UPS (Uninterrupted Power Supply) system and control method thereof

Abstract

The invention provides a UPS power supply system and a control method, which are different from a mode that a backup power supply is switched to supply power after a main power supply is detected to be abnormal in a traditional UPS power supply system, and according to the scheme, the backup power supply is normally closed in the main power supply system, so that a switching link after the main power supply is abnormal is omitted, and when the main power supply is abnormal and loses output, the backup power supply is normally closed in the main power supply system. The backup power supply can be seamlessly connected without switching, the requirement for continuous work of electric equipment with high power supply stability requirements is met, meanwhile, the electric equipment is prevented from being impacted in the power supply switching process, and related electric equipment is better protected. Therefore, the method can be better suitable for scenes such as an urban rail transit weak current system with high requirements on power supply stability, and ensures that power supply can be stably maintained under the condition that the rail transit equipment loses a main power supply.

Description

Technical Field

[0001] This application relates to the field of computer technology, and in particular, to a UPS power supply system and a control method thereof. Background Art

[0002] With the rapid development of urban rail transit, rail transit has become one of the most convenient, economical and efficient means of transportation for people to travel. At the same time, higher and higher requirements have been put forward for the safe and reliable operation of urban rail transit. When the main power supply for rail transit fails due to some reasons, it will have a serious impact on rail transit. Therefore, the industry has been continuously researching how to improve the continuity and reliability of power supply for important weak current systems in urban rail transit.

[0003] At present, in urban rail transit projects in various cities in China, weak current systems such as communication, signal, integrated monitoring system, fire automatic alarm system, mechanical and electrical equipment monitoring system, access control system, automatic fare collection system, automatic fire extinguishing system, and platform screen door control system basically set up UPSs independently, adopting a decentralized power supply method. During the process of rail transit construction and operation management, various drawbacks of the decentralized UPSs have gradually emerged. First of all, the UPSs of each weak current system are tendered separately, and the configured UPS brands are also different, which is not conducive to resource sharing and the procurement of spare parts, resulting in problems such as large operation and maintenance workload and difficult battery maintenance. Secondly, each weak current system, on the grounds of "safety reserve", has a conservative design, resulting in a design capacity much larger than the actual load, but mutual redundancy backup cannot be achieved, resulting in large construction investment and high operation and maintenance costs. Moreover, the UPS capacities of each weak current system are generally relatively small, with low reliability, high energy consumption, not conducive to energy conservation and environmental protection, and lack sufficient power supply safety and reliability. The most important point is that when the existing UPS power supply system provides continuous power supply, it needs to switch to the backup power supply after detecting the abnormality of the main power supply. During this switching process, the power supply will be unstable, and the electrical equipment will be impacted by the power supply process, making it difficult to meet the high requirements for power supply stability of weak current systems in urban rail transit. Summary of the Invention

[0004] An object of this application is to provide a UPS power supply system and a control method thereof, which solve the problem that the power supply is unstable when the main power supply switches to the backup power supply, and it is impossible to avoid the impact on electrical equipment caused by the power supply switching process.

[0005] According to one aspect of this application, a UPS power supply system is provided, including a main power supply, a backup power supply, a control module and a monitoring module;

[0006] The positive output terminal of the main power supply is connected to the positive output terminal of the backup power supply and is connected to the positive pole of the load output. The negative output terminal of the main power supply is connected to the negative output terminal of the backup power supply through a control module and is connected to the negative pole of the load output. The control module is used to control the connection state between the negative output terminal of the main power supply and the negative output terminal of the backup power supply. The monitoring module is connected to the control module and is at least used to detect the connection state and current value between the negative output terminal of the main power supply and the negative output terminal of the backup power supply.

[0007] Further, the control module at least includes a battery switch and a DC contactor;

[0008] The negative output terminal of the main power supply is connected to the negative output terminal of the backup power supply through the serially arranged battery switch and DC contactor. When the battery switch or the DC contactor is disconnected, the connection state between the negative output terminal of the main power supply and the negative output terminal of the backup power supply is disconnected.

[0009] Further, the control module further includes a shunt. The shunt is serially arranged with the battery switch and the DC contactor between the negative output terminal of the main power supply and the negative output terminal of the backup power supply. The monitoring module is used to sample the current between the negative output terminal of the main power supply and the negative output terminal of the backup power supply through the shunt to obtain the current value at present.

