UPS test circuit and device

Abstract

This invention provides a UPS testing circuit and apparatus. The UPS testing circuit includes: a UPS module under test (DUT) and a target UPS module; the input terminal of the DUT is connected to the power grid; the output terminal of the DUT is connected to the input terminal of the target UPS module; a bypass of the target UPS module is connected to the input terminal of the DUT; the target UPS module operates in self-aging mode; the DUT operates in power supply mode; the target UPS module acts as a load for the DUT to perform testing. This method utilizes the target UPS module as a load for the DUT and returns electrical energy to the power grid via a bypass, thereby reducing the power intake from the grid during UPS testing and achieving energy savings.

Description

Technical Field

[0001] This invention relates to the field of uninterruptible power supply technology, and more particularly to a UPS testing circuit and device. Background Technology

[0002] A UPS (Uninterruptible Power System) is a constant-voltage, constant-frequency power supply containing energy storage devices and primarily composed of an inverter. It is mainly used to provide uninterrupted power to single computers, computer network systems, or other power electronic equipment. When the mains input is normal, the UPS stabilizes the mains voltage and supplies it to the load; when the mains is interrupted, the UPS immediately uses its internal battery to convert the energy into 220V AC power and continue supplying it to the load, ensuring normal operation. UPS systems are becoming increasingly popular due to their uninterrupted power supply characteristics.

[0003] To ensure the quality of UPS products, a full-load operation test is required before the UPS leaves the factory. During the test, a dummy load is usually used to test the UPS, but this method will cause excessive energy consumption. Summary of the Invention

[0004] This invention provides a UPS testing circuit and device to solve the problem of excessive energy consumption caused by using a dummy load during UPS testing in the prior art.

[0005] In a first aspect, embodiments of the present invention provide a UPS test circuit, comprising:

[0006] The UPS module under test and the target UPS module;

[0007] The input terminal of the UPS module under test is connected to the power grid;

[0008] The output terminal of the UPS module under test is connected to the input terminal of the target UPS module, and the bypass of the target UPS module is connected to the input terminal of the UPS module under test.

[0009] The target UPS module operates in self-aging mode; the UPS module under test operates in power supply mode; the target UPS module acts as the load of the UPS module under test to perform testing on the UPS module under test.

[0010] In one possible implementation, the UPS test circuit further includes a load device;

[0011] The load device is connected to the output terminal of the UPS module under test.

[0012] In one possible implementation, the UPS module under test includes a first bypass relay, a first bypass unit, and a first main power unit;

[0013] The first main power unit includes a first inverter circuit and a first rectifier circuit;

[0014] The AC terminal of the first rectifier circuit is connected to the power grid, and the DC terminal of the first rectifier circuit is connected to the DC terminal of the first inverter circuit.

[0015] The first terminal of the first bypass relay is connected to the power grid, the second terminal of the first bypass relay is connected to the first terminal of the first bypass unit, and the second terminal of the first bypass unit is connected to the AC terminal of the first inverter circuit.

[0016] The first bypass relay is closed.

[0017] In one possible implementation, the target UPS module includes a second bypass relay, a second main circuit output relay, a second bypass unit, and a second main power unit;

[0018] The input terminal of the target UPS module is connected to the first terminal of the second main power unit, and the second terminal of the second main power unit is connected to the first terminal of the second main circuit output relay. The second terminal of the second main circuit output relay is the output terminal of the target UPS module.

[0019] The first terminal of the second bypass relay is connected to the input terminal of the UPS module under test, the second terminal of the second bypass relay is connected to the first terminal of the second bypass unit, and the second terminal of the second bypass unit is connected to the first terminal of the second main circuit output relay.

[0020] The first bypass relay is closed; the second main circuit relay is open.

[0021] In one possible implementation, the load device is an adjustable resistive load.

[0022] In one possible implementation, the target UPS module includes at least one;

[0023] The input terminals of each target UPS module are connected to the output terminals of the UPS module under test, and the bypass terminals of each target UPS module are connected to the input terminals of the UPS module under test.

