Device for detecting performance of silicon controlled rectifier

Abstract

The utility model provides a device for detecting silicon controlled rectifier performance, which relates to the technical field of silicon controlled rectifier performance detection and comprises a transformer, a rectifying circuit, a three-terminal adjustable voltage stabilizer, an adjustable resistor R1, a fixed-value resistor R2, a self-locking button switch S1, an ampere meter, a voltmeter and a trigger power supply. According to the utility model, the quality of the silicon controlled rectifier can be directly and accurately tested on line, the process of assembling and disassembling elements is avoided, and the workload is reduced to a great extent; a large amount of time and labor cost are saved; detection of unidirectional silicon controlled rectifiers of different packaging types and current levels can be met, operation is relatively simple, and the device can be used quickly; and the structure is simple, manufacturing is easy, and manufacturing cost is low.

Description

Technical Field

[0001] This utility model relates to the field of thyristor performance testing technology, specifically to a device for testing the performance of thyristors. Background Technology

[0002] Currently, when checking the condition of thyristors (SCRs) in electrical drive control devices, it is necessary to disconnect the SCR's connecting busbar and break the main circuit for measurement. This method requires a significant amount of manual labor for disassembly and reassembly. Furthermore, conventional methods using general-purpose electrician's tools like multimeters can only determine if the SCR is damaged by measuring its resistance when it is on and off. They cannot test the SCR's conduction capability, voltage drop, or other performance characteristics, thus failing to assess its control performance. Utility Model Content

[0003] The purpose of this invention is to provide a device for testing the performance of a silicon controlled rectifier (SCR), which solves the problems of existing methods requiring a lot of manual labor and being unable to judge the control performance of the SCR. This device can accurately test the quality of the SCR, greatly reducing the workload, and can detect the control performance of the SCR.

[0004] To achieve the above objectives, this utility model provides a device for detecting the performance of a silicon controlled rectifier (SCR), comprising a transformer, a rectifier circuit, a three-terminal adjustable voltage regulator, an adjustable resistor R1, a fixed resistor R2, a self-locking push-button switch S1, an ammeter, a voltmeter, and a trigger power supply.

[0005] The output terminal of the transformer is connected to the input terminal of the rectifier circuit. The first output terminal of the rectifier circuit is connected to the first terminal of the three-terminal adjustable voltage regulator. The second terminal of the three-terminal adjustable voltage regulator is connected to the first terminal of the self-locking push-button switch S1 and the first terminal of the fixed resistor R2. The second terminal of the fixed resistor R2, the first terminal of the adjustable resistor R1, and the adjustment terminal of the adjustable resistor R1 are connected to the third terminal of the three-terminal adjustable voltage regulator. The second terminal of the adjustable resistor R1 is connected to the second output terminal of the rectifier circuit. The second terminal of the self-locking push-button switch S1 is connected to the first terminal of the thyristor under test via an ammeter. The second terminal of the thyristor under test is connected to the second output terminal of the rectifier circuit. A voltmeter is connected between the first and second terminals of the thyristor under test. A trigger power supply is connected between the second terminal and the trigger terminal of the thyristor under test.

[0006] According to the present invention, a device for detecting the performance of a silicon controlled rectifier (SCR) is provided, wherein the rectifier circuit is a rectifier bridge, and the rectifier bridge includes four diodes D1, D2, D3, and D4.

[0007] According to the present invention, a device for testing the performance of a thyristor includes a trigger power supply comprising a self-resetting push button switch S2, a selection switch S3, a first voltage source, and a second voltage source. The first end of the self-resetting push button switch S2 is connected to the trigger electrode of the thyristor under test, and the second end of the self-resetting push button switch S2 is connected to the first end of the first voltage source and the first end of the second voltage source. The fixed end of the selection switch S3 is connected to the second electrode of the thyristor under test, the first selection end of the selection switch S3 is connected to the second end of the first voltage source, and the second selection end of the selection switch S3 is connected to the second end of the second voltage source.

[0008] According to the present invention, a device for detecting the performance of a silicon controlled rectifier (SCR) is provided, wherein the first voltage source uses a single dry cell battery, and the second voltage source uses two dry cell batteries connected in series.

[0009] According to the device for detecting the performance of a silicon controlled rectifier (SCR) provided by this utility model, a filter capacitor C1 and a filter capacitor C2 are connected between the first output terminal and the second output terminal of the rectifier circuit.

[0010] According to the present invention, a device for detecting the performance of a silicon controlled rectifier (SCR) is provided, and the model of the three-terminal adjustable voltage regulator is LM317AH.

[0011] According to the present invention, a device for detecting the performance of a silicon controlled rectifier (SCR) is provided, wherein a capacitor C3 is connected between the first and second ends of an adjustable resistor R1, and a capacitor C4 is connected between the second end of a three-terminal adjustable voltage regulator and the second end of the adjustable resistor R1.

