Standby power supply system and synchronous shutoff method

Abstract

The present application provides a standby power supply system and a synchronous shutoff method. At least one standby power supply among a plurality of standby power supplies is used as a redundant power supply. The plurality of standby power supplies are connected by means of a communication bus and share discharge states by means of the communication bus. Each of the standby power supplies comprises a synchronous shutoff circuit, and respective output ends of the synchronous shutoff circuits in the plurality of standby power supplies are connected by means of a signal bus. When the number of standby power supplies of which the discharge state is a discharge stop state is greater than the number of redundant power supplies, the output end of the synchronous shutoff circuit of any one of the standby power supplies outputs a shutoff level signal, and, in response to the shutoff level signal, each synchronous shutoff circuit controls all of the standby power supplies to be synchronously shut off. The present application achieves synchronous shutoff of the plurality of standby power supplies in the standby power supply system by means of the synchronous shutoff circuit outputting the shutoff level signal, thereby avoiding the drawbacks of the susceptibility of digital signals to interference and delay, and improving the stability and the shutoff response speed of the standby power supply system.

Description

Backup power supply system and synchronous shutdown method

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 19, 2024, with application number 202410079695.0. The entire contents of the above application are incorporated by reference into this application.

[0002] Technical Field

[0003] The present application relates to power supply technology, and in particular to a backup power supply system and a synchronous shutdown method.

[0004] Background Art

[0005] With the rapid development of the big data era, more and more highly intelligent and high-computing data center power distribution systems have been deployed worldwide. The backup power system of the data center is also a key link. The backup power supply parallel synchronous shutdown signal processing mechanism needs to meet the system redundancy (2N or N+1) design requirements while also having high reliability and stability requirements.

[0006] Technical issues

[0007] Currently, there are two main methods for processing the synchronous shutdown signal of parallel backup power supplies. One method is to establish a communication link between multiple parallel power supplies after connecting them in parallel. This method uses communication data frames to receive and identify each other. This method can achieve synchronous shutdown of multiple parallel power supplies while ensuring redundancy. However, digital signals are susceptible to interference and have corresponding delays, making it impossible to meet the requirements for simultaneous and rapid shutdown of multiple backup power supplies.

[0008] Technical Solutions

[0009] In a first aspect, the present application provides a backup power supply system, comprising multiple backup power supplies, at least one of the multiple backup power supplies serving as a redundant power supply, the multiple backup power supplies being connected via a communication bus, and the multiple backup power supplies sharing a discharge state via the communication bus;

[0010] Each of the backup power supplies includes a synchronous shutdown circuit, and output ends of the synchronous shutdown circuits in the multiple backup power supplies are connected via a signal bus;

[0011] When the number of backup power supplies in the discharge state of stopping discharge is greater than the number of redundant power supplies, the output end of the synchronous shutdown circuit of any backup power supply outputs a shutdown level signal, and each of the synchronous shutdown circuits controls all the backup power supplies to be shut down synchronously in response to the shutdown level signal.

[0012] Optionally, the synchronous shutdown circuit includes a main control chip, a switch unit and a signal acquisition unit;

[0013] The signal output end of the main control chip is connected to the control end of the switch unit, the first end of the switch unit is connected to the reference power supply, the second end of the switch unit is grounded, and the output end of the switch unit serves as the output end of the synchronous shutdown circuit;

[0014] The input end of the signal acquisition unit is connected to the output end of the switch unit, and the output end of the signal acquisition unit is connected to the signal acquisition end of the main control chip;

[0015] The main control chip of each synchronous shutdown circuit is connected via a communication bus, and the output end of each switch unit of the synchronous shutdown circuit is connected via a signal bus;

[0016] When the number of backup power supplies in the discharge state of stopping discharge is greater than the number of the redundant power supplies, the signal output end of the main control chip in the synchronous shutdown circuit of any of the backup power supplies outputs a first control signal to control the switch unit to be turned on, and the output end of the switch unit outputs a shutdown level signal. The main control chip of each synchronous shutdown circuit collects the shutdown level signal through the signal acquisition unit to control all the backup power supplies to be shut down synchronously.

[0017] Optionally, the switching unit includes a switching transistor and a voltage-dividing resistor, the first end of the voltage-dividing resistor is connected to a reference power supply, the second end of the voltage-dividing resistor is connected to the first end of the switching transistor, the second end of the switching transistor is grounded, the control end of the switching transistor is connected to the signal output end of the main control chip, and the first end of the switching transistor serves as the output end of the switching unit.

