Test device and power unit system
By using the upper computer and control driver in the converter to test the power unit, the problem of damage and testing of the power unit during transportation and testing is solved, and higher testing safety and efficiency are achieved.
Patent Information
- Application Number
- CN202421219721.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-30
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-05-30
AI Technical Summary
In the prior art, power units are prone to damage during transport and testing, and the testing process is cumbersome and there is a risk of electric shock, resulting in low test safety and efficiency.
It provides a testing equipment and power unit system, including a host computer and a control driver, through which the host computer issues test commands, controls the driver to output driving signals, and directly tests the power unit, avoids manual operation, and improves test safety and efficiency.
By conducting direct testing in the converter, the risk of damage during the transport process is avoided, the testing process is simplified, the testing safety and efficiency are improved, and the risk of manual operation is reduced.
Smart Images
Figure CN222939244U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electric power, in particular to a test device and a power unit system. Background Art
[0002] In the related art, after the production of the power unit is completed, the power unit needs to be transported to the test environment; in the test environment, the tester uses the single-power-unit double-pulse test method to test the power unit. After the test, the power unit is installed in the converter. In the above process, transporting the power unit may cause damage to the power unit; when testing the power unit, each power unit needs to be tested one by one, and the tester needs to adjust the probe, voltage, inductor, etc., the operation is cumbersome and there is a risk of electric shock, and the test safety and efficiency are relatively low. Summary of the Utility Model
[0003] In view of this, the purpose of the utility model is to provide a test device and a power unit system to improve the test safety and test efficiency.
[0004] In a first aspect, an embodiment of the utility model provides a test device, which includes: a host computer and a control driver; the host computer is communicatively connected to the control driver; the control driver is used to connect to the power unit; the host computer is used to: output a test instruction to the control driver; wherein, the test instruction includes: a wave generation mode and / or a trigger sequence; the control driver is used to: input the test instruction, output a drive signal to the power unit to drive the power tubes in the power unit to operate; the control driver is also used to: collect the operating parameters when the power tubes are operating.
[0005] The above control driver includes a controller and a driver; the controller is connected to the host computer, and the driver is connected to the power unit; the controller is used to: input the test instruction and output a pulse width modulation wave signal; the driver is used to: input the pulse width modulation wave signal and output a drive signal to the power unit.
[0006] The above driver is installed in the converter, and the power unit is installed in the converter.
[0007] The above driver is connected to multiple power units; or, the controller is connected to multiple drivers, and the drivers are connected to the corresponding power units.
[0008] The above driver is also used to: when the operating parameters indicate a power unit failure, stop outputting the drive signal and output a first failure signal to the controller.
[0009] The above controller is also used to: receive the first failure signal, stop outputting the pulse width modulation wave signal, and output a second failure signal to the host computer.
[0010] The above host computer is further configured to: receive a second fault signal and display fault information corresponding to the second fault signal.
[0011] In a second aspect, an embodiment of the present invention provides a power unit system, which includes the above test equipment and further includes a power unit.
[0012] The above power unit includes a plurality of arm branches; the plurality of arm branches are connected in parallel; a positive level and a negative level are respectively input to both ends of the arm branch.
[0013] The above power unit includes three arm branches, and each arm branch inputs one - phase electric energy in an AC power supply.
[0014] The embodiment of the present invention brings the following beneficial effects:
[0015] The above test equipment and power unit system include a host computer and a control driver; the host computer is communicatively connected to the control driver; the control driver is used to connect to the power unit; the host computer is used to: output a test instruction to the control driver; wherein, the test instruction includes: a wave - generating mode and / or a trigger sequence; the control driver is used to: input the test instruction, output a driving signal to the power unit to drive the power tubes in the power unit to operate; the control driver is further used to: collect the operating parameters when the power tubes are operating.
