Circuit and testboard for full-wave detection of silicon controlled rectifier output signal

Abstract

The utility model provides a silicon controlled rectifier output signal full-wave detection circuit and a testboard, which are applied to the technical field of silicon controlled rectifier testing, and the circuit comprises a silicon controlled rectifier output detection circuit which carries out the isolation conversion through an optical coupling isolator after the silicon controlled rectifier output signal in a tested controller is shaped through a rectifier bridge. The signal is amplified by the triode and then is input to the main control module; the test board comprises a base, a buffer plate and a pressing plate capable of moving up and down, the circuit for silicon controlled rectifier output signal full-wave detection is arranged in the base, the buffer plate is installed on the base, a containing groove for containing a tested controller is formed in the buffer plate, and the pressing plate presses the buffer plate downwards. And the detected controller is in contact with a circuit for full-wave detection of a silicon controlled rectifier output signal. The output signal of the tested controller is subjected to rectification, isolation conversion and amplification processing and then is judged through the main control module, and the output condition of the silicon controlled rectifier is judged through the waveform, so that the judgment accuracy is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of thyristor testing, and in particular relates to a circuit and a test bench for full-wave detection of thyristor output signals. Background Art

[0002] Silicon controlled rectifier (SCR) is a high-power electrical component, also known as thyristor. It has the advantages of small size, high efficiency and long life. In the automatic control system, it can be used as a high-power driver to achieve the purpose of controlling high-power equipment with low-power controls. It has been widely used in AC and DC motor speed control systems, power control systems and follow-up systems.

[0003] A controller with thyristor needs to detect whether the thyristor is conducting after power is turned on. Currently, most of them are indicated by a multimeter or a conduction indicator light. However, thyristor has bidirectional conductivity. When AC power is turned on, as long as one side is turned on, the multimeter or indicator light will measure that the thyristor is conducting normally. There is a disadvantage at this time. If a multimeter or indicator light is used for detection, a thyristor with single-side damage cannot be detected. Utility Model Content

[0004] In view of the above problems in the prior art, the purpose of the utility model is to provide a test bench for full-wave detection of thyristor output signals, which improves the accuracy of judgment by rectifying, isolating, converting and amplifying the output signal of the controller under test, and then judging it through the main control module, and judging the output condition of the thyristor through waveform data.

[0005] A test bench for full-wave detection of thyristor output signals comprises a thyristor output detection circuit connected to a main control module, wherein a plurality of thyristor output detection circuits are provided and connected to the output end of a corresponding controller under test through a wiring port, wherein the controller under test has a thyristor built therein, wherein the thyristor output detection circuit shapes the output signal of the thyristor in the controller under test through a rectifier bridge D1, and then performs isolation conversion through an optical coupler isolator IC1, and then amplifies the signal through a transistor Q1 and inputs it into the main control module, wherein the main control module makes a judgment based on the output waveform.

[0006] Preferably, the thyristor output detection circuit includes a rectifier bridge D1, an optocoupler isolator IC1 and a transistor Q1, wherein the output port 1 of the rectifier bridge D1 is connected to the cathode of the voltage-stabilizing diode DZ1, the output port 2 of the rectifier bridge D1 is connected to the anode of the voltage-stabilizing diode DZ1 through a resistor R2, and the two ends of the voltage-stabilizing diode DZ1 are respectively connected to the input ends of the optocoupler isolator IC1; the base of the transistor Q1 is connected to the power supply through a resistor R3, the collector is connected to the power supply through a resistor R4, and the emitter is grounded, a capacitor C1 is connected between the base and the emitter of the transistor Q1, and a resistor R5 and a capacitor C2 are connected in series between the collector and the emitter; the output end of the optocoupler isolator IC1 is connected to the two ends of the capacitor C1, and the circuit between the resistor R5 and the capacitor C2 outputs a signal to the main control module.

[0007] Preferably, the main control module is also connected to the buzzer circuit, the display circuit and the reserved key circuit, and the multiple keys in the reserved key circuit correspond one-to-one to the multiple thyristor output detection circuits.

