Uninterruptible power supply performance test circuit and device

Abstract

The utility model discloses an uninterruptible power supply performance test circuit and an uninterruptible power supply performance test device. The test circuit comprises a load test loop which comprises a test connection terminal and a load unit; the test connection terminal is arranged in a power line and is used for being electrically connected with an uninterruptible power supply; the load unit is connected in series in a post-stage line of the test connection terminal. The control loop comprises a control unit, a mode switching unit and a load conversion unit; the mode switching unit is electrically connected between the commercial power and the test connection terminal; the load conversion unit is electrically connected to a load unit, and the load unit comprises at least two loads; the control unit is used for controlling the mode switching unit to switch a preset test mode for testing the uninterruptible power supply; wherein the preset test mode represents a power supply form for the load; and the control unit is also used for controlling the load conversion unit to convert the types of the loads electrically connected with the uninterruptible power supply. According to the technical scheme provided by the embodiment of the invention, the UPS can be subjected to performance test.

Description

Technical Field

[0001] This application relates to the field of UPS technology, and in particular to an uninterruptible power supply performance testing circuit and device. Background Technology

[0002] An uninterruptible power supply (UPS) is a system that connects a battery to a main unit and converts DC power into AC power through the main unit's inverter and other circuits. It is widely used in finance, telecommunications, government agencies, rail transportation, power, and manufacturing industries.

[0003] As power electronic devices, UPS systems are bound to malfunction over prolonged use. The batteries inside the UPS, in particular, are consumable components and are easily affected by environmental factors, often failing first. A malfunctioning UPS can severely impact the operation of the power system; therefore, targeted preliminary testing of the UPS's performance is crucial. However, currently, there are no readily available, simple aging test fixtures for UPS systems to specifically test their performance. Utility Model Content

[0004] This application provides an uninterruptible power supply (UPS) performance testing circuit and device to solve the problem that it is currently impossible to perform preliminary performance testing on UPS.

[0005] According to one aspect of this application, an uninterruptible power supply performance testing circuit is provided, comprising:

[0006] A load test circuit includes test connection terminals and a load unit; the test connection terminals are disposed in the power line for electrical connection to an uninterruptible power supply; the load unit is connected in series in the downstream circuit of the test connection terminals.

[0007] The control loop includes a control unit, a mode switching unit, and a load conversion unit; the control unit is electrically connected to the mode switching unit and the load conversion unit respectively; the mode switching unit is electrically connected between the mains power and the test connection terminal; the load conversion unit is electrically connected to the load unit, and the load unit includes at least two types of loads.

[0008] The control unit is used to control the mode switching unit to switch to a preset test mode for testing the uninterruptible power supply; wherein, the preset test mode represents the power supply form to the load; the control unit is also used to control the load conversion unit to convert the type of load electrically connected to the uninterruptible power supply.

[0009] Optionally, the mode switching unit includes a first switch;

[0010] The first switch is connected in series between the mains power and the test connection terminal, and the first switch is electrically connected to the control unit;

[0011] The preset test modes include an AC power test mode and a battery test mode; the control unit is used to control the first switch to close, so that the uninterruptible power supply enters the AC power test mode; the control unit is also used to control the first switch to close, so that the uninterruptible power supply enters the battery test mode.

[0012] Optionally, the load unit includes a capacitive load, a resistive load, and an inductive load;

[0013] The capacitive load, the resistive load, and the inductive load are connected in parallel.

[0014] Optionally, the load switching unit includes a second switch and a third switch;

[0015] The second switch is connected in series with the inductive load, and the third switch is connected in series with the capacitive load; both the second switch and the third switch are electrically connected to the control unit.

[0016] The control unit is used to control the second switch to close and the third switch to open, so as to test the load-carrying performance of the uninterruptible power supply (UPS) for the inductive load and the resistive load; the control unit is also used to control the second switch to open and the third switch to close, so as to test the load-carrying performance of the UPS for the capacitive load and the resistive load; the control unit is also used to control both the second switch and the third switch to open, so as to test the load-carrying performance of the UPS for the resistive load.

