of the target devices, the second isolation module is used to receive the fault signal from the one-way conduction module and output it to the control module; the second isolation module is also used to receive the fault signal output by the target device; The control module is connected to the output end of the second isolation module and is used to determine that at least one of the first device and the target device has a fault when the fault signal is received.

2. The fault protection circuit according to claim 1, characterized in that: The target device includes a second device; the fault protection circuit also includes a first protection terminal, which is connected to the input end of the second isolation module and is used to be connected to the first protection terminal in the fault protection circuit of the second device through a wire.

3. The fault protection circuit according to claim 2, characterized in that: The target device also includes a third device; the fault protection circuit also includes a second protection terminal; the second protection terminal is connected to the input end of the second isolation module and is used to connect to the first protection terminal in the fault protection circuit of the third device through a wire.

4. The fault protection circuit according to claim 1, characterized in that: The target device includes a second device; the fault protection circuit also includes a first protection terminal and a second protection terminal; The first protection terminal is connected to the output end of the first isolation module and is used to be connected to the second protection terminal in the fault protection circuit of the second device through a first wire; The second protection terminal is connected to the input end of the second isolation module and is used to be connected to the first protection terminal in the fault protection circuit of the second device through a second wire.

5. The fault protection circuit according to claim 4, characterized in that: The target device further includes a third device; the fault protection circuit further includes a third protection terminal and a fourth protection terminal; The third protection terminal is connected to the output end of the first isolation module and is used to be connected to the first protection terminal in the fault protection circuit in the third device through a third wire; The fourth protection terminal is connected to the input end of the second isolation module, and is used to be connected to the second protection terminal in the fault protection circuit of the third device through a fourth wire.

6. The fault protection circuit according to any one of claims 1 to 5, characterized in that: The first isolation module includes a control switch, a first photocoupler, a first resistor and a second resistor; The positive electrode of the light emitter of the first photoelectric coupler is connected to the first working power supply through the first resistor, the negative electrode of the light emitter of the first photoelectric coupler is connected to the first end of the control switch, the second end of the control switch is grounded, and the controlled end of the control switch is connected to the output end of the receiving module; The first end of the optical receiver of the first photoelectric coupler is connected to the second working power supply through the second resistor, and the second end of the optical receiver of the first photoelectric coupler is connected to the input end of the unidirectional conduction module.

7. The fault protection circuit according to any one of claims 1 to 5, characterized in that: The second isolation module includes a second photoelectric coupler; The positive pole of the light emitter of the second photoelectric coupler is connected to the output end of the unidirectional conduction module, the negative pole of the light emitter of the second photoelectric coupler is grounded, the first end of the light receiver of the second photoelectric coupler is connected to the control module, and the second end of the light receiver of the second photoelectric coupler is grounded.

8. The fault protection circuit according to any one of claims 1 to 3, characterized in that: The one-way conducting module comprises a diode, an anode of the diode is connected to an input end of the one-way conducting module, and a cathode of the diode is connected to an output end of the one-way conducting module.

9. An electronic device, characterized in that: The electronic device comprises the fault protection circuit according to any one of claims 1 to 8.

10. An energy storage system, characterized in that: The device comprises a plurality of electronic devices as claimed in claim 9 which are connected to each other.

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