[0008] Preferably, the output waveform of the thyristor output detection circuit includes a high level and a low level, and the main control module determines whether the output of the thyristor built into the controller under test is normal according to the number of high levels and low levels sampled within a set time.

[0009] Another object of the present application is to propose a test bench, including the above-mentioned circuit for full-wave detection of thyristor output signals, the test bench including a base, a buffer plate and a pressure plate that can be moved up and down, the circuit for full-wave detection of thyristor output signals is arranged inside the base, the buffer plate is installed on the base by a spring, and a placement groove for placing the controller under test is provided on the buffer plate. When the pressure plate presses the buffer plate downward, the controller under test contacts the circuit for full-wave detection of thyristor output signals.

[0010] Preferably, the base is connected to a side panel, the side panel is connected to a mounting seat, the mounting seat includes a connecting end and a fixing sleeve, the connecting end is hinged to the handle, the fixing sleeve is sleeved to the sliding rod, the handle is connected to the sliding rod through a connecting plate, and the other end of the sliding rod is connected to the pressure plate.

[0011] Preferably, an auxiliary plate is installed on the side plate, a guide rod is installed on the auxiliary plate, the other end of the guide rod is connected to the base, and the pressure plate is slidably connected to the guide rod.

[0012] The beneficial effect of the utility model is that the circuit and test bench for full-wave detection of thyristor output signals can improve the accuracy of judgment by rectifying, isolating, converting and amplifying the output signal of the controller under test, and then judging it through the main control module, and judging the output condition of the thyristor through the processed waveform data.

[0013] Through the structural coordination among the connecting end, the fixing sleeve, the sliding rod and the handle in the test bench, the pressure plate can be driven to move up and down when the handle is pulled, and the pressure plate can press the buffer plate to move toward the base when it moves downward, so that the circuit used for full-wave detection of the thyristor output signal in the base contacts the controller under test on the buffer plate, realizing electrical connection and achieving the purpose of rapid detection of the controller under test. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 It is a circuit block diagram of the utility model;

[0016] Figure 2 It is a circuit diagram of the thyristor output detection circuit of the utility model;

[0017] Figure 3 It is a structural schematic diagram of the test bench of the utility model;

[0018] Figure 4 The utility model is an input waveform and an output waveform diagram of a thyristor output detection circuit.

[0019] The markings in the figure are: 1. base; 2. buffer plate; 3. pressure plate; 4. side plate; 5. mounting seat; 501. connecting end; 502. fixing sleeve; 6. handle; 7. connecting plate; 8. sliding rod; 9. auxiliary plate; 10. guide rod. DETAILED DESCRIPTION

[0020] Embodiment 1

[0021] like Figure 1 As shown, a circuit for full-wave detection of thyristor output signals includes a thyristor output detection circuit connected to a main control module. The thyristor output detection circuit shapes the output signal of the thyristor in the tested controller through a rectifier bridge D1, and then isolates and converts it through an optocoupler isolator IC1, and then amplifies the signal through a transistor Q1 and inputs it to the main control module. The main control module makes a judgment based on the output waveform. In particular, the tested controller has a built-in thyristor.

[0022] For details, please refer to Figure 2 The thyristor output detection circuit includes a rectifier bridge D1, an optocoupler isolator IC1 and a transistor Q1. The output port 1 of the rectifier bridge D1 is connected to the cathode of the voltage-stabilizing diode DZ1. The output port 2 of the rectifier bridge D1 is connected to the anode of the voltage-stabilizing diode DZ1 through a resistor R2. The two ends of the voltage-stabilizing diode DZ1 are respectively connected to the input ends of the optocoupler isolator IC1.

[0023] The base of the transistor Q1 is connected to the power supply through the resistor R3, the collector is connected to the power supply through the resistor R4, and the emitter is grounded. A capacitor C1 is connected between the base and emitter of the transistor Q1, and a resistor R5 and a capacitor C2 are connected in series between the collector and the emitter.

[0024] The output end of the optical coupler isolator IC1 is connected to the two ends of the capacitor C1, and the circuit between the resistor R5 and the capacitor C2 outputs a signal to the main control module.