[0018] Optionally, the signal acquisition unit includes an acquisition resistor, a first end of the acquisition resistor is connected to the output end of the switch unit, and a second end of the acquisition resistor is connected to the signal acquisition end of the main control chip.

[0019] Optionally, the communication bus is a CAN bus, a LAN bus or a MODBUS bus.

[0020] In a second aspect, the present application provides a method for synchronously shutting down a backup power supply, based on the backup power supply system provided above in the present application, comprising:

[0021] When the target backup power source stops discharging, it reports the discharging status of stopping discharging to other backup power sources through the communication bus;

[0022] Any backup power supply determines whether the number of backup power supplies currently in a discharging state of stopped discharging is greater than the number of redundant power supplies;

[0023] When the number of backup power supplies in the discharge state of stopping discharge is greater than the number of redundant power supplies, the output end of the synchronous shutdown circuit of any backup power supply outputs a shutdown level signal, and each of the synchronous shutdown circuits controls all the backup power supplies to be shut down synchronously in response to the shutdown level signal.

[0024] Optionally, the backup power supply synchronous shutdown method further includes:

[0025] When the number of backup power supplies in the discharging state of stopping discharging is less than or equal to the number of redundant power supplies, the step of executing any backup power supply determining whether the number of backup power supplies in the discharging state of stopping discharging is greater than the number of redundant power supplies is returned.

[0026] Optionally, the backup power supply synchronous shutdown method further includes:

[0027] When the discharge time of the target backup power supply exceeds the preset time, or the target backup power supply is overloaded, or the target backup power supply receives an external stop discharge command, the target backup power supply stops discharging and reports the discharge status of stopping discharging to other backup power supplies through the communication bus.

[0028] Optionally, after each of the synchronous shutdown circuits controls all of the backup power supplies to be synchronously shut down in response to the shutdown level signal, the method further includes:

[0029] The level signal of the output end of each synchronous shutdown circuit is reset to reset the discharge state of the backup power supply.

[0030] Optionally, after resetting the discharge state of the backup power supply, the method further includes:

[0031] After the backup power supply is replaced, determining whether the number of backup power supplies whose current discharging state is stopped is zero;

[0032] In response to the number of backup power supplies in a current discharging state of stopped discharging being zero, all backup power supplies stop sending messages to the communication bus;

[0033] In response to the number of backup power supplies whose current discharge state is to stop discharging being not zero, the backup power supplies whose current discharge state is to stop discharging continuously report the discharge state of stopping discharging to other backup power supplies through the communication bus, and return to execute the step of any backup power supply determining whether the number of backup power supplies whose current discharge state is to stop discharging is greater than the number of redundant power supplies.

[0034] Beneficial effects

[0035] The backup power supply system provided by the present application includes multiple backup power supplies, at least one of the multiple backup power supplies serves as a redundant power supply, the multiple backup power supplies are connected via a communication bus, the multiple backup power supplies share a discharge state via the communication bus, each backup power supply includes a synchronous shutdown circuit, the output ends of the synchronous shutdown circuits in the multiple backup power supplies are connected via a signal bus, when the number of backup power supplies in the discharge state of stopping discharge is greater than the number of redundant power supplies, the output end of the synchronous shutdown circuit of any backup power supply outputs a shutdown level signal, and each synchronous shutdown circuit controls all backup power supplies to shut down synchronously in response to the shutdown level signal. The present application utilizes the synchronous shutdown circuit to output a shutdown level signal to achieve synchronous shutdown of multiple backup power supplies in the backup power supply system, thereby avoiding interference with digital signals and the existence of time delays, thereby improving the stability and shutdown response speed of the backup power supply system.

[0036] BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG1 is a schematic structural diagram of a backup power supply system provided in an embodiment of the present application;

[0038] FIG2 is a circuit diagram of a synchronous shutdown circuit in a backup power supply;

[0039] FIG3 is a circuit diagram of a synchronous shutdown circuit connection in a backup power supply;

[0040] FIG4 is a flow chart of a method for synchronously shutting down a backup power supply provided in an embodiment of the present application.

[0041] Modes for Carrying Out the Invention

[0042] The technical solutions of the embodiments of the present application will be described below in conjunction with the accompanying drawings. The described embodiments are only part of the embodiments of the present application, but not all of the embodiments.

