Uninterruptible power supply, short circuit detection method, device and equipment of switching device

Abstract

The application discloses an uninterrupted power supply, a short-circuit detection method, device and equipment of a switching device, which are used for detecting the short circuit of the switching device connected between the positive and negative electrodes of a battery in the uninterrupted power supply, avoiding the failure of the uninterrupted power supply caused by the short circuit of the switching device, and improving the reliability of the uninterrupted power supply. The uninterrupted power supply comprises a rectifying module, a battery and a charging and discharging module. The rectifying module is connected between commercial power and a bus and comprises a first rectifying submodule and a second rectifying submodule. The charging and discharging module is connected between the battery and the bus and at least comprises a first switching device connected between the positive and negative electrodes of the battery and a second switching device connected between the negative electrode of the battery and the negative electrode of the bus. The positive electrode of the battery is connected with an alternating current port of the first rectifying submodule through a relay, the negative electrode of the battery is connected with an alternating current port of the second rectifying submodule through a relay, and a capacitor is connected between the positive and negative electrodes of the battery.

Description

Technical Field

[0001] This application relates to the field of power supply technology, and in particular to an uninterruptible power supply, a short-circuit detection method, apparatus and equipment for switching devices. Background Technology

[0002] With the advancement of uninterruptible power supplies (UPS), high-power UPS have emerged, resulting in a greater number of internal components, especially switching devices.

[0003] To ensure the safety of uninterruptible power supplies (UPS), it is necessary to check for short circuits in the internal components before UPS operation. For example... Figure 1 As shown, a typical uninterruptible power supply circuit topology mainly includes: a rectifier module 10 connected between the mains power and the bus, and a charging / discharging module 11 connected between the battery module and the bus.

[0004] Existing detection methods typically only check for short circuits in the switching devices of the rectifier module 10, neglecting to detect short circuits in the switching devices of the charge / discharge module 11, posing a certain safety hazard. For example, if the switching device Q0 connected between the positive and negative terminals of the battery in the charge / discharge module 11 is short-circuited, Q0 will connect the positive and negative terminals of the battery when relays K1 and K2 are closed, resulting in a huge current in the circuit and damaging other components in the uninterruptible power supply. Summary of the Invention

[0005] This application provides a method, apparatus, device, and medium for short-circuit detection of an uninterruptible power supply (UPS) and switching devices, which are used to detect short circuits in the switching devices connected between the positive and negative terminals of the battery within the UPS, thereby preventing UPS failures caused by short circuits in the switching devices and improving the reliability of the UPS.

[0006] In a first aspect, embodiments of this application provide an uninterruptible power supply, comprising: a rectifier module, a battery, and a charging / discharging module, wherein,

[0007] The rectifier module is connected between the mains power and the busbar, and includes a first rectifier submodule and a second rectifier submodule;

[0008] The charging and discharging module is connected between the battery and the busbar, and includes at least: a first switching device connected between the positive and negative terminals of the battery, and a second switching device connected between the negative terminal of the battery and the negative terminal of the busbar;

[0009] The positive terminal of the battery is connected to the AC port of the first rectifier submodule via a relay, and the negative terminal of the battery is connected to the AC port of the second rectifier submodule via a relay. A capacitor is connected between the positive and negative terminals of the battery.

[0010] In the aforementioned uninterruptible power supply (UPS), the positive terminal of the battery is connected to the AC port of the first rectifier submodule via relays, and the negative terminal of the battery is connected to the AC port of the second rectifier submodule via relays. This allows the UPS to be turned on after precharging is complete and before the rectifier modules are connected to the mains power. This enables the second switching device and at least one target switching device in the first rectifier submodule (the switching device in the first rectifier submodule connected to the midpoint of the busbar) to conduct, and the relay between the positive terminal of the battery and the first rectifier submodule to close. Then, by detecting whether there is current in the branch where the first switching device is located, a short circuit detection is performed on the first switching device, thereby avoiding UPS failure caused by short circuit of the switching device and improving the reliability of the UPS.

[0011] In one possible implementation, one end of the first rectifier submodule is connected to the positive terminal of the bus, and the other end is connected to the midpoint of the bus; one end of the second rectifier submodule is connected to the midpoint of the bus, and the other end is connected to the negative terminal of the bus.

