Control circuit

Abstract

The embodiment of the utility model provides a control circuit, the circuit comprises an energy management system, a control unit, a relay and a power supply circuit, the energy management system is connected with the control unit and the relay, and is used for detecting a first communication state with the control unit; under the condition that the first communication state indicates that the energy management system and the control unit are in an abnormal communication state, detecting a first power-on state of the control unit, and outputting a control signal according to the first power-on state; the relay is connected with the control unit and the power supply circuit and is used for receiving the control signal and controlling the on-off of the relay according to the control signal; and the power supply circuit is used for inputting voltage to the control unit according to the on-off of the relay.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of circuit, in particular, to a control circuit. BACKGROUND

[0002] In the current field of energy storage technology, the module battery control unit (MBCU) as a key component in the energy storage system, undertakes the important responsibility of monitoring and managing the state of the battery module. However, in actual operation, MBCU may encounter software failure or downtime, which poses a challenge to the continuous operation and efficiency of the system. When MBCU encounters such problems, the traditional method is to manually disconnect and reconnect the power supply of MBCU to try to restore its normal function. Specifically, the operator needs to reach the scene, manually disconnect the MBCU power switch in the busbar cabinet, wait for a period of time, and then manually close the switch to achieve the effect of resetting.

[0003] This recovery process not only consumes time and effort, reduces the response speed and overall efficiency of the system, but also has certain safety risks and operation errors due to the need for manual intervention. More importantly, such manual operation mode cannot meet the demand of modern energy storage systems for remote management and automated operation, limiting the scalability and intelligent level of the system.

[0004] In view of the problem in the prior art that the traditional manual power-off reset operation is inconvenient when the module battery control unit (MBCU) runs and software failure or downtime occurs, and affects the efficiency of the system, no effective solution has been proposed so far.

[0005] Therefore, it is necessary to improve the related technology to overcome the defects in the related technology. CONTENT OF THE INVENTION

[0006] The embodiments of the present application provide a control circuit to at least solve the problem in the prior art that the traditional manual power-off reset operation is inconvenient when the module battery control unit (MBCU) runs and software failure or downtime occurs, and affects the efficiency of the system.

[0007] According to one embodiment of the present application, a control circuit is provided, comprising: an energy management system, a control unit, a relay and a power supply circuit, wherein the energy management system is connected with the control unit, the relay and the power supply circuit, and is configured to detect a first communication state of the control unit; in a case where the first communication state indicates that the energy management system and the control unit are in an abnormal communication state, detect a first power-on state of the control unit, and output a control signal according to the first power-on state; the relay is connected with the control unit and the power supply circuit, and is configured to receive the control signal, and control on-off of the relay according to the control signal; and the power supply circuit is configured to input a voltage to the control unit according to the on-off of the relay.

[0008] In one example embodiment, the power supply circuit comprises: a power supply unit and a power supply micro-break switch connected with the power supply unit, wherein the power supply unit is configured to input a voltage to the control unit according to the on-off of the relay; and the power supply micro-break switch is configured to adjust an on-off state of the power supply micro-break switch according to a working state of the power supply unit.

[0009] In one example embodiment, the power supply micro-break switch comprises: a first normally open contact and an auxiliary normally open contact, wherein a first pin of the first normally open contact is connected with a positive electrode of the power supply unit, and a second pin of the first normally open contact is connected with a first pin of a normally closed contact of the relay; a first pin of the auxiliary normally open contact is connected with a second normally open contact of the power supply unit, and a second pin of the auxiliary normally open contact is connected with an input pin of the energy management system.

[0010] In one example embodiment, the first normally open contact is configured to adjust the on-off state of the first normally open contact to a closed state in a case where the working state of the power supply unit is a normal working state; and the first normally open contact is configured to adjust the on-off state of the first normally open contact to an open state in a case where the working state of the power supply unit is an abnormal working state.

[0011] In one example embodiment, the auxiliary normally open contact is configured to adjust the on-off state of the auxiliary normally open contact to a closed state in a case where the working state of the power supply unit is a normal working state; and the auxiliary normally open contact is configured to adjust the on-off state of the auxiliary normally open contact to an open state in a case where the working state of the power supply unit is an abnormal working state.