[0017] Optionally, the uninterruptible power supply performance test circuit also includes: a voltage monitoring unit;

[0018] The voltage monitoring unit is connected in series in the downstream circuit between the test connection terminal and the load unit, and the voltage monitoring unit is electrically connected to the control unit;

[0019] The voltage monitoring unit is used to monitor the voltage of the downstream line of the uninterruptible power supply and transmit the voltage of the downstream line to the control unit.

[0020] Optionally, the uninterruptible power supply performance test circuit may also include: a protection unit;

[0021] The protection unit is connected in series in the power line between the mains power and the mode switching unit;

[0022] The protection unit includes a fourth switch, used to disconnect the electrical connection between the mains power and the uninterruptible power supply when the control unit is unable to control the mode switching unit to disconnect.

[0023] Optionally, the uninterruptible power supply performance test circuit may also include: a start-stop unit;

[0024] The start / stop unit is electrically connected to the control unit;

[0025] The start / stop unit includes a fifth switch for controlling the start and stop of the uninterruptible power supply performance test circuit.

[0026] Optionally, the fourth switch includes a miniature circuit breaker, and the fifth switch includes a push button.

[0027] Optionally, the control unit includes a first indicator light, a second indicator light, and a third indicator light;

[0028] The first indicator light is used to indicate the normal operating status of the uninterruptible power supply;

[0029] The second indicator light is used to indicate the status of the uninterruptible power supply after the performance test is completed;

[0030] The third indicator light is used to indicate the fault status of the uninterruptible power supply.

[0031] According to another aspect of this application, an uninterruptible power supply (UPS) performance testing device is provided, including the UPS performance testing circuit as described in any embodiment of the first aspect.

[0032] The uninterruptible power supply (UPS) performance testing circuit provided in this application includes a load test circuit comprising test connection terminals and load units connected in series with the test connection terminals in the subsequent circuit. The test connection terminals are located in the power line and are used for electrical connection with the UPS. The control unit in the control circuit can adjust the connection relationship between the mains power and the UPS through a control mode switching unit to simulate the situation where the load is powered in different forms under actual operating conditions, thereby testing the load-carrying capacity of the UPS under the simulated corresponding operating conditions. The control unit can also adjust the types of loads connected in the subsequent circuit of the UPS through a load switching unit to simulate the situation where the UPS is connected to different types of loads under actual operating conditions, thereby testing the load-carrying capacity of the UPS under the simulated corresponding operating conditions. This achieves the effect of preliminary testing of the UPS's operating status, thus providing data support for the preliminary determination of whether the UPS can work normally.

[0033] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description

[0034] 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.

[0035] Figure 1 This is a schematic diagram of the structure of an uninterruptible power supply performance testing circuit according to an embodiment of this application;

[0036] Figure 2 This is a schematic diagram of an uninterruptible power supply (UPS) performance testing circuit electrically connected to an UPS, according to an embodiment of this application.

[0037] Figure 3 This is a schematic diagram of another uninterruptible power supply performance testing circuit electrically connected to an uninterruptible power supply according to an embodiment of this application;

[0038] Figure 4 This is a schematic diagram of another uninterruptible power supply performance testing circuit electrically connected to an uninterruptible power supply according to an embodiment of this application;

[0039] Figure 5 This is a schematic diagram of another uninterruptible power supply performance testing circuit electrically connected to an uninterruptible power supply according to an embodiment of this application;

[0040] Figure 6 This is a schematic diagram of the logic flow for performing uninterruptible power supply performance testing in mains power test mode according to an embodiment of this application;

[0041] Figure 7 This is a schematic diagram of the logic flow for performing uninterruptible power supply performance testing in battery test mode, according to an embodiment of this application. Detailed Implementation

[0042] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0043] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0044] This application provides an uninterruptible power supply performance testing circuit. Figure 1 This is a schematic diagram of the structure of an uninterruptible power supply performance testing circuit provided in an embodiment of this application. Figure 2 This is a schematic diagram of an uninterruptible power supply (UPS) performance testing circuit electrically connected to a UPS, as provided in an embodiment of this application. (Combined with...) Figure 1 and Figure 2 The uninterruptible power supply performance test circuit includes: a load test circuit 10 and a control circuit 20.