[0010] Further, the UPS power supply system further includes a host computer. The host computer is connected to the monitoring module to obtain the data detected by the monitoring module and perform data backup.

[0011] Further, the main power supply includes a commercial power supply and an AC-DC rectification module. The commercial power supply is rectified by the AC-DC rectification module to output a DC output that meets the system requirements.

[0012] Further, the backup power supply is a battery module that outputs a DC output that meets the system requirements.

[0013] Further, the UPS power supply system is applied to the weak current system of urban rail transit.

[0014] According to another aspect of the present application, there is also provided a control method for a UPS power supply system, which is used to control the aforementioned UPS power supply system. The control method includes:

[0015] When the battery switch of the control module is closed, close the DC contactor of the control module;

[0016] The monitoring module detects the connection state between the negative output terminal of the main power supply and the negative output terminal of the backup power supply. If the connection state is connected, charge and discharge management of the backup power supply is performed according to the detected current value. If the connection state is disconnected, the DC contactor is disconnected and then closed again after a preset interval, and the connection state between the negative output terminal of the main power supply and the negative output terminal of the backup power supply is detected again until a preset number of times is reached.

[0017] Further, after detecting the connection state between the negative output terminal of the main power supply and the negative output terminal of the backup power supply again until a preset number of times is reached, it further includes:

[0018] The monitoring module reports the information of the backup power supply failure to the host computer.

[0019] Further, when the battery switch of the control module is not closed, the monitoring module reports the information that the backup power supply is not in place to the host computer.

[0020] Compared with the prior art, the embodiment of the present application provides a UPS power supply system, which includes a main power supply, a backup power supply, a control module and a monitoring module. The positive output terminal of the main power supply is connected to the positive output terminal of the backup power supply and is connected to the positive pole of the load output. The negative output terminal of the main power supply is connected to the negative output terminal of the backup power supply through the control module and is connected to the negative pole of the load output. The control module is used to control the connection state between the negative output terminal of the main power supply and the negative output terminal of the backup power supply. The monitoring module is connected to the control module and is at least used to detect the connection state and current value between the negative output terminal of the main power supply and the negative output terminal of the backup power supply. Different from the traditional UPS power supply system that switches to the backup power supply for power supply after detecting that the main power supply is abnormal, the UPS power supply system provided by the present application has the backup power supply normally closed in the main power supply system, omitting the switching link after the main power supply is abnormal. When the main power supply loses its output abnormally, the backup power supply can be seamlessly connected without switching, meeting the continuous working requirements of electrical equipment with high requirements for power stability, and at the same time avoiding the impact on the electrical equipment generated during the power switching process, better protecting the relevant electrical equipment. Therefore, it can be better applied to scenarios with high requirements for power stability such as the weak current system of urban rail transit, ensuring that the rail transit equipment can stably maintain power supply even when the main power supply is lost.

[0021] In addition, the embodiment of the present application also provides a control solution for the UPS power supply system. When the battery switch of the control module is closed, the DC contactor of the control module is closed. At this time, the monitoring module can detect the connection state between the negative output terminal of the main power supply and the negative output terminal of the backup power supply. If the connection state is connected, charge and discharge management of the backup power supply is performed according to the detected current value; if the connection state is disconnected, the DC contactor is disconnected and then closed again after a preset interval, and the connection state between the negative output terminal of the main power supply and the negative output terminal of the backup power supply is detected again until the preset number of times is reached, thereby ensuring the normal operation of the UPS power supply system and realizing the seamless connection of the backup power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects, and advantages of the present application will become more apparent:

[0023] Figure 1 FIG. [FIG. NUMBER] is a schematic structural diagram of a UPS power supply system provided by an embodiment of the present application;

[0024] Figure 2 FIG. [FIG. NUMBER] is a specific structural diagram of the UPS power supply system provided by an embodiment of the present application;

[0025] Figure 3 FIG. [FIG. NUMBER] is a schematic structural diagram of an online UPS power supply system applied to the weak current system of urban rail transit implemented by using the solution in the embodiment of the present application;

[0026] The same or similar reference numerals in the drawings represent the same or similar components. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present application will be further described in detail below with reference to the drawings.

[0028] In a typical configuration of the present application, the terminal, the devices of the service network, and the trusted party all include one or more processors (CPUs), input / output interfaces, network interfaces, and memories.