[0043] In the description of this application, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. A person of ordinary skill in the art will be able to understand the meaning of the above terms in this application in specific contexts.

[0044] In the present application, unless otherwise specified and limited, a first feature being "above" or "below" a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or indicates that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or indicates that the first feature is at a lower level than the second feature. In addition, the terms "first" and "second" are used to distinguish in description and do not have special meanings.

[0045] Figure 1 is a schematic structural diagram of a backup power supply system provided in an embodiment of the present application, and Figure 2 is a circuit diagram of a synchronous shutdown circuit in the backup power supply. As shown in Figures 1 and 2, the backup power supply system includes multiple backup power supplies (Battery Backup Unit, BBU), and at least one of the multiple backup power supplies serves as a redundant power supply. The backup power supply system is configured to start when the power supply bus fails to supply power normally, and temporarily supply power to the power-consuming equipment. For example, the backup power supply can supply power to the power-consuming equipment in parallel. Among them, the redundant power supply can serve as a backup to replace the failed backup power supply when other backup power supplies fail. Multiple backup power supplies are connected through a communication bus, and multiple backup power supplies share a discharge status through the communication bus, that is, the backup power supply reports its own discharge status to other backup power supplies through the communication bus. For example, as shown in Figure 1, this embodiment is described by taking the example of a backup power supply system including 6 backup power supplies, one of which serves as a redundant power supply. The communication bus can be a controller area network (CAN) bus, a local area network (LAN) bus or a MODBUS bus, which is not limited in the embodiments of the present application. For example, in Figures 1 and 2, the communication bus is described as a CAN bus.

[0046] Each backup power supply includes a synchronous shutdown circuit, and output ends of the synchronous shutdown circuits in all backup power supplies are connected via a signal bus 130 .

[0047] When the backup power supply system is supplying power normally, multiple backup power supplies supply power to the power-consuming equipment at the same time, and the backup power supply system will not trigger a synchronous shutdown. The backup power supply reports its own discharge status to other backup power supplies through the communication bus. When the number of backup power supplies in the discharge state of stopping discharge is greater than the number of redundant power supplies, it means that the output voltage of the backup power supply system cannot meet the normal operation of the power-consuming equipment. At this time, the backup power supply system should be shut down in time to avoid overload damage to the backup power supply system or undervoltage failure of the power-consuming equipment. At this time, the output end of the synchronous shutdown circuit of any backup power supply outputs a shutdown level signal. Since the output ends of the synchronous shutdown circuits in all backup power supplies are connected through the signal bus 130, the output ends of the synchronous shutdown circuits in all backup power supplies are shutdown level signals, and each synchronous shutdown circuit controls the synchronous shutdown of all backup power supplies in response to the shutdown level signal. The embodiment of the present application utilizes the synchronous shutdown circuit to output a shutdown level signal to achieve synchronous shutdown of multiple backup power supplies in the backup power supply system, avoids interference with digital signals, and prevents the existence of time delays, thereby improving the stability and shutdown response speed of the backup power supply system.

[0048] The backup power supply system provided by the embodiment of the present application includes multiple backup power supplies, at least one of the multiple backup power supplies serves as a redundant power supply, the multiple backup power supplies are connected via a communication bus, the multiple backup power supplies share a discharge state via the communication bus, each backup power supply includes a synchronous shutdown circuit, the output ends of the synchronous shutdown circuits in the multiple backup power supplies are connected via a signal bus 130, when the number of backup power supplies in the discharge state that stops discharging is greater than the number of redundant power supplies, the output end of the synchronous shutdown circuit of any backup power supply outputs a shutdown level signal, and each synchronous shutdown circuit controls all backup power supplies to shut down synchronously in response to the shutdown level signal. The present application utilizes the synchronous shutdown circuit to output a shutdown level signal to achieve synchronous shutdown of multiple backup power supplies in the backup power supply system, thereby avoiding interference with digital signals and the existence of time delays, thereby improving the stability and shutdown response speed of the backup power supply system.

