Detection circuit of thyristor module

Abstract

The utility model discloses a detection circuit of a thyristor module, which relates to the field of detection circuits and comprises a trigger signal detection unit connected to a control electrode of the thyristor module and a voltage acquisition unit connected to two ends of the thyristor module, and the voltage acquisition unit is connected with a processing unit. The trigger signal of the thyristor module is collected and detected through the trigger signal detection unit. And the voltage acquisition unit acquires the voltage at the two ends of the thyristor module, amplifies and raises the acquired voltage, and compares the acquired voltage with the two threshold voltages of the processing unit, thereby detecting whether the thyristor module has a fault or not. Meanwhile, the condition of the detection circuit is intuitively reflected through the plurality of light-emitting diodes, so that people can judge whether the thyristor module has a fault by observing the lightening condition of the light-emitting diodes, the detection result is reliable, and the cost is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of detection circuit, concretely is a detection circuit of thyristor module. BACKGROUND

[0002] Bidirectional thyristor, also known as TRIAC, is a controllable silicon device that can conduct in both directions. It combines the characteristics of bidirectional conduction and the controllability of thyristor, enabling bidirectional control and bidirectional conduction. Whether it is a short circuit fault or an open circuit fault, it will affect the normal operation of the thyristor module, which may cause current abnormalities, voltage fluctuations, equipment damage, and even safety accidents. Therefore, to ensure the stable operation of the power system and the safety of the equipment, it is very important to detect and handle the faults of the thyristor module, and it is necessary to design a detection circuit that can be assembled on an AC power supply cabinet and can determine whether the thyristor module has a fault by observation. SUMMARY

[0003] The utility model aims at providing a detection circuit of thyristor module, which aims at overcoming the above problems existing in the prior art.

[0004] To achieve the above purpose, the utility model provides the following technical scheme:

[0005] A detection circuit of a thyristor module, comprising a detected thyristor module, a trigger signal detection unit, a voltage acquisition unit and a processing unit;

[0006] The control electrode of the above-mentioned thyristor module is connected with the trigger signal detection unit;

[0007] The voltage acquisition unit comprises a proportional amplifier U1A, a resistor R16 and a capacitor C5; the resistor R16 and the capacitor C5 are connected in parallel between the positive input terminal and the output terminal of the proportional amplifier U1A;

[0008] The processing unit comprises a comparator U2A, a first threshold voltage module, a comparator U2B, a second threshold voltage module, a light emitting diode LED3 and a light emitting diode LED4; the positive input terminal of the comparator U2A is connected with the first threshold voltage module, and the output terminal is connected to the positive electrode of the light emitting diode LED3; at the same time, the positive electrode of the light emitting diode LED3 is connected to the DC power supply through the resistor R5, and the negative electrode is grounded through the resistor R6; the negative input terminal of the comparator U2B is connected with the second threshold voltage module, and the output terminal is connected to the positive electrode of the light emitting diode LED4; at the same time, the positive electrode of the light emitting diode LED4 is connected to the DC power supply through the resistor R15, and the negative electrode is grounded through the resistor R18;

[0009] And, the input end VIN of the above thyristor module is connected to the positive input end of the proportional amplifier U1A after voltage division, and the output end VOUTT is connected to the negative input end of the proportional amplifier U1A after voltage division; the output end of the proportional amplifier U1A is connected to the negative input end of the comparator U2A and the positive input end of the comparator U2B.

[0010] Further, the voltage acquisition unit further comprises a capacitor C4, a resistor R8 and a DC power supply AV; the capacitor C4 and the resistor R8 are connected in parallel, one end of which is connected to the DC power supply AV, and the other end is connected to the negative input end of the proportional amplifier U1A.

[0011] Further, the trigger signal detection unit comprises a resistor R1, a light emitting diode LED1, a resistor R4 and a light emitting diode LED2; in the thyristor module, the control electrode of the reverse thyristor D1 is connected to the positive electrode of the light emitting diode LED1 through the resistor R1, and the negative electrode of the light emitting diode LED1 is grounded; the control electrode of the forward thyristor D2 is connected to the positive electrode of the light emitting diode LED2 through the resistor R4, and the negative electrode of the light emitting diode LED2 is grounded.

[0012] Further, the first threshold voltage module comprises a resistor R2, a resistor R3 and a capacitor C3; the resistor R2 and the resistor R3 are connected in series, one end of which is connected to a DC power supply, and the other end is grounded; the capacitor C3 is connected in parallel to the resistor R3, and the connection point of the resistor R2 and the resistor R3 is connected to the positive input end of the comparator U2A.