[0012] In one possible implementation, a relay is connected between the capacitor and the first common terminal of the first switching device and the positive terminal of the battery, and between the capacitor and the second common terminal of the first switching device and the negative terminal of the battery.

[0013] In one possible implementation, the charging and discharging module further includes a third switching device connected between the positive terminal of the battery and the positive terminal of the bus.

[0014] Secondly, embodiments of this application provide a short-circuit detection method for a switching device, applied to the uninterruptible power supply provided in the first aspect of embodiments of this application, the method comprising:

[0015] After the uninterruptible power supply is pre-charged and before the rectifier module is connected to the mains power, at least one target switching device in the second switching device and the first rectifier submodule is controlled to be turned on, and the relay between the positive terminal of the battery and the first rectifier submodule is controlled to be closed. The target switching device is the switching device in the first rectifier submodule that is connected to the midpoint of the bus.

[0016] If current is detected in the branch where the first switching device is located, it is determined that the first switching device is short-circuited.

[0017] In the above method, after the uninterruptible power supply (UPS) is pre-charged and before the rectifier module is connected to the mains power, at least one target switching device in the second switching device and the first rectifier submodule is turned on, and the relay between the positive terminal of the battery and the first rectifier submodule is closed. The target switching device is the switching device in the first rectifier submodule connected to the midpoint of the bus. Then, if current is detected in the branch where the first switching device is located, it is determined that the first switching device is short-circuited. Compared with the prior art, this method realizes short-circuit detection of the switching device connected between the positive and negative terminals of the battery in the UPS, avoids UPS failure caused by short circuit of the switching device, and improves the reliability of the UPS.

[0018] In one possible implementation, the method further includes:

[0019] If no current is detected in the branch where the first switching device is located, the first switching device is determined to be normal.

[0020] Thirdly, embodiments of this application provide a short-circuit detection device for a switching device, applied to the uninterruptible power supply provided in the first aspect of embodiments of this application, the device comprising:

[0021] The control unit is configured to control at least one target switching device in the second switching device and the first rectifier submodule to be turned on after the uninterruptible power supply is precharged and before the rectifier module is connected to the mains power, and to control the relay between the positive terminal of the battery and the first rectifier submodule to be closed, wherein the target switching device is the switching device in the first rectifier submodule connected to the midpoint of the bus.

[0022] The detection unit is used to determine that the first switching device is short-circuited when a current is detected in the branch where the first switching device is located.

[0023] In one possible implementation, the detection unit is further configured to:

[0024] If no current is detected in the branch where the first switching device is located, the first switching device is determined to be normal.

[0025] Fourthly, embodiments of this application provide an electronic device, the device including a processor and a memory, the memory being used to store a program executable by the processor, the processor being used to read the program in the memory and execute the method described in any one of the first aspects.

[0026] Fifthly, embodiments of this application also provide a computer storage medium having a computer program stored thereon, which, when executed by a processor, is used to implement the steps of the method described in the first aspect above.

[0027] In a sixth aspect, this application provides a computer program product comprising: computer program code, which, when run on a computer, causes the computer to perform the method described in any one of the first aspects.

[0028] For the technical effects that may be achieved in each of the third, fourth, fifth, and sixth aspects mentioned above, please refer to the description of the technical effects that may be achieved in the various possible solutions for the second aspect mentioned above, which will not be repeated here. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A schematic diagram of the circuit topology of an uninterruptible power supply provided in an embodiment of this application;

[0031] Figure 2 This application provides a schematic diagram of the current flow direction when a short-circuit fault occurs in a switching device of an uninterruptible power supply.

[0032] Figure 3 A schematic diagram of the circuit topology of another uninterruptible power supply provided in an embodiment of this application;

[0033] Figure 4 A schematic flowchart illustrating a short-circuit detection method for a switching device provided in an embodiment of this application;

[0034] Figure 5 A schematic diagram of the current flow direction in an uninterruptible power supply when the switching device does not experience a short-circuit fault, provided as an embodiment of this application;

[0035] Figure 6 A schematic diagram of the current flow direction when a short-circuit fault occurs in a switching device of another uninterruptible power supply provided in an embodiment of this application;

[0036] Figure 7 A schematic flowchart illustrating the specific implementation process of a short-circuit detection method for a switching device provided in this application embodiment;

[0037] Figure 8 A schematic diagram of the structure of a short-circuit detection device for a switching device provided in an embodiment of this application;

[0038] Figure 9 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0041] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0042] Before introducing the short-circuit detection scheme for the uninterruptible power supply and its switching devices provided in the embodiments of this application, the technical background of the embodiments of this application will be described in detail for ease of understanding.