[0049] In some embodiments of the present application, as shown in FIG2 , a synchronous shutdown circuit includes a main control chip (microcontroller unit (MCU)), a switch unit 110, and a signal acquisition unit 120. The signal output terminal DO_SYNC_STOP of the main control chip MCU is connected to the control terminal of the switch unit 110. A first terminal of the switch unit 110 is connected to a reference power supply VCC, a second terminal of the switch unit 110 is grounded, and an output terminal SYNC_STOP of the switch unit 110 serves as the output terminal of the synchronous shutdown circuit.

[0050] The input end of the signal acquisition unit 120 is connected to the output end SYNC_STOP of the switch unit 110 , and the output end of the signal acquisition unit 110 is connected to the signal acquisition end DI_SYNC_STOP of the main control chip MCU.

[0051] The main control chip MCU of each synchronous shutdown circuit is connected via a communication bus (CAN bus), and the output terminal SYNC_STOP of the switch unit 110 of each synchronous shutdown circuit is connected via a signal bus 130 .

[0052] The backup power supply reports its own discharge status to other backup power supplies through the communication bus. When the number of backup power supplies in the discharge state of stopping discharging is greater than the number of redundant power supplies, the signal output terminal DO_SYNC_STOP of the main control chip MCU in the synchronous shutdown circuit of any backup power supply outputs a first control signal to control the switch unit 110 to be turned on, the switch unit 110 to be grounded, and the output terminal SYNC_STOP of the switch unit 110 to output a shutdown level signal (low level). Since the output terminals SYNC_STOP of the synchronous shutdown circuits in all backup power supplies are connected through the signal bus 130, the output terminals SYNC_STOP of the synchronous shutdown circuits in all backup power supplies are pulled down to a low level. The main control chip MCU of each synchronous shutdown circuit collects the shutdown level signal through the signal acquisition unit 120 to control all backup power supplies to be shut down synchronously.

[0053] In some embodiments of the present application, as shown in FIG2 , the switch unit 110 includes a switching transistor Q1 and a voltage-dividing resistor R4 . The first end of the voltage-dividing resistor R4 is connected to a reference power supply VCC, the second end of the voltage-dividing resistor R4 is connected to the first end of the switching transistor Q1 , the second end of the switching transistor Q1 is grounded, the control end of the switching transistor Q1 is connected to the signal output end DO_SYNC_STOP of the main control chip MCU, and the first end of the switching transistor Q1 serves as the output end SYNC_STOP of the switch unit 110 . The voltage-dividing resistor R4 performs a voltage division function.

[0054] Exemplarily, as shown in FIG2 , the signal acquisition unit 120 includes an acquisition resistor R2 , a first end of the acquisition resistor R2 is connected to the output terminal SYNC_STOP of the switch unit 110 , and a second end of the acquisition resistor R2 is connected to the signal acquisition terminal DI_SYNC_STOP of the main control chip MCU.

[0055] For example, when the backup power system is operating normally and multiple backup power supplies are simultaneously supplying power to a powered device, the backup power system will not trigger a synchronous shutdown. At this point, the signal output terminal DO_SYNC_STOP of the main control chip MCU in the synchronous shutdown circuit for the multiple backup power supplies outputs a second control signal (low level), controlling the switching transistor Q1 to turn off. The first terminal of the switching transistor Q1 then outputs a high level, and the multiple backup power supplies remain operational.

[0056] The backup power supply reports its own discharge status to other backup power supplies through the communication bus. When the number of backup power supplies in the discharge state of stopping discharging is greater than the number of redundant power supplies, the signal output terminal DO_SYNC_STOP of the main control chip MCU in the synchronous shutdown circuit of any backup power supply outputs a first control signal (high level) to control the switching transistor Q1 to turn on, and the level of the first end SYNC_STOP of the switching transistor Q1 is pulled to a low level. Since the output terminals SYNC_STOP of the synchronous shutdown circuits in all backup power supplies are connected through the signal bus 130, the output terminals SYNC_STOP of the synchronous shutdown circuits in all backup power supplies are pulled down to a low level. The main control chip MCU of each synchronous shutdown circuit collects the shutdown level signal (low level) through the collection resistor R2, and controls all backup power supplies to be shut down synchronously.

[0057] For example, as shown in Figure 2, in some embodiments of the present application, the control end of the switching transistor Q1 is connected to the signal output end DO_SYNC_STOP of the main control chip MCU through the current limiting resistor R1. The current limiting resistor R1 plays a role in current limiting to prevent the switching transistor Q1 from being damaged due to excessive peak current.