[0013] Further, the second threshold voltage module comprises a resistor R19, a resistor R20 and a capacitor C6; the resistor R19 and the resistor R20 are connected in series, one end of which is connected to a DC power supply, and the other end is grounded; the capacitor C6 is connected in parallel to the resistor R20, and the connection node between the resistor R19 and the resistor R20 is connected to the negative input end of the comparator U2B.

[0014] Further, it further comprises a resistor R7 and a resistor R17; the output end of the proportional amplifier U1A is connected to the negative input end of the comparator U2A through the resistor R7, and is connected to the positive input end of the comparator U2B through the resistor R17.

[0015] Compared with the prior art, the utility model has the advantages that:

[0016] The utility model discloses a trigger signal detection unit connected to the control electrode of thyristor module and voltage acquisition unit connected to the both ends of thyristor module, and voltage acquisition unit is connected with processing unit. Its through trigger signal detection unit first to the trigger signal of thyristor module carries out the collection detection. Again through voltage acquisition unit gathers the voltage of the both ends of thyristor module, amplifies and lifts the collection voltage, compares it with the two threshold voltage of processing unit again, thereby detects whether the fault exists to thyristor module. Meanwhile, through the intuitive reflection of multiple light emitting diode of detection circuit's situation, makes people can judge whether the fault exists to thyristor module through the lighting condition of these light emitting diode, and the detection result is reliable and low in cost. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the circuit structure diagram of the utility model.

[0018] Figure 2 It is the circuit structure diagram of the utility model, and the trigger signal detection unit of thyristor module.

[0019] Figure 3 It is the circuit structure diagram of the utility model, and the voltage acquisition unit.

[0020] Figure 4 It is the circuit structure diagram of the utility model, and the processing unit.

[0021] Figure 5 It is the flow chart of whether the fault exists to the utility model of the utility model of personnel using the utility model detection thyristor module.

[0022] Figure 6 It is the voltage change simple schematic diagram of lifting before and after. DETAILED DESCRIPTION

[0023] The specific embodiment of the utility model is explained below with reference to the drawings. In order to understand the utility model comprehensively, many details are described below, but the utility model can be realized without these details for those skilled in the art.

[0024] As Figure 1 Shown, a kind of detection circuit of thyristor module, including the thyristor module 1 of being detected, trigger signal detection unit 2, voltage acquisition unit 3 and processing unit 4.

[0025] As Figure 2 Shown, thyristor module 1 is formed by two thyristors in parallel, and the orientation direction of two thyristors. Two thyristors are reverse thyristor D1 and positive direction thyristor D2 respectively, and one end after parallel connection is input terminal VIN, and the other end is output terminal VOUT. In addition, reverse thyristor D1 and positive direction thyristor D2 all have control electrode, for receiving trigger signal, to switch the on-off state of thyristor.

[0026] As shown in Figure 2 , the trigger signal detection unit 2 includes a resistor R1, a light emitting diode LED1, a resistor R4 and a light emitting diode LED2; one end of the resistor R1 is connected to the positive electrode of the light emitting diode LED1, and the negative electrode of the light emitting diode LED1 is grounded, thereby serving as a circuit for detecting the trigger signal. One end of the resistor R4 is connected to the positive electrode of the light emitting diode LED2, and the negative electrode of the light emitting diode LED2 is grounded, thereby serving as another circuit for detecting the trigger signal.

[0027] As shown in Figure 3 , the voltage acquisition unit 3 includes a proportional amplifier U1A, a resistor R16 and a capacitor C5. The resistor R16 and the capacitor C5 are connected in parallel between the positive input terminal and the output terminal of the proportional amplifier U1A. The output terminal of the proportional amplifier U1A is fed back to the positive input terminal through the resistor R16 and the capacitor C5, so as to control the gain and stability of the proportional amplifier U1A and the like.

[0028] As preferred, the voltage acquisition unit 3 further includes a capacitor C4, a resistor R8 and a direct current power supply AV; the capacitor C4 and the resistor R8 are connected in parallel, one end of which is connected to the direct current power supply AV, and the other end of which is connected to the negative input terminal of the proportional amplifier U1A. By means of the capacitor C4, the resistor R8 and the direct current power supply AV, a direct current voltage is added to the proportional amplifier, so as to lift the negative half wave of the voltage difference between the input voltage VIN and the output voltage VOUT to positive after the voltage drop (as shown in Figure 6 ), which is helpful to improve the accuracy of the subsequent detection circuit.