[0016] In the above - mentioned manner, after the power unit is installed in the converter, the power unit can be tested by the test equipment, avoiding possible damage to the power unit during the transportation process; by sending a test instruction from the host computer and sending a driving signal to the power unit through the control driver, the test of the power unit can be completed without the need for testers to operate in the test environment, improving the test safety and test efficiency.
[0017] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention are achieved and obtained by the structures specifically pointed out in the specification, the claims, and the drawings.
[0018] To make the above - mentioned objectives, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are specifically described below in conjunction with the accompanying drawings. Description of the Drawings
[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0020] Figure 1 Structural schematic diagram of a test device provided by an embodiment of the present invention;
[0021] Figure 2 Specific structural schematic diagram of a test device provided by an embodiment of the present invention;
[0022] Figure 3 Schematic layout diagram of a three-phase power unit under three levels provided by an embodiment of the present invention;
[0023] Figure 4 Schematic layout diagram of a power unit of an H-bridge topology under three levels provided by an embodiment of the present invention;
[0024] Figure 5 Schematic diagram of a three-level positive double-pulse test framework provided by an embodiment of the present invention;
[0025] Figure 6 Schematic layout diagram of a three-phase power unit under two levels provided by an embodiment of the present invention;
[0026] Figure 7 Schematic layout diagram of a power unit of an H-bridge topology under two levels provided by an embodiment of the present invention;
[0027] Figure 8 Schematic diagram of a two-level positive double-pulse test framework provided by an embodiment of the present invention;
[0028] Figure 9 Schematic structural diagram of a converter for two-level double-pulse test provided by an embodiment of the present invention;
[0029] Figure 10 Schematic structural diagram of a converter for three-level double-pulse test provided by an embodiment of the present invention;
[0030] Figure 11 Schematic diagram for functional description of each part in a power unit system provided by an embodiment of the present invention. Specific embodiments
[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative efforts fall within the protection scope of the present utility model.
[0032] In the related art, the power unit is also called a module, and the module is often tested by the single-module double-pulse test method. In the single-module double-pulse test, after the module is produced, it needs to be transported to the test environment for testing, and then installed in the converter after the test. During the transportation and installation process, the module may be damaged, and the risk is uncontrollable. In addition, during the test process, the single-module double-pulse test requires the tester to manually adjust the probe, adjust parameters such as voltage and inductance, which is relatively cumbersome. Since there is high voltage in the test environment, the tester is at high risk.
[0033] Based on the above problems, a test device and a power unit system provided by the embodiments of the present utility model can be applied to the testing of power units of various structures.
[0034] First, refer to Figure 1 the structural schematic diagram of a test device shown in the figure; the test device includes: a host computer 10 and a control driver 12; the host computer is communicatively connected to the control driver; the control driver is used to connect to the power unit;
[0035] In this embodiment, after the power unit is produced, it can be directly installed in the converter without being transported to a dedicated test environment; the power unit can be tested in the converter.
[0036] During the test process, the above-mentioned host computer is used to: output a test instruction to the control driver; wherein, the test instruction includes: a wave generation mode and / or a trigger sequence;
[0037] After being operated by the staff, the host computer can output a test instruction, or it can automatically output a test instruction. The above test instruction can only include a wave generation mode, or only include a trigger sequence, or can also include both a wave generation mode and a trigger sequence; the wave generation mode specifically can include a two-level mode, a three-level mode, an NPC (Neutral Point Clamped) mode, an ANPC (Active Neutral Point Clamped) mode, etc.; the trigger sequence specifically can include single trigger, single-phase sequence trigger, three-phase sequence trigger, etc.
[0038] In addition, the host computer can also send startup commands, shutdown commands, etc., to control the startup or shutdown of the power unit.
[0039] The above control driver is used for: inputting a test command, outputting a drive signal to the power unit to drive the power transistors in the power unit to operate;
[0040] The control driver can be connected to the host computer through a communication cable. After the host computer issues a test command, a drive signal matching the test command is generated, and this drive signal can control the power transistors to turn on or off.
[0041] The above control driver is also used for: collecting the operating parameters when the power transistors are operating.