[0012] In one example embodiment, the energy management system is further configured to receive a first level signal when the auxiliary normally open contact is in a closed state, and determine a first power-on state of the control unit as a normal power-on state according to the first level signal; receive a second level signal when the auxiliary normally open contact is in an open state, and determine the first power-on state of the control unit as an abnormal power-on state according to the second level signal.

[0013] In one example embodiment, the relay includes an electromagnet and a normally closed contact, wherein a first end of a coil of the electromagnet is connected to a first output pin of the energy management system, and a second end of the coil is connected to a second output pin of the energy management system; a first pin of the normally closed contact is connected to a second pin of a first normally open contact in the power supply circuit, and a second pin of the normally closed contact is connected to a positive electrode of the control unit.

[0014] In one example embodiment, the electromagnet is configured to generate a magnetic field when the energy management system outputs a control signal to the coil; and the normally closed contact is configured to control the normally closed contact to be open when the electromagnet generates the magnetic field.

[0015] In one example embodiment, the energy management system is further configured to output the control signal for a preset time period when the first power-on state of the control unit is a normal power-on state; and disable output of the control signal when the first power-on state of the control unit is an abnormal power-on state.

[0016] In one example embodiment, the energy management system is further configured to detect a second communication state with the control unit after continuously outputting the control signal for a preset time period; continuously output the control signal for the preset time period again when the second communication state indicates that the energy management system and the control unit are in an abnormal communication state; and disable output of the control signal when the second communication state indicates that the energy management system and the control unit are in a normal communication state.

[0017] By the control circuit of the present application, wherein the energy management system is configured to detect a first communication state of the control unit; in the case that the first communication state indicates that the energy management system is in an abnormal communication state with the control unit, detect a first power-on state of the control unit and output a control signal according to the first power-on state; the relay is configured to receive the control signal and control the on-off of the relay according to the control signal; and the power supply circuit is configured to input a voltage to the control unit according to the on-off of the relay. By the above-mentioned control circuit, remote automatic power-on and power-off self-recovery of the control unit (MBCU) can be realized, without manual intervention, thereby improving the automation degree and operation reliability of the system, and thus the problem that manual power-off reset operation is inconvenient and affects the system operation efficiency when software failure or downtime occurs during operation of the module battery control unit can be solved. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced here. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without creative labor.

[0020] Figure 1 is a circuit diagram of a control circuit according to an embodiment of the present application (one);

[0021] Figure 2 is a circuit diagram of a control circuit according to an embodiment of the present application (two);

[0022] Figure 3 is a circuit diagram of a control circuit according to an embodiment of the present application (three). DETAILED DESCRIPTION

[0023] Hereinafter, the embodiments of the present application will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence.

[0025] In the present embodiment, a control circuit is provided, Figure 1 is a circuit diagram of a control circuit according to an embodiment of the present application (one), as Figure 1 shown, the circuit comprises the following:

[0026] An energy management system 12, a control unit 14, a relay 16 and a power supply circuit 18, wherein,

[0027] The energy management system 12, connected with the control unit 14, the relay 16 and the power supply circuit 18, is configured to detect a first communication state of the control unit 14; in the case that the first communication state indicates that the energy management system 12 and the control unit 14 are in an abnormal communication state, detect a first power-on state of the control unit 14, and output a control signal according to the first power-on state;

[0028] It should be noted that the energy management system (EMS) is configured to detect the communication state (first communication state) of the control unit (MBCU), and if it is detected that the communication is abnormal (i.e., abnormal communication state), the EMS further detects the power-on state (first power-on state) of the MBCU. According to the detected power-on state, the EMS decides whether to output a control signal.

[0029] The control unit is connected with the EMS, the relay and the power supply circuit, and is responsible for real-time monitoring and control of the battery module. When the communication state of the MBCU is abnormal and the power-on state is normal, the control unit triggers the subsequent self-recovery process based on the control signal sent by the EMS.

[0030] The relay 16 is connected with the control unit 14 and the power supply circuit 18, and is configured to receive the control signal and control the on-off of the relay 16 according to the control signal;

[0031] The relay receives the control signal from the EMS, and controls the on-off state of itself according to the instruction of the signal, thereby indirectly controlling the power input of the MBCU. When receiving the disconnection signal from the EMS, the normally closed contact of the relay is disconnected, cutting off the power supply of the MBCU; when receiving the closing signal, the normally closed contact of the relay is closed, restoring the power supply of the MBCU.