[0025] In addition, the output waveform of the thyristor output detection circuit includes high level and low level. The main control module determines whether the output of the thyristor built into the controller under test is normal based on the number of high level and low level sampled within the set time.

[0026] Specifically, after the thyristor is connected to 220V AC, it outputs a strong electric signal, which is rectified and isolated by the thyristor output detection circuit and then output as a weak signal. The output waveform includes a low level of 1.1ms and a high level of 8.9ms, with 10ms as a cycle, and the output is cyclically executed.

[0027] In this embodiment, the main control device is an MCU. According to the waveform characteristics of the thyristor output signal, the sampling period of the MCU is set to 1ms. When the MCU detects a high level for 8ms continuously, it starts continuous detection for 1s.

[0028] When the thyristor is turned on for 1s, theoretically there should be 110ms of low-level and 890ms of high-level signals. The above-mentioned MCU sampling period is set to 1ms, and theoretically 100-200 low-level signals and 800-900 high-level signals can be sampled. Therefore, if the MCU detects 90% of the theoretical minimum number of low-level signals and 90% of the theoretical minimum number of high-level signals within 1s, the thyristor is considered to be turned on normally, otherwise it is considered that the thyristor is not turned on.

[0029] like Figure 4 As shown, the waveform at the top is Figure 2 The input signal of the circuit in the middle, the waveform at the bottom is Figure 2 The output signal of the circuit can be used to determine whether the thyristor to be tested is normal by detecting the number of high and low levels in the output signal.

[0030] In addition, if Figure 1As shown, there are multiple thyristor output detection circuits, which are connected to the output end of the corresponding controller under test through the wiring port. The main control module is also connected to the buzzer circuit, the display circuit and the reserved key circuit. The multiple keys in the reserved key circuit correspond to the multiple thyristor output detection circuits one by one. When the thyristor conduction abnormality is detected, the buzzer circuit alarms, the display circuit is used to display the power-on of the circuit, and the reserved key circuit is used to select the thyristor output detection circuit corresponding to the controller under test.

[0031] Embodiment 2

[0032] like Figure 3 As shown, the utility model proposes a test bench, including a circuit for full-wave detection of thyristor output signals as described in Example 1, the test bench includes a base 1, a buffer plate 2 and a pressure plate 3 that can move up and down, and the circuit for full-wave detection of thyristor output signals is configured inside the base 1.

[0033] The buffer plate 2 is installed on the base 1 through a spring. A placement groove for placing the controller under test is provided on the buffer plate 2. Due to the elastic effect of the spring, when the pressure plate 3 presses the buffer plate 2 downward, the controller under test contacts the circuit for full-wave detection of the thyristor output signal. Specifically, the wiring port of the circuit for full-wave detection of the thyristor output signal is connected to the output end of the controller under test.

[0034] Specifically, Figure 3 As shown, the base 1 is connected to a side plate 4, the side plate 4 is connected to a mounting seat 5, the mounting seat 5 includes a connecting end 501 and a fixing sleeve 502, the connecting end 501 is hinged to the handle 6, the fixing sleeve 502 is sleeved to the slide rod 8, the handle 6 and the slide rod 8 are connected through a connecting piece 7, and the other end of the slide rod 8 is connected to the pressing plate 3. Through the structural design between the connecting end 501, the fixing sleeve 502, the handle 6 and the slide rod 8, when the handle 6 is pulled, the slide rod 8 can move up and down along the fixing sleeve 502, thereby driving the pressing plate 3 to move up and down.

[0035] In addition, an auxiliary plate 9 is mounted on the side plate 4, a guide rod 10 is mounted on the auxiliary plate 9, the other end of the guide rod 10 is connected to the base 1, and the pressing plate 3 is slidably connected to the guide rod 10. The pressing plate 3 moves up and down along the guide rod 10, which can improve the stability of the movement of the pressing plate 3.

[0036] Working principle: When using the test bench for full-wave detection of thyristor output signals, the circuit board of the controller under test is placed in the placement groove on the buffer plate 2, and then the handle 6 is pulled downward, and the pressing plate 3 is driven to move downward by the sliding rod 8 until the buffer plate 2 is pressed downward. Due to the elastic effect of the spring, the buffer plate 2 can be pressed toward the base 1 to connect the circuit board of the controller under test with the circuit for full-wave detection of thyristor output signals built into the base 1.