[0042] The operating parameters can include parameters such as the voltage and current of the power transistors. The control driver can determine whether the power transistors are faulty based on the collected operating parameters; when the power transistors are faulty, it can stop outputting the drive signal and report the fault information to the host computer.
[0043] The above test equipment includes a host computer and a control driver; the host computer is communicatively connected to the control driver; the control driver is used to connect to the power unit; the host computer is used for: outputting a test command to the control driver; wherein, the test command includes: a wave generation mode and / or a trigger sequence; the control driver is used for: inputting the test command, outputting a drive signal to the power unit to drive the power transistors in the power unit to operate; the control driver is also used for: collecting the operating parameters when the power transistors are operating.
[0044] In the above method, after the power unit is installed in the converter, the power unit can be tested by the test equipment, avoiding possible damage to the power unit during the transportation process; by the host computer issuing a test command and the control driver issuing a drive signal to the power unit, the test of the power unit can be completed, without the need for testers to operate in the test environment, improving the test safety and test efficiency.
[0045] See Figure 2 The specific structural schematic diagram of a test equipment shown.
[0046] The control driver includes a controller 20 and a driver 21; the controller is connected to the host computer, and the driver is connected to the power unit; the controller is connected to the host computer through a communication cable, and the communication cable is used to transmit the test command.
[0047] The above controller is used for: inputting the test command and outputting a pulse width modulation wave signal; the driver is used for: inputting the pulse width modulation wave signal and outputting a drive signal to the power unit. The pulse width modulation wave signal is also called a PWM signal.
[0048] Further, the above-mentioned driver is installed in the converter, and the power unit is installed in the converter. This driver can also be called a drive board, and both the driver and the power unit are installed in the converter.
[0049] The test equipment in this embodiment can test multiple power units simultaneously. Specifically, the driver is connected to multiple power units; alternatively, the controller is connected to multiple drivers, and the drivers are connected to the corresponding power units.
[0050] When the driver is connected to multiple power units, the host computer can issue test instructions for different power units respectively. The controller then outputs corresponding pulse width modulation wave signals, and then the driver outputs drive signals to the corresponding power units.
[0051] When the controller is connected to multiple drivers, the driver can be connected to one or more power units; the host computer can issue test instructions for different power units respectively. The controller outputs corresponding pulse width modulation wave signals to the corresponding drivers, and then the driver outputs drive signals to the corresponding power units.
[0052] During the test process, the power tubes in the power unit may fail. In this case, the above-mentioned driver is also used to: when the operating parameters indicate a power unit failure, stop outputting drive signals and output a first fault signal to the controller.
[0053] Stopping the output of drive signals is also called wave blocking processing. When the operating parameters indicate a power unit failure, in order to avoid situations such as power tube explosion and damage, the driver immediately stops outputting drive signals; at the same time, it outputs a first fault signal to the controller; the first fault signal may include information such as the fault type of the power unit and the power tubes that have failed.
[0054] The above-mentioned controller is also used to: receive the first fault signal, stop outputting pulse width modulation wave signals, and output a second fault signal to the host computer.
[0055] Stopping the output of pulse width modulation wave signals is also called wave blocking processing. The controller no longer outputs pulse width modulation wave signals to the driver, and at the same time outputs a second fault signal to the host computer; the second fault signal may include information such as the fault type of the power unit and the power tubes that have failed.
[0056] The above-mentioned host computer is also used to: receive the second fault signal and display the fault information corresponding to the second fault signal. This fault information can be displayed on the screen, indicator light or terminal device connected to the host computer to prompt the staff that the power unit has failed.
[0057] The above test equipment can provide double-pulse testing for the whole machine, which is an independent test for non-single power units. After the power unit is installed in the converter, only the wave generation mode needs to be selected according to the model category, such as two-level or three-level mode, NPC or ANPC mode, etc. After online selection, double-pulse testing can be carried out. The selectable trigger sequences include single trigger test, single-phase sequential trigger, three-phase sequential trigger, etc. There are many types of wave generation to choose from, which reduces the labor and man-hour costs, improves work efficiency, and reduces the risk of damage to the module caused by transportation, storage, installation, etc.