[0043] With the advancement of uninterruptible power supplies (UPS), high-power UPS have emerged, resulting in a greater number of internal components, especially switching devices.

[0044] To ensure the safety of uninterruptible power supplies (UPS), it is necessary to check for short circuits in the internal components before UPS operation. For example... Figure 1 As shown, a typical uninterruptible power supply circuit topology mainly includes: a rectifier module 10 connected between the mains power and the bus, and a charging / discharging module 11 connected between the battery module and the bus.

[0045] Existing detection methods typically only check for short circuits in the switching devices of the rectifier module 10, neglecting to check for short circuits in the switching devices of the charging / discharging module 11, posing a certain safety hazard. For example, if... Figure 2 As shown, if the switching device Q0 connected between the positive and negative terminals of the battery in the charging / discharging module 11 is short-circuited, then when relays K1 and K2 are closed, Q0 will connect the positive and negative terminals of the battery, resulting in... Figure 2A huge current appeared in the circuit shown, damaging other components in the uninterruptible power supply.

[0046] In view of this, embodiments of this application provide an uninterruptible power supply (UPS), a short-circuit detection method, apparatus, device, and medium for switching devices. The positive terminal of the battery is connected to the AC port of a first rectifier submodule via relays, and the negative terminal of the battery is connected to the AC port of a second rectifier submodule via relays. This allows the UPS to be turned on after pre-charging is complete and before the rectifier modules are connected to the mains power. At least one target switching device (the switching device in the first rectifier submodule connected to the midpoint of the busbar) in both the second and first rectifier submodules can be turned on. The relay between the positive terminal of the battery and the first rectifier submodule is also closed. Then, by detecting whether current exists in the branch where the first switching device is located, a short-circuit detection is performed on the first switching device, thereby preventing UPS failures caused by short circuits in the switching device and improving the reliability of the UPS.

[0047] It should be noted that the embodiments of this application use software control to coordinate the control of the rectifier module and the charging and discharging module, thereby detecting whether a specified switching device (the switching device connected between the positive and negative terminals of the battery in the uninterruptible power supply) is short-circuited, avoiding blindly closing the battery relay and causing greater failures, thus improving the reliability of the uninterruptible power supply.

[0048] After introducing the background technology of the embodiments of this application, the short-circuit detection scheme of the uninterruptible power supply and its switching device provided by the embodiments of this application will be described in detail below with reference to specific embodiments.

[0049] See Figure 3 As shown, it is a structural schematic diagram of an uninterruptible power supply in an embodiment of this application, including: a rectifier module 30, a battery 31, and a charging and discharging module 32.

[0050] The rectifier module 30 is connected between the mains power and the busbar, and includes a first rectifier submodule 301 and a second rectifier submodule 302.

[0051] The charging and discharging module 32 is connected between the battery 31 and the bus, and includes at least: a first switching device 321 connected between the positive and negative terminals of the battery 31, and a second switching device 322 connected between the negative terminal of the battery 31 and the negative terminal of the bus.

[0052] The positive terminal of battery 31 is connected to the AC port of the first rectifier submodule 301 via relays (relays 33, 34, and 35), and the negative terminal of battery 31 is connected to the AC port of the second rectifier submodule 302 via relays (relays 36, 37, and 38). A capacitor 39 is connected between the positive and negative terminals of battery 31.

[0053] In this circuit, one end of the first rectifier submodule 301 is connected to the positive terminal of the bus, and the other end is connected to the midpoint of the bus (i.e., Figure 3 (N point in the middle), one end of the second rectifier submodule 302 is connected to the midpoint of the bus, and the other end is connected to the negative terminal of the bus.