[0024] In one possible implementation, the UPS module under test includes at least one;

[0025] The input terminals of each UPS module under test are connected to the power grid, and the output terminals of each UPS module under test are connected to the input terminals of the target UPS module. The bypass of the target UPS module is connected to the input terminals of each UPS module under test.

[0026] In one possible implementation, the second main power unit includes a second inverter circuit and a second rectifier circuit;

[0027] The AC terminal of the second rectifier circuit is the first terminal of the second main power unit, the DC terminal of the second rectifier circuit is connected to the DC terminal of the second inverter circuit, and the AC terminal of the second inverter circuit is the second terminal of the second main power unit.

[0028] Secondly, embodiments of the present invention provide a UPS testing device, including a controller and a UPS testing circuit as described in the first aspect above;

[0029] The controller is used to control the operation of the UPS test circuit.

[0030] In one possible implementation, the controller is also used to calculate and display the power characteristic parameters of the UPS module under test.

[0031] This invention provides a UPS testing circuit and apparatus. The UPS testing circuit includes a UPS module under test (DUT) and a target UPS module. The input terminal of the DUT is connected to the power grid. The output terminal of the DUT is connected to the input terminal of the target UPS module. A bypass of the target UPS module is connected to the input terminal of the DUT. The target UPS module operates in self-aging mode. The DUT operates in power supply mode. The target UPS module acts as a load for the DUT to perform testing. This method utilizes the target UPS module as a load for the DUT and returns electrical energy to the power grid via a bypass, thereby reducing the power intake from the grid during UPS testing and achieving energy savings. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the UPS test circuit provided in an embodiment of the present invention;

[0034] Figure 2This is a schematic diagram of a UPS test circuit provided in an embodiment of the present invention;

[0035] Figure 3 This is another specific circuit diagram of the UPS test circuit provided in the embodiment of the present invention;

[0036] Figure 4 This is another specific circuit diagram of the UPS test circuit provided in the embodiment of the present invention. Detailed Implementation

[0037] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0038] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0039] In existing technologies, full-load testing of UPS systems typically requires a dummy load of the same power rating as the UPS. This dummy load is usually resistive, and the electrical energy input to it is consumed. Since UPS systems are usually tested at the factory, the energy consumption for testing increases significantly with rising production volumes. To reduce energy consumption, some researchers utilize the self-aging function inherent in the UPS module itself, bypassing the input power back to the grid. This can greatly reduce energy loss. However, because the UPS module bypasses the input power, its output power and power factor are zero, making this method unsuitable for real-world UPS operating conditions and resulting in poor test performance.

[0040] To address the issue of high energy consumption during UPS testing while meeting the testing requirements of real-world UPS operating scenarios, this embodiment provides a UPS testing circuit. In this circuit, the output terminal of the UPS module under test is connected to the target UPS module, which is treated as the load of the UPS module under test. The target UPS module is controlled to operate in self-aging mode, and the power input to the target UPS module is returned to the power grid via a bypass, thereby reducing the energy consumption of UPS testing while simulating real-world UPS operating scenarios.

[0041] The following provides a detailed explanation of the specific structure of the UPS test circuit. Figure 1 This is a schematic diagram of the UPS test circuit provided in an embodiment of the present invention. Figure 1 As shown, the UPS test circuit includes:

[0042] UPS module under test 100 and target UPS module 200;

[0043] The input terminal In1 of the UPS module under test 100 is connected to the power grid;

[0044] The output terminal Out1 of the UPS module under test 100 is connected to the input terminal In2 of the target UPS module 200, and the bypass 2 of the target UPS module 200 is connected to the input terminal In1 of the UPS module under test 100.

[0045] The target UPS module 200 operates in self-aging mode; the UPS module under test 100 operates in power supply mode; the target UPS module acts as the load of the UPS module under test to perform testing on the UPS module under test.

[0046] The UPS testing involved in this embodiment mainly involves performance testing, including testing of input parameters, output parameters, rated operating parameters, current sharing imbalance, and other performance parameters. The UPS module includes a main power unit and a bypass unit. When the UPS module is functioning normally, the power grid supplies power to the load after conversion through the main power module. When the UPS module malfunctions or requires maintenance, the power grid directly supplies power to the load through the bypass unit.