[0058] Furthermore, this embodiment also provides a power unit system, which includes a test equipment and also includes a power unit.
[0059] The power unit includes multiple arm branches; the multiple arm branches are connected in parallel; the two ends of the arm branch are respectively input with a positive level and a negative level.
[0060] See Figure 3 The schematic diagram of the three-phase power unit layout under a three-level is shown. In this example, it includes three arm branches, and the three arm branches are connected in parallel. The upper end of the arm branch is input with the positive level shown as '+1'; the lower end of the arm branch is input with the negative level shown as '-1'; in addition, the zero-level shown as '0' is also input at the middle position of the arm branch.
[0061] The above three arm branches include phase A branch, phase B branch and phase C branch; among them, when the phase A branch is the test module, the phase B branch is the accompanying test module; when the phase B branch is the test module, the phase C branch is the accompanying test module; when the phase C branch is the test module, the phase A branch is the accompanying test module. The accompanying test module is used for commutation.
[0062] Figure 4 The schematic diagram of the power unit layout of the H-bridge topology under a three-level is shown. In this example, it includes two arm branches, namely branch A and branch B. Branch A and branch B are connected in parallel. The positive level P is connected to one end of the arm branch, and the negative level N is connected to the other end of the arm branch; in branch A and branch B, the line between D5 and D6 is connected to the zero level 0; the reactors LA and LB are connected between D2 and D3.
[0063] The multiple arm branches need to be tested separately. When testing branch A, branch A is the test module and branch B is the accompanying test module; when testing branch B, branch B is the test module and branch A is the accompanying test module; among them, the accompanying test module is used for commutation.
[0064] In a specific implementation manner, the above power unit includes three arm branches, and each arm branch inputs the electric energy of one phase in the AC power supply.
[0065] Figure 5Shows a schematic diagram of a three-level positive double-pulse test framework. In this example, the host computer is connected to the controller, and the controller sends a control signal, that is, the aforementioned pulse width modulation wave signal, to the drive board, and the drive board is the driver in the aforementioned embodiment. The drive board outputs a drive signal to the power unit. In Figure 5 the power unit, there are a total of three arm branches, namely branch A, branch B, and branch C. The positive level P is connected to one end of the arm branch, and the negative level N is connected to the other end of the arm branch; in branches A, B, and C, the line between D5 and D6 is connected to the zero level 0; AC electrical energy is connected between D2 and D3, where branch A is connected to a phase electrical energy, branch B is connected to b phase electrical energy, and branch C is connected to c phase electrical energy.
[0066] Refer to Figure 6 the schematic diagram of the layout of a three-phase power unit under two levels shown. In this example, there are three arm branches, and the three arm branches are connected in parallel. The upper end of the arm branch inputs the positive level shown as '+1'; the lower end of the arm branch inputs the negative level shown as '-1'.
[0067] The above three arm branches include the A-phase branch, the B-phase branch, and the C-phase branch; among them, when the A-phase branch is the test module, the B-phase branch is the accompanying test module; when the B-phase branch is the test module, the C-phase branch is the accompanying test module; when the C-phase branch is the test module, the A-phase branch is the accompanying test module. The accompanying test module is used for commutation.
[0068] Figure 7 Shows a schematic diagram of the layout of a power unit with a two-level H-bridge topology. In this example, there are two arm branches, namely branch A and branch B. Branch A and branch B are connected in parallel. The positive level P is connected to one end of the arm branch, and the negative level N is connected to the other end of the arm branch; a reactor LA and LB are connected between T1 and T2.
[0069] Multiple arm branches need to be tested separately. When testing branch A, branch A is the test module and branch B is the accompanying test module; when testing branch B, branch B is the test module and branch A is the accompanying test module; among them, the accompanying test module is used for commutation.
