Portable frequency converter trigger board tester

Abstract

The utility model provides a portable frequency converter trigger board tester. The portable frequency converter trigger board tester comprises a portable casing, a tester power board and a test mainboard, wherein the tester power board and the test mainboard are arranged in the portable casing. The power panel provides a working power supply for the to-be-tested trigger board. The test mainboard is provided with: a signal generator for providing a trigger signal for a to-be-tested frequency converter trigger board; and the signal processing module is used for collecting and processing output signals of the to-be-tested frequency converter trigger board and finally reflecting the output signals outside the tester shell, so that whether the to-be-tested frequency converter trigger board is normal or not can be conveniently judged. By adopting the portable frequency converter trigger board tester, the maintenance time of the frequency converter can be saved, the reliability of the frequency converter after maintenance can be improved, and the efficiency and the safety of electronic professionals in a workshop for maintaining the trigger board can be improved.

Description

Technical Field

[0001] The utility model relates to a portable frequency converter trigger board tester. Background Art

[0002] FUJI VG7 series inverters are widely used in cranes at ports, traction machines of rail locomotives, and various manufacturing equipment with speed regulation functions. FUJI VG7 series inverters are widely used, and the trigger board isolates and amplifies the control signal of the switch IGBT on the main board of the FUJI VG7 inverter and outputs it to the IGBT to achieve on-off control of the IGBT.

[0003] When a fault occurs in the FUJI VG7 series inverter, such as a major fuse failure (DCF) on the DC bus, IGBT burnout, or equipment jitter, in addition to testing the IGBT on the main circuit, the trigger board on the control circuit must also be tested to determine whether its function is normal.

[0004] The current practice is for on-site maintenance personnel to disassemble the trigger board and transport it to a professional workshop, where electronic professionals will conduct inspection and maintenance. Since each trigger board has 12 output channels, on-site maintenance personnel must mark the 12 connectors connecting the wires to the board before disassembling the trigger board. Each FUJI VG7 inverter of a high-power port machine has three trigger boards. Therefore, the removal and installation of the trigger board is quite time-consuming; in addition, the connector pins are easily damaged during transportation and storage; there is also a risk of unstable operation of the inverter during reinstallation after inspection.

[0005] In addition, it takes a lot of time for electronic professionals in the workshop to inspect and repair the trigger board. Since each trigger board has 12 output channels, electronic maintenance personnel must build 12 analog test circuits online to track and detect whether each output channel is normal. At the same time, building test circuits online also poses safety hazards, because maintenance personnel need to provide a DC working power supply of more than 300VDC for the trigger board, and then build a test circuit on a bare board with more than 300VDC, which is prone to the risk of maintenance personnel being electrocuted or various instrument probes causing short circuits on the circuit board. Utility Model Content

[0006] In order to save the maintenance time of the inverter, improve the reliability of the inverter after maintenance, and improve the efficiency and safety of the trigger board maintenance by the electronic professionals in the workshop, the utility model provides a inverter trigger board tester, which performs the trigger board detection link on the machine, and does not need to disassemble and repair all the trigger boards in the inverter, but only needs to disassemble and replace the abnormal trigger board; the electronic professional maintenance personnel in the workshop can use the utility model to quickly and intuitively determine the fault content of the trigger board, such as whether it is a power failure or a specific channel failure, narrow the scope of the fault, and then perform targeted maintenance. After maintenance, the utility model can be used to quickly determine whether the fault has been eliminated. There is no need to build a test circuit for all channels online, which is both safe and time-saving.

[0007] The technical solution adopted by the utility model to achieve its technical purpose is: a portable inverter trigger board tester, including a portable housing and a test mainboard and a power board arranged in the portable housing; the test mainboard is provided with:

[0008] A signal generator that provides a trigger signal for the inverter trigger board to be tested; the signal generator generates a 3.3V DC voltage signal;

[0009] A signal acquisition and processing module for acquiring the output signal of the inverter trigger board to be tested and processing the acquired output signal of the inverter trigger board to be tested;

[0010] The input and output signals of the trigger board to be tested are used to determine whether the trigger board to be tested is normal, and the LED is used to display the information on the housing. Figure 2 .

[0011] Furthermore, in the above-mentioned portable inverter trigger board tester: a power board for providing a DC power supply to the inverter trigger board to be tested is also included in the portable housing.

[0012] In the above-mentioned portable inverter trigger board tester: an audible and visual alarm device for displaying the working status of the power board is also provided.