[0037] After power is turned on, the output signal of the controller under test is shaped, isolated, converted and amplified by the thyristor output detection circuit and then enters the main control module. The main control module determines whether the signal waveform is within the normal range. If the signal waveform is within the normal range, it indicates that the thyristor output signal is normal. If it is not within the normal range, it indicates that the thyristor output signal is abnormal, and the buzzer circuit sounds an alarm.

[0038] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A circuit for full-wave detection of thyristor output signal, characterized in that: It includes a thyristor output detection circuit connected to the main control module. There are multiple thyristor output detection circuits, which are connected to the output end of the corresponding controller under test through a wiring port. The controller under test has a built-in thyristor. The thyristor output detection circuit shapes the output signal of the thyristor in the controller under test through a rectifier bridge D1, and then isolates and converts it through an optical coupler isolator IC1, and then amplifies the signal through a transistor Q1 and inputs it to the main control module. The main control module makes a judgment based on the output waveform.

2. The circuit for full-wave detection of thyristor output signal according to claim 1, characterized in that: The thyristor output detection circuit includes a rectifier bridge D1, an optocoupler isolator IC1 and a transistor Q1, wherein the output port 1 of the rectifier bridge D1 is connected to the cathode of the voltage-stabilizing diode DZ1, the output port 2 of the rectifier bridge D1 is connected to the anode of the voltage-stabilizing diode DZ1 through a resistor R2, and the two ends of the voltage-stabilizing diode DZ1 are respectively connected to the input ends of the optocoupler isolator IC1; The base of the transistor Q1 is connected to the power supply through a resistor R3, the collector is connected to the power supply through a resistor R4, the emitter is grounded, a capacitor C1 is connected between the base and the emitter of the transistor Q1, and a resistor R5 and a capacitor C2 are connected in series between the collector and the emitter; The output end of the optical coupler isolator IC1 is connected to the two ends of the capacitor C1, and the circuit between the resistor R5 and the capacitor C2 outputs a signal to the main control module.

3. The circuit for full-wave detection of thyristor output signal according to claim 1, characterized in that: The main control module is also connected to a buzzer circuit, a display circuit and a reserved key circuit, and a plurality of keys in the reserved key circuit correspond one to one with a plurality of thyristor output detection circuits.

4. The circuit for full-wave detection of thyristor output signal according to claim 1, characterized in that: The output waveform of the thyristor output detection circuit includes a high level and a low level. The main control module determines whether the output of the thyristor built into the controller under test is normal according to the number of high levels and low levels sampled within a set time.

5. A test bench, characterized in that: The invention comprises a circuit for full-wave detection of thyristor output signals as claimed in any one of claims 1 to 4, wherein the test bench comprises a base (1), a buffer plate (2) and a pressure plate (3) movable up and down, wherein the circuit for full-wave detection of thyristor output signals is arranged inside the base (1), the buffer plate (2) is mounted on the base (1) by a spring, and a placement groove for placing a controller under test is provided on the buffer plate (2), and when the pressure plate (3) presses the buffer plate (2) downward, the controller under test contacts the circuit for full-wave detection of thyristor output signals.

6. The test bench according to claim 5, characterized in that: The base (1) is connected to a side plate (4), the side plate (4) is connected to a mounting seat (5), the mounting seat (5) comprises a connecting end (501) and a fixing sleeve (502), the connecting end (501) is hinged to the handle (6), the fixing sleeve (502) is sleeved to the sliding rod (8), the handle (6) and the sliding rod (8) are connected via a connecting piece (7), and the other end of the sliding rod (8) is connected to the pressing plate (3).

7. The test bench according to claim 6, characterized in that: An auxiliary plate (9) is installed on the side plate (4), a guide rod (10) is installed on the auxiliary plate (9), the other end of the guide rod (10) is connected to the base (1), and the pressure plate (3) is slidably connected to the guide rod (10).

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