[0070] Figure 8 Shows a schematic diagram of a two-level positive double-pulse test framework. In this example, the host computer is connected to the controller, and the controller sends a control signal, that is, the aforementioned pulse width modulation wave signal, to the drive board, and the drive board is the driver in the aforementioned embodiment. The drive board outputs a drive signal to the power unit. In Figure 8In the power unit, there are a total of three arm branches, namely branch A, branch B, and branch C. The positive level P is connected to one end of the arm branch, and the negative level N is connected to the other end of the arm branch; in branches A, B, and C, AC power is connected between T1 and T2, where branch A is connected to e a phase power, branch B is connected to e b phase power, and branch C is connected to e c phase power.
[0071] Considering that both the rectifier unit and the inverter unit in the converter are of three-phase power unit layout, therefore, when implementing the double-pulse test for the whole machine, it needs to be implemented in combination with the layout of the whole machine. Currently, three test schemes can be implemented for this scheme, namely single trigger, single-phase sequential trigger, and three-phase sequential trigger.
[0072] Among them, the single trigger is used for the double-pulse test of a single IGBT (Insulate-Gate Bipolar Transistor), and the IGBT number to be tested can be configured through the host computer; the single-phase sequential trigger is mainly used for the double-pulse test of single-phase IGBTs. For the power unit of the three-level NPC topology circuit, T1, T2, T3, and T4 are tested in sequence; for the power unit of the three-level ANPC topology circuit, T1, T2, T3, T4, T5, and T6 are tested in sequence; for the power unit of the two-level topology circuit, T1 and T2 are tested in sequence.
[0073] During the test, any one of phases A, B, and C to be tested can be configured through the host computer, and the interval time for each test is T d ,T d It can be configured through the host computer. For example: after the test of IGBT1 is completed, after T d time, then test IGBT2, and complete all tests according to the model to be tested.
[0074] During the three-phase sequential trigger process, all IGBTs of the converter complete the double-pulse test of the whole machine. For example, first test IGBT1 of phase A, and after T d time, then test IGBT2 of phase A. According to the topology structure of the converter, after the test of IGBTs of phase A is completed, then test IGBT1, IGBT2, IGBTn of phase B, and IGBT1, IGBT2, IGBTn of phase C in sequence.
[0075] Figure 9 Shows a schematic diagram of the structure of a converter for two-level double-pulse test, Figure 10The schematic diagram of the converter structure for three-level double-pulse test is shown. The converter mainly includes a permanent magnet synchronous generator (PMSG) for the motor, a machine-side switch, a du / dt filter, a machine-side module, a braking unit, a grid-side module, a grid-side filter, a grid-connection switch, a power grid, etc. Both the machine-side module and the grid-side module are power units. The converter can be a doubly-fed converter or a full-power converter.
[0076] Figure 11 The schematic diagram of the function description of each part in the power unit system is shown. The drive board is the driver in the foregoing embodiment, and the double-pulse test unit is the power unit in the foregoing embodiment.
[0077] The host computer first has the functions of starting and stopping the machine, so as to control the start and stop of the power unit; in the starting state, select to enter the double-pulse test platform, and according to the configuration of the whole converter, select the required wave generation mode for the model, such as two-level model topology, three-level model, NPC type, ANPC type, etc.; then the trigger sequence can be selected, such as single trigger, single-phase sequential trigger, three-phase sequential trigger, etc.; selective testing can be carried out according to different concerns, with higher flexibility.
[0078] In addition, parameters can also be set for different module models and different parallel numbers, such as the interval time, turn-on time, turn-off time, etc. of each switching tube. Taking the peak current not exceeding the safe operating area of the module as the standard, the power unit is tested. The host computer has the function of fault monitoring of the power unit, receives feedback information through controller communication, reacts to faults in a timely manner, and stops the machine to read faults.
