A power down control apparatus and method

Abstract

The embodiment of the present application discloses a power-off control device and method. The device comprises a power monitor, a hardware power-off board and a power-off device, the priority of the power monitor is higher than that of the hardware power-off board, the output end of the power monitor is connected with the first input end of the power-off device, the output end of the hardware power-off board is connected with the second input end of the power-off device, and the output end of the power-off device is externally connected with a battery pack. Compared with the prior art, the embodiment of the present application preferentially controls the power-off device through the power monitor when the power monitor is normal, controls the power-off device through the hardware power-off board when the power monitor fails, solves the problem that the power-off operation cannot be executed to control the power-off device to be disconnected due to the removal or failure of the power monitor in the prior art, and protects the battery pack.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of communication power supply, and particularly relate to a power-down control device and method. BACKGROUND

[0002] With the development of communication technology, the coverage of mobile communication network is wider and wider, and it is more and more important to provide a stable and reliable power supply system for mobile communication base station. In a communication power supply system containing a battery pack, a rectifier is usually connected in parallel with the battery pack to supply power to the load. When the rectifier is working, the rectifier supplies power to the load and charges the battery pack at the same time. When AC power is off and the rectifier cannot work, the battery pack supplies power to the load. This working mode can ensure that the power supply of the load will not be interrupted. However, the capacity of the battery pack of the communication power supply system is limited, and the capacity and voltage of the battery pack will gradually decrease with the discharging time. If the time of AC power off is too long, the battery pack is easily damaged irreversibly.

[0003] In order to reduce the damage to the battery pack, the prior art adds a power-down execution device in the power supply circuit of the load and the battery of the communication power supply system. When needed, the power-down execution device is controlled by a power supply monitor to execute a power-down action, so as to cut off the discharging circuit of the battery pack and protect the battery pack from being damaged. When the power supply monitor is removed or fails to execute the power-down operation, the power-down execution device executes the power-down action, and there is a certain safety hazard.

[0004] SUMMARY

[0005] Embodiments of the present application provide a power-down control device and method to solve the problem that the prior art cannot control the power-down execution device to disconnect when the power supply monitor is removed or fails.

[0006] In a first aspect, embodiments of the present application provide a power-down control device, comprising: a power supply monitor, a hardware power-down board and a power-down device, the priority of the power supply monitor is higher than the priority of the hardware power-down board;

[0007] The output end of the power supply monitor is connected with the first input end of the power-down device, the output end of the hardware power-down board is connected with the second input end of the power-down device, and the output end of the power-down device is connected with the battery pack.

[0008] The power supply monitor is configured to generate and send a first power-down control signal to the power-down device when AC power off is monitored and the voltage of the battery pack meets a first power-down condition;

[0009] The hardware power-down board is configured to generate and send a second power-down control signal to the power-down device when the power supply monitor fails and the voltage of the battery pack meets a second power-down condition;

[0010] The power-off device is configured to disconnect the battery pack from the load according to the first power-off control signal or the second power-off control signal.

[0011] Optionally, the hardware power-off board comprises a voltage acquisition module, a voltage comparison module and a pulse generation module.

[0012] The voltage acquisition module, the voltage comparison module and the pulse generation module are sequentially connected.

[0013] The voltage acquisition module is configured to acquire the voltage of the battery pack.

[0014] The voltage comparison module is configured to trigger the pulse generation module to generate the second power-off control signal when the voltage of the battery pack is less than a hardware power-off reference voltage.

[0015] Optionally, the hardware power-off board further comprises a first delay module and a second delay module.

[0016] The voltage comparison module is connected with the pulse generation module through the first delay module and the second delay module.

[0017] The first delay module is set to have a delay time greater than a power-off time set by the power monitor, and the second delay module is set to have a delay time greater than an action time of a power-off relay in the hardware power-off board.

[0018] Optionally, the hardware power-off board further comprises a power supply module, which is connected with the voltage acquisition module, the voltage comparison module and the pulse generation module respectively, and configured to supply power to the voltage acquisition module, the voltage comparison module and the pulse generation module.

[0019] Optionally, the first power-off condition comprises that the voltage of the battery pack is less than a primary load power-off voltage and the voltage of the battery pack is less than a battery power-off voltage threshold, and the primary load power-off voltage is greater than the battery power-off voltage threshold.