[0029] The memory may include non-permanent memory in the computer-readable medium, random access memory (RAM), and / or non-volatile memory in the form of read-only memory (ROM) or flash memory (flash RAM). The memory is an example of the computer-readable medium.

[0030] A computer-readable medium includes permanent and non-permanent, removable and non-removable media that can implement information storage by any method or technology. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette tapes, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to store information accessible by a computing device. As defined herein, a computer-readable medium does not include transitory media such as modulated data signals and carrier waves.

[0031] Figure 1 The structure of a UPS power supply system provided by an embodiment of the present application is shown, which at least includes a main power supply 100, a backup power supply 200, a control module 300, and a monitoring module 400. The positive output terminal 100+ of the main power supply 100 is connected to the positive output terminal 200+ of the backup power supply and is connected to the positive pole 500+ of the load output 500. The negative output terminal 100- of the main power supply is connected to the negative output terminal 200- of the backup power supply through the control module 300 and is connected to the negative pole 500- of the load output 500.

[0032] The control module 300 is used to control the connection state between the negative output terminal 100- of the main power supply and the negative output terminal 200- of the backup power supply. In the normal working state of this UPS power supply system, the connection state between the negative output terminal 100- of the main power supply and the negative output terminal 200- of the backup power supply should be connected.

[0033] The monitoring module 400 is connected to the control module 300 and is at least used to detect the connection state and current value between the negative output terminal 100- of the main power supply and the negative output terminal 200- of the backup power supply. Among them, by detecting the connection state between the negative output terminal 100- of the main power supply and the negative output terminal 200- of the backup power supply, the monitoring module 400 can be used to determine whether the backup power supply 200 in this UPS power supply system has been normally connected, and by detecting the current value, the charge and discharge management of the backup power supply 200 can be carried out according to a preset charge and discharge management scheme.

[0034] In an actual scenario, the UPS power supply system can be applied to the weak current system of urban rail transit. Different from the traditional UPS power supply system that switches to the backup power supply for power supply after detecting an abnormal main power supply, the UPS power supply system provided in this application has the backup power supply normally closed within the main power supply system, omitting the switching link after the main power supply is abnormal. When the main power supply loses output due to an abnormality, the backup power supply can seamlessly connect without switching, meeting the continuous working requirements of electrical equipment with high requirements for power stability. At the same time, it avoids the impact on the electrical equipment generated during the power supply switching process and better protects the relevant electrical equipment. Therefore, it can be better applied to scenarios with high requirements for power stability such as the weak current system of urban rail transit, ensuring that the rail transit equipment can stably maintain power supply even when the main power supply is lost.

[0035] In some embodiments of the present application, the control module may at least include a battery switch and a DC contactor. The negative output terminal of the main power supply is connected to the negative output terminal of the backup power supply through the serially arranged battery switch and DC contactor. By closing and opening the battery switch and the DC contactor, the connection state between the negative output terminal of the main power supply and the negative output terminal of the backup power supply can be controlled. Among them, when the battery switch or the DC contactor is disconnected, the connection state between the negative output terminal of the main power supply and the negative output terminal of the backup power supply is disconnected, and when both the battery switch and the DC contactor are closed, the connection state between the negative output terminal of the main power supply and the negative output terminal of the backup power supply is connected.

[0036] In some other embodiments of the present application, the control module may further include a shunt. At this time, the specific structure of the UPS power supply system can be as Figure 2 shown. Among them, the shunt 320 of the control module is serially arranged with the battery switch 310 and the DC contactor 330 between the negative output terminal 100- of the main power supply 100 and the negative output terminal 200- of the backup power supply 200. The monitoring module 400 is used to sample the current between the negative output terminal 100- of the main power supply and the negative output terminal 200- of the backup power supply through the shunt 100 to obtain the current value. The rest of the structure in this UPS power supply system is the same as that in Figure 1 and will not be elaborated here.

[0037] In the UPS power supply system provided by the embodiments of the present application, a host computer may also be included. The host computer is connected to the monitoring module and can obtain the data detected by the monitoring module and perform data backup. For example, it can back up relevant content during its own operation process, and can also back up relevant parameters during the operation process of the UPS power supply system, including the shutdown time of this work, the charge and discharge times of the battery, communication logs, etc. Thus, it is convenient for the operation and maintenance personnel to troubleshoot according to the backup data when needed.