[0054] In specific implementation, relays are connected between the first common terminal of capacitor 39 and the first switching device 321 and the positive terminal of battery 31, and between the second common terminal of capacitor 39 and the first switching device 321 and the negative terminal of battery 31. Specifically, a relay 40 is connected between the first common terminal of capacitor 39 and the first switching device 321 and the positive terminal of battery 31, and a relay 41 is connected between the second common terminal of capacitor 39 and the first switching device 321 and the negative terminal of battery 31.

[0055] In practical applications, the charging and discharging module 32 further includes a third switching device 323 connected between the positive terminal of the battery 31 and the positive terminal of the bus. Of course, the charging and discharging module 32 may also include other components such as inductors, and this embodiment does not limit this.

[0056] In some embodiments, the uninterruptible power supply provided in this application may also include a current sensor 42 and a current sensor 43 respectively provided on the connection branch of the capacitor 39 and the first switching device 321, for detecting whether there is current in the corresponding branch.

[0057] The structure of the uninterruptible power supply provided in the embodiments of this application has been described above. The following will use... Figure 3 Taking the uninterruptible power supply shown as an example, the short-circuit detection method of the switching device provided in the embodiments of this application will be described in detail.

[0058] See Figure 4 The diagram shown is a flowchart of a short-circuit detection method for a switching device according to an embodiment of this application. It is applied to the uninterruptible power supply (UPS) provided in the above embodiments of this application. The executing entity can be the controller in the UPS. The specific implementation flow of this method is as follows: S401-S402:

[0059] S401, after the uninterruptible power supply is pre-charged and before the rectifier module is connected to the mains power, controls at least one target switching device in the second switching device and the first rectifier submodule to be turned on, and controls the relay between the positive terminal of the battery and the first rectifier submodule to be closed. The target switching device is the switching device in the first rectifier submodule that is connected to the midpoint of the bus.

[0060] In specific implementation, such as Figure 5As shown, after the mains switch is closed, with the mains power on, the voltage of the positive and negative bus capacitors C1 and C2 increases under the action of the pre-charging circuit. Before the rectifier module 30 is connected to the mains power, at least one target switch device in the second switch device 322 and the first rectifier submodule 301 is turned on, and the relays (i.e., relays 33, 34, and 35) between the positive terminal of the battery and the first rectifier submodule are closed. The target switch device is the switch device in the first rectifier submodule 301 connected to the midpoint of the bus, i.e. Figure 5 The switching devices Q1, Q2 and Q3 are shown in the figure.

[0061] In other embodiments of this application, when one or more of the control switching devices Q1, Q2 and Q3 are in the on state, the closing of relays 33, 34 and 35 may also vary depending on the on state of the control switching devices Q1, Q2 and Q3.

[0062] Specifically, when control switch Q1 is on, relay 33 can be closed; if control switch Q1 is off, relay 33 can remain open. When control switch Q2 is on, relay 34 can be closed; if control switch Q2 is off, relay 34 can remain open. When control switch Q3 is on, relay 35 can be closed; if control switch Q3 is off, relay 35 can remain open.

[0063] It should be noted that if the uninterruptible power supply is equipped with relays 40 and 41, then relay 40 will be closed.

[0064] At this time, if the first switching device 321 is not short-circuited, then taking the switching device Q3 as the conducting device as an example, the current loop is (e.g.) Figure 5 (As shown by the dashed line): From the midpoint N of the busbar → switching device Q3 → anti-parallel diode of switching device Q4 → inductor L1 → relay 35 → relay 40 → capacitor 39 → current sensor 43 → inductor L2 → second switching device 322 → negative terminal of the busbar. No current flows through the branch where the first switching device 321 is located, and the current sensor 42 cannot detect any current. In other words, if the first switching device 321 is not short-circuited, no current flows through the branch where the first switching device 321 is located.

[0065] If the first switching device 321 is short-circuited, taking the example of switching device Q3 being on, then as follows: Figure 6 As shown, the current loop is (as shown in the figure). Figure 6(As shown by the dashed line): From the midpoint N of the busbar → switching device Q3 → anti-parallel diode of switching device Q4 → inductor L1 → relay 35 → relay 40 → current sensor 42 → inductor L3 → first switching device 321 → second switching device 322 → negative terminal of the busbar. Current flows through the branch containing the first switching device 321, and the current sensor 42 can detect the current. In other words, if the first switching device 321 is short-circuited, current flows through the branch containing the first switching device 321.