[0012] According to the present invention, a device for detecting the performance of a silicon controlled rectifier (SCR) is provided, wherein the second terminal of a three-terminal adjustable voltage regulator is connected to the first terminal of a self-locking push-button switch S1 via a fuse.

[0013] According to the present invention, a device for detecting the performance of a silicon controlled rectifier (SCR) is provided, wherein a current-limiting resistor R3 and an output indicator light are connected in series between the first end of a self-locking push-button switch S1 and the second end of an adjustable resistor R1.

[0014] According to the present invention, a device for testing the performance of a silicon controlled rectifier (SCR) is provided, wherein a light bulb is connected between the second electrode of the SCR under test and the second output terminal of the rectifier circuit.

[0015] The technical solution of this utility model has at least the following technical effects:

[0016] This invention provides a device for testing the performance of a silicon controlled rectifier (SCR), comprising a transformer, a rectifier circuit, a three-terminal adjustable voltage regulator, an adjustable resistor R1, a fixed resistor R2, a self-locking push-button switch S1, an ammeter, a voltmeter, and a trigger power supply. This invention can directly and accurately test the quality of SCRs online, eliminating the need for component disassembly and assembly, thus significantly reducing workload; saving considerable time and labor costs; meeting the testing requirements of unidirectional SCRs of different package types and current ratings; relatively simple operation, allowing for quick learning and use; and featuring a simple structure, ease of fabrication, and low cost. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] In the attached diagram:

[0019] Figure 1 This is a circuit diagram of the device for detecting the performance of a silicon controlled rectifier (SCR) according to this invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] The following description, in conjunction with the accompanying drawings, details some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0022] Please see Figure 1 This utility model provides a device for detecting the performance of a silicon controlled rectifier (SCR), including a transformer, a rectifier circuit, a three-terminal adjustable voltage regulator, an adjustable resistor R1, a fixed resistor R2, a self-locking push-button switch S1, an ammeter, a voltmeter, and a trigger power supply.

[0023] The output terminal of the transformer is connected to the input terminal of the rectifier circuit. The first output terminal of the rectifier circuit is connected to the first terminal of the three-terminal adjustable voltage regulator. The second terminal of the three-terminal adjustable voltage regulator is connected to the first terminal of the self-locking push-button switch S1 and the first terminal of the fixed resistor R2. The second terminal of the fixed resistor R2, the first terminal of the adjustable resistor R1, and the adjustment terminal of the adjustable resistor R1 are connected to the third terminal of the three-terminal adjustable voltage regulator. The second terminal of the adjustable resistor R1 is connected to the second output terminal of the rectifier circuit. The second terminal of the self-locking push-button switch S1 is connected to the first terminal of the thyristor under test via an ammeter. The second terminal of the thyristor under test is connected to the second output terminal of the rectifier circuit. A voltmeter is connected between the first and second terminals of the thyristor under test. A trigger power supply is connected between the second terminal and the trigger terminal of the thyristor under test.

[0024] Specifically, the trigger power supply includes a self-resetting push button switch S2, a selection switch S3, a first voltage source, and a second voltage source. The first terminal of the self-resetting push button switch S2 is connected to the trigger electrode of the thyristor under test. The second terminal of the self-resetting push button switch S2 is connected to the first terminal of the first voltage source and the first terminal of the second voltage source. The fixed terminal of the selection switch S3 is connected to the second electrode of the thyristor under test. The first selection terminal of the selection switch S3 is connected to the second terminal of the first voltage source, and the second selection terminal of the selection switch S3 is connected to the second terminal of the second voltage source.

[0025] The overall circuit structure of this utility model can be divided into the following parts:

[0026] Power supply section

[0027] V1 (AC power supply): Provides a 220Vrms (Root Mean Square) 50Hz AC voltage, which serves as the initial power input for the circuit and provides the basis for subsequent transformation, rectification and other operations.

[0028] T1 (Transformer, Model 220V / 12V 20W): Reduces 220V AC voltage to 24V, converting high voltage to a low voltage suitable for subsequent circuit processing, and reducing voltage to ensure the safe and stable operation of subsequent circuits.

[0029] Rectifier and filter section

[0030] The rectifier circuit can be a rectifier bridge, which includes four diodes D1, D2, D3, and D4 (diodes, model 1N5404 3A 400V) to convert the AC voltage stepped down by the transformer into DC voltage. Utilizing the unidirectional conductivity of the diodes, they conduct during the positive and negative half-cycles of the AC voltage, resulting in a unidirectional pulsating DC voltage output.

[0031] A filter capacitor C1 (2400uf 50V) and a filter capacitor C2 (1uf 50V) are connected between the first and second output terminals of the rectifier circuit. After filtering by the filter capacitors C1 and C2, the output DC voltage is 28.8V and the ripple voltage is 0.5V.