[0058] For example, as shown in FIG2 , in some embodiments of the present application, the control terminal and the second terminal of the switching transistor Q1 are connected to a resistor R3 and a capacitor C1. The first terminal of the resistor R3 is connected to the control terminal of the switching transistor Q1, and the second terminal of the resistor R3 is connected to the second terminal of the switching transistor Q1. The first terminal of the capacitor C1 is connected to the control terminal of the switching transistor Q1, and the second terminal of the capacitor C1 is connected to the second terminal of the switching transistor Q1. The resistor R3 and the capacitor C1 function to discharge static electricity, preventing static electricity accumulation from causing breakdown of the switching transistor Q1.

[0059] For example, as shown in FIG2 , in some embodiments of the present application, the first end of acquisition resistor R2 is further connected to capacitor C2. The first end of capacitor C2 is connected to the first end of acquisition resistor R2, and the second end of capacitor C2 is grounded. Capacitor C2 filters out interference signals and ensures the accuracy of the voltage level collected by the main control chip MCU.

[0060] An embodiment of the present application also provides a method for synchronously shutting down a backup power supply. The method is based on the backup power supply system provided by any of the foregoing embodiments of the present application. Figure 4 shows a method for synchronously shutting down a backup power supply provided by an embodiment of the present application, which includes the following steps.

[0061] S101: When the target backup power source stops discharging, the target backup power source reports the discharging status of stopping discharging to other backup power sources via a communication bus.

[0062] When the backup power supply system is supplying power normally, multiple backup power supplies supply power to the power-consuming equipment at the same time, and the backup power supply system will not trigger a synchronous shutdown. When the target backup power supply stops discharging, the discharge status of stopping discharging is reported to other backup power supplies through the communication bus. For example, the discharge status of stopping discharging is represented by "1", and the discharge status of discharging is represented by "0". The backup power supply reports its own discharge status to other backup power supplies through the communication bus. In an embodiment of the present application, the backup power supply does not report the discharge status through the communication bus at regular intervals. Instead, when the target backup power supply stops discharging, the backup power supply reports the discharge status of stopping discharging to other backup power supplies through the communication bus, that is, the reporting is changed from regular reporting to event-driven reporting, which can reduce the burden on the communication bus.

[0063] Exemplarily, the conditions for the target backup power supply to stop discharging include the discharge time of the target backup power supply exceeding the preset time, the target backup power supply being overloaded, and the target backup power supply receiving an external stop-discharge command. When the discharge time of the target backup power supply exceeds the preset time, or the target backup power supply is overloaded, or the target backup power supply receives an external stop-discharge command, the target backup power supply stops discharging and reports the discharge status of stopping discharging to other backup power supplies through the communication bus.

[0064] S102: Any backup power supply determines whether the number of backup power supplies currently in a discharging stop state is greater than the number of redundant power supplies.

[0065] Exemplarily, any backup power supply determines whether the number of backup power supplies currently in a discharging state of stopped discharging is greater than the number of redundant power supplies. Exemplarily, as shown in FIG1 , this embodiment illustrates an example in which a backup power supply system includes six backup power supplies, one of which serves as a redundant power supply. Then, any backup power supply determines whether the number of backup power supplies currently in a discharging state of stopped discharging is greater than one.

[0066] S103. When the number of backup power supplies in the discharging state of stopping discharging is greater than the number of redundant power supplies, the output end of the synchronous shutdown circuit of any backup power supply outputs a shutdown level signal, and each synchronous shutdown circuit controls all backup power supplies to be synchronously shut down in response to the shutdown level signal.

[0067] For example, when the number of backup power supplies that stop discharging in the discharge state is greater than the number of redundant power supplies, it means that the output voltage of the backup power supply system cannot meet the normal operation of the power-consuming equipment. At this time, the backup power supply system should be shut down in time to avoid overload damage to the backup power supply system or undervoltage failure of the power-consuming equipment. At this time, the output end of the synchronous shutdown circuit of any backup power supply outputs a shutdown level signal. Since the output ends of the synchronous shutdown circuits in all backup power supplies are connected through the signal bus 130, the output ends of the synchronous shutdown circuits in all backup power supplies are shutdown level signals. Each synchronous shutdown circuit controls the synchronous shutdown of all backup power supplies in response to the shutdown level signal. The embodiment of the present application utilizes the synchronous shutdown circuit to output a shutdown level signal to achieve synchronous shutdown of multiple backup power supplies in the backup power supply system, avoids the digital signal from being easily interfered with, and has a time delay, thereby improving the stability and shutdown response speed of the backup power supply system.