[0047] Specifically, during testing, the UPS module 100 under test is set to operate in power supply mode. The power grid outputs power to the target UPS module 200 through its main power unit. The target UPS module 200 operates in self-aging mode. After receiving the power from the UPS module 100 under test, it returns to the power grid through the main power unit and then through the bypass unit. In self-aging mode, the inverter in the main power unit of the target UPS module 200 tracks the voltage amplitude, phase, and frequency of its bypass unit, changing the UPS inverter from a traditional voltage source mode to a current source mode. The power is then fed back to the front-end power grid through the bypass. This not only reduces power loss while achieving full-load testing of the UPS, but also ensures that the electrical signal returned to the power grid from the bypass is consistent with the voltage amplitude, phase, and frequency of the power grid signal, avoiding interference with the power grid signal.

[0048] In this embodiment, compared to the self-aging method using the bypass unit of the UPS module under test 100 itself, using an additional target UPS module 200 as the load of the UPS module under test 100 can ensure that the output power of the UPS module under test 100 is not zero, so that the system efficiency of the UPS module under test 100 can meet the testing requirements of real application scenarios.

[0049] In one possible implementation, Figure 2 This embodiment shows a schematic diagram of the specific structure of the UPS test circuit provided, as follows: Figure 2 As shown, the UPS test circuit also includes a load device 300;

[0050] The load device 300 is connected to the output terminal Out1 of the UPS module under test 100.

[0051] In this embodiment, the UPS test circuit also includes a load device 300. When using the UPS test device provided in this embodiment, a smaller load device 300 can be selected to avoid the problem of high power consumption when using a large load device 300 for UPS testing. At the same time, in order to ensure that the output power factor of the UPS module 100 under test meets the requirements of the real application scenario, it is still necessary to set the load device 300 to consume the power output of the UPS module 100 under test.

[0052] In one possible implementation, the load device 300 is a resistive load.

[0053] In this embodiment, the load device 300 can also be a load that is a mixture of resistive and capacitive loads, a load that is a mixture of resistive and inductive loads, or a load that is a mixture of resistive, capacitive, and inductive loads.

[0054] In one possible implementation, the resistive load is an adjustable resistive load.

[0055] In this embodiment, the resistive load includes multiple resistive load units, which are connected in parallel. Each resistive load unit includes a resistor and a switch connected in series. The user can determine the number of closed resistive load units based on the required resistive load size.

[0056] In this embodiment, the load device 300 may further include an adjustable load consisting of a mixture of resistive and inductive forces. In this case, the load device 300 includes multiple load units, each connected in parallel, and each load unit includes a switch, a resistor, and an inductor connected in series.

[0057] In this embodiment, the resistive load can also be an adjustable resistor.

[0058] Specifically, the combination of the target UPS module 200 and the load device 300 consumes the power of the UPS module 100 under test. This not only avoids excessive consumption of grid power and achieves energy saving, but also enables the output power of the UPS module 100 under test to be diverted to avoid wire bundles and eliminate potential safety hazards caused by wire overheating.

[0059] In one possible implementation, such as Figure 2As shown, the UPS module under test 100 includes a first bypass relay K. b1 The first bypass unit 130 and the first main power unit;

[0060] The first main power unit includes a first inverter circuit 120 and a first rectifier circuit 110;

[0061] The AC terminal of the first rectifier circuit 110 is connected to the power grid, and the DC terminal of the first rectifier circuit 110 is connected to the DC terminal of the first inverter circuit 120.

[0062] First bypass relay K b1 The first terminal is connected to the power grid, and the first bypass relay K b1 The second end is connected to the first end of the first bypass unit 130, and the second end of the first bypass unit 130 is connected to the AC end of the first inverter circuit 120.

[0063] First bypass relay K b1 closure.

[0064] In this embodiment, the first main power unit may include a first inverter circuit 120 and a first rectifier circuit 110; the UPS module under test 100 includes a first main circuit output relay K. o1 and the first main circuit input relay K i1 .