[0045] The load test circuit 10 includes a test connection terminal 13 and a load unit 12. The test connection terminal 13 is disposed in the power line and is used to be electrically connected to the uninterruptible power supply 11. The load unit 12 is connected in series in the downstream circuit of the test connection terminal 13.

[0046] The control loop 20 includes a control unit 21, a mode switching unit 22, and a load conversion unit 23. The control unit 21 is electrically connected to the mode switching unit 22 and the load conversion unit 23 respectively. The mode switching unit 22 is electrically connected between the mains power and the test connection terminal 13. The load conversion unit 23 is electrically connected to the load unit 12, which includes at least two types of loads.

[0047] The control unit 21 is used to control the mode switching unit 22 to switch the preset test mode for testing the uninterruptible power supply 11; wherein, the preset test mode represents the power supply form of the load; the control unit 21 is also used to control the load conversion unit 23 to convert the type of load electrically connected to the uninterruptible power supply 11.

[0048] Specifically, the test connection terminal 13 in the load test circuit 10 is used to electrically connect the uninterruptible power supply 11 to be tested, that is, to connect the uninterruptible power supply 11 to a power line containing a live wire L and a neutral wire N, and to connect the load unit 12 in series in the downstream circuit of the uninterruptible power supply 11, so as to initially test the UPS's ability to carry at least two loads included in the load unit 12, thereby determining whether the UPS can work normally.

[0049] The mode switching unit 22 in the control loop 20 controls the connection between the mains power and the uninterruptible power supply 11, and the load switching unit 23 controls the connection between the different types of loads included in the load unit 12 and the uninterruptible power supply 11. By sending relevant signals to the mode switching unit 22 through the control unit 21, the control unit 22 performs corresponding actions, thereby simulating the situation where the uninterruptible power supply 11 supplies power to the load in different power supply forms under actual operating conditions, thus testing the load-carrying capacity of the uninterruptible power supply 11 under a preset test mode. Simultaneously, the control unit 21 can also send relevant signals to the load switching unit 23, controlling the load switching unit 23 to perform corresponding actions, thereby simulating the situation where different types of loads are connected to the downstream circuit of the uninterruptible power supply 11 under actual operating conditions, thus testing the load-carrying capacity of the uninterruptible power supply 11 when connected to different types of loads.

[0050] The uninterruptible power supply (UPS) performance testing circuit provided in this application includes a load test circuit comprising test connection terminals and load units connected in series with the test connection terminals in the subsequent circuit. The test connection terminals are located in the power line and are used for electrical connection with the UPS. The control unit in the control circuit can adjust the connection relationship between the mains power and the UPS through a control mode switching unit to simulate the situation where the load is powered in different forms under actual operating conditions, thereby testing the load-carrying capacity of the UPS under the simulated corresponding operating conditions. The control unit can also adjust the types of loads connected in the subsequent circuit of the UPS through a load switching unit to simulate the situation where the UPS is connected to different types of loads under actual operating conditions, thereby testing the load-carrying capacity of the UPS under the simulated corresponding operating conditions. This achieves the effect of preliminary testing of the UPS's operating status, thus providing data support for the preliminary determination of whether the UPS can work normally.

[0051] Optionally, Figure 3 This is a schematic diagram of another uninterruptible power supply (UPS) performance testing circuit provided in this application, electrically connected to a UPS. Based on the above embodiments, as follows... Figure 3 As shown, the mode switching unit 22 includes a first switch KM1.

[0052] The first switch KM1 is connected in series between the mains power and the test connection terminal 11, and the first switch KM1 is electrically connected to the control unit 21; the preset test modes include mains power test mode and battery test mode; the control unit 21 is used to control the first switch KM1 to close, so that the uninterruptible power supply 11 enters the mains power test mode; the control unit 21 is also used to control the first switch KM1 to close, so that the uninterruptible power supply 11 enters the battery test mode.

