Power-on and power-off testing device and frequency converter

Abstract

The utility model provides a power-on and power-off test device and a frequency converter, and the device comprises a power-on and power-off switch module which is connected with a to-be-tested frequency converter and carries out the power-on and power-off operation of the to-be-tested frequency converter; the display control module is respectively connected with the power-on and power-off switch module and the frequency converter to be tested; the temperature control module is connected with the display control module; and the discharging module is respectively connected with the display control module, the temperature control module and the frequency converter to be tested. According to the test architecture provided by the invention, the control mainboard uniformly coordinates the state of the power-on switch device and the number of power-on and power-off cycle times and sends the operation instruction of the frequency converter, the same time reference is adopted, unnecessary cycle time waiting caused by inconsistent time references is avoided, the power-on and power-off test efficiency is improved, and a test system fault is avoided.

Description

Technical Field

[0001] This application belongs to the technical field of equipment testing, and relates to a testing device, particularly a power-on / off testing device and a frequency converter. Background Technology

[0002] During the development and design of frequency converters, reliability testing is required, among which frequent power-on / off testing is particularly critical. This test simulates possible scenarios that might occur with the user.

[0003] For this test, two control systems are currently used in conjunction to complete the power-on and power-off tests. The first system controls the inverter's timed power-on and power-off, as well as the number of cycles. This system mainly consists of an AC contactor and its controller, and a cycle timer. The second system controls the inverter's operation. After the PC (Personal Computer) detects that the inverter is operating normally, it sends a start command to control the inverter's operation. When the two systems operate independently, it is difficult to keep the inverter operation control and cycle counting timing synchronized. If the cycle count ends during inverter operation, the inverter power will be disconnected, causing test abnormalities. To solve this problem, the cycle timing period needs to be extended to ensure coverage of the inverter's operation time, reducing test efficiency and making synchronization difficult. Furthermore, when a fault occurs during testing, it is difficult to quickly pinpoint the stage of the fault, increasing the difficulty of fault analysis and reducing work efficiency. Utility Model Content

[0004] This application provides a power-on / off testing device and a frequency converter to solve the problems of ensuring the uniformity of the test time reference axis, improving test efficiency, reducing test costs, and providing effective support for subsequent fault analysis during the power-on / off testing of the frequency converter.

[0005] In a first aspect, this application provides a power-on / off testing device, the device comprising: a power-on / off switch module connected to a frequency converter under test (FDUT) for powering on / off operations on the FDUT; a display control module connected to both the power-on / off switch module and the FDUT; a temperature control module connected to the display control module; and a discharge module connected to the display control module, the temperature control module, and the FDUT.

[0006] In one implementation of the first aspect, the display control module includes a display panel and a control motherboard; the display panel and the control motherboard are connected, and the display panel is a touch screen type panel; the control motherboard is provided with a USB (Universal Serial Bus) interface, which serves as a test data export port.

[0007] In one implementation of the first aspect, the temperature control module includes a heating unit, a temperature detection unit, and a heat dissipation unit; the heating unit, the temperature detection unit, and the heat dissipation unit are respectively connected to the display control module.

[0008] In one implementation of the first aspect, the heating unit includes a PTC (Positive Temperature Coefficient) heating device, and the heat dissipation unit includes a cooling fan; both the PTC heating device and the cooling fan are connected to the display control module.

[0009] In one implementation of the first aspect, the power-on / off switch module includes a first AC contactor; the first AC contactor is connected to the inverter under test, and the power-on / off operation of the inverter under test is realized by the engagement and disengagement of the first AC contactor.

[0010] In one implementation of the first aspect, the discharge module includes a discharge switch and a discharge resistor; the discharge switch is connected in series in the circuit between the discharge resistor and the electrolytic capacitor of the bus of the inverter under test.

[0011] In one implementation of the first aspect, the discharge switch includes a second AC contactor; when the second AC contactor is engaged, the discharge resistor is connected to both ends of the bus electrolytic capacitor for rapid discharge.

[0012] In one implementation of the first aspect, the device further includes: a power supply module; a first input terminal of the power-on / off switch module is connected to the power supply module, and a second input terminal is connected to the display control module; the output terminal of the power-on / off switch module is connected to the inverter under test.

[0013] In one implementation of the first aspect, the load terminal of the inverter under test is connected to a running load, and the load enters the running state after the inverter under test is powered on.