[0032] The power supply circuit 18 is configured to input voltage to the control unit 14 according to the on-off of the relay 16.

[0033] The power supply circuit is configured to provide or cut off the working voltage to the MBCU according to the on-off state of the relay. When the relay contact is closed, the power supply circuit inputs the working voltage to the MBCU; when the relay contact is disconnected, the power supply circuit stops supplying power to the MBCU.

[0034] It should be noted that the above-mentioned energy management system 12 corresponds to the EMS1 in Figure 2 , the control unit 14 corresponds to the MBCU2 in Figure 2 , and the relay 16 corresponds toFigure 2 The power supply control relay 3 and the power supply circuit 18 in the MBCU power supply control circuit 2 correspond to Figure 2 The MBCU power supply module 4 and the MBCU power supply micro switch 5 in the MBCU power supply control circuit 2 correspond to

[0035] Through the above-mentioned circuit, the energy management system is used for detecting a first communication state of the control unit; in the case that the first communication state indicates that the energy management system and the control unit are in an abnormal communication state, a first power-on state of the control unit is detected, and a control signal is output according to the first power-on state; the relay receives the control signal, and controls the on-off of the relay according to the control signal; and the power supply circuit is used for inputting a voltage to the control unit according to the on-off of the relay. Through the setting of the above-mentioned control circuit, remote automatic power-on and power-off self-recovery of the control unit (MBCU) can be realized, without manual intervention, and the automation degree and operation reliability of the system are improved, so that the problem that traditional manual power-off reset operation is inconvenient and affects the system operation efficiency when a software failure or downtime occurs during the operation of the module battery control unit can be solved.

[0036] Optionally, the power supply circuit comprises a power supply unit and a power supply micro switch connected to the power supply unit, wherein the power supply unit is used for inputting a voltage to the control unit according to the on-off of the relay; and the power supply micro switch is used for adjusting the on-off state of the power supply micro switch according to the working state of the power supply unit.

[0037] In the embodiment of the present application, the power supply circuit comprises two main components: a power supply unit and a power supply micro switch, wherein the power supply unit provides a stable voltage input for the MBCU. When the EMS detects that the MBCU is in a software failure or downtime state, and at this time the MBCU is still in a power-on state, the EMS will control the power supply state of the power supply unit through the relay in the control circuit. If the relay receives the power-off control signal of the EMS, it will disconnect the connection with the power supply unit, so that the power supply unit stops supplying power to the MBCU. Conversely, when the EMS needs to restore the power supply of the MBCU, the relay will be closed again according to the control signal, so that the power supply unit restores the power supply to the MBCU.

[0038] The power micro-break switch is a protection device capable of quickly cutting off and reconnecting the circuit, which is connected with the power supply unit and used for adjusting the on-off state of the power micro-break switch according to the working state of the power supply unit. The power micro-break switch has the functions of overload protection, short circuit protection and the like, and can effectively prevent the MBCU from being damaged or the system from failing due to abnormal power supply. The power micro-break switch adjusts the on-off state of the power micro-break switch based on the working state of the power module, for example, in the case of normal working of the power module, the working state of the power micro-break switch is in the closed state, and in the case of abnormal working of the power module, the working state of the power micro-break switch is in the open state.

[0039] Through the combination of the power supply unit and the power micro-break switch, the power supply circuit realizes intelligent and dynamic management of the MBCU power supply, ensures that the MBCU can automatically recover by EMS remote automatic control when encountering software failure or downtime and the like, and does not need manual intervention, thereby improving the automation level and operation efficiency of the energy storage system.

[0040] It should be noted that the power supply unit corresponds to the MBCU power module 4 in Figure 2 , and the power micro-break switch corresponds to the MBCU power micro-break switch 5 in Figure 2 .

[0041] Optionally, the power micro-break switch comprises a first normally open contact and an auxiliary normally open contact, wherein a first pin of the first normally open contact is connected with a positive electrode of the power supply unit, and a second pin of the first normally open contact is connected with a first pin of a normally closed contact of the relay; a first pin of the auxiliary normally open contact is connected with a second normally open contact of the power supply unit, and a second pin of the auxiliary normally open contact is connected with an input pin of the energy management system.