[0068] For example, referring to Figure 2, when the backup power system is operating normally and multiple backup power supplies are simultaneously supplying power to a powered device, the backup power system will not trigger a synchronous shutdown. At this point, the signal output terminal DO_SYNC_STOP of the main control chip MCU in the synchronous shutdown circuit for the multiple backup power supplies outputs a second control signal (low level), controlling the switching transistor Q1 to turn off. The first terminal of the switching transistor Q1 then outputs a high level, and the multiple backup power supplies remain operational.

[0069] The backup power supply reports its own discharge status to other backup power supplies through the communication bus. When the number of backup power supplies in the discharge state of stopping discharging is greater than the number of redundant power supplies, the signal output terminal DO_SYNC_STOP of the main control chip MCU in the synchronous shutdown circuit of any backup power supply outputs a first control signal (high level) to control the switching transistor Q1 to turn on, and the level of the first end SYNC_STOP of the switching transistor Q1 is pulled to a low level. Since the output terminals SYNC_STOP of the synchronous shutdown circuits in all backup power supplies are connected through the signal bus 130, the output terminals SYNC_STOP of the synchronous shutdown circuits in all backup power supplies are pulled down to a low level. The main control chip MCU of each synchronous shutdown circuit collects the shutdown level signal (low level) through the collection resistor R2, and controls all backup power supplies to be shut down synchronously.

[0070] For example, as shown in FIG4 , in some embodiments of the present application, when the number of backup power supplies in the discharge state of stopping discharging is less than or equal to the number of redundant power supplies, the step of executing any backup power supply to determine whether the number of backup power supplies in the current discharge state of stopping discharging is greater than the number of redundant power supplies is returned until the number of backup power supplies in the discharge state of stopping discharging is greater than the number of redundant power supplies.

[0071] In some embodiments of the present application, as shown in FIG4 , after each synchronous shutdown circuit controls all backup power supplies to be synchronously shut down in response to the shutdown level signal, the method further includes:

[0072] S104 , resetting the level signal of the output end of each synchronous shutdown circuit to reset the discharge state of the backup power supply.

[0073] In an embodiment of the present application, after each synchronous shutdown circuit controls all backup power supplies to be synchronously shut down in response to the shutdown level signal, the level signal at the output end of each synchronous shutdown circuit is reset to reset the discharge state of the backup power supply.

[0074] For example, referring to Figure 2, after each synchronous shutdown circuit controls all backup power supplies to be synchronously shut down in response to the shutdown level signal, the signal output terminal DO_SYNC_STOP of the main control chip MCU of each synchronous shutdown circuit outputs a second control signal (low level), controlling the switching transistor Q1 to be turned off, and the first end of the switching transistor Q1 is restored to a high level, and the discharge status of multiple backup power supplies is reset to "0", preparing for subsequent work of the backup power supply system.

[0075] In some embodiments of the present application, after resetting (clearing) the discharge state of the backup power supply, the method further includes:

[0076] The backup power supply that cannot discharge normally is replaced, and after the backup power supply is replaced, it is determined whether the number of backup power supplies whose current discharge state is stopped is zero.

[0077] If so, it means that all backup power sources are normal, and then all backup power sources stop sending messages to the communication bus to reduce the burden on the communication bus.

[0078] If not, the backup power supply whose discharge state is to stop discharging continues to report the discharge state of stopping discharging to other backup power supplies through the communication bus, and returns to the step of executing any backup power supply to determine whether the number of backup power supplies whose current discharge state is to stop discharging is greater than the number of redundant power supplies.

[0079] In the description of this document, it should be understood that the terms "up", "down", "left", "right", and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0080] Throughout this specification, references to terms such as "an embodiment" or "example" mean that the features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0081] In addition, although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in multiple embodiments can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A backup power supply system includes a plurality of backup power supplies, at least one of the plurality of backup power supplies being used as a redundant power supply. The plurality of backup power supplies are connected by a communication bus, and the plurality of backup power supplies share a discharge state through the communication bus. Each of the backup power supplies includes a synchronous shutdown circuit, and the output ends of the synchronous shutdown circuits in the plurality of backup power supplies are connected by a signal bus. When the number of backup power supplies in the stop-discharge state is greater than the number of redundant power supplies, the output end of the synchronous shutdown circuit of any one of the backup power supplies outputs a shutdown level signal, and each synchronous shutdown circuit controls all the backup power supplies to shut down synchronously in response to the shutdown level signal.