[0014] Secondly, this application provides a frequency converter that uses the aforementioned device to perform power-on and power-off tests.

[0015] As described above, the power-on / off testing device and frequency converter described in this application have the following beneficial effects:

[0016] The test circuit structure of this application enables the control motherboard to uniformly control the power-on switch status, the number of power-on / off cycles, and send inverter operation commands. By using the same time base, unnecessary cycle time waiting caused by inconsistent time bases is avoided, thus improving test efficiency and preventing test system failures.

[0017] The display panel in the test circuit structure of this application can accurately record the test stage of the fault, which facilitates the location of the faulty circuit and program, reduces the difficulty of fault analysis, and improves the efficiency of fault analysis.

[0018] The discharge module in the test circuit structure of this application can ensure that the test object starts the next power-on cycle only after the bus capacitor is completely discharged, thus shortening the discharge time and further improving the test efficiency. Attached Figure Description

[0019] Figure 1 The diagram shown is a structural connection diagram of the power-on / off testing device described in an embodiment of this application.

[0020] Figure 2 The diagram shown is a schematic diagram of the power-on / off testing device described in an embodiment of this application.

[0021] Figure 3 The diagram shown is a first circuit structure diagram of the power-on / off testing device described in an embodiment of this application.

[0022] Figure 4 The diagram shown is a functional structure diagram of the control motherboard of the power-on / off testing device described in the embodiments of this application.

[0023] Figure 5 The diagram shown is a second circuit structure diagram of the power-on / off testing device described in an embodiment of this application.

[0024] Figure 6 The diagram shown is a structural connection diagram of the frequency converter described in the embodiment of this application.

[0025] Component designation explanation

[0026] 1 Power-on / off testing device

[0027] 11 Power on / off switch module

[0028] 12 Display Control Module

[0029] 13 Temperature control module

[0030] 14 Discharge Module Detailed Implementation

[0031] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0032] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. Therefore, the illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0033] The technical solutions in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0034] Please see Figure 1 The diagram shows the structural connection of the power-on / off testing device described in an embodiment of this application. Figure 1 As shown, this embodiment provides a power-on / off testing device 1, which specifically includes: a power-on / off switch module 11, a display control module 12, a temperature control module 13, and a discharge module 14.

[0035] The power-on / off switch module 11 is connected to the inverter under test and performs power-on / off operations on the inverter under test.

[0036] The display control module 12 is connected to the power-on / off switch module 11 and the inverter under test, respectively.

[0037] The temperature control module 13 is connected to the display control module 12.

[0038] The discharge module 14 is connected to the display control module 12, the temperature control module 13, and the inverter under test, respectively.

[0039] In one embodiment, the discharge module is a discharge device, which includes a discharge switch and a discharge resistor.

[0040] The discharge switch is connected in series in the circuit of the discharge resistor and the electrolytic capacitor of the bus of the inverter under test.

[0041] Please see Figure 2 The diagram shows the structural principle of the power-on / off testing device described in the embodiments of this application. Figure 2 As shown, the discharge device 14 includes a discharge switch 141 and a discharge resistor 142.

[0042] The discharge switch 141 is connected in series in the circuit of the discharge resistor 142 and the electrolytic capacitor of the bus of the inverter under test.

[0043] In one embodiment, the device further includes a power module.

[0044] The first input terminal of the power-on / off switch module is connected to the power supply module, and the second input terminal is connected to the display control module; the output terminal of the power-on / off switch module is connected to the inverter under test.

[0045] like Figure 2 As shown, the device 1 further includes a power supply module 15. The first input terminal of the power-on / off switch module 11 is connected to the power supply module 15, and the second input terminal is connected to the display control module 12; the output terminal of the power-on / off switch module 11 is connected to the inverter under test.

[0046] Please continue reading. Figure 2 ,like Figure 2 As shown, in one embodiment, the load terminal of the inverter under test is connected to the running load, and the load enters the running state after the inverter under test is powered on.

[0047] Please see Figure 3 The diagram shows the first circuit structure of the power-on / off testing device described in this application embodiment. Figure 3 As shown, the display control module includes a display panel and a control motherboard.

[0048] The display panel is connected to the control motherboard, and the display panel is a touch screen type panel.

[0049] The control motherboard is equipped with a USB interface, which serves as a test data export port.

[0050] In one embodiment, the temperature control module includes a heating unit, a temperature detection unit, and a heat dissipation unit.

