A portable SCR tester

Abstract

This invention provides a portable SCR tester, comprising a portable housing, a rechargeable lithium battery, and a test motherboard housed within the housing. The rechargeable lithium battery provides power to the tester. The test motherboard includes: a trigger signal generator that generates a trigger signal to activate the SCR under test; a data acquisition circuit that acquires the output signal of the SCR under test; a processing circuit that processes the acquired output signal to determine whether the SCR is normal, open-circuited, or short-circuited; and a display circuit that displays the processing results of the SCR signal processing circuit. Using this portable SCR tester, the SCR module testing process is performed on-site, eliminating the need to disassemble all SCR modules. Only the faulty SCR module needs to be removed and replaced.

Description

Technical Field

[0001] This utility model relates to a portable SCR tester. Background Technology

[0002] SCR stands for Silicon Controlled Rectifier, also known as a thyristor, which is a transistor with controllable unidirectional conductivity. It combines the rectification characteristics of a diode with the control characteristics of a transistor and is widely used in AC voltage regulation, motor control, inverters, and other applications. SCRs are extensively used in port lifting equipment, rail locomotive traction machines, and various manufacturing equipment. In port equipment, SCRs are primarily used in rectifiers.

[0003] When an SCR malfunctions, the current practice is for on-site maintenance personnel to remove the relevant circuit boards controlling the SCR and then transport the SCR to a specialized workshop for testing by electronics professionals. SCR module disassembly and installation is quite time-consuming; furthermore, there is a risk of electrode damage or electrostatic discharge during transportation and storage; and there is also a risk of unstable rectifier operation during reinstallation after testing.

[0004] Furthermore, even electronics professionals in the workshop can only perform simple static tests on SCRs. Further dynamic online testing is quite time-consuming and requires building a test circuit tailored to the characteristics of the SCR. Utility Model Content

[0005] To save rectifier maintenance time and improve the reliability of rectifiers after maintenance, this utility model provides a portable SCR tester. The SCR module testing is performed on-site, eliminating the need to disassemble all SCR modules. Only the SCR modules that malfunction and require replacement need to be disassembled.

[0006] The technical solution adopted by this utility model to achieve its technical objective is: a portable SCR tester, comprising a portable casing and a rechargeable battery and a test motherboard disposed within the portable casing; characterized in that: the test motherboard is provided with: A trigger signal generator that generates a trigger signal to trigger the SCR under test; A signal acquisition and processing module that acquires the output signal and trigger signal of the SCR under test and processes the acquired signals. The signal acquisition and processing module acquires the output signal of the SCR under test, processes the acquired output signal of the SCR under test to determine whether the SCR under test is normal, open circuit or short circuit; and displays the processing result of the SCR signal processing circuit.

[0007] Furthermore, in the aforementioned portable SCR tester: the trigger signal generator is mounted on the test motherboard, including a non-triggered state test module that generates a non-triggered state test signal; a trigger automatic test module that generates a trigger automatic test signal; and a trigger manual test module that generates a trigger manual test signal. The outputs of the non-triggered state test module, the triggered automatic test module, and the triggered manual test module are respectively connected to the gate (G) of the SCR under test via a selection switch T.

[0008] Furthermore, in the aforementioned portable SCR tester: The untriggered state test module is the first regulated output module that generates a 1.8V or 0V voltage signal; The automatic test trigger module is a second voltage regulated output module that generates a 3V voltage signal. The trigger manual test module is a third voltage regulator module that allows manual adjustment to change the output voltage between 0V and 15V.

[0009] Furthermore, in the aforementioned portable SCR tester: The non-triggered state test module adjusts the output voltage according to the specifications of the SCR under test; The automatic test module adjusts the output voltage according to the specifications of the SCR under test; The manual test module is used to observe the trigger voltage value when the SCR is conducting by adjusting the knob.

[0010] Furthermore, in the aforementioned portable SCR tester: when the trigger signal generated by the trigger signal generator is connected to the G terminal of the SCR under test, a gate switch SB1 is connected in series; when the positive terminal of the working power supply is connected to the A terminal of the SCR under test, an SCR-connected LED1 and a buzzer BUZZ1 (LED1 and BUZZ1 are connected in parallel) are also connected in series, as well as an SCR-off switch SB2; a gate switch LED2 is connected between the G terminal and the K terminal of the SCR under test, with the anode of LED2 connected to the K terminal of the SCR under test and the anode of the SCR-connected LED1 connected to the positive terminal of the working power supply.

[0011] Furthermore, the aforementioned portable SCR tester also includes a rechargeable lithium battery within the portable housing to provide DC power to the tester.

[0012] Furthermore, the aforementioned portable SCR tester is also equipped with an audible and visual alarm device that displays the status of the SCR under test and a corresponding trigger signal value.

[0013] Furthermore, in the aforementioned portable SCR tester: a convenient on / off switch is provided on the rechargeable lithium battery circuit, and a corresponding adapter is also provided for convenient charging.

[0014] Furthermore, the aforementioned portable SCR tester also includes indicator lights for displaying test results and an audible alarm device.