2. The system according to claim 1, wherein The synchronous shutdown circuit includes a main control chip, a switch unit, and a signal acquisition unit. The signal output end of the main control chip is connected to the control end of the switch unit. The first end of the switch unit is connected to a reference power supply, the second end of the switch unit is grounded, and the output end of the switch unit serves as the output end of the synchronous shutdown circuit. The input end of the signal acquisition unit is connected to the output end of the switch unit, and the output end of the signal acquisition unit is connected to the signal acquisition end of the main control chip. The main control chips of each synchronous shutdown circuit are connected by the communication bus, and the output ends of the switch units of each synchronous shutdown circuit are connected by the signal bus. When the number of backup power supplies in the stop-discharge state is greater than the number of redundant power supplies, the signal output end of the main control chip in the synchronous shutdown circuit of any one of the backup power supplies outputs a first control signal to control the switch unit to conduct. The output end of the switch unit outputs the shutdown level signal, and the main control chip of each synchronous shutdown circuit acquires the shutdown level signal through the signal acquisition unit to control all the backup power supplies to shut down synchronously.

3. The system according to claim 2, wherein, The switch unit includes a switching transistor and a voltage-dividing resistor. The first end of the voltage-dividing resistor is connected to the reference power supply, the second end of the voltage-dividing resistor is connected to the first end of the switching transistor, the second end of the switching transistor is grounded, the control end of the switching transistor is connected to the signal output end of the main control chip, and the first end of the switching transistor serves as the output end of the switch unit.

4. The system according to claim 2 or 3, wherein The signal acquisition unit includes an acquisition resistor. The first end of the acquisition resistor is connected to the output end of the switch unit, and the second end of the acquisition resistor is connected to the signal acquisition end of the main control chip.

5. The system according to any one of claims 1 to 3, wherein The communication bus is a Controller Area Network (CAN) bus, a Local Area Network (LAN) bus, or a MODBUS bus.

6. A method for synchronously shutting down backup power supplies, which is applied to the backup power supply system according to any one of claims 1 to 5, includes: When the target backup power supply stops discharging, report the stop-discharge state to other backup power supplies through the communication bus. Judge whether the number of backup power supplies in the current stop-discharge state is greater than the number of redundant power supplies through any one of the backup power supplies. When the number of backup power supplies in the stopped-discharge state is greater than the number of redundant power supplies, control the output terminal of the synchronization shutdown circuit of any one of the backup power supplies to output a shutdown level signal, and each synchronization shutdown circuit controls all the backup power supplies to be synchronously shut down in response to the shutdown level signal.

7. The method according to claim 6, further comprising: When the number of backup power supplies in the stopped-discharge state is less than or equal to the number of redundant power supplies, return to execute determining whether the number of backup power supplies in the stopped-discharge state determined by any one of the backup power supplies is greater than the number of redundant power supplies.

8. The method according to claim 6, further comprising: When the discharge duration of the target backup power supply exceeds a preset duration, or the target backup power supply is overloaded, or the target backup power supply receives an external stop-discharge command, control the target backup power supply to stop discharging, and report the stop-discharge state to the other backup power supplies through the communication bus.

9. The method according to any one of claims 6 to 8, wherein, After each synchronization shutdown circuit controls all the backup power supplies to be synchronously shut down in response to the shutdown level signal, further comprising: Reset the level signal of the output terminal of each synchronization shutdown circuit to reset the discharge state of the backup power supply.

10. The method according to claim 9, wherein After resetting the discharge state of the backup power supply, further comprising: After replacing the backup power supply, determine whether the number of backup power supplies in the stopped-discharge state is zero; In response to the number of backup power supplies in the stopped-discharge state being zero, control all the backup power supplies to stop sending messages to the communication bus; In response to the number of backup power supplies in the stopped-discharge state not being zero, the backup power supplies in the stopped-discharge state continuously report the stop-discharge state to the other backup power supplies through the communication bus, and return to execute determining whether the number of backup power supplies in the stopped-discharge state determined by any one of the backup power supplies is greater than the number of redundant power supplies.

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