[0051] The heating unit, the temperature detection unit, and the heat dissipation unit are respectively connected to the display control module.

[0052] like Figure 3 As shown, the heating unit includes a PTC heating device, and the heat dissipation unit includes a cooling fan; both the PTC heating device and the cooling fan are connected to the display control module. The temperature control device is used to adjust the ambient temperature of the area where the frequency converter is located. It can easily adjust the ambient temperature of the area where the frequency converter is located, and is set and displayed in real time by the display panel. It does not participate in the power-on / off cycle of the frequency converter.

[0053] In a practical application, the power switch module includes a first AC contactor.

[0054] The first AC contactor is connected to the inverter under test, and the power-on and power-off operations of the inverter under test are realized by the engagement and disengagement of the first AC contactor.

[0055] In a practical application, the discharge switch includes a second AC contactor.

[0056] When the second AC contactor is engaged, the discharge resistor is connected to both ends of the bus electrolytic capacitor to rapidly discharge the bus electrolytic capacitor of the inverter under test.

[0057] Combination Figure 3 As shown, the power-on / off testing device is housed in a cabinet divided into two areas. Area one contains the display and control device, power-on switch, control motherboard, USB interface, input interface, and load interface. Area two contains the inverter under test, temperature control device (including PTC heating device and heat dissipation device), discharge device, and control switch. The inverter load refers to the load borne by the motor controlled by the inverter. For air conditioning systems, the inverter load mainly includes the chilled water pump, cold water pump, and fan.

[0058] The main functions of the display panel include:

[0059] (1) Communicate with the control motherboard, configure the inverter communication protocol, and adapt to different inverter models. Different customers' main control boards use different communication protocols. For example, the baud rate, parity bit, and register function definitions are different. When testing with different products, the communication protocol needs to be adapted and adjusted accordingly.

[0060] (2) Communicate with the control motherboard, configure the power-on switch device and cycle time information, and control the operation and stop of the frequency converter.

[0061] (3) Display the number of cycles and cycle status, and display the inverter operating information (input voltage, input current, bus voltage, output current, PIM temperature, test faults, etc.).

[0062] (4) Test data export function. The exported data includes the following types: number of cycles, voltage, current, temperature information, and fault information during the test.

[0063] Please see Figure 4 The diagram shows the functional structure of the control motherboard of the power-on / off testing device described in this application embodiment. Figure 4 As shown, the main functions implemented by the control motherboard include:

[0064] (1) Control the opening and closing of the power-on switch device to power on or off the frequency converter, such as... Figure 4 The control circuit of the switching device.

[0065] (2) Control the engagement and disengagement of the discharge device to connect or disconnect the discharge resistor, thereby enabling the inverter to perform rapid discharge. Figure 4The discharge device control circuit 1, discharge device control circuit 2 and discharge device control circuit 3.

[0066] (3) Control the temperature control device to turn on and off, and adjust the ambient temperature of the area where the frequency converter is located, such as Figure 4 The heat dissipation device control circuit 1, heat dissipation device control circuit 2, heat dissipation device control circuit 3 and heat dissipation device control circuit 4, and the PTC heating device control circuit 1, PTC heating device control circuit 2, PTC heating device control circuit 3 and PTC heating device control circuit 4.

[0067] (4) Control the current and time of the frequency converter operation, such as Figure 4 The rectification and SMPS (Switched-Mode Power Supply) circuit and MCU (Microcontroller Unit) control circuit.

[0068] (5) Communicate with the display panel to transmit and save test data, such as Figure 4 The inverter 1 communication circuit, inverter 2 communication circuit, inverter 3 communication circuit, inverter communication circuit, display panel communication circuit and USB interface circuit.

[0069] Combination Figures 1 to 4 The power-on / off testing device operates as follows:

[0070] (1) The display panel is configured with a communication protocol that is compatible with the product under test and the corresponding control motherboard.

[0071] (2) The display panel is configured with the number of cycles N, power-on time T1, and power-off time T3.

[0072] (3) The display panel is configured to show the inverter's operating current C and time T2 (T2 < T1), and discharge time T4 (T4 < T3).

[0073] (4) The power-on / off test of the display panel control begins.

[0074] (5) When the main board receives the instruction, it controls the power-on switch to close for a specified time T1.

[0075] (6) After the control motherboard detects that the inverter communication is normal, it sends the inverter to run according to the set current C and time T2.