[0053] For example, the first switch KM1 can be a contactor. A contactor utilizes electromagnetic, pneumatic, or hydraulic principles to control the switching of the main circuit, offering advantages such as strong current interruption capability, rapid action, and safe operation. The first switch KM1 controls the connection or disconnection between the mains power and the uninterruptible power supply 11, thereby switching the test mode of the uninterruptible power supply 11 between mains power test mode and battery test mode. Specifically, when the control unit 21 sends a signal to the first switch KM1 to close it, the mains power and the uninterruptible power supply 11 are connected. At this time, the uninterruptible power supply 11 is tested in mains power test mode for its load-carrying capacity; that is, the load-carrying performance of the uninterruptible power supply 11 is tested when both mains power and the uninterruptible power supply 11 supply power to the load. When the control unit 21 sends a signal to the first switch KM1 to control the first switch KM1 to turn off, the mains power is disconnected from the uninterruptible power supply 11. At this time, the uninterruptible power supply 11 is tested for its load-carrying capacity in the battery test mode. That is, the uninterruptible power supply 11 completely acts as a battery to supply power to the load in order to test the load-carrying capacity of the uninterruptible power supply 11.

[0054] Optionally, Figure 4 This is a schematic diagram of another uninterruptible power supply (UPS) performance testing circuit electrically connected to a UPS, provided in an embodiment of this application. Based on the above embodiments, as follows... Figure 4 As shown, the load unit 12 includes a capacitive load 121, a resistive load 122, and an inductive load 123; the capacitive load 121, the resistive load 122, and the inductive load 123 are connected in parallel, which can simulate the situation where the downstream circuit of the uninterruptible power supply 11 is connected to loads of different natures in actual working conditions, so as to test the corresponding load-carrying capacity of the uninterruptible power supply 11.

[0055] Optionally, based on the above embodiments, see below. Figure 4 The load switching unit 23 includes a second switch KM2 and a third switch KM3.

[0056] The second switch KM2 is connected in series with the inductive load 123, and the third switch KM3 is connected in series with the capacitive load 121. Both the second switch KM2 and the third switch KM3 are electrically connected to the control unit 21. The control unit 21 is used to control the second switch KM2 to close and the third switch KM3 to open, so as to test the load-carrying performance of the uninterruptible power supply 11 on the inductive load 123 and the resistive load 122. The control unit 21 is also used to control the second switch KM2 to open and the third switch KM3 to close, so as to test the load-carrying performance of the uninterruptible power supply 11 on the capacitive load 121 and the resistive load 122. The control unit 21 is also used to control both the second switch KM2 and the third switch KM3 to open, so as to test the load-carrying performance of the uninterruptible power supply 11 on the resistive load 122.

[0057] Specifically, the second switch KM2 is connected in series in the parallel branch containing the inductive load 123 and is electrically connected to the control unit 21. The third switch KM3 is connected in series in the parallel branch containing the capacitive load 121 and is electrically connected to the control unit 21. The control unit 21 can change the type of load connected in the downstream circuit of the uninterruptible power supply 11 by controlling the second switch KM2 and the third switch KM3 to be in the on or off state. For example, the second switch KM2 and the third switch KM3 can also be implemented using contactors. When the control unit 21 sends a signal to the second switch KM2 and the third switch KM3 to control the second switch KM2 to be closed and the third switch KM3 to be open, the inductive load 123 and the resistive load 122 are connected in parallel and in series in the downstream circuit of the uninterruptible power supply 11. At this time, the load-carrying capacity of the uninterruptible power supply 11 when supplying power to the inductive load 123 and the resistive load 122 can be tested. When the control unit 21 sends signals to the second switch KM2 and the third switch KM3, controlling the second switch KM2 to open and the third switch KM3 to close, the capacitive load 121 and the resistive load 122 are connected in parallel and in series in the downstream circuit of the uninterruptible power supply 11. At this time, the load-carrying capacity of the uninterruptible power supply 11 when supplying power to the capacitive load 121 and the resistive load 122 can be tested. When the control unit 21 sends signals to the second switch KM2 and the third switch KM3, controlling the second switch KM2 and the third switch KM3 to be in the open state, the resistive load 122 remains connected in series in the downstream circuit of the uninterruptible power supply 11. At this time, the load-carrying capacity of the uninterruptible power supply 11 when supplying power only to the resistive load 122 can be tested.