[0020] The second power-off condition comprises that the voltage of the battery pack is less than a hardware power-off reference voltage, and the hardware power-off reference voltage is not higher than the battery power-off voltage threshold.

[0021] Optionally, the power monitor is specifically configured to:

[0022] generate and send a primary load power-off control signal to the power-off device to control primary load power-off through the power-off device when AC power is off and the voltage of the battery pack is less than the primary load power-off voltage.

[0023] When the voltage of the battery pack is lower than the battery power-off voltage threshold, a battery power-off control signal is generated and sent to control the battery pack to power off through the power-off device.

[0024] Optionally, the lower electrical board is specifically used for:

[0025] When the power monitor malfunctions and detects that the voltage of the battery pack is lower than the hardware reference voltage, it generates and sends a second power-down control signal to the power-down device.

[0026] Optionally, the power supply device is a magnetically latching contactor or a magnetically latching relay.

[0027] Secondly, embodiments of this application also provide a power-down control method, including:

[0028] If the power monitor is normal, and the power monitor detects an AC power outage and the battery pack voltage meets the first power-down condition, the power monitor disconnects the battery pack from the load through the power-down device.

[0029] If the power monitor fails, and the hardware power-off board detects that the voltage of the battery pack meets the second power-off condition, the hardware power-off board disconnects the battery pack from the load through the power-off device.

[0030] The power monitor has a higher priority than the hardware power supply board.

[0031] Optionally, the first power-down condition includes the battery pack voltage being less than the primary load power-down voltage and the battery pack voltage being less than a battery power-down voltage threshold, wherein the primary load power-down voltage is greater than the battery power-down voltage threshold;

[0032] The second power-down condition includes the battery pack voltage being less than the hardware power-down reference voltage, and the hardware power-down reference voltage not being higher than the battery power-down voltage threshold.

[0033] This application provides a power-down control device and method. The device includes a power monitor, a hardware power-down board, and power-down devices. The power monitor has a higher priority than the hardware power-down board. When the power monitor is normal, the power-down devices are controlled by the power monitor first. When the power monitor malfunctions, the power-down devices are controlled by the hardware power-down board. This solves the problem in the prior art where the power-down operation cannot be performed to disconnect the power-down device due to the removal or malfunction of the power monitor, thus protecting the battery pack. Attached Figure Description

[0034] Figure 1 A structural diagram of a power-down control device provided in an embodiment of this application;

[0035] Figure 2 A structural diagram of another power-down control device provided in an embodiment of this application;

[0036] Figure 3 A schematic diagram illustrating a scenario where the power monitor and hardware power-off board are powered off after the battery pack is powered down, as provided in an embodiment of this application.

[0037] Figure 4 A schematic diagram illustrating a scenario where the power monitor and the hardware power-off board remain powered on after the battery pack is powered off, as provided in an embodiment of this application.

[0038] Figure 5 A flowchart of a power-down control method provided in an embodiment of this application;

[0039] Figure 6 This is a flowchart illustrating the implementation of a power-down control method provided in an embodiment of this application. Detailed Implementation

[0040] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present application are shown in the drawings, not all structures. Moreover, unless otherwise specified, the embodiments and features described in the present application can be combined with each other.

[0041] Figure 1 This is a structural diagram of a power-down control device provided in an embodiment of this application. This embodiment is applicable to situations where the power-down device can still be controlled to power down the load even when the power monitor is removed or malfunctions. (Refer to...) Figure 1 The power-down control device 1 includes: a power monitor 10, a hardware power-down board 11, and a power-down device 12. The power monitor 10 has a higher priority than the hardware power-down board 11.

[0042] The output terminal of the power monitor 10 is connected to the first input terminal of the power-off device 12, the output terminal of the hardware power-off board 11 is connected to the second input terminal of the power-off device 12, and the output terminal of the power-off device 12 is connected to an external battery pack.

[0043] The power monitor 10 is used to generate and send a first power-down control signal to the power-down device 12 when it detects an AC power outage and the voltage of the battery pack meets the first power-down condition.