[0032] Regulated output section

[0033] The three-terminal adjustable voltage regulator can be model LM317AH, where the voltage V between the Vout terminal (i.e., the second terminal) and the ADJ terminal (i.e., the third adjustment terminal) is V. REF The voltage remains essentially constant at 1.25V. The output voltage Vout can be changed by adjusting the voltage at the ADJ terminal, where Vout = V... REF (1+R2 / R1)+I ADJ R1, due to the output current I at the ADJ terminal ADJ The voltage is very small and usually negligible. Therefore, when the adjustable resistor R1 is at its maximum value of 1kΩ and the fixed resistor R2 is 51Ω, the output voltage Vout = 1.25 × (1 + 1000 / 51) ≈ 25.76V. By supplying 28.8VDC to the LM317AH and adjusting the adjustable resistor R1, the output voltage of the LM317AH can be adjusted from 1.5V to 25.76V, with a maximum operating current of 1.5A and a fuse F1 with a fusing current of 1A.

[0034] A capacitor C3 is connected between the first and second terminals of the adjustable resistor R1. A capacitor C4 is connected between the second terminal of the three-terminal adjustable voltage regulator and the second terminal of the adjustable resistor R1. The capacitors C3 (1μF 50V) and C4 (1μF 50V) serve to further filter and stabilize the voltage, filtering out high-frequency noise in the voltage.

[0035] The second terminal of the three-terminal adjustable voltage regulator is connected to the first terminal of the self-locking push-button switch S1 via fuse F1. Fuse F1 (current limit 1A) provides overcurrent protection in the circuit.

[0036] A current-limiting resistor R3 (with a resistance of 1 kΩ) and an output indicator LED1 are connected in series between the first terminal of the self-locking push-button switch S1 and the second terminal of the adjustable resistor R1. The output indicator LED1 is a light-emitting diode and serves as the output indicator of the three-terminal adjustable voltage regulator.

[0037] Test section

[0038] When the self-locking push-button switch S1 is turned on, a positive voltage is applied across the silicon controlled rectifier (SCR) under test.

[0039] When the self-reset push-button switch S2 is pressed, a trigger voltage is applied to the thyristor under test.

[0040] The first voltage source V2 and the second voltage source V3 use batteries with voltages of 1.5V and 3V respectively, such as one dry cell battery and two dry cell batteries connected in series, as the power supply for the thyristor trigger circuit.

[0041] Selector switch S3 can switch between different trigger voltages of 1.5V or 3V.

[0042] A light bulb X1 (24V 15W) is connected between the second terminal of the thyristor under test and the second output terminal of the rectifier circuit. It is connected in series with the thyristor under test to indicate whether the thyristor under test is conducting and to provide a sustaining current.

[0043] The ammeter U2 (DC 0-5A) is used to display the current in the test circuit.

[0044] The voltmeter U3 (DC 0-35V) is used to display the positive voltage applied across the thyristor under test. After the thyristor under test is triggered, it displays the voltage drop after the thyristor under test is turned on.

[0045] It should be noted that this utility model device can be used on 2032 and 1450 hot rolling lines in steelmaking. Furthermore, it enables online detection of the core power electronic components of electrical drive control devices, specifically the thyristor (SCR), and can connect to unidirectional thyristors of various packages and current ratings. The condition of the thyristor can be determined by observing the illumination of indicator lights. Simultaneously, by observing the thyristor voltage drop displayed on the voltmeter, the operating performance parameters of the thyristor can be monitored.

[0046] The method of using this utility model is as follows:

[0047] 1. Understand the parameters of the thyristor under test, such as reverse repetitive peak voltage, rated on-state current, sustaining current, and trigger voltage.

[0048] 2. Select a load (indicator light) with appropriate power and install it into the X1 interface (the operating current of the indicator light should be greater than the holding current of the thyristor under test, but less than the rated on-state current).

[0049] 3. Connect the device to 220V AC power; indicator LED1 will light up. Connect the thyristor to be tested.

[0050] 4. Turn on the self-locking push-button switch S1 to apply the anode voltage to the thyristor under test. At this time, the voltmeter will display the voltage value. Adjust the voltage to be less than the reverse repetitive peak voltage through the adjustable resistor R1. If the indicator light is on, it means that the thyristor under test has broken down and short-circuited.

[0051] 5. After selecting the appropriate trigger voltage by selecting switch S3, press the self-reset button switch S2. At this time, the thyristor under test will be triggered and conduct, the bulb X1 will light up, and the ammeter will display the load circuit current. This indicates that the thyristor can be triggered normally and maintain conduction. Otherwise, it indicates that the thyristor is open or the trigger electrode is open.