[0076] (7) After the main board detects that the inverter power-on time T1 has arrived, it disconnects the power-on switch and enters the power-off time T3.

[0077] (8) At the same time, control the main board to connect to the discharge device, and the working time is T4 to quickly discharge the bus capacitor.

[0078] (9) After the main board detects that the inverter power failure time T3 has been reached, it re-engages the power-on switch and enters the next cycle.

[0079] If a problem occurs at any of the above steps during the power-on / off test, the test must be exited, and the stage at which the error occurred should be displayed on the display panel. Below are examples of faults that may occur at each test stage:

[0080] Fault 1: In step (2), if the power-on process is terminated before the engagement time is T1, it may be due to a problem with the timing device on the control board. It is necessary to check whether the timing function is normal.

[0081] Fault 2: In step (3), if the frequency converter cannot operate normally after being powered on, it may be due to abnormal function of the frequency converter itself or a problem with the load connection. These two parts need to be checked.

[0082] Fault 3: If the inverter cannot power off normally in step (4), it may be due to a problem with the power supply device. The AC contactor cannot disconnect stably, and this part needs to be checked.

[0083] Fault 4: In step (5), if the bus voltage discharge time is long, it may be due to the stable connection of the discharge device to the circuit, and this part needs to be checked.

[0084] Fault 5: In step (6), if the power-off process is terminated before the power-off time is T3, it may be due to a problem with the timing device on the control board. It is necessary to check whether the timing function is normal.

[0085] by Figure 3 The following are examples of frequency converter products:

[0086] (1) Configure one of the communication protocols applicable to the main control board on the display panel.

[0087] (2) Configure the display panel to have a cycle count of 100,000, a power-on time of 60 seconds, and a power-off time of 60 seconds.

[0088] (3) Configure the inverter operating current to 20A, operating time to 30s, and discharge time to 30s on the display panel.

[0089] (4) Set the test to start in the display panel.

[0090] (5) After receiving the instruction, the power-on device in control area 1 will engage for 60 seconds.

[0091] (6) After the main board detects that the inverter is working normally, it sends a running command to the inverter, controls the inverter current to 20A and the running time to 30s.

[0092] (7) After the main board detects that the power-on time of 60s has been reached, it disconnects the power-on device and enters a 60s discharge time.

[0093] (8) At the same time, control the discharge device in the motherboard access area 2 to quickly discharge the bus capacitor for 30 seconds.

[0094] (9) After the main board detects that the power-off time of 60s has been reached, it will re-control the power-on device in area 1 to engage and enter the next test cycle.

[0095] It should be noted that the above embodiment mainly describes a single test object, but multiple objects can be tested in the future. To enable simultaneous testing of multiple test objects, the software needs to be adjusted to add communication interface functions for multiple frequency converters and a discharge device to accommodate multiple test objects. Simultaneously, the structural part needs to replicate region 2, placing one test sample in each region.

[0096] Please see Figure 5 The diagram shown is a second circuit structure diagram of the power-on / off testing device described in an embodiment of this application. Figure 5 The diagram shown illustrates a structure where multiple test objects are involved in the power-on / off testing. Figure 5 The test includes test object 1, test object 2, ... test object N. Multiple inverters under test are used as test objects and are subjected to power-on / off testing, temperature control, and discharge control through the same display and control module (control motherboard + display panel).

[0097] Please see Figure 6 The diagram shows the structural connection of the frequency converter described in the embodiment of this application. Figure 6 As shown, this embodiment provides a frequency converter, which uses the aforementioned device to perform power-on and power-off tests.

[0098] The device includes: a power-on / off switch module connected to the inverter under test (UDT) for powering on / off operations on the UDT; a display control module connected to both the power-on / off switch module and the UDT; a temperature control module connected to the display control module; and a discharge module connected to the display control module, the temperature control module, and the UDT.

[0099] like Figure 2 As shown, the discharge device 14 includes a discharge switch 141 and a discharge resistor 142.

[0100] The discharge switch 141 is connected in series in the circuit of the discharge resistor 142 and the electrolytic capacitor of the bus of the inverter under test.

[0101] In one embodiment, the device further includes a power module.

[0102] The first input terminal of the power-on / off switch module is connected to the power supply module, and the second input terminal is connected to the display control module; the output terminal of the power-on / off switch module is connected to the inverter under test.