[0044] The hardware power-down board 11 is used to generate and send a second power-down control signal to the power-down device 12 when the power monitor 10 fails and the voltage of the battery pack meets the second power-down condition.

[0045] The power-down device 12 is used to disconnect the battery pack from the load according to the first power-down control signal or the second power-down control signal.

[0046] Specifically, the power monitor 10 is responsible for the information collection, uploading, and output control of the power system. This embodiment uses power-down control in the output control as an example. The hardware power-down board 11 is used to perform a power-down operation when the power monitor 10 malfunctions or is removed, promptly disconnecting the battery pack from the load to protect the battery pack. In this embodiment, the power monitor 10 has a higher priority than the hardware power-down board 11. That is, when the power monitor 10 is functioning normally, power-down is controlled primarily through the power monitor 10, avoiding the problem of no alarm record when power-down occurs normally. Optionally, the hardware power-down board 11 can determine whether the power monitor 10 is malfunctioning by monitoring the battery pack voltage. For example, if the hardware power-down board 11 detects that the battery pack voltage is lower than the battery power-down voltage threshold set by the power monitor 10, the power-down device 12 does not activate, and the battery pack voltage continues to decrease, then the power monitor 10 is considered to be malfunctioning or removed. Under normal circumstances, if the power monitor 10 is not removed and there is no fault, when the battery pack voltage is lower than the battery power-down voltage threshold set by the power monitor 10, the power monitor 10 will perform a power-down operation, disconnecting the battery pack from the load, and the battery pack voltage will remain basically unchanged. The hardware power-down board 11 can draw power from the backplane of the power monitor 10, and the backplane of the power monitor 10 can draw power from the busbar or the battery pack.

[0047] The power-off device 12 can be a switching device that controls the connection state between the battery pack and the load according to the control of the power monitor 10 or the hardware power-off board 11. It includes a coil and contacts. The coil is used for signal input and controls the opening and closing of the contacts according to the input signal. Optionally, the power-off device 12 is a magnetic latching contactor or a magnetic latching relay. Compared with traditional normally closed DC contactors or normally closed relays, the contacts of magnetic latching contactors or magnetic latching relays do not need to be powered to remain normally open or normally closed. They only need to be energized when performing power-on or power-off operations. After the operation, no electrical energy is consumed, resulting in better energy saving and better protection of the battery pack. Moreover, even if the power monitor 10 is removed or malfunctions after the battery pack is powered off, the magnetic latching contactor or magnetic latching relay will not reoperate, improving the reliability of the system.

[0048] Optionally, in this embodiment, the power monitor 10 and the hardware power-down board 11 are connected to the power-down device 12 via the power-down relay 110 in the hardware power-down board 11. For ease of description, this embodiment separates the hardware power-down board 11 from the power-down relay 110 integrated inside. Figure 1As shown, the output terminal of the power monitor 10 is connected to the first input terminal of the power-down device 12 through the normally closed contact NC of the power-down relay 110. The output terminal of the hardware power-down board 11 is connected to the second input terminal of the power-down device 12 through the normally open contact NO of the power-down relay 110. The coil of the power-down device 12 is connected to the common contact of the power-down relay 110. The first input terminal and the second input terminal of the power-down device 12 are the first input terminal and the second input terminal of the coil of the power-down device 12, respectively. The output terminal, i.e., the contact, of the power-down device 12 is connected to the battery pack and the busbar. For example, when the power monitor 10 is normal, by default, the power monitor 10 outputs a power-down control signal to the coil of the power-down device 12 through the normally closed contact NC, and the power-down device 12 disconnects the battery pack from the load. When the power monitor 10 is removed or malfunctions, the hardware power-down board 11 controls the power-down relay 110 to operate, that is, the normally closed contact NC of the power-down relay 110 opens and the normally open contact NO closes. The hardware power-down control signal is output to the coil of the power-down device 12 through the normally open contact NO, and the power-down device 12 disconnects the battery pack from the load.