[0029] As shown in Figure 4 , the processing unit 4 includes a comparator U2A, a first threshold voltage module, a comparator U2B, a second threshold voltage module, a light emitting diode LED3 and a light emitting diode LED4.

[0030] Among them, the positive input terminal of the comparator U2A is connected with the first threshold voltage module, and the output terminal is connected to the positive electrode of the light emitting diode LED3; at the same time, the positive electrode of the light emitting diode LED3 is connected to the direct current power supply through the resistor R5, and the negative electrode is grounded through the resistor R6. The threshold voltage Vmin is provided to the positive input terminal of the comparator U2A by the first threshold voltage module.

[0031] More specifically, the first threshold voltage module includes a resistor R2, a resistor R3 and a capacitor C3; the resistor R2 and the resistor R3 are connected in series, one end of which is connected to the direct current power supply, and the other end of which is grounded; the capacitor C3 is connected in parallel to the resistor R3, and the connection point of the resistor R2 and the resistor R3 is connected to the positive input terminal of the comparator U2A. The direct current power supply is divided by the resistor R2 and the resistor R3, and is filtered and stabilized by the capacitor C3, so as to make the threshold voltage Vmin more stable.

[0032] The negative input terminal of the comparator U2B is connected with the second threshold voltage module, and the output terminal is connected with the positive electrode of the light emitting diode LED4; meanwhile, the positive electrode of the light emitting diode LED4 is connected with the direct current power supply through the resistor R15, and the negative electrode is connected with the ground through the resistor R18. The threshold voltage Vmax is provided to the negative input terminal of the comparator U2B by the second threshold voltage module.

[0033] More specifically, the second threshold voltage module comprises the resistor R19, the resistor R20 and the capacitor C6; the resistor R19 and the resistor R20 are connected in series, one end of which is connected with the direct current power supply, and the other end of which is connected with the ground; the capacitor C6 is connected in parallel with the resistor R20, and the connection node between the resistor R19 and the resistor R20 is connected with the negative input terminal of the comparator U2B.

[0034] As shown in Figures 1 to 4 , the specific connection relationship between the thyristor module 1 and the trigger signal detection unit 2, the voltage acquisition unit 3 and the processing unit 4 is as follows:

[0035] As shown in Figure 1 and Figure 2 , the control electrode of the thyristor module 1 is connected with the trigger signal detection unit 2. Specifically, the control electrode of the reverse thyristor D1 is connected with the resistor R1, so that it is connected with the positive electrode of the light emitting diode LED1 through the resistor R1, and the negative electrode of the light emitting diode LED1 is connected with the ground. The control electrode of the forward thyristor D2 is connected with the resistor R4, so that it is connected with the positive electrode of the light emitting diode LED2 through the resistor R4, and the negative electrode of the light emitting diode LED2 is connected with the ground.

[0036] As shown in Figure 1 and Figure 3 , the input terminal VIN and the output terminal VOUTT of the thyristor module 1 are connected with the input terminal of the voltage acquisition unit 3. Specifically, the input terminal VIN of the thyristor module 1 is connected with the positive input terminal of the proportional amplifier U1A after being divided, and the output terminal VOUTT is connected with the negative input terminal of the proportional amplifier U1A after being divided.

[0037] More specifically, the input end VIN is connected with the resistor R12 and the resistor R14 in sequence, and the other end of the resistor R14 is grounded, and the connecting node between the resistor R12 and the resistor R14 is connected to the positive input end of the proportional amplifier U1A through the resistor R13, so that the input end VIN is connected to the positive input end of the proportional amplifier U1A after being divided by the resistor R12 and the resistor R14. Among them, the resistor R12 and the resistor R14 play a voltage dividing role, and the resistor R13 plays a current limiting role. Similarly, the output end VOUTT is connected with the resistor R10 and the resistor R9 in sequence, and the other end of the resistor R9 is grounded, and the connecting node between the resistor R10 and the resistor R9 is connected to the negative input end of the proportional amplifier U1A through the resistor R11, so that the output end VOUTT is connected to the positive input end of the proportional amplifier U1A after being divided by the resistor R10 and the resistor R9. Among them, the resistor R10 and the resistor R9 play a voltage dividing role, and the resistor R11 plays a current limiting role to protect the proportional amplifier U1A.