[0058] Optionally, Figure 5 This is a schematic diagram of another uninterruptible power supply (UPS) performance testing circuit electrically connected to a UPS, provided in an embodiment of this application. Based on the above embodiments, as follows... Figure 5 As shown, the uninterruptible power supply performance test circuit also includes a voltage monitoring unit 30.

[0059] The voltage monitoring unit 30 is connected in series in the downstream circuit between the test connection terminal and the load unit 12, and the voltage monitoring unit 30 is electrically connected to the control unit 21; the voltage monitoring unit 30 is used to monitor the downstream circuit voltage of the uninterruptible power supply 11 and transmit the downstream circuit voltage to the control unit 21.

[0060] Specifically, a voltage monitoring unit 30 is electrically connected between the live wire L and the neutral wire N between the uninterruptible power supply 11 and the load unit 12. During the load-carrying performance test of the uninterruptible power supply 11, the voltage monitoring unit 30 detects the voltage of the downstream circuit connected to the load and transmits the detected downstream circuit voltage to the control unit 21. The control unit 21 can compare the received downstream circuit voltage with a voltage threshold to determine whether there is any abnormality in the downstream circuit voltage during the test, which helps improve the accuracy of load-carrying performance testing of the uninterruptible power supply 11.

[0061] Optionally, based on the above embodiments, see below. Figure 5 The uninterruptible power supply performance test circuit also includes: protection unit 40.

[0062] The protection unit 40 is connected in series in the power line between the mains power and the mode switching unit 22; the protection unit 40 includes a fourth switch S1, which is used to disconnect the power connection between the mains power and the uninterruptible power supply 11 when the control unit 21 is unable to control the mode switching unit 22 to disconnect.

[0063] The uninterruptible power supply performance test circuit also includes: a start / stop unit 50.

[0064] The start-stop unit 50 is electrically connected to the control unit 21; the start-stop unit 50 includes a fifth switch S2 for controlling the start and stop of the uninterruptible power supply performance test circuit.

[0065] For example, the fourth switch S1 includes a miniature circuit breaker, and the fifth switch S2 includes a push button. During the load-carrying capacity test of the uninterruptible power supply 11, when switching from the mains power test mode to the battery test mode, the control unit 21 sends a signal to the first switch KM1, controlling the first switch KM1 to switch from the closed state to the open state. However, the first switch KM1 may not respond correctly to the signal and remain in the closed state. In this case, to protect the downstream equipment connected to the uninterruptible power supply 11 from damage, the fourth switch S1 can be manually disconnected by the operator in case of an abnormality, thus disconnecting the mains power from the uninterruptible power supply 11. In addition, the uninterruptible power supply performance test circuit is also provided with a start / stop unit 50, which can be implemented through the push button-type fifth switch S2, allowing one-button control of the start or stop of the entire uninterruptible power supply performance test circuit.

[0066] Optionally, based on the above embodiments, see below. Figure 5The control unit 21 includes a first indicator light L1, a second indicator light L2, and a third indicator light L3.

[0067] The first indicator light L1 is used to indicate the normal operating status of the uninterruptible power supply 11; the second indicator light L2 is used to indicate the status of the uninterruptible power supply 11 after completing the performance test; and the third indicator light L3 is used to indicate the fault status of the uninterruptible power supply 11.

[0068] For example, during the performance test of the uninterruptible power supply 11, the control unit 21 keeps the first indicator light L1 constantly lit, indicating that the uninterruptible power supply 11 is in normal operation during the test. When the voltage monitoring unit 30 detects an abnormal voltage in the downstream stage, the control unit 21 controls the first indicator light L1 to turn off and the third indicator light L3 to remain lit, indicating that the uninterruptible power supply 11 has a fault state during the test; or, when the control unit 21 issues a closing command to the second switch KM2 or the third switch KM3, but the second switch KM2 or the third switch KM3 does not close, so that the inductive load 123 or the capacitive load 121 is not connected to the downstream circuit, the control unit 21 controls the first indicator light L1 to turn off and the third indicator light L3 to remain lit, indicating that the power supply of the uninterruptible power supply 11 is abnormal. If the uninterruptible power supply 11 is operating normally during the test, and the control unit 21 keeps the first indicator light L1 constantly lit, when the test is completed, the control unit 21 controls the first indicator light L1 to turn off and the second indicator light L2 to light up, indicating that the test is complete. At this time, pressing the fifth switch S2 again will exit the program operation.