[0049] Optionally, the first power-down condition can be that the battery pack voltage is less than the voltage threshold set by the power monitor 10, and the second power-down condition can be that the battery pack voltage is less than the hardware reference voltage set by the hardware power-down board 11, wherein the hardware reference voltage is not higher than the voltage threshold set by the power monitor 10. For example, when the power monitor 10 is functioning normally, if the power monitor 10 detects an AC power outage and the battery pack voltage is less than the voltage threshold set by the power monitor 10, it outputs a first power-down control signal, controlling the battery pack to power down via the power-down device 12. When the power monitor 10 malfunctions, if the hardware power-down board 11 detects that the battery pack voltage is less than the hardware reference voltage, it outputs a second power-down control signal, controlling the battery pack to power down via the power-down device 12. That is, when the power monitor 10 malfunctions, power-down control is achieved through the hardware power-down board 11, protecting the battery pack.

[0050] Optionally, when multiple loads exist, such as primary and secondary loads, corresponding thresholds can be set separately to sequentially disconnect the battery pack from the loads. The primary load is the secondary load, and the secondary load is the primary load. In this case, the first power-down condition can include the battery pack voltage being less than the primary load power-down voltage and the battery pack voltage being less than the battery power-down voltage threshold. The second power-down condition can include the battery pack voltage being less than the hardware power-down reference voltage. The primary load power-down voltage is the voltage at which the secondary load powers down, and the battery power-down voltage threshold is the voltage set by the power monitor 10 to control the battery pack power-down, which can also be understood as the secondary load power-down voltage. The primary load power-down voltage is greater than the battery power-down voltage threshold, and the hardware power-down reference voltage is not higher than the battery power-down voltage threshold.

[0051] For example, when the power monitor 10 is functioning normally, if the power monitor 10 detects an AC power outage and the battery pack voltage is lower than the primary load power-off voltage, it generates and sends a primary load power-off control signal to the power-off device 12. This allows the power-off device 12 to preferentially disconnect the power supply to secondary loads, extending the power supply time of the primary load. If the power monitor 10 detects that the battery pack voltage is lower than the battery power-off voltage threshold, it generates and sends a battery power-off control signal, controlling the battery pack to power off via the power-off device 12. When the power monitor 10 malfunctions and the hardware power-off board 11 detects that the battery pack voltage is lower than the hardware reference voltage, the hardware power-off board 11 generates and sends a second power-off control signal to each power-off device 12, disconnecting the power supply to each load.

[0052] Since the monitoring function of the power monitor 10 is relatively complex, the probability of failure is also relatively high. On the other hand, the hardware power-off board 11 only performs the power-off function, has a simple structure, and is not prone to failure. In this embodiment, the power-off is controlled by the cooperation of the power monitor 10 and the hardware power-off board 11, which greatly reduces the chance of battery pack damage.

[0053] This application provides a power-down control device, including a power monitor, a hardware power-down board, and power-down devices. The power monitor has a higher priority than the hardware power-down board. When the power monitor is normal, the power-down devices are controlled by the power monitor first. When the power monitor malfunctions, the power-down devices are controlled by the hardware power-down board. This solves the problem in the prior art where the power-down operation cannot be performed to disconnect the power-down device due to the removal or malfunction of the power monitor, thus protecting the battery pack.

[0054] Figure 2 This is a structural diagram of another power-down control device provided in an embodiment of this application.

[0055] The power-down control device 1 in this embodiment includes a power monitor 10, a hardware power-down board 11, and a power-down device 12. The hardware power-down board 11 includes a voltage acquisition module 111, a voltage comparison module 112, and a pulse generation module 113, which are connected sequentially. The voltage acquisition module 111 is used to acquire the voltage of the battery pack. The voltage comparison module 112 is used to trigger the pulse generation module 113 when the voltage of the battery pack is lower than the hardware power-down reference voltage, so that the pulse generation module 113 generates a second power-down control signal.

[0056] Specifically, when the power monitor 10 malfunctions, the voltage comparison module 112 compares the battery pack voltage acquired by the voltage acquisition module 111 with the hardware power-down reference voltage. If the battery pack voltage is lower than the hardware power-down reference voltage, the output of the voltage comparison module 112 flips. For example, when the battery pack voltage is higher than the hardware power-down reference voltage, the voltage comparison module 112 outputs a high level; when the battery pack voltage is lower than the hardware power-down reference voltage, the voltage comparison module 112 outputs a low level. The process of switching from a high level to a low level is called flipping. The pulse generation module 113, triggered by the voltage comparison module 112, generates a second power-down control signal.