[0013] In the above-mentioned portable inverter trigger board tester: an on-off switch is also arranged on the power board for user-friendly operation.

[0014] The use of the portable inverter trigger board tester of the utility model can save the inverter maintenance time, improve the reliability of the inverter after maintenance, and improve the efficiency and safety of the trigger board maintenance by electronic professionals in the workshop.

[0015] The present invention is further described below in conjunction with the accompanying drawings and specific implementations. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1This is a functional block diagram of a portable inverter trigger board tester according to Embodiment 1 of the utility model;

[0017] Attached Figure 2 This is a test principle diagram of a portable inverter trigger board tester according to Example 1 of the utility model. DETAILED DESCRIPTION

[0018] This embodiment is a portable inverter trigger board tester, which is a portable device and must be small in size for easy carrying.

[0019] In the inverter, there are a main board and a trigger board on the control circuit of the inverter, and an IGBT on the main circuit of the inverter. The signal given on the inverter main board to control the IGBT is a micro signal, which is not enough to drive a large number of IGBTs, and the trigger board is needed to amplify the signal. Each FUJI VG7 inverter of a high-power port machine has three trigger boards, each of which has 12 output channels and can drive 36 IGBTs. At the same time, in order to protect the main board, the signal needs to be isolated. Therefore, the trigger board drives the IGBT after isolating and amplifying the control signal of the main board.

[0020] The portable inverter trigger board tester is used to test the trigger board to see if it has any faults. In practice, the trigger board needs to be tested if the inverter fails and cannot be powered on. Powering on will cause damage to the equipment and personnel. Therefore, when the tester of this embodiment is used to test the trigger board, the inverter itself is powered off. Therefore, during the test, the tester needs to supply power to the inverter trigger board to be tested, and there is no need to disassemble the trigger board during the test. You only need to disconnect the relevant connector on the trigger board and connect the connector to the corresponding connector on the tester. The tester can draw power from the 220VAC AC socket, and there is a AC socket on the device.

[0021] If the inverter is not powered, the trigger signal of the trigger board to be tested cannot trigger the IGBT to turn on or off. This is why a tester is needed. The tester simulates the signal of turning on and off the IGBT with an LED drive circuit. Figure 2 As shown, when the signal is to turn on the IGBT, LED1 is on, and when the signal is to turn off the IGBT, LED2 is on.

[0022] In this embodiment, the portable inverter trigger board tester consists of a power board, a test main board, an indicator light for displaying the test results, a connector, and an aluminum box. The power board converts the input 220VAC alternating current into a direct current of about 314VDC to provide a direct current power supply for the inverter trigger board to be tested. Since the power output voltage here is relatively high, considering the safety of the tester, an indicator light and a buzzer that generate sound and light warnings are set on the power board and are externally connected to the tester housing.

[0023] In this embodiment, the portable inverter trigger board tester mainly includes a test main board and a power board. The power board generates the working power required on the inverter trigger board, and the test main board generates a control signal for controlling the IGBT like the signal generated by the inverter main board. The signal does not have the load capacity to drive the IGBT like the signal generated by the inverter main board. The control signal directly enters the trigger board to be tested in the inverter. After being isolated and amplified by the trigger board, the signal output to drive the IGBT is not output to the IGBT during the test, but is collected and tested by the test main board. The collected signal output by the trigger board is tested in the test main board to determine whether the inverter trigger board to be tested is faulty.

[0024] In the present embodiment, the test mainboard of the portable inverter trigger board tester is connected to the connector on the inverter trigger board to be tested through a connector. The trigger signal generator on the test mainboard provides an input signal for the inverter trigger board to be tested. The input signal is a 3.3V DC voltage signal, which is connected to the signal input connector on the trigger board to be tested through a connector. In addition, the test mainboard is connected to the connectors of the 12 output channels of the trigger board to be tested through 12 connectors, and collects the output signals of the 12 output channels. The portable inverter trigger board tester of the present embodiment can judge whether the functions of each output channel of the trigger board to be tested are normal according to the input signal Vin given to the trigger board to be tested, and then according to the output signal Vout of the trigger board to be tested. For details, see Figure 2 When all channels are not functioning properly, it can be determined that there is a problem with the power supply of the trigger board, causing the trigger board to not work properly. When the light of a certain channel is not on or when the input signal is switched, but the light of the channel does not change accordingly, the function of the corresponding channel is not normal.