[0066] Therefore, in specific implementation, after controlling at least one target switching device in the second switching device and the first rectifier submodule to be turned on, and controlling the relay between the positive terminal of the battery and the first rectifier submodule to be closed, the presence of current in the branch where the first switching device is located can be detected by the current sensor 42, thereby determining whether the first switching device is short-circuited.

[0067] S401, if current is detected in the branch where the first switching device is located, it is determined that the first switching device is short-circuited.

[0068] Conversely, if no current is detected in the branch where the first switching device is located, it is determined that the first switching device is normal.

[0069] Specifically, detecting whether there is current in the branch where the first switching device is located can be done by setting a current sensor in that branch, such as... Figure 5 and Figure 6 The current sensor 42 is shown in the figure.

[0070] It should be noted that in other embodiments of this application, a short circuit fault may be determined in the first switching device 321 when the current sensor 42 detects current and the current sensor 43 does not detect current; and the first switching device 321 may be determined to be normal when the current sensor 42 does not detect current and the current sensor 43 detects current.

[0071] The following is based on Figure 6 Taking the uninterruptible power supply shown as an example, combined with Figure 7 The specific implementation process of the short-circuit detection method for switching devices provided in the embodiments of this application will be described in detail.

[0072] like Figure 7 As shown, the specific implementation flow of the short-circuit detection method for switching devices provided in this application includes:

[0073] S701 controls the closing of the mains power switch, allowing the uninterruptible power supply to precharge.

[0074] S702, after pre-charging is complete, control switch Q3 and second switch 322 are turned on, and control relays 35 and 40 are closed.

[0075] S703: Determine whether the current sensor 42 has detected current. If yes, execute S704; otherwise, execute S705.

[0076] S704, if the current sensor 42 detects current, it is determined that the first switching device 321 has a short circuit fault.

[0077] S705, if the current sensor 42 does not detect current, it is determined that the first switching device 321 is normal.

[0078] Based on the same concept, this application embodiment also provides a short-circuit detection device for switching devices, which is applied to the uninterruptible power supply provided in this application embodiment. The principle of the device in solving the problem is similar to that of the method described above. The implementation of the device can refer to the implementation of the method, and the repeated parts will not be described again.

[0079] like Figure 8 As shown in the figure, this application provides a short-circuit detection device for a switching device, the device comprising:

[0080] Control unit 801 is used to control at least one target switching device in the second switching device and the first rectifier submodule to be turned on after the uninterruptible power supply is precharged and before the rectifier module is connected to the mains power, and to control the relay between the positive terminal of the battery and the first rectifier submodule to be closed. The target switching device is the switching device in the first rectifier submodule that is connected to the midpoint of the bus.

[0081] The detection unit 802 is used to determine that the first switching device is short-circuited when a current is detected in the branch where the first switching device is located.

[0082] In one possible implementation, the detection unit 802 is further configured to:

[0083] If no current is detected in the branch where the first switching device is located, the first switching device is determined to be normal.

[0084] Based on the same concept, this application also provides an electronic device. The principle of the device in solving the problem is similar to that of the method described above. The implementation of the device can refer to the implementation of the method, and the repeated parts will not be described again.

[0085] like Figure 9 As shown in the illustration, an electronic device provided in this application includes: a processor 901; and a memory 902 for storing executable instructions of the processor 901; wherein the processor 901 executes the executable instructions to perform the following steps:

[0086] After the uninterruptible power supply is pre-charged and before the rectifier module is connected to the mains power, at least one target switching device in the second switching device and the first rectifier submodule is turned on, and the relay between the positive terminal of the battery and the first rectifier submodule is closed. The target switching device is the switching device in the first rectifier submodule that is connected to the midpoint of the bus.

[0087] If current is detected in the branch where the first switching device is located, it is determined that the first switching device is short-circuited.

[0088] In one possible implementation, processor 901 is also configured to perform:

[0089] If no current is detected in the branch where the first switching device is located, the first switching device is determined to be normal.

[0090] Based on the same inventive concept, this disclosure provides a computer storage medium comprising: computer program code, which, when executed on a computer, causes the computer to perform a short-circuit detection method for any of the switching devices discussed above. Since the principle by which the computer storage medium solves the problem is similar to the short-circuit detection method for switching devices, the implementation of the computer storage medium can be found in the implementation of the method, and repeated details will not be elaborated further.