[0069] This application also provides an uninterruptible power supply (UPS) performance testing device. This UPS performance testing device includes the UPS performance testing circuit provided in any embodiment of this application. Its working principle and beneficial effects are similar to those of the UPS performance testing circuit, and will not be described in detail here.

[0070] Based on the uninterruptible power supply performance testing circuits provided in the above embodiments, the specific working logic for aging tests on uninterruptible power supplies is as follows:

[0071] Figure 6 This is a schematic diagram of the logic flow for uninterruptible power supply performance testing in mains power test mode, provided in an embodiment of this application. Figure 6 As shown, the method for testing the performance of an uninterruptible power supply (UPS) in mains power test mode includes the following steps:

[0072] Step S101: Control the first switch KM1 to engage and maintain it for a time T1 minutes;

[0073] Step S102: The voltage monitoring unit detects whether the voltage of the subsequent stage is within the voltage range [U0, U1]; if yes, proceed to step S103; if no, proceed to step S107.

[0074] Step S103: Control the second switch KM2 to engage once every T2 minutes, and maintain engagement for T3 minutes each time before disengaging, for a total of three engagements, in order to test the uninterruptible power supply's load-carrying capacity for parallel inductive and resistive loads.

[0075] Step S104: The voltage monitoring unit detects whether the voltage of the subsequent stage is within the voltage range [U0, U1]; if yes, proceed to step S105; if no, proceed to step S107.

[0076] Step S105: Control the third switch KM3 to engage once every T4 minutes, and maintain engagement for T5 minutes each time before disengaging, for a total of three engagements, in order to test the uninterruptible power supply's ability to carry capacitive and resistive loads in parallel.

[0077] Step S106: The voltage monitoring unit detects whether the voltage of the subsequent stage is within the voltage range [U0, U1]; if yes, proceed to step S108; if no, proceed to step S107.

[0078] Step S107: Uninterruptible power supply failure, test failed;

[0079] Step S108: Test passed.

[0080] It should be noted that the time T1 minutes for controlling the first switch KM1 to engage in step S101 is the total duration from the start of engaging the first switch KM1 to the end of the test, to complete the performance test of the uninterruptible power supply (UPS) in the mains power test mode. When the engagement time reaches T1 minutes, the control unit controls the first switch KM1 to disengage, thus switching to the battery test mode. Furthermore, during the testing of the load-carrying capacity of inductive and resistive loads in parallel, and capacitive and resistive loads in parallel, if the UPS supplies power to the corresponding load for less than the required duration (i.e., the UPS prematurely terminates power supply), it also indicates a fault in the UPS, and the test fails. In the event of a UPS fault, the control unit controls the UPS to disconnect from the power line for manual repair. If the fault is repairable, the performance test can be restarted after the faulty UPS is repaired; if the fault is irreparable, the faulty UPS will be scrapped or returned to the factory for repair.

[0081] Figure 7 This is a schematic diagram of the logic flow for uninterruptible power supply performance testing in battery test mode, provided in an embodiment of this application. Figure 7 As shown, the method for performing uninterruptible power supply performance testing in battery test mode includes the following steps:

[0082] Step S201: After the first switch KM1 has been engaged for 1 minute, the second switch KM2 and the third switch KM3 are disengaged.

[0083] Step S202: Disconnect the first switch KM1 and enter the battery test mode;

[0084] Step S203: The voltage monitoring unit detects whether the voltage of the subsequent stage is within the voltage range [U0, U1]; if yes, proceed to step S204; if no, proceed to step S206.

[0085] Step S204: Test the load-carrying performance of the uninterruptible power supply on the resistive load in the battery test mode. Control the counter to accumulate the time from the initial zero moment with a time step ΔT to obtain the time T0 minutes.