[0057] The voltage comparison module 112 is a device that can compare two inputs and output different signals based on the comparison result, such as an operational amplifier. The pulse generation module 113 may include two MOSFETs, a transistor, and a multivibrator. When the output of the voltage comparison module 112 flips, the first MOSFET is turned off, the transistor is turned on, and the multivibrator generates a pulse width signal. During this pulse width, the second MOSFET is turned on, energizing the coil of the power-down device 12 and opening the contacts, thereby disconnecting the battery pack from the load. The embodiment does not limit the specific structure of the module that implements this function, as long as the coil of the power-down device 12 can be energized and the contacts opened when the voltage of the battery pack is detected to be lower than the hardware power-down reference voltage.

[0058] The hardware power-down board of this application embodiment performs only one function: power-down. It has a simple structure, convenient wiring, and is easy to replace and install. Moreover, it is not prone to failure. In conjunction with the power monitor, it solves the problem in the prior art where the power-down operation cannot be performed due to the removal or failure of the power monitor, thus protecting the battery pack.

[0059] Based on the above embodiment, the hardware power-down board 11 further includes a first delay module 114 and a second delay module 115. The voltage comparison module 112 is connected to the pulse generation module 113 through the first delay module 114 and the second delay module 115. After the output of the voltage comparison module 112 flips, after a delay time set by the first delay module 114, it prioritizes controlling the power-down relay 110 to operate, completing the selection of the second power-down control signal path. After a delay time of the second delay module 115, it triggers the pulse generation module 113 to control the power-down device 12 to operate, disconnecting the power supply to the load. The delay time set by the first delay module 114 is greater than the power-down time set by the power monitor 10, thus ensuring the high priority of the power monitor 10's power-down control. When the power monitor 10 is normal, it prioritizes power-down control, avoiding the problem of no alarm record when the power monitor 10 is normal. The delay time set by the second delay module 115 only needs to be greater than the operating time of the power-down relay 110 in the hardware power-down board 11.

[0060] Based on the above embodiments, the hardware lower circuit board 11 also includes a power supply module 116, which is connected to the voltage acquisition module 111, the voltage comparison module 112 and the pulse generation module 113 respectively, and is used to convert the 48V voltage to a 5V voltage to power the voltage acquisition module 111, the voltage comparison module 112 and the pulse generation module 113.

[0061] This application embodiment sets a delay module, making the delay time of the delay module greater than the power-down time of the power monitor, thus ensuring the high priority of the power monitor. When the power monitor is normal, the power monitor will control the power-down first, avoiding the problem of no alarm record when the power monitor is powered down normally.

[0062] Figure 3 This is a schematic diagram illustrating a scenario where the power monitor and hardware power-off board are powered off after the battery pack is powered down, as provided in an embodiment of this application.

[0063] Figure 3 This is a communication power supply system built according to actual applications. The system includes a rectifier 41, a power monitor 42, a hardware power supply board 43, a DC surge protection module 44, power supply contactors KM1 and KM2, fuses FU1-FU5, a diode D1, a battery pack 45, a main load RL1, and a secondary load RL2. The rectifier 41 provides the main output to loads RL1 and RL2 and connects to the busbar. In practical applications, a DC / DC module can be used instead. The busbar is... Figure 3 The BUS+ and BUS- ports are connected. Battery pack 45 provides backup power to the main load RL1 and secondary load RL2 during AC power outages. Fuses FU1-FU5 provide short-circuit or overload protection. Power-off contactor KM1 disconnects the power supply to battery pack 45 and the main load RL1. Power-off contactor KM2 disconnects the power supply to the secondary load RL2. Diode D1 provides reverse connection protection. DC surge protector 44 provides DC lightning protection. Figure 3 The power-down contactor KM1 is jointly controlled by the power monitor 42 and the hardware power-down board 43, while the power-down contactor KM2 is controlled by the power monitor 42. Both the power monitor 42 and the hardware power-down board 43 draw power from the busbar.