[0042] In the embodiment of the present application, the power micro-break switch comprises two contacts: a first normally open contact and an auxiliary normally open contact.

[0043] The first pin of the first normally open contact is connected with the positive electrode of the power supply unit, which is the starting point of the power supply. The second pin is connected with the second pin of the normally closed contact of the relay, forming a path for MBCU power control.

[0044] In the normal working state, the first normally open contact is in the closed state, allowing current to flow from the positive electrode of the power supply unit to the relay, and then to the MBCU, ensuring normal power supply of the MBCU. When the EMS detects abnormal operation of the MBCU and needs to be powered off, the EMS will disconnect the normally closed contact of the relay through the control circuit, thereby cutting off the circuit between the first normally open contact and the MBCU, realizing power-off operation. When power supply needs to be restored, the EMS re-closes the normally closed contact of the relay, the circuit is restored to conduction, and the MBCU regains power supply.

[0045] The first pin of the auxiliary normally open contact is connected with the second normally open contact of the power supply unit, and the second pin is connected with the input pin of the energy management system, for feeding back the power supply state information of the MBCU to the EMS.

[0046] The auxiliary normally open contact serves as an indicator of the power supply state. When the MBCU is normally powered, the auxiliary normally open contact is also in a closed state, sending a normal power signal to the EMS. Conversely, when the MBCU is powered off, the auxiliary normally open contact is open, and the EMS cannot receive the normal power signal, thereby determining the power supply state of the MBCU. Through the above connection mode, the EMS can monitor the power supply state of the MBCU in real time.

[0047] It should be noted that the first pin of the first normally open contact corresponds to pin 1 in the MBCU power micro switch in Figure 3 , the second pin of the first normally open contact corresponds to pin 2 in the MBCU power micro switch in Figure 3 , the first pin of the auxiliary normally open contact corresponds to pin C in the MBCU power micro switch in Figure 3 , the second pin of the auxiliary normally open contact corresponds to pin NO in the MBCU power micro switch in Figure 3 , the second normally open contact of the power supply unit corresponds to the normally open contact composed of pin 5 and pin 6 in the MBCU power module in Figure 3 , and the input pin of the energy management system corresponds to pin DI 1 in the EMS in Figure 3 . Figure 3 The positive electrode of the power supply unit corresponds to pin TB2-1 in the MBCU power module in Figure 3 , and the first pin of the normally closed contact of the relay corresponds to pin 1 of the MBCU power control relay in

[0048] The power micro switch, through the cooperation of the first normally open contact and the auxiliary normally open contact, not only can realize the precise control of the MBCU power supply, but also can feed back the power supply state of the MBCU to the EMS, ensuring the automatic operation and fault self-recovery capability of the entire energy storage system. Further, the intelligent level of the system is improved, the need for manual operation is reduced, the safety of operation is improved, and the overall reliability of the system is improved.

[0049] Optionally, in the embodiment of the present application, the working mechanism of the first normally open contact is given, including: the first normally open contact, for adjusting the on-off state of the first normally open contact to a closed state when the working state of the power supply unit is a normal working state; the first normally open contact, for adjusting the on-off state of the first normally open contact to an open state when the working state of the power supply unit is an abnormal working state.

[0050] The first normally open contact controls the power supply of the MBCU. When the power unit is in a normal working state, i.e., it can stably provide the required voltage and current, the first normally open contact is adjusted to a closed state, allowing the positive pole of the power unit to be directly connected to the normally closed contact of the relay, thereby forming a complete power supply path, ensuring the power supply required for the normal operation of the MBCU. In this state, the MBCU can continuously receive and process the power provided by the power unit, performing its monitoring and management tasks for the battery module.

[0051] When the working state of the power unit changes to an abnormal state, such as overload, short circuit, or failure to provide a stable voltage, the first normally open contact will be adjusted to an open state. The open state contact cuts off the connection between the power unit and the relay, and further cuts off the power supply of the MBCU.

[0052] Optionally, in the embodiments of the present application, the working mechanism of the auxiliary normally open contact is given, including: adjusting the on-off state of the auxiliary normally open contact to a closed state when the working state of the power unit is in a normal working state; the auxiliary normally open contact is used to adjust the on-off state of the auxiliary normally open contact to an open state when the working state of the power unit is in an abnormal working state.