[0015] The portable SCR tester of this invention can save maintenance time for equipment rectifiers and improve the reliability of rectifiers after maintenance.

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0017] Appendix Figure 1 This is a block diagram illustrating the principle of the portable SCR tester in Embodiment 1 of this utility model. Appendix Figure 2 This is a schematic diagram of the testing principle of the portable SCR tester in Embodiment 1 of this utility model. Detailed Implementation

[0018] This embodiment is a portable SCR tester. It is a portable device that must be small in size to be easy to carry.

[0019] In this embodiment, the portable SCR tester consists of a rechargeable battery, a test motherboard, indicator lights and an audible alarm device for displaying test results, a voltage display screen for displaying trigger signals, connectors, adjustable knobs, buttons, an aluminum housing, etc.

[0020] In this embodiment, the portable SCR tester mainly consists of a test motherboard and a rechargeable battery. The rechargeable battery power supply circuit is equipped with a user-friendly on / off switch and a corresponding adapter for convenient charging. The battery provides the necessary power for the tester, while the test motherboard generates a trigger signal for the SCR under test and acquires the SCR's output signal. The acquired signal is processed within the test motherboard to determine if the SCR under test is faulty.

[0021] In this embodiment, the test motherboard of the portable SCR tester is connected to the electrodes of the SCR under test via connectors. The trigger signal generator on the test motherboard provides trigger signals to the SCR under test. These trigger signals are DC voltage signals, with three channels: one channel is the voltage for testing in the untriggered state, preset to 1.8V or 0V, which can be adjusted according to the specifications of the SCR under test; another channel triggers the automatic test state, i.e., the trigger voltage is preset to 3V, directly triggering the SCR under test, and this trigger voltage value can be adjusted according to the specifications of the SCR under test; the last channel triggers the manual test, i.e., the trigger voltage is adjustable, allowing observation of the SCR's conduction status and trigger voltage value by adjusting the trigger voltage. These three trigger voltage signals will be collected, processed, and displayed as specific gate trigger voltage values ​​when the gate switch is closed.

[0022] After the gate switch is closed, any of the aforementioned gate trigger voltages is applied to the SCR under test. The signal from the anode of the SCR under test is acquired, processed, and displayed via LEDs and a buzzer to determine if the SCR is functioning correctly. See details... Figure 2 .

[0023] like Figure 2 The diagram shown illustrates the functionalities of testing the motherboard and the SCR under test.

[0024] The power supply generates three different voltages through three voltage regulation chips. These voltages are applied to the gate of the SCR under test via a selector switch, resulting in different responses from the SCR. These responses are then presented through audio-visual displays. The practical testing process is as follows: When the selector switch is in position T1, the voltage output from the first voltage regulator chip is applied to the gate of the SCR under test. The output voltage of this voltage regulator chip is preset to 1.8V or 0V, and can also be adjusted according to the specifications of the SCR under test. When the gate pass switch SB1 is pressed, the SCR is in an untriggered state. At this time, both the gate pass LED2 and the SCR pass LED1 in the display circuit are off, and the buzzer BUZZ1 does not sound. This indicates that the SCR under test is normally off in the untriggered state. Conversely, if the SCR pass LED1 is lit and the buzzer BUZZ1 sounds, it indicates that the SCR is short-circuited.

[0025] When the selector switch is in position T2, the voltage output from the second voltage regulator chip is applied to the gate of the SCR under test. The preset output voltage of this voltage regulator chip is 3V, but it can be adjusted according to the specifications of the SCR under test. When gate pass SB1 is pressed, the SCR is in the automatic test trigger state. At this time, both gate pass LED2 and SCR pass LED1 in the display circuit are lit, and the buzzer BUZZ1 sounds. This indicates that the SCR under test is conducting normally in the trigger state. Conversely, if SCR pass LED1 is not lit and the buzzer BUZZ1 does not sound, it indicates that the SCR is open-circuited. After the test, press SCR turn-off SB2 to return the SCR under test to the off state.

[0026] When the selector switch is in position T3, the voltage output from the third-channel voltage regulator chip is applied to the gate of the SCR under test. When the gate pass switch SB1 is pressed, the SCR is in the manual test trigger state. The output voltage of this channel's voltage regulator chip is adjusted using the adjustable knob until both the gate pass LED2 and SCR pass LED1 in the display circuit are lit, and the buzzer BUZZ1 sounds. Simultaneously, the voltage of the SCR when it is conducting can be observed on the display screen. This indicates that the SCR under test is conducting normally in the trigger state. Conversely, if the SCR pass LED1 is not lit and the buzzer BUZZ1 does not sound, it indicates that the SCR is open-circuited. After the test, press the SCR turn-off switch SB2 to return the SCR under test to the off state.

[0027] In this embodiment, the SCR tester is mounted in an integrated lightweight aluminum box, which facilitates heat dissipation of the internal components and adapts to the complexity of on-site maintenance environments. The aluminum box has dimensions of approximately 130 (length) * 90 (width) * 45 (height) cm, comparable in size to a typical multimeter, and its compact design makes it easy to carry and use. A simple user manual is included on the back of the tester for easy operation by on-site maintenance personnel.