[0086] Step S205: Determine whether time T0 minutes is greater than or equal to T6 minutes; if yes, proceed to step S207; if no, proceed to step S203.

[0087] Step S206: Uninterruptible power supply failure, the battery test mode fails, and the time T0 minutes is reset to zero;

[0088] Step S207: If the uninterruptible power supply passes the battery test mode, the time T0 minutes is reset to zero.

[0089] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An uninterruptible power supply performance test circuit, comprising: The application relates to a load test circuit for an uninterruptible power supply (UPS), which comprises a test connection terminal and a load unit; the test connection terminal is arranged in a power line and is electrically connected with the UPS; the load unit is connected in series in the power line behind the test connection terminal; a control circuit comprises a control unit, a mode switching unit and a load switching unit; the control unit is electrically connected with the mode switching unit and the load switching unit; the mode switching unit is electrically connected between the power supply and the test connection terminal; the load switching unit is electrically connected with the load unit, and the load unit comprises at least two kinds of loads; the control unit is used for controlling the mode switching unit to switch a preset test mode for testing the UPS; the preset test mode represents the power supply form of the load; and the control unit is also used for controlling the load switching unit to switch the kind of load electrically connected with the UPS. The mode switching unit comprises a first switch; the first switch is connected in series between the power supply and the test connection terminal, and the first switch is electrically connected with the control unit; the preset test mode comprises a power supply test mode and a battery test mode; the control unit is used for controlling the first switch to be turned on, so that the UPS enters the power supply test mode; and the control unit is also used for controlling the first switch to be turned off, so that the UPS enters the battery test mode. The load unit comprises a capacitive load, a resistive load and an inductive load; the capacitive load, the resistive load and the inductive load are connected in parallel. The load switching unit comprises a second switch and a third switch; the second switch is connected in series with the inductive load, and the third switch is connected in series with the capacitive load; the second switch and the third switch are both electrically connected with the control unit; the control unit is used for controlling the second switch to be turned on and the third switch to be turned off, so as to test the load carrying performance of the UPS to the inductive load and the resistive load; the control unit is also used for controlling the second switch to be turned off and the third switch to be turned on, so as to test the load carrying performance of the UPS to the capacitive load and the resistive load; and the control unit is also used for controlling the second switch and the third switch to be both turned off, so as to test the load carrying performance of the UPS to the resistive load. The application further comprises a voltage monitoring unit; the voltage monitoring unit is connected in series in the power line behind the test connection terminal and the load unit, and the voltage monitoring unit is electrically connected with the control unit; the voltage monitoring unit is used for monitoring the voltage of the power line behind the UPS and transmitting the voltage to the control unit.

2. The UPS performance testing circuit of claim 1, wherein, The application further comprises a protection unit; the protection unit is connected in series in the power line between the power supply and the mode switching unit; the protection unit comprises a fourth switch, which is used for disconnecting the power supply from the UPS when the control unit cannot control the mode switching unit to be turned off. The application further comprises a start-stop unit; the start-stop unit is electrically connected with the control unit. ​ 3. The UPS performance testing circuit of claim 1, wherein, ​ ​ 4. The UPS performance testing circuit of claim 3, wherein, ​ ​ ​ 5. The UPS performance testing circuit of claim 1, wherein, ​ ​ ​ ​ 6. The UPS performance testing circuit of claim 1, wherein, ​ ​ ​ ​ 7. The UPS performance testing circuit of claim 6, wherein, ​ ​ ​ The start-stop unit comprises a fifth switch for controlling start and stop of the UPS performance test circuit.

8. The UPS performance testing circuit of claim 7, wherein, The fourth switch comprises a miniature circuit breaker, and the fifth switch comprises a button.

9. The UPS performance testing circuit of claim 1, wherein, The control unit comprises a first indicator light, a second indicator light and a third indicator light. The first indicator light is used for indicating a normal operation state of the UPS. The second indicator light is used for indicating a performance test completion state of the UPS. The third indicator light is used for indicating a fault state of the UPS.

10. An uninterruptible power supply performance testing apparatus, characterized by, An UPS performance test circuit comprising any one of the UPS performance test circuits according to claims 1-9.

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