[0053] The auxiliary normally open contact adjusts its closed or open state in conjunction with the working state of the power unit, thereby reporting the power supply situation of the MBCU (Module Battery Control Unit) to the Energy Management System (EMS). Further, it ensures that the EMS can timely and accurately understand the power state of the MBCU.

[0054] When the power unit can stably output the voltage and current required by the MBCU, the auxiliary normally open contact will be adjusted to a closed state. The closed state auxiliary normally open contact transmits the signal of the power unit to the EMS, indicating that the current power supply of the MBCU is normal.

[0055] If the working state of the power unit is abnormal, such as voltage fluctuation exceeding the normal range, current overload or short circuit, etc., the auxiliary normally open contact will be adjusted to an open state. The open state auxiliary normally open contact prevents the signal of the power unit from being transmitted to the EMS, indicating that the power supply state of the MBCU is abnormal.

[0056] The auxiliary normally open contact provides real-time feedback of the power supply state of the MBCU to the EMS by adjusting its on-off state.

[0057] Optionally, the energy management system is further configured to receive a first level signal when the auxiliary normally open contact is in a closed state, and determine that the first power-on state of the control unit is a normal power-on state according to the first level signal; receive a second level signal when the auxiliary normally open contact is in an open state, and determine that the first power-on state of the control unit is an abnormal power-on state according to the second level signal.

[0058] In the embodiments of the present application, when the auxiliary normally open contact is in a closed state, it indicates that the working state of the power supply unit is a normal working state, and the power supply of the MBCU has no problem. At this time, the EMS receives a first level signal (for example, a high level signal) from the connection between the auxiliary normally open contact and the power supply unit. The EMS confirms that the MBCU is in a normal power-on state by detecting the high level signal.

[0059] On the contrary, if the auxiliary normally open contact is adjusted to an open state, it usually indicates that the working state of the power supply unit is abnormal, and the power supply of the MBCU may be interrupted or have a security risk. In this case, the EMS receives a second level signal (for example, a low level signal) or no level signal. By analyzing the low level signal, the EMS can determine that the first power-on state of the MBCU is an abnormal power-on state, which means that the MBCU may not receive power or the power state is unstable, and cannot guarantee its normal operation.

[0060] Based on the above signal processing and state determination mechanism, the EMS can intelligently make decisions according to the power-on state of the MBCU. If the MBCU is in an abnormal communication state but a normal power-on state (i.e., the auxiliary normally open contact is closed, and a first level signal is received), the EMS will perform a remote power-on and power-off self-recovery operation to try to restore its normal operation by controlling the relay to disconnect and reconnect the power supply of the MBCU. If the MBCU is in an abnormal communication state and an abnormal power-on state (the auxiliary normally open contact is open, and a second level signal is received), the EMS will trigger an alarm mechanism to prompt manual intervention for further troubleshooting and processing.

[0061] Optionally, the relay includes an electromagnet and a normally closed contact, wherein a first end of a coil of the electromagnet is connected to a first output pin of the energy management system, a second end of the coil is connected to a second output pin of the energy management system, a first pin of the normally closed contact is connected to a second pin of a first normally open contact in the power supply circuit, and a second pin of the normally closed contact is connected to a positive electrode of the control unit.

[0062] The first end of the coil of the electromagnet is connected to the first output pin of the energy management system (EMS), and the second end is connected to the second output pin of the EMS, forming a current loop. When the EMS needs to remotely operate the power supply of the MBCU, the coil of the relay is powered through the two output pins, generating an electromagnetic field.

[0063] After the coil is powered on, the electromagnet generates a magnetic force to attract or push the mechanical mechanism (usually an iron core or armature) inside it, thereby changing the state of the contacts in the relay. In the energy storage system, when the EMS detects that the MBCU needs to be powered off or re-powered, the control of the coil is controlled, and the magnetic force of the electromagnet is used to realize the switching operation of the contacts.

[0064] The normally closed contact remains closed when the relay is not excited. That is, under normal working conditions, the power supply path of the MBCU is unobstructed, and the power supply circuit can continuously supply power to the MBCU.