[0065] Specifically, the first main circuit input relay K i1 The first end is connected to the power grid, and the first main circuit input relay K i1 The second terminal is connected to the AC terminal of the first rectifier circuit 110, the DC terminal of the first rectifier circuit 110 is connected to the DC terminal of the first inverter circuit 120, and the AC terminal of the first inverter circuit 120 is connected to the first main circuit output relay K. o1 The first terminal, the first main circuit output relay K o1 The second terminal is the output terminal Out1 of the UPS module 100 under test. The first bypass relay K... b1 The first terminal is the bypass terminal (bypass1) of the UPS module 100 under test. The bypass terminal (bypass1) is used to connect to the power grid. The first bypass relay K b1 The second end is connected to the first end of the first bypass unit 130, and the second end of the first bypass unit 130 is connected to the AC end of the first inverter unit. The UPS module under test 100 may also include a first battery module and a first DC-DC module, wherein one end of the first DC-DC module is connected to the DC end of the first rectifier circuit 110, and the other end is connected to the first battery module.

[0066] In this embodiment, the UPS module 100 under test operates in a power supply state during testing. In the power supply state, the first main circuit input relay K... i1 and the first main circuit output relay K o1 All circuits are closed, allowing the power grid to output power after passing through the first rectifier circuit 110 and the first inverter circuit 120. Furthermore, to ensure that the power units in the first main circuit track the voltage amplitude, phase, and frequency of the power grid, this embodiment controls the first bypass relay K. b1 closure.

[0067] In one possible implementation, such as Figure 2 As shown, the target UPS module 200 includes a second bypass relay K. b2 Second main circuit output relay K o2 Second bypass unit 230 and second main power unit;

[0068] The input terminal In2 of the target UPS module 200 is connected to the first terminal of the second main power unit, and the second terminal of the second main power unit is connected to the output relay K of the second main circuit. o2 First terminal, second main circuit output relay K o2 The second end is the output end of the target UPS module 200;

[0069] Second bypass relay K b2 The first terminal is connected to the input terminal In1 of the UPS module under test 100, and the second bypass relay K b2 The second terminal is connected to the first terminal of the second bypass unit 230, and the second terminal of the second bypass unit 230 is connected to the second main circuit output relay K. o2 The first end is connected;

[0070] First bypass relay K b1 Closed; the second main circuit output relay K o2 disconnect.

[0071] In this embodiment, the second main power unit may include a second inverter circuit 220 and a second rectifier circuit 210; the target UPS module 200 includes a second main circuit output relay Ko2 and a second main circuit input relay Ki2.

[0072] Specifically, the second main circuit input relay K i2 The first terminal is the input terminal In2 of the target UPS module 200, and the second main circuit input relay K i2 The second terminal is connected to the AC terminal of the second rectifier circuit 210, the DC terminal of the second rectifier circuit 210 is connected to the DC terminal of the second inverter circuit 220, and the AC terminal of the second inverter circuit 220 is connected to the second main circuit output relay K.o2 The first terminal, the second main circuit output relay K o2 The second terminal is the output terminal of the target UPS module 200. Second bypass relay K b2 The first terminal is the bypass terminal, and the second bypass relay K b2 The second end is connected to the first end of the second bypass unit 230, and the second end of the second bypass unit 230 is connected to the AC terminal of the second inverter circuit 220. The target UPS module 200 may also include a second battery module and a second DC-DC module, wherein one end of the second DC-DC module is connected to the DC terminal of the second rectifier circuit, and the other end is connected to the second battery module.

[0073] In this embodiment, when testing the UPS module 100 under test, the input terminal In2 of the target UPS module 200 is connected to the output terminal Out1 of the UPS module 100 under test, the bypass terminal of the target UPS module 200 is connected to the input terminal In1 of the UPS module 100 under test, and the second bypass relay K of the target UPS module 200 is connected. b2 Close, second main circuit input relay K i2 Close, the second main circuit output relay K o2 When disconnected, the target UPS operates in self-aging mode. In this mode, the output power of the UPS module 100 under test is delivered to the target UPS module 200. After passing through the second rectifier circuit 210 and the second inverter circuit 220 of the target UPS module 200, the output power is returned to the power grid via the second bypass unit 230. Throughout this process, the main power units of both the UPS module 100 under test and the target UPS module 200 track the voltage amplitude, phase, and frequency of the bypass, i.e., track the voltage amplitude, phase, and frequency of the power grid. Therefore, the voltage amplitude, phase, and frequency of the electrical signal returned to the power grid are consistent with those of the power grid, thereby achieving grid recycling and energy saving.