[0025] like Figure 2 The figure shows the signal schematic diagram of the test mainboard and the trigger board to be tested. Vin is the trigger signal generated by the signal generator in the test mainboard. It is essentially the control signal generated by the analog inverter to control the IGBT. It is a 3.3V DC signal. In principle, the load capacity is small, that is, the output current is very small, and Vout is the output signal after isolation and amplification by the trigger board to be tested. In the practical test process:

[0026] When the test motherboard does not transmit a signal, Vin = 0V, Vout = -5V, and LED2 is turned on and emits light;

[0027] When the test mainboard outputs 3.3V, Vin=3.3V, Vout=15V, and LED1 turns on and emits light.

[0028] Specifically, the test main board of the portable inverter trigger board tester includes:

[0029] A signal generator that generates a trigger signal.

[0030] A signal acquisition circuit for collecting 12 output channel signals of the inverter trigger board under test.

[0031] The signal processing module processes the collected signal and determines whether the trigger board to be tested is normal and displays it outside the casing through LED.

[0032] In this embodiment, the inverter trigger board tester is installed in an integrated lightweight aluminum box, which is not only conducive to the heat dissipation of the internal components of the tester, but also adapts to the complexity of the on-site maintenance work environment. The aluminum box has an external dimension of 130 (length) * 92 (width) * 45 (height), which is comparable to the size of a multimeter. The lightweight design is easy to carry and use. A simple instruction manual is attached to the back of the instrument to facilitate the use of on-site personnel.

[0033] Beneficial effects of a portable inverter trigger board tester implemented in this invention

[0034] 1. A portable inverter trigger board tester, with its lightweight appearance and accurate test results, can provide convenient and reliable services for on-site maintenance of inverters, and also improve the reliability of equipment after maintenance. In the inverter trigger board maintenance project, the trigger board tester is a powerful assistant for electronic maintenance engineers, improving the efficiency and safety of circuit board maintenance.

[0035] 2. Greatly reduce the probability of man-made damage to the trigger board. During the process of removing the trigger board from the equipment, testing it in the workshop, and then installing it on the equipment again after the test, there is a risk that the pins of the connector on the trigger board may be deformed or damaged, resulting in poor contact; or heavy components on the trigger board, such as filter capacitors, may fall off. However, if the inverter trigger board tester is used to test the trigger board directly on the equipment, the above risks can be greatly reduced.

[0036] 3. Improve the overall reliability of the inverter after inspection and maintenance. The installation of any module or circuit board inside the inverter needs to strictly refer to the relevant process requirements, but it is difficult for on-site maintenance personnel to do so. For example, whether the trigger board connector is connected in place, whether the connector is connected completely correctly, whether the connector has static electricity due to improper installation process, etc. These will cause unstable operation of the equipment or cause failures. However, if the trigger board tester is used to test on the machine, the test can be restored immediately, which can minimize the disassembly of the trigger board and greatly improve the operating reliability of the equipment after maintenance.

[0037] 4. The trigger board tester is extremely friendly to electronic maintenance personnel in the workshop. Maintenance personnel only need to plug in the connector to find the fault point of the trigger board at a glance. There is no need to build a 12-way test loop by themselves, which greatly improves the maintenance efficiency.

[0038] 5. Electronic maintenance personnel in the workshop do not need to use the probe of the instrument to test the live circuit board online, which can avoid the risk of electric shock and short circuit of the circuit board. At the same time, the power board that provides power to the trigger board of the trigger board tester is encapsulated in an aluminum box and has an audible and visual alarm, which can effectively prevent maintenance personnel from electric shock.

Claims

1. A portable inverter trigger board tester, comprising a portable housing and a power board and a test main board arranged in the portable housing; characterized in that: The test mainboard is provided with: a signal generator for providing a trigger signal to the inverter trigger board to be tested; A signal acquisition and processing module is used to acquire the output signal of the inverter trigger board under test and process the acquired output signal of the inverter trigger board under test.

2. The portable inverter trigger board tester according to claim 1, characterized in that: The portable housing also includes a power supply board for providing a DC power supply to the inverter trigger board to be tested.

3. The portable inverter trigger board tester according to claim 2, characterized in that: An audible and visual alarm device for displaying the working status of the DC power supply is also provided.

4. The portable inverter trigger board tester according to claim 3, characterized in that: The DC power supply is also provided with an on-off switch for user convenience.

5. The portable inverter trigger board tester according to claim 1, 2 or 3, characterized in that: Also includes indicator lights to display test results.

Images