[0091] In specific implementation, computer storage media can include: Universal Serial Bus Flash Drive (USB), portable hard drive, Read-Only Memory (ROM), Random Access Memory (RAM), magnetic disk or optical disk, and other storage media that can store program code.

[0092] Based on the same inventive concept, this disclosure also provides a computer program product, which includes computer program code. When the computer program code is run on a computer, it causes the computer to execute a short-circuit detection method for any of the switching devices discussed above. Since the principle by which the above-described computer program product solves the problem is similar to that of the short-circuit detection method for switching devices, the implementation of the above-described computer program product can be referred to the implementation of the method, and repeated details will not be described again.

[0093] Computer program products may employ any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of readable storage media include: electrical connections having one or more wires, portable disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0094] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0095] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 Devices that specify the functions in one or more boxes.

[0096] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including an instruction device, which is implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0097] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process.Figure 1 One or more processes and / or boxes Figure 1 The steps of the functions specified in one or more boxes. Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, this application also intends to include such modifications and variations if they fall within the scope of the claims of this application and their equivalents.

Claims

1. An uninterruptible power supply, characterized in that, include: The rectifier module, battery, and charge / discharge module are included. The rectifier module is connected between the mains power and the busbar, and includes a first rectifier submodule and a second rectifier submodule; The charging and discharging module is connected between the battery and the busbar, and includes at least: a first switching device connected between the positive and negative terminals of the battery, and a second switching device connected between the negative terminal of the battery and the negative terminal of the busbar; The positive terminal of the battery is connected to the AC port of the first rectifier submodule via a relay, and the negative terminal of the battery is connected to the AC port of the second rectifier submodule via a relay. A capacitor is connected between the positive and negative terminals of the battery.

2. The uninterruptible power supply according to claim 1, characterized in that, One end of the first rectifier submodule is connected to the positive terminal of the bus, and the other end is connected to the midpoint of the bus. One end of the second rectifier submodule is connected to the midpoint of the bus, and the other end is connected to the negative terminal of the bus.

3. The uninterruptible power supply according to claim 1, characterized in that, A relay is connected between the capacitor and the first common terminal of the first switching device and the positive terminal of the battery, and between the capacitor and the second common terminal of the first switching device and the negative terminal of the battery.

4. The uninterruptible power supply according to claim 1, characterized in that, The charging and discharging module further includes a third switching device connected between the positive terminal of the battery and the positive terminal of the bus.

5. A short-circuit detection method for a switching device, applied to an uninterruptible power supply as described in any one of claims 1-4, characterized in that, The method includes: After the uninterruptible power supply is pre-charged and before the rectifier module is connected to the mains power, at least one target switching device in the second switching device and the first rectifier submodule is controlled to be turned on, and the relay between the positive terminal of the battery and the first rectifier submodule is controlled to be closed. The target switching device is the switching device in the first rectifier submodule that is connected to the midpoint of the bus. If current is detected in the branch where the first switching device is located, it is determined that the first switching device is short-circuited.

6. The method according to claim 5, characterized in that, The method further includes: If no current is detected in the branch where the first switching device is located, the first switching device is determined to be normal.

7. A short-circuit detection device for a switching device, applied to an uninterruptible power supply as described in any one of claims 1-4, characterized in that, The device includes: The control unit is configured to control at least one target switching device in the second switching device and the first rectifier submodule to be turned on after the uninterruptible power supply is precharged and before the rectifier module is connected to the mains power, and to control the relay between the positive terminal of the battery and the first rectifier submodule to be closed, wherein the target switching device is the switching device in the first rectifier submodule connected to the midpoint of the bus. The detection unit is used to determine that the first switching device is short-circuited when a current is detected in the branch where the first switching device is located.

8. The apparatus according to claim 7, characterized in that, The detection unit is also used for: If no current is detected in the branch where the first switching device is located, the first switching device is determined to be normal.

9. An electronic device, characterized in that, include: processor; A memory for storing processor-executable instructions; wherein the processor implements the steps of the method of claim 5 or 6 by executing the executable instructions.

10. A computer storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the method as described in claim 5 or 6.

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