[0065] The first pin of the normally closed contact is connected to the second pin of the first normally open contact in the power supply circuit, and the second pin is connected to the positive electrode of the MBCU, forming the power supply control path of the MBCU. Further, when the EMS disconnects or closes the normally closed contact by controlling the state of the electromagnet, the power supply of the MBCU also changes accordingly. In the case of power-off, the EMS powers on the coil, the electromagnet generates a magnetic field, and the normally closed contact is disconnected, cutting off the power input of the MBCU. When power needs to be restored, the EMS controls the coil to be powered off, the magnetic field disappears, and the normally closed contact is re-closed under the action of the spring, the power supply path of the MBCU is established again, and remote power restoration is realized.

[0066] It should be noted that the first end of the coil of the electromagnet corresponds to pin 14 in the MBCU power control relay in Figure 3 , the first output pin of the energy management system corresponds to pin DO1+ in the EMS in Figure 3 , the second end of the coil corresponds to pin 13 in the MBCU power control relay in Figure 3 , and the second output pin of the energy management system corresponds to pin DO1- in the EMS in Figure 3 ; the first pin of the normally closed contact corresponds to pin 1 in the power control relay in Figure 3 , the second pin of the first normally open contact in the power supply circuit corresponds to pin 2 in the MBCU power micro-disconnection switch in Figure 3 , and the second pin of the normally closed contact corresponds to pin 9 in the power control relay in Figure 3 , and the positive electrode of the control unit corresponds to V+ in the MBCU in Figure 3 .

[0067] Through the above embodiment, the electromagnet generates a magnetic field through the on-off of the coil, and then controls the switch of the normally closed contact, thereby realizing remote management of the MBCU power supply. That is, the embodiment of the application can not only ensure that the EMS can automatically perform power-off and power-on operations when the MBCU has a software failure or a downtime problem, thereby avoiding the inconvenience of manual intervention, but also improve the automation level and operation efficiency of the energy storage system, and meanwhile, through the protection of the relay, the safety and reliability of the system are enhanced.

[0068] Optionally, the electromagnet is configured to generate a magnetic field when the energy management system outputs a control signal to the coil; and the normally closed contact is configured to control the normally closed contact to be disconnected when the electromagnet generates the magnetic field.

[0069] In the embodiment of the application, when the energy management system decides to perform power-off or power-on operations on the MBCU, it outputs a control signal to the coil of the electromagnet. The control signal is usually a voltage or a current, and once the coil receives the signal, the internal electromagnet starts to generate a magnetic field, wherein the magnetic field strength of the electromagnet is proportional to the size of the current in the coil.

[0070] The normally closed contact is in a closed state under normal circumstances, that is, when the electromagnet does not generate a magnetic field. At this time, the power supply path of the MBCU is unobstructed, and the MBCU can normally receive the power supply. However, when the electromagnet generates a magnetic field under the control of the EMS, the magnetic field acts on the mechanical part of the normally closed contact, which is usually an iron core that can be attracted or repelled by the magnetic force. The generation of the magnetic field causes the iron core to move, thereby causing the normally closed contact to be disconnected, and cutting off the power supply path of the MBCU.

[0071] That is, when the EMS detects an abnormal state (such as a software failure or a downtime) of the MBCU and decides to perform a power-off operation, it sends a control signal to the relay coil, and the electromagnet immediately generates a magnetic field. The force of the magnetic field causes the normally closed contact to be disconnected, cutting off the power input of the MBCU, thereby realizing remote power-off. When the MBCU needs to be powered on again, the EMS stops sending the control signal to the coil, the magnetic field of the electromagnet disappears, and the normally closed contact is re-closed under the action of the spring, thereby restoring the power supply of the MBCU and realizing remote power-on.

[0072] In the embodiment of the application, the electromagnet and the normally closed contact work cooperatively through the control signal of the EMS, and can remotely and accurately control the power-on and power-off of the MBCU, thereby ensuring the automatic operation of the system and enhancing the fault self-recovery capability.

[0073] Optionally, the energy management system is further configured to output the control signal within a preset time period when the first power-on state of the control unit is a normal power-on state, and to prohibit output of the control signal when the first power-on state of the control unit is an abnormal power-on state.