[0103] like Figure 2 As shown, the device 1 further includes a power supply module 15. The first input terminal of the power-on / off switch module 11 is connected to the power supply module 15, and the second input terminal is connected to the display control module 12; the output terminal of the power-on / off switch module 11 is connected to the inverter under test.

[0104] Please continue reading. Figure 2 ,like Figure 2 As shown, in one embodiment, the load terminal of the inverter under test is connected to the running load, and the load enters the running state after the inverter under test is powered on.

[0105] like Figure 3 As shown, the display control module includes a display panel and a control motherboard.

[0106] The display panel is connected to the control motherboard, and the display panel is a touch screen type panel.

[0107] The control motherboard is equipped with a USB interface, which serves as a test data export port.

[0108] In one embodiment, the temperature control module includes a heating unit, a temperature detection unit, and a heat dissipation unit.

[0109] The heating unit, the temperature detection unit, and the heat dissipation unit are respectively connected to the display control module.

[0110] like Figure 3 As shown, the heating unit includes a PTC heating device, and the heat dissipation unit includes a cooling fan; both the PTC heating device and the cooling fan are connected to the display control module.

[0111] In a practical application, the power switch module includes a first AC contactor.

[0112] The first AC contactor is connected to the inverter under test, and the power-on and power-off operations of the inverter under test are realized by the engagement and disengagement of the first AC contactor.

[0113] In a practical application, the discharge switch includes a second AC contactor.

[0114] When the second AC contactor is engaged, the discharge resistor is connected to both ends of the bus electrolytic capacitor for rapid discharge.

[0115] In the several embodiments provided in this application, it should be understood that the disclosed apparatus can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of modules / units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or units may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection of the apparatus or module or unit may be electrical, mechanical, or other forms.

[0116] The modules / units described as separate components may or may not be physically separate. The components shown as modules / units may or may not be physical modules; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules / units can be selected to achieve the objectives of the embodiments of this application, depending on actual needs. For example, the functional modules / units in the various embodiments of this application may be integrated into one processing module, or each module / unit may exist physically separately, or two or more modules / units may be integrated into one module / unit.

[0117] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0118] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A power-on / off testing device, characterized in that, The device includes: The power-on / off switch module is connected to the inverter under test and performs power-on / off operations on the inverter under test. The display control module is connected to the power on / off switch module and the inverter under test, respectively; The temperature control module is connected to the display control module; The discharge module is connected to the display control module, the temperature control module, and the inverter under test, respectively.

2. The apparatus according to claim 1, characterized in that, The display control module includes a display panel and a control motherboard; The display panel is connected to the control motherboard, and the display panel is a touch screen type panel; The control motherboard is equipped with a USB interface, which serves as a test data export port.

3. The apparatus according to claim 1, characterized in that, The temperature control module includes a heating unit, a temperature detection unit, and a heat dissipation unit; The heating unit, the temperature detection unit, and the heat dissipation unit are respectively connected to the display control module.

4. The apparatus according to claim 3, characterized in that: The heating unit includes a PTC heating device, and the heat dissipation unit includes a cooling fan; both the PTC heating device and the cooling fan are connected to the display control module.

5. The apparatus according to claim 1, characterized in that, The power switch module includes a first AC contactor; The first AC contactor is connected to the inverter under test, and the power-on and power-off operations of the inverter under test are realized by the engagement and disengagement of the first AC contactor.

6. The apparatus according to claim 1, characterized in that, The discharge module includes: a discharge switch and a discharge resistor; The discharge switch is connected in series in the circuit of the discharge resistor and the electrolytic capacitor of the bus of the inverter under test.

7. The apparatus according to claim 6, characterized in that, The discharge switch includes a second AC contactor; When the second AC contactor is engaged, the discharge resistor is connected to both ends of the bus electrolytic capacitor for rapid discharge.

8. The apparatus according to claim 1, characterized in that, The device further includes: a power module; The first input terminal of the power-on / off switch module is connected to the power supply module, and the second input terminal is connected to the display control module; the output terminal of the power-on / off switch module is connected to the inverter under test.

9. The apparatus according to claim 1, characterized in that: The load terminal of the inverter under test is connected to the running load, and the load enters the running state after the inverter under test is powered on.

10. A frequency converter, characterized in that, The inverter is tested for power-on and power-off using the device described in any one of claims 1 to 9.

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