[0064] When AC power fails and the power-off conditions are met, the power monitor 41 or the hardware power-off board 43 controls the power-off contactors KM1 and KM2 to perform the power-off operation, disconnecting the power supply circuit between the battery pack 45 and all loads, as well as the power supply to the power monitor 41 and the hardware power-off board 43. When AC power is restored, the power monitor 41 is powered on again.

[0065] Figure 4This is a schematic diagram illustrating a scenario where the power monitor and the hardware power-off board remain powered on after the battery pack is powered off, as provided in an embodiment of this application.

[0066] Figure 4 This is another communication power supply system built according to actual applications. The composition of this system is similar to... Figure 3 Basically the same, except Figure 4 The power monitor 42 and the hardware power-down board 43 draw power from the busbar and the battery pack 45 through diodes D2 and D3, respectively. When the power monitor 42 or the hardware power-down board 43 controls the power-down contactors KM1 and KM2 to perform the power-down operation, the power supply circuit of the battery pack 45 is disconnected from all loads. However, the power monitor 42 or the hardware power-down board 43 is still powered. At this time, the power monitor 42 can still monitor the various states of the system. Since the power consumption of the power monitor 42 and the hardware power-down board 43 is very small, the voltage of the battery pack 45 remains basically unchanged.

[0067] Figure 5 This is a flowchart of a power-down control method provided in an embodiment of this application.

[0068] S610. If the power monitor is normal, and the power monitor detects an AC power outage and the battery pack voltage meets the first power-down condition, the power monitor disconnects the battery pack from the load through the power-down device.

[0069] S620. If the power monitor malfunctions, and the hardware power-off board detects that the voltage of the battery pack meets the second power-off condition, the hardware power-off board disconnects the battery pack from the load through the power-off device.

[0070] The power monitor has a higher priority than the hardware power supply board.

[0071] Optionally, the first power-down condition includes the battery pack voltage being less than the primary load power-down voltage and the battery pack voltage being less than a battery power-down voltage threshold, wherein the primary load power-down voltage is greater than the battery power-down voltage threshold;

[0072] The second power-down condition includes the battery pack voltage being less than the hardware power-down reference voltage, and the hardware power-down reference voltage not being higher than the battery power-down voltage threshold.

[0073] The primary load is the secondary load, the secondary load is the primary load, the primary power-down device is the actuator that controls the power supply status of the secondary load, and the secondary power-down device is the actuator that controls the power supply status of the primary load.

[0074] This application provides a power-down control method. If the power monitor is normal, when AC power fails and the battery pack voltage meets the first power-down condition, the power monitor will control the power-down device to disconnect the battery pack from the load. If the power monitor malfunctions, when the battery pack voltage meets the second power-down condition, the power-down device will be controlled by the hardware power-down board to disconnect the battery pack from the load. In other words, by using the power monitor and the hardware power-down board in combination, the problem in the prior art that the power-down operation cannot be performed to control the power-down device to disconnect due to the removal or malfunction of the power monitor is solved, thus protecting the battery pack.

[0075] The power-down control method in this embodiment and the power-down control device in the above embodiment belong to the same inventive concept. For specific details, please refer to the above embodiment, which will not be repeated here.

[0076] Figure 6 This is a flowchart illustrating the implementation of a power-down control method provided in an embodiment of this application.

[0077] Specifically, when an AC power outage occurs in the communication power system, the battery pack continues to supply power to the load. If the power monitor is functioning normally and detects that the battery pack voltage is lower than the primary load power-off voltage, it controls the primary power-off device to disconnect the power supply to the secondary load, thus extending the power supply time to the primary load. During this time, the battery pack continues to discharge. When the battery pack voltage falls below the battery power-off voltage threshold, it controls the secondary power-off device to power off the battery pack. If the power monitor malfunctions, and the hardware power-off board detects that the battery pack voltage is lower than the hardware power-off reference voltage, it controls the power-off device to disconnect the battery pack from the load after a certain hardware power-off delay. Through the cooperation of the power monitor and the hardware power-off board, the problem of the power-off operation being unable to be executed due to the removal or malfunction of the power monitor, thus protecting the battery pack, is solved.

[0078] Note that the above are merely preferred embodiments and the technical principles employed in this application. Those skilled in the art will understand that this application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of this application, the scope of which is determined by the scope of the appended claims.