[0038] Based on the above UPS power supply system, an embodiment of the present application further provides a control method for the UPS power supply system to control the above UPS power supply system. The control method includes: when the battery switch 310 of the control module is closed, close the DC contactor of the control module and attempt to connect to the backup power supply 200. At this time, the monitoring module can detect the connection state between the negative output terminal of the main power supply and the negative output terminal of the backup power supply. If the connection state is connected, it means that the backup power supply 200 has been normally connected and the UPS power supply system can operate normally. At this time, charge and discharge management of the backup power supply can be performed according to the detected current value. If the detected connection state is disconnected, it means that the backup power supply 200 has not been normally connected and the UPS power supply system cannot operate normally. At this time, the DC contactor needs to be disconnected and then closed again after a preset interval. After reconnecting to the backup power supply 200, the connection state between the negative output terminal of the main power supply and the negative output terminal of the backup power supply is detected again until the preset number of times is reached.

[0039] Among them, the preset interval and the preset number of times involved in this solution can be set according to the requirements of the actual application scenario, and a suitable value can be selected. For example, the preset interval can be set to 2 seconds, 3 seconds, etc., and the preset number of times can be set to 3 times, 5 times, etc.

[0040] When the connection state between the negative output terminal of the main power supply and the negative output terminal of the backup power supply is detected again until the preset number of times is reached, if the connection state between the negative output terminal of the main power supply and the negative output terminal of the backup power supply is still detected as disconnected, it can be determined that the backup power supply has failed and cannot be normally connected. At this time, the monitoring module can report the information of the backup power supply failure to the upper computer, so that the upper computer can back it up after obtaining this information, facilitating the maintenance personnel to quickly troubleshoot the cause of the failure based on this information.

[0041] In the actual scenario, the battery switch of the control module can be a manual switch manually controlled by the maintenance personnel to manually control whether the backup power supply is connected to the UPS power supply system. That is, only after the battery switch is closed, subsequent other detections and closing of the DC contactor to attempt to connect to the backup power supply will be performed. Thus, in some embodiments of the present application, when the battery switch of the control module is not closed, the monitoring module can report the information that the backup power supply is not in place to the upper computer, and will not close the DC contactor to attempt to connect to the backup power supply.

[0042] In some embodiments of the present application, the main power supply includes a mains power supply and an AC-DC rectification module. The mains power supply is rectified by the AC-DC rectification module to output a DC output that meets the system requirements. For example, in this embodiment, the AC-DC rectification module can receive the input of the AC mains power supply and output a 48V DC output at the same time. The backup power supply is a battery module that outputs a DC output that meets the system requirements, such as providing a 48V DC output. In an actual scenario, in order to provide suitable outputs to various different electrical devices, the output end of the UPS power supply system may include a DC-DC voltage conversion module to facilitate the provision of various different specifications of DC outputs. For example, in the solution of this embodiment, the DC-DC voltage conversion module can provide different specifications of DC outputs such as 48V / 4A, 24V / 24A, 12V / 20A, 5.3V / 8A, and 5.3V / 3A according to the requirements of the actual application scenario.

[0043] Figure 3 Figure 4 shows an online UPS power supply system applied to the weak current system of urban rail transit implemented by the solution in the embodiment of the present application, including a monitoring module 400, an AC-DC rectification module 110, a control module 300, a battery module 210, a host computer 600, an indicator light 700, and a DC-DC voltage conversion module 520.

[0044] The power supply of this online UPS power supply system uses AC mains power as the main power supply, and the backup power supply is a 48V battery module. The monitoring module cooperates with the control system to control the access of the battery and perform charge and discharge management, and can still maintain a stable DC standby output when the AC mains power is abnormal. Among them, the load output in this solution supplies power to the load 510 and the DC-DC voltage conversion module 520, and the battery module 210 uses a 48V / 4Ah battery pack. The host computer 600 can obtain the data detected by the monitoring module and perform data backup, which is convenient for maintenance personnel to troubleshoot according to the backup data when needed. The indicator light 700 can prompt various different states during the operation of the UPS power supply system, which is convenient for users to more conveniently understand the current operation state of the UPS power supply system.

[0045] Specifically, the system input of this online UPS power supply system is: AC mains power and a 48V / 4Ah battery pack (42VDC to 50VDC, floating charge up to 54VDC).

[0046] The system output is: 48V / 4A, 24V / 24A, 12V / 20A, 5.3V / 8A, 5.3V / 3A.

[0047] Communication interface: Remote control, RS232 interface.