[0079] The controller communicates with the host computer and responds to the test instructions given by the host computer. For example, select the wave generation mode to be tested, trigger sequence selection, start and stop, etc.; the controller generates a driving PWM signal according to the test instructions, controls the subsequent drive board to issue a driving signal, and enables the power unit to operate stably; when a fault is reported by the drive board, it is necessary to upload it to the controller for processing of the signal blocking signal of the control signal, further protecting the whole machine, and uploading the fault problem to the host computer for processing.
[0080] For the double-pulse test, the drive board not only needs to receive the PWM signal from the front-end controller and normally drive the operation of the subsequent power unit, such as the operation of the switching tube. In addition, when the power unit encounters faults, such as short circuit, undervoltage and other faults, the drive board starts the undervoltage or short-circuit protection function, will immediately protect the circuit, perform instant wave blocking processing, prevent the expansion of the power unit failure, and protect the damage of the switching tube. The drive board displays the fault type through an indicator light, which is convenient for on-site fault type positioning. At the same time, the fault information is uploaded to the controller and then communicated to the host computer, which is convenient for the operator to identify the fault.
[0081] The test equipment and power unit system provided in this embodiment reduce the risks of transportation, installation, etc. brought by single-module testing; through the double-pulse testing of the whole machine, the testing efficiency is improved; multiple testing mode selections can be used to test and evaluate single or multiple modules; for the faults existing in the double-pulse stage, wave blocking will be immediately processed and uploaded to the host computer for processing, which is convenient for operation.
[0082] In addition, in the description of the embodiments of the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.
[0083] If the above functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.
[0084] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0085] Finally, it should be noted that the above embodiments are only specific implementation manners of the present utility model, used to illustrate the technical solutions of the present utility model, rather than limiting it. The protection scope of the present utility model is not limited thereto. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art within the technical scope disclosed by the present utility model can still modify the technical solutions recorded in the foregoing embodiments or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model, and should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.
Claims
1. A testing device, characterized in that: The test equipment comprises: a host computer and a control driver; the host computer is in communication connection with the control driver; the control driver is used to connect to the power unit; The host computer is used to: output a test instruction to the control driver; wherein the test instruction includes: a wave mode and / or a trigger sequence; The control driver is used to: input the test instruction and output a drive signal to the power unit to drive the power tube in the power unit to operate; The control driver is also used to collect operating parameters of the power tube during operation.
2. The test device according to claim 1, characterized in that The control driver comprises a controller and a driver; the controller is connected to the host computer, and the driver is connected to the power unit; The controller is used to: input the test instruction and output a pulse width modulation wave signal; The driver is used to: input the pulse width modulation wave signal and output a driving signal to the power unit.
3. The testing device according to claim 2, characterized in that The driver is installed in a converter; and the power unit is installed in the converter.
4. The testing device according to claim 2, characterized in that The driver is connected to a plurality of power units; Alternatively, the controller is connected to a plurality of drivers, and the drivers are connected to corresponding power units.
5. The testing device according to claim 2, characterized in that The driver is also used to: When the operating parameter indicates that the power unit is faulty, the output of the drive signal is stopped, and a first fault signal is output to the controller.
6. The testing device according to claim 5, characterized in that The controller is also used for: The first fault signal is received, the output of the pulse width modulation wave signal is stopped, and a second fault signal is output to the host computer.
7. The testing device according to claim 6, characterized in that The host computer is also used for: The second fault signal is received, and fault information corresponding to the second fault signal is displayed.
8. A power unit system, characterized in that: The system comprises the testing device according to any one of claims 1 to 7, and further comprises a power unit.
9. The system according to claim 8, characterized in that The power unit comprises a plurality of bridge arm branches; the plurality of bridge arm branches are connected in parallel; and the two ends of the bridge arm branches are respectively input with a positive electrode level and a negative electrode level.
10. The system according to claim 9, characterized in that The power unit comprises three bridge arm branches, each of which inputs one-phase electrical energy from an AC power source.