[0074] In one possible implementation, such as Figure 3 As shown, the target UPS module 200 includes at least one; the input terminal of each target UPS module 200 is connected to the output terminal of the UPS module 100 under test, and the bypass of each target UPS module 200 is connected to the input terminal of the UPS module 100 under test.

[0075] In this embodiment, if a single target UPS module 200 cannot meet the load requirements of the UPS module 100 under test, multiple target UPS modules 200 can be connected to the output terminal Out1 of the UPS module 100 under test. The switching state inside each target UPS module 200 and its connection relationship with the UPS module 100 under test are the same as when there is a single target UPS module 200.

[0076] The above method can avoid the problem of insufficient power of the target UPS module 200, and distribute the load of the UPS module 100 under test to multiple target UPS modules 200. It can disperse the wiring harness between the UPS module 100 under test and the target UPS module 200, reduce the heat generated by the wiring harness, and ensure the safety of the UPS test process.

[0077] In one possible implementation, such as Figure 4 As shown, the UPS module under test includes at least one;

[0078] The input terminals of each UPS module under test 100 are connected to the power grid, and the output terminals of each UPS module under test 100 are connected to the input terminals of the target UPS module 200. The bypass of the target UPS module 200 is connected to the input terminals of each UPS module under test 100.

[0079] In this embodiment, if the load requirement of the UPS module 100 under test is small, while the rated power of the target UPS module 200 is large, the target UPS module 200 can be used as the load of multiple UPS modules 100 under test at the same time, thereby realizing the testing of multiple UPS modules under test simultaneously and improving the testing efficiency of the UPS modules under test.

[0080] In one possible implementation, the second main power unit includes a second inverter circuit 220 and a second rectifier circuit 210;

[0081] The AC terminal of the second rectifier circuit 210 is the first terminal of the second main power unit, the DC terminal of the second rectifier circuit 210 is connected to the DC terminal of the second inverter circuit 220, and the AC terminal of the second inverter circuit 220 is the second terminal of the second main power unit.

[0082] This invention provides a UPS testing device, including a controller and a UPS testing circuit as described above;

[0083] The controller is used to control the operation of the UPS test circuit.

[0084] In this embodiment, the controller is used to control the operating mode of the UPS module under test 100 to enter the power supply mode, control the operating mode of the target UPS to enter the self-aging mode, and control the first main circuit input relay K. i1 Second main circuit input relay K i2 and the first main circuit output relay K o1 Close, control the output relay K of the second main circuit o2 Disconnect and control the first bypass relay K b1 Second bypass relay K b2Close the circuit to allow the UPS test device to test the UPS module 100 under test.

[0085] Furthermore, the controller can determine the load units in the load device 300 that need to be closed based on the load power set by the user, and control the corresponding load unit's switch to close while the switches of other load units are opened.

[0086] In one possible implementation, the controller is also used to calculate and display the power characteristic parameters of the UPS module 100 under test.

[0087] In this embodiment, power characteristic parameters include voltage, current, input power, output power, output power factor, and energy loss. The UPS test circuit also includes a voltage acquisition module and a current acquisition module. The voltage acquisition module includes a first input voltage acquisition unit, a first output voltage acquisition unit, a second input voltage acquisition unit, and a second output voltage acquisition unit. The current acquisition module includes a first input current acquisition unit, a first output current acquisition unit, a second input current acquisition unit, and a second output current acquisition unit. The controller can acquire the input voltage of the UPS module 100 under test acquired by the first input voltage acquisition unit, the input current of the UPS module 100 under test acquired by the first input current acquisition unit, the output voltage of the UPS module 100 under test acquired by the first output voltage acquisition unit, and the output current of the UPS module 100 under test acquired by the first output voltage acquisition unit. The controller obtains the input power of the UPS module 100 under test at full load based on the input voltage and input current at full load, obtains the output power of the UPS module 100 under test at full load based on the output voltage and output current at full load, obtains the energy loss based on the input power and output power of the UPS module 100 under test at full load, and can also obtain the output power factor of the UPS module 100 under test at full load based on the apparent power and active power of the UPS.