[0028] The beneficial effects of this portable SCR tester are as follows: 1. Portable SCR testers, with their compact design and accurate test results, provide convenient and reliable services to industries such as thyristor manufacturing and electrical maintenance engineering. In the thyristor manufacturing industry, they can serve as a tool for preliminary quality selection of thyristors on the production line; in electrical maintenance engineering, portable SCR testers are invaluable assistants for engineers and technicians, enabling them to quickly determine the functionality of power devices on-site, meeting the needs of electrical maintenance projects, improving the efficiency of maintenance work, and enhancing the reliability of equipment after repair.

[0029] 2. Significantly reduces maintenance time for the electrical control system on field equipment, thereby reducing equipment downtime. The process of removing the SCR from the equipment, testing it in the workshop, and then reinstalling it is time-consuming, affecting equipment efficiency and wasting manpower.

[0030] 3. Significantly reduces the chance of human-caused damage to the SCR module. The process of removing the SCR from the equipment, testing it in the workshop, and then reinstalling it is fraught with the risk of SCR electrode deformation or damage, or electrostatic discharge. However, using a portable SCR tester to test the SCR directly on the equipment greatly reduces these risks.

[0031] 4. Improve the overall reliability of the electrical control system after testing and repair. The installation of any module within the electrical control system must strictly adhere to relevant process requirements, which is difficult for on-site maintenance personnel to achieve. Issues such as whether the heat dissipation layer behind the SCR module meets requirements also need to be addressed. If process requirements are not met, poor heat dissipation of the SCR module can lead to unstable equipment operation. However, by using a portable SCR tester for on-machine testing, only the damaged individual SCR modules need to be replaced, thus minimizing SCR module disassembly and significantly improving the operational reliability of the equipment after repair.

[0032] 5. The portable SCR tester features automatic testing capabilities and provides corresponding audible and visual alerts for test results. Its intelligent operation mode allows even on-site maintenance personnel unfamiliar with the SCR module to easily determine if it is functioning correctly.

[0033] 6. A brief instruction manual is attached to the back of the portable SCR tester for easy use by on-site maintenance personnel.

Claims

1. A portable SCR tester, comprising a portable housing and a rechargeable battery and a test motherboard disposed within the portable housing; characterized in that: The test motherboard is equipped with: A trigger signal generator that generates a trigger signal to trigger the SCR under test; A signal acquisition and processing module that acquires the output signal and trigger signal of the SCR under test and processes the acquired signals. The signal acquisition and processing module acquires the output signal of the SCR under test, processes the acquired output signal of the SCR under test to determine whether the SCR under test is normal, open circuit or short circuit; and displays the processing result of the SCR signal processing circuit.

2. The portable SCR tester according to claim 1, characterized in that: The trigger signal generator is mounted on the test motherboard and includes a non-triggered state test module that generates a non-triggered state test signal; a trigger automatic test module that generates a trigger automatic test signal; and a trigger manual test module that generates a trigger manual test signal. The outputs of the non-triggered state test module, the triggered automatic test module, and the triggered manual test module are respectively connected to the gate (G) of the SCR under test via a selection switch T.

3. The portable SCR tester according to claim 2, characterized in that: The untriggered state test module is the first regulated output module that generates a 1.8V or 0V voltage signal; The automatic test trigger module is a second voltage regulated output module that generates a 3V voltage signal. The trigger manual test module is a third voltage regulator module that allows manual adjustment to change the output voltage between 0V and 15V.

4. The portable SCR tester according to claim 3, characterized in that: The non-triggered state test module adjusts the output voltage according to the specifications of the SCR under test; The automatic test module adjusts the output voltage according to the specifications of the SCR under test; The manual test module is triggered by adjusting a knob to observe the SCR conduction status and trigger voltage value.

5. The portable SCR tester according to claim 3, characterized in that: When the trigger signal generated by the trigger signal generator is connected to the gate (G) terminal of the SCR under test, a gate switch SB1 is connected in series. When the positive terminal of the working power supply is connected to the A terminal of the SCR under test, an SCR-on LED1 and a buzzer BUZZ1 are also connected, and an SCR-off SB2 is connected in series. A gate switch LED2 is connected between the gate (G) terminal and the gate (K) terminal of the SCR under test. The anode of the LED2 is connected to the gate (K) terminal of the SCR under test, and the anode of the SCR-on LED1 is connected to the positive terminal of the working power supply.

6. The portable SCR tester according to any one of claims 1 to 5, characterized in that: The portable housing also includes a rechargeable lithium battery that provides DC power to the portable SCR tester.

7. The portable SCR tester according to claim 6, characterized in that: It is also equipped with a display screen that shows the voltage value of the trigger signal and an audible and visual alarm device that indicates the test results.

8. The portable SCR tester according to claim 7, characterized in that: The rechargeable battery power supply circuit is also equipped with a convenient on / off switch, and a corresponding adapter is provided for convenient charging.

9. The portable SCR tester according to claim 7, characterized in that: It also includes indicator lights to display test results and an audible alarm device.

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