Claims

1. A power down control device, characterized by, The application relates to a power supply monitoring device, which comprises a power supply monitor, a hardware power-off board and a power-off device, wherein the priority of the power supply monitor is higher than that of the hardware power-off board; the output end of the power supply monitor is connected with the first input end of the power-off device, the output end of the hardware power-off board is connected with the second input end of the power-off device, and the output end of the power-off device is connected with a battery pack; the power supply monitor is used for generating and sending a first power-off control signal to the power-off device when AC power failure is monitored and the voltage of the battery pack meets a first power-off condition; the hardware power-off board is used for generating and sending a second power-off control signal to the power-off device when the power supply monitor fails and the voltage of the battery pack meets a second power-off condition; and the power-off device is used for disconnecting the battery pack from a load according to the first power-off control signal or the second power-off control signal, and the power-off device is a magnetic holding contactor or a magnetic holding relay. The hardware power-off board comprises a voltage acquisition module, a voltage comparison module and a pulse generation module; the voltage acquisition module, the voltage comparison module and the pulse generation module are sequentially connected; the voltage acquisition module is used for acquiring the voltage of the battery pack; and the voltage comparison module is used for triggering the pulse generation module to generate the second power-off control signal when the voltage of the battery pack is lower than a hardware power-off reference voltage. The hardware power-off board further comprises a first delay module and a second delay module; the voltage comparison module is connected with the pulse generation module through the first delay module and the second delay module; the first delay module is set to have a delay time greater than a power-off time set by the power supply monitor, and the second delay module is set to have a delay time greater than the action time of a power-off relay in the hardware power-off board. The hardware power-off board further comprises a power supply module, which is connected with the voltage acquisition module, the voltage comparison module and the pulse generation module and is used for supplying power to the voltage acquisition module, the voltage comparison module and the pulse generation module. The first power-off condition comprises that the voltage of the battery pack is lower than a primary load power-off voltage and that the voltage of the battery pack is lower than a battery power-off voltage threshold value, and the primary load power-off voltage is greater than the battery power-off voltage threshold value; and the second power-off condition comprises that the voltage of the battery pack is lower than a hardware power-off reference voltage, and the hardware power-off reference voltage is not higher than the battery power-off voltage threshold value. The power supply monitor is specifically used for generating and sending a primary load power-off control signal to the power-off device to control primary load power-off through the power-off device when AC power failure and the voltage of the battery pack are lower than the primary load power-off voltage; and generating and sending a battery power-off control signal to control the battery pack power-off through the power-off device when the voltage of the battery pack is lower than the battery power-off voltage threshold value.

2. The apparatus of claim 1, wherein, The hardware power-off board is specifically used for generating and sending a second power-off control signal to the power-off device when the power supply monitor fails and the voltage of the battery pack is lower than a hardware reference voltage. The application further relates to a power supply monitoring method. ​ ​ 3. The apparatus of claim 2, wherein, ​ ​ ​ 4. The apparatus of claim 2, wherein, ​ 5. The device of any one of claims 1-4, wherein, ​ ​ 6. The apparatus of claim 5, wherein, ​ ​ ​ 7. The apparatus of claim 5, wherein, ​ ​ 8. A power down control method, comprising: ​ if the power monitor is normal, and the power monitor monitors that the AC power is off and the voltage of the battery pack meets a first power-down condition, the power monitor disconnects the connection between the battery pack and the load through a power-down device, the power-down device being a magnetic latching contactor or a magnetic latching relay; if the power monitor is faulty, a hardware power-down board monitors that the voltage of the battery pack meets a second power-down condition, the hardware power-down board disconnects the connection between the battery pack and the load through the power-down device; wherein the priority of the power monitor is higher than the priority of the hardware power-down board.

9. The method of claim 8, wherein, the first power-down condition comprises that the voltage of the battery pack is less than a primary load power-down voltage and the voltage of the battery pack is less than a battery power-down voltage threshold, the primary load power-down voltage being greater than the battery power-down voltage threshold; the second power-down condition comprises that the voltage of the battery pack is less than a hardware power-down reference voltage, the hardware power-down reference voltage being not higher than the battery power-down voltage threshold.

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