[0074] When the first power-on state of the control unit is the normal power-on state, the EMS confirms that the MBCU is receiving normal power supply by continuously monitoring the state of the auxiliary always-on contact. If the MBCU is in an abnormal communication state such as software failure or shutdown, but its power supply is normal (i.e. the auxiliary always-on contact is closed, receiving the first level signal), the EMS will determine that the first power-on state of the MBCU is the normal power-on state. At this time, the EMS can output a control signal within a preset time period to trigger the action of the relay, thereby disconnecting the power supply of the MBCU, trying to restore the normal operation of the MBCU by power-off and power-on. The preset time period is set to avoid frequent output of the control signal and reduce unnecessary power-off impact on the MBCU, while giving the MBCU enough time to respond and recover.

[0075] Optionally, the energy management system is further configured to detect a second communication state with the control unit after continuously outputting the control signal within the preset time period; continuously output the control signal again within the preset time period if the second communication state indicates that the energy management system and the control unit are in an abnormal communication state; and prohibit output of the control signal if the second communication state indicates that the energy management system and the control unit are in a normal communication state.

[0076] After the end of the preset time period, the EMS will suspend the output of the control signal and immediately detect the second communication state with the MBCU, i.e. try to establish communication with the MBCU again to see if the response of the MBCU can be successfully received, and then evaluate whether the power-off self-recovery operation is effective.

[0077] If the second communication state indicates that the EMS and the MBCU are still in an abnormal communication state, i.e. the MBCU fails to automatically restore normal communication with the EMS after power-off, the EMS will consider that a single power-off operation has failed to solve the problem. Therefore, the EMS will continuously output the control signal again within a preset time period to try to perform a second or multiple power-off self-recovery operations until a preset operation number or time limit is reached.

[0078] On the contrary, if the second communication state indicates that the EMS and the MBCU have successfully established normal communication, it means that the power-off self-recovery operation has restored the MBCU to normal operation. At this time, the EMS will immediately stop outputting the control signal to prevent unnecessary power supply operation from affecting the MBCU, while also avoiding energy waste.

[0079] In this embodiment, the EMS attempts a power outage self-recovery operation by continuously outputting control signals for a preset time period, and then immediately detects the second communication status, deciding whether to continue outputting control signals based on whether the MBCU has resumed normal communication. This mechanism provides an efficient and safe automatic recovery solution when dealing with MBCU software failures or downtime, reducing the need for manual intervention and enhancing the overall operating efficiency and stability of the energy storage system.

[0080] Furthermore, this application provides a control method for a control unit, which specifically includes the following:

[0081] Step 1: When the EMS detects an interruption in the communication signal with the MBCU, it determines whether the power input status of the MBCU can be detected.

[0082] Step 2: If the test results show that the power input of MBCU is normal, EMS will output power-on / off control signals.

[0083] It should be noted that the EMS outputs power-on / off control signals, such as... ​ As shown, when the MBCU power control relay coil is energized, the relay is triggered, and the normally closed contacts 1 and 9 of the relay open, the MBCU input power is disconnected, and after a set delay, the EMS stops outputting power-on / off control signals. The MBCU power control relay coil is de-energized, and the normally closed contacts 1 and 9 of the relay close, the MBCU input power is turned on, and the EMS completes one remote control MBCU power-on / off self-recovery cycle.

[0084] Step 3: The EMS completed a remote power-on / off self-recovery process and attempted to re-establish communication with the MBCU.

[0085] After the self-recovery operation, if the EMS still cannot establish communication with the MBCU, the system will repeat the above process, but the number of repetitions is limited by the EMS program settings. If communication between the EMS and the MBCU is still not restored after the preset number of repetitions, the system will trigger an alarm mechanism, output alarm information, and simultaneously escalate the alarm level, instructing manual intervention for troubleshooting and handling.

[0086] Step 4: If the test results show that the power input of MBCU is abnormal, or if EMS repeats the above process a preset number of times, EMS will not take any power-on or power-off control operations.

[0087] Specific examples in this embodiment can be found in the examples described in the above embodiments and exemplary implementations, and will not be repeated here.