[0048] Control system: The positive output terminal BAT+ of the battery pack is connected to the positive output terminal DC48+ of the AC-DC rectification module and the positive DC+ of the load output. When the mains power is normal and present, it is determined whether to connect the battery pack by sampling the signal of the battery switch; by controlling the opening or closing of the DC contactor, the connection state between the negative output terminal BAT- of the battery pack and the negative output terminal DC48- of the AC-DC rectification module is controlled, thereby controlling the connection of the battery; the shunt is used to detect the current value of the battery charging and discharging. Among them, DC48V± only represents the terminal of the output voltage of the AC-DC rectification module, not its specific voltage value, and the specific voltage value can be set according to the needs of the actual scenario, for example, it can be 42VDC to 54VDC.

[0049] In the above online UPS power supply system, the AC-DC rectification module completes the conversion of the AC mains power. The input voltage range can be 90VAC to 264VAC, and the output voltage range can be 42VDC to 54VDC.

[0050] During the working process, corresponding processing will be performed for the following situations:

[0051] 1) The battery switch is not closed and the mains power is normal: The monitoring module reports information about the battery not being in place to the upper computer, and the UPS power supply system provides a 48V DC output.

[0052] 2) The battery switch is closed and the mains power is normal: The AC-DC rectification module can step down to 42VDC, and at the same time can control the DC contactor to close and try to connect the battery. After detecting the connection of the battery, within a certain range, the output voltage of the AC-DC rectification module varies according to the battery voltage for battery charging management. If the connection of the battery is not detected, after disconnecting the DC contactor, it pauses for 3 seconds and then closes again to re-detect the connection of the battery. After three consecutive cycles without detecting the connection of the battery, information about the battery failure is reported to the upper computer.

[0053] 3) The battery switch is closed and the mains power is abnormal: When the battery has been normally connected when the mains power is normal, if the normal output of the mains power is suddenly lost, since the positive output terminal BAT+ of the battery pack and the positive output terminal DC48+ of the AC-DC rectification module are in a continuously connected state at this time, and the negative output terminal BAT- of the battery pack and the negative output terminal DC48- of the AC-DC rectification module are also in a continuously connected state, the positive DC+ and negative DC- of the load output are simultaneously connected to the output terminals of the AC-DC rectification module and the battery pack. When the output supply of the AC-DC rectification module is lost, the battery pack will provide uninterrupted load.

[0054] Therefore, the solution of the embodiment of the present application can improve the reliability, availability, and maintainability of the UPS power supply system. It can simplify the design of the power supply box and reduce the volume structure on the premise of providing multiple outputs for various electrical equipment in the weak current system of urban rail transit. Different from the traditional UPS power supply system that switches to the backup power supply for power supply after detecting an abnormality in the main power supply, the UPS power supply system provided by the present application has the backup power supply normally closed in the main power supply system, omitting the switching link after the main power supply abnormality. When the main power supply loses output due to an abnormality, the backup power supply can seamlessly connect without switching, meeting the continuous operation requirements of electrical equipment with high requirements for power stability, and at the same time avoiding the impact on electrical equipment generated during the power supply switching process, better protecting the relevant electrical equipment. Therefore, it can be better applied to scenarios with high requirements for power stability such as the weak current system of urban rail transit, ensuring that rail transit equipment can stably maintain power supply even when the main power supply is lost.

[0055] In addition, when applied to the weak current system of urban rail transit, the UPSs of each weak current system in the same station, depot, and control center can be integrated respectively. Considering the equipment capacity and installation area comprehensively, the UPSs can be uniformly managed, monitored, operated, maintained, and serviced. Moreover, since the solution in the embodiment of the present application uses weak current batteries for uninterrupted power supply, the backup power supply can be directly equipped inside the equipment of the UPS power supply system, avoiding the backup power storage of the dedicated site high-voltage power station in the traditional solution. Therefore, the effective use of space can be realized, and the product volume can be greatly reduced. At the same time, it can also achieve short-term uninterrupted power supply for each weak current system of urban rail transit, facilitating the uploading of backup data, troubleshooting, etc.

[0056] It should be noted that the present application can be implemented in software and / or a combination of software and hardware. For example, it can be implemented using an application-specific integrated circuit (ASIC), a general-purpose computer, or any other similar hardware device. In one embodiment, the software program of the present application can be executed by a processor to implement the above-mentioned steps or functions. Similarly, the software program of the present application (including related data structures) can be stored in a computer-readable recording medium, such as a RAM memory, a magnetic or optical drive, or a floppy disk and similar devices. In addition, some steps or functions of the present application can be implemented using hardware, for example, as a circuit that cooperates with the processor to execute each step or function.