[0052] 6. Voltmeter U3 measures the voltage drop of the thyristor under test. This parameter reflects its power consumption to some extent. A lower forward voltage drop means less power loss in the on-state, which is an important aspect of thyristor performance. A lower voltage drop reduces heat generation and improves efficiency. Furthermore, the stability of the forward voltage drop is also related to performance. If the forward voltage drop remains relatively stable under different operating conditions (such as different currents and temperatures), it indicates that the thyristor is reliable, enabling more stable circuit operation and significantly impacting circuit safety, lifespan, and many other performance aspects.

[0053] In summary, the device for detecting the performance of a silicon controlled rectifier (SCR) provided by this invention has the following advantages:

[0054] 1. Simple structure, easy to manufacture, and low cost.

[0055] 2. It allows for direct and accurate online testing of thyristors, eliminating the need for component disassembly and reassembly, thus significantly reducing workload and saving considerable time and labor costs. It also avoids potential damage to equipment caused by disassembly and reinstallation, such as loose wiring or component damage. This is especially important for complex electronic devices or industrial control systems, where disassembling thyristors could compromise system stability and integrity.

[0056] 3. It can meet the detection requirements of unidirectional thyristors with different packaging types and current levels. The operation is relatively simple and can be quickly mastered.

[0057] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. It should be understood that the present invention is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A device for detecting the performance of a silicon controlled rectifier (SCR), characterized in that, Includes a transformer, rectifier circuit, three-terminal adjustable voltage regulator, adjustable resistor R1, fixed resistor R2, self-locking push-button switch S1, ammeter, voltmeter and trigger power supply; The output terminal of the transformer is connected to the input terminal of the rectifier circuit. The first output terminal of the rectifier circuit is connected to the first terminal of the three-terminal adjustable voltage regulator. The second terminal of the three-terminal adjustable voltage regulator is connected to the first terminal of the self-locking push-button switch S1 and the first terminal of the fixed resistor R2. The second terminal of the fixed resistor R2, the first terminal of the adjustable resistor R1, and the adjustment terminal of the adjustable resistor R1 are connected to the third terminal of the three-terminal adjustable voltage regulator. The second terminal of the adjustable resistor R1 is connected to the second output terminal of the rectifier circuit. The second terminal of the self-locking push-button switch S1 is connected to the first terminal of the thyristor under test via an ammeter. The second terminal of the thyristor under test is connected to the second output terminal of the rectifier circuit. A voltmeter is connected between the first and second terminals of the thyristor under test. A trigger power supply is connected between the second terminal and the trigger terminal of the thyristor under test.

2. The device for testing the performance of thyristors according to claim 1, characterized in that, The rectifier circuit is a rectifier bridge, which includes four diodes D1, D2, D3, and D4.

3. The device for testing the performance of thyristors according to claim 1, characterized in that, The trigger power supply includes a self-resetting push button switch S2, a selection switch S3, a first voltage source, and a second voltage source. The first terminal of the self-resetting push button switch S2 is connected to the trigger electrode of the thyristor under test. The second terminal of the self-resetting push button switch S2 is connected to the first terminal of the first voltage source and the first terminal of the second voltage source. The fixed terminal of the selection switch S3 is connected to the second electrode of the thyristor under test. The first selection terminal of the selection switch S3 is connected to the second terminal of the first voltage source, and the second selection terminal of the selection switch S3 is connected to the second terminal of the second voltage source.

4. The device for testing the performance of thyristors according to claim 3, characterized in that, The first voltage source uses a single dry cell battery, and the second voltage source uses two dry cell batteries connected in series.

5. The apparatus for detecting the performance of a silicon controlled rectifier (SCR) according to claim 1, characterized in that, A filter capacitor C1 and a filter capacitor C2 are connected between the first output terminal and the second output terminal of the rectifier circuit.

6. The device for testing the performance of triacs according to claim 1, characterized in that, The model of the three-terminal adjustable voltage regulator is LM317AH.

7. The device for testing the performance of triacs according to claim 1, characterized in that, A capacitor C3 is connected between the first and second ends of the adjustable resistor R1, and a capacitor C4 is connected between the second end of the three-terminal adjustable voltage regulator and the second end of the adjustable resistor R1.

8. The device for testing the performance of triacs according to claim 1, characterized in that, The second terminal of the three-terminal adjustable voltage regulator is connected to the first terminal of the self-locking push-button switch S1 via a fuse.

9. The device for testing the performance of triacs according to claim 1, characterized in that, A current-limiting resistor R3 and an output indicator light are connected in series between the first end of the self-locking push button switch S1 and the second end of the adjustable resistor R1.

10. The apparatus for detecting the performance of a silicon controlled rectifier (SCR) according to claim 1, characterized in that, A light bulb is connected between the second electrode of the thyristor under test and the second output terminal of the rectifier circuit.

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