[0088] In this embodiment, the UPS testing device may also include a display screen, on which the power characteristic parameters of the UPS module 100 under test are displayed.

[0089] Specifically, the controller can also acquire the input voltage of the target UPS module 200 acquired by the second input voltage acquisition unit, the input current of the target UPS module 200 acquired by the second input current acquisition unit, the output voltage of the target UPS module 200 acquired by the second output voltage acquisition unit, and the output current of the target UPS module 200 acquired by the second output current acquisition unit. Based on the input voltage and input current, the controller obtains the input power of the target UPS module 200, and based on the output voltage and output current, it obtains the output power of the target UPS module 200.

[0090] In this embodiment, the controller can also obtain the switching status of each load unit in the load device 300, determine the current load of the load device 300 based on the switching status of each load unit, and display the current load on the display screen for user reference.

[0091] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0092] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A UPS test circuit, characterized by, The UPS testing circuit comprises: a to-be-tested UPS module and a target UPS module; an input end of the to-be-tested UPS module is connected to a power grid; an output end of the to-be-tested UPS module is connected to an input end of the target UPS module, and a bypass of the target UPS module is connected to the input end of the to-be-tested UPS module; the target UPS module works in an aging mode, the to-be-tested UPS module works in a power supply mode, and the target UPS module tests the to-be-tested UPS module as a load of the to-be-tested UPS module.

2. The UPS test circuit of claim 1, wherein, The UPS testing circuit further comprises a load device; the load device is connected to an output end of the to-be-tested UPS module.

3. The UPS test circuit of claim 1, wherein, The to-be-tested UPS module comprises a first bypass relay, a first bypass unit and a first main power unit; the first main power unit comprises a first inverter circuit and a first rectifier circuit; an alternating current end of the first rectifier circuit is connected to the power grid, and a direct current end of the first rectifier circuit is connected to a direct current end of the first inverter circuit; a first end of the first bypass relay is connected to the power grid, a second end of the first bypass relay is connected to a first end of the first bypass unit, and a second end of the first bypass unit is connected to an alternating current end of the first inverter circuit; the first bypass relay is closed.

4. The UPS test circuit of claim 3, wherein, The target UPS module comprises a second bypass relay, a second main loop output relay, a second bypass unit and a second main power unit; an input end of the target UPS module is connected to a first end of the second main power unit, a second end of the second main power unit is connected to a first end of the second main loop output relay, and a second end of the second main loop output relay is an output end of the target UPS module; a first end of the second bypass relay is connected to an input end of the to-be-tested UPS module, a second end of the second bypass relay is connected to a first end of the second bypass unit, and a second end of the second bypass unit is connected to the first end of the second main loop output relay; the first bypass relay is closed; the second main loop output relay is disconnected.

5. The UPS test circuit of claim 2, wherein, The load device is an adjustable resistive load.

6. The UPS test circuit of claim 1, wherein, The target UPS module comprises at least one; an input end of each target UPS module is connected to an output end of the to-be-tested UPS module, and a bypass of each target UPS module is connected to an input end of the to-be-tested UPS module.

7. The UPS test circuit of claim 1, wherein, The to-be-tested UPS module comprises at least one; an input end of each to-be-tested UPS module is connected to a power grid, an output end of each to-be-tested UPS module is connected to an input end of the target UPS module, and a bypass of the target UPS module is connected to the input end of each to-be-tested UPS module.

8. The UPS test circuit of claim 4, wherein, The second main power unit comprises a second inverter circuit and a second rectifier circuit; an alternating current end of the second rectifier circuit is the first end of the second main power unit, a direct current end of the second rectifier circuit is connected to a direct current end of the second inverter circuit, and an alternating current end of the second inverter circuit is the second end of the second main power unit.

9. A UPS testing apparatus, characterized by, The UPS testing circuit comprises a controller and the UPS testing circuit according to any one of claims 1 to 7. The controller is used for controlling the UPS test circuit to work.

10. The UPS testing device of claim 9, wherein, The controller is also used for calculating and displaying the power characteristic parameters of the UPS module to be tested.

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