[0057] In addition, a part of this application can be applied as a computer program product, such as computer program instructions. When executed by a computer, through the operation of this computer, it can call or provide the methods and / or technical solutions according to this application. The program instructions for calling the methods of this application may be stored in a fixed or removable recording medium, and / or transmitted through a data stream in a broadcast or other signal-bearing medium, and / or stored in the working memory of a computer device that runs according to the program instructions. Here, an embodiment according to this application includes a device, which includes a memory for storing computer program instructions and a processor for executing the program instructions. When the computer program instructions are executed by the processor, it triggers the device to run based on the methods and / or technical solutions according to the foregoing multiple embodiments of this application.

[0058] For those skilled in the art, it is obvious that this application is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of this application, this application can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of this application is defined by the appended claims rather than the above description. Therefore, it is intended to cover all changes that fall within the meaning and scope of the equivalent elements of the claims in this application. Any reference signs in the claims should not be regarded as limiting the claimed rights. In addition, obviously, the word "including" does not exclude other units or steps, and the singular does not exclude the plural. The multiple units or devices stated in the device claims can also be implemented by one unit or device through software or hardware. First, second, etc. are used to represent names and do not represent any specific order.

Claims

1. A UPS power supply system, characterized in that: Including main power supply, backup power supply, control module and monitoring module; The positive output terminal of the main power supply is connected to the positive output terminal of the backup power supply and is connected to the positive pole of the load output. The negative output terminal of the main power supply is connected to the negative output terminal of the backup power supply through a control module and is connected to the negative pole of the load output. The control module is used to control the connection status between the negative output terminal of the main power supply and the negative output terminal of the backup power supply. The monitoring module is connected to the control module and is at least used to detect the connection status and current value between the negative output terminal of the main power supply and the negative output terminal of the backup power supply.

2. The UPS power supply system according to claim 1, characterized in that: The control module at least includes a battery switch and a DC contactor; The negative output terminal of the main power supply is connected to the negative output terminal of the backup power supply through the battery switch and the DC contactor arranged in series. When the battery switch or the DC contactor is disconnected, the connection state between the negative output terminal of the main power supply and the negative output terminal of the backup power supply is disconnected.

3. The UPS power supply system according to claim 2, characterized in that: The control module also includes a shunt, which is arranged in series with a battery switch and a DC contactor between the negative output terminal of the main power supply and the negative output terminal of the backup power supply. The monitoring module is used to sample the current between the negative output terminal of the main power supply and the negative output terminal of the backup power supply through the shunt to obtain the current current value.

4. The UPS power supply system according to claim 1, characterized in that: The UPS power supply system also includes a host computer, which is connected to the monitoring module to obtain data detected by the monitoring module and perform data backup.

5. The UPS power supply system according to claim 1, characterized in that: The main power supply includes a mains power supply and an AC-DC rectifier module. The mains power supply is rectified by the AC-DC rectifier module to output a DC output that meets system requirements.

6. The UPS power supply system according to claim 1, characterized in that: The backup power supply is a battery module that outputs a DC output that meets system requirements.

7. The UPS power supply system according to claim 1, characterized in that: The UPS power supply system is applied to the weak current system of urban rail transit.

8. A control method for a UPS power system, characterized in that: Used to control the UPS power supply system according to any one of claims 1 to 6, the control method comprising: When the battery switch of the control module is closed, closing the DC contactor of the control module; The monitoring module detects the connection status between the negative output terminal of the main power supply and the negative output terminal of the backup power supply. If the connection status is connected, the backup power supply is charged and discharged according to the detected current value; if the connection status is disconnected, the DC contactor is disconnected and closed again after a preset interval, and the connection status between the negative output terminal of the main power supply and the negative output terminal of the backup power supply is re-detected until a preset number of times is reached.

9. The control method according to claim 7, characterized in that: Re-detecting the connection status between the negative output terminal of the main power supply and the negative output terminal of the backup power supply until a preset number of times is reached, further comprising: The monitoring module reports the backup power failure information to the host computer.

10. The control method according to claim 7, characterized in that: When the battery switch of the control module is not closed, the monitoring module reports to the host computer that the backup power supply is not in place.

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