[0088] It should be apparent to those skilled in the art that the modules or steps of the application described above can be implemented with general computing devices, which can be centralized on a single computing device or distributed on a network of multiple computing devices, and which can be implemented with program codes executable by the computing devices, so that they can be stored in storage devices and executed by the computing devices, and in some cases, the steps shown or described can be executed in different orders than shown, or made into individual integrated circuit modules, or made into a single integrated circuit module. Thus, the present application is not limited to any particular combination of hardware and software.

[0089] The preferred embodiments of the present application described above are only used to explain the principles of the present application and not limit the present application. Any modification, equivalent replacement, improvement, etc. within the principles of the present application should be included in the protection scope of the present application.

Claims

1. A control circuit, characterized by The energy management system, the control unit, the relay and the power supply circuit, wherein The energy management system is connected with the control unit, the relay and the power supply circuit, and is configured to detect a first communication state of the control unit; in a case where the first communication state indicates that the energy management system and the control unit are in an abnormal communication state, detect a first power-on state of the control unit, and output a control signal according to the first power-on state; The relay is connected with the control unit and the power supply circuit, and is configured to receive the control signal, and control on-off of the relay according to the control signal; The power supply circuit is configured to input a voltage to the control unit according to the on-off of the relay. The power supply circuit comprises a power supply unit and a power supply micro-break switch connected with the power supply unit, wherein 2. The circuit of claim 1, wherein, The power supply unit is configured to input a voltage to the control unit according to the on-off of the relay; The power supply micro-break switch is configured to adjust an on-off state of the power supply micro-break switch according to a working state of the power supply unit. The power supply micro-break switch comprises:

3. The circuit of claim 2, wherein, A first normally open contact and an auxiliary normally open contact, wherein A first pin of the first normally open contact is connected with a positive electrode of the power supply unit, and a second pin of the first normally open contact is connected with a first pin of a normally closed contact of the relay; A first pin of the auxiliary normally open contact is connected with a second normally open contact of the power supply unit, and a second pin of the auxiliary normally open contact is connected with an input pin of the energy management system. The first normally open contact is configured to adjust the on-off state of the first normally open contact to a closed state in a case where the working state of the power supply unit is a normal working state; and adjust the on-off state of the first normally open contact to an open state in a case where the working state of the power supply unit is an abnormal working state.

4. The circuit of claim 3, wherein, The auxiliary normally open contact is configured to adjust the on-off state of the auxiliary normally open contact to a closed state in a case where the working state of the power supply unit is a normal working state; and adjust the on-off state of the auxiliary normally open contact to an open state in a case where the working state of the power supply unit is an abnormal working state. The energy management system is further configured to receive a first level signal in a case where the on-off state of the auxiliary normally open contact is the closed state, and determine the first power-on state of the control unit to be a normal power-on state according to the first level signal; and receive a second level signal in a case where the on-off state of the auxiliary normally open contact is the open state, and determine the first power-on state of the control unit to be an abnormal power-on state according to the second level signal. The relay comprises an electromagnet and a normally closed contact, wherein 5. The circuit of claim 3, wherein, A first end of a coil of the electromagnet is connected with a first output pin of the energy management system, and a second end of the coil is connected with a second output pin of the energy management system. ​ ​ 6. The circuit of claim 5, wherein, ​ ​ ​ 7. The circuit of claim 1, wherein ​ ​ ​ The first pin of the normally closed contact is connected with the second pin of a first normally open contact in the power supply circuit, and the second pin of the normally closed contact is connected with the positive pole of the control unit.

8. The circuit of claim 7, wherein, The application relates to an energy management system. The electromagnet is used for generating a magnetic field when the energy management system outputs a control signal to the coil. The normally closed contact is used for controlling the normally closed contact to be disconnected when the electromagnet generates a magnetic field.

9. The circuit of claim 1, wherein, The energy management system is further used for outputting the control signal within a preset time period when the first energization state of the control unit is a normal energization state, and prohibiting the output of the control signal when the first energization state of the control unit is an abnormal energization state. The energy management system is further used for detecting a second communication state of the control unit after continuously outputting the control signal within a preset time period.

10. The circuit of claim 9, wherein, The control signal is continuously outputted again within the preset time period when the second communication state indicates that the energy management system and the control unit are in an abnormal communication state. The control signal is prohibited from being outputted when the second communication state indicates that the energy management system and the control unit are in a normal communication state. ​ ​

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