[0038] As shown in Figure 1 , Figure 3 and Figure 4 , the output end of the voltage acquisition unit 3 is connected to the input end of the processing unit 4. Specifically, the output end of the proportional amplifier U1A is connected to the negative input end of the comparator U2A and the positive input end of the comparator U2B. The output end of the proportional amplifier U1A provides an input voltage Vin1 to the negative input end of the comparator U2A and an input voltage Vin2 to the positive input end of the comparator U2B. Of course, the value of the input voltage Vin1 is equal to the value of the input voltage Vin2.

[0039] As a preferred, it further comprises the resistor R7 and the resistor R17; the output end of the proportional amplifier U1A is connected to the negative input end of the comparator U2A through the resistor R7 and to the positive input end of the comparator U2B through the resistor R17. Among them, the resistor R7 and the resistor R17 play a current limiting role to protect the proportional amplifier U1A and the comparator U2B.

[0040] As shown in Figures 1 to 4 , the working principle of the utility model is roughly as follows:

[0041] (1) Trigger signal detection unit 2: when the control electrode of the thyristor module 1 has a normal trigger signal, the light-emitting diode LED1 and the light-emitting diode LED2 light normally light up; when the control electrode of the thyristor module 1 has no trigger signal, the light-emitting diode LED1 and the light-emitting diode LED2 are extinguished.

[0042] (2) Voltage acquisition unit 3: the voltage difference between the two ends of the thyristor module 1 (i.e. the input end VIN and the output end VOUTT) is divided and sampled, and then the sampled voltage is lifted and amplified by the proportional amplifier U1A.

[0043] (3) Processing unit 4: threshold voltage Vmin is the conduction threshold of thyristor module 1, threshold voltage Vmax is the cutoff threshold of thyristor module 1. When detecting, the output voltage of the proportional amplifier U1A is compared with the two threshold voltages by the processing unit 4:

[0044] When the light-emitting diode LED3 is on, it means that the output voltage Vin1 is less than the threshold voltage Vmin, and the thyristor module 1 is in a conduction state.

[0045] When the light-emitting diode LED4 is on, it means that the output voltage Vin2 is greater than the threshold voltage Vmax, that is, the thyristor module 1 is in a cutoff state.

[0046] When both LED3 and LED4 are off, it means that the threshold voltage Vmin is less than the output voltage Vin1 and the output voltage Vin2 is less than the threshold voltage Vmax, that is, the thyristor module 1 is in a half-conduction and half-cutoff state.

[0047] As shown in Figures 1 to 5 When the personnel use the utility model for fault detection, the approximate steps are as follows:

[0048] Step (a1), when the light-emitting diode LED1 and the light-emitting diode LED2 are not on, it means that the thyristor module 1 has no trigger signal input, and further observation of the light-emitting diode LED3 is needed to determine whether the thyristor module 1 has a short circuit fault;

[0049] Step (a2), when the light-emitting diode LED3 is on, it means that the output voltage Vin1 is less than the threshold voltage Vmin, the voltage difference between the two ends of the thyristor module 1 is abnormal, and the thyristor module 1 has a short circuit fault; when the light-emitting diode LED3 is not on, further observation of the light-emitting diode LED4 is needed to determine whether the thyristor module 1 is in a cutoff state;

[0050] Step (a3), when the light-emitting diode LED4 is not on, it means that the thyristor module 1 has not been in a cutoff state all the time, and a sudden short circuit may have occurred, that is, the thyristor module 1 has other fault problems; when the light-emitting diode LED4 is on, it means that the thyristor module 1 is in a cutoff state without trigger signal, and the cutoff function is normal.

[0051] Step (b1), when the light-emitting diode LED1 and the light-emitting diode LED2 are both on, it means that the thyristor module 1 has a trigger signal input, and further observation of the light-emitting diode LED4 is needed to determine whether the thyristor module 1 has an open circuit fault;

[0052] Step (b2), when the light-emitting diode LED4 is on, it indicates that the output voltage Vin2>Vmax, the difference voltage across the thyristor module 1 is abnormal, and the thyristor module 1 has an open circuit fault; when the light-emitting diode LED4 is not on, the light-emitting diode LED3 is further observed to determine whether the thyristor module 1 is in the on state;

[0053] Step (b3), when the light-emitting diode LED3 is not on, it indicates that the thyristor module 1 is not in the on state all the time, and there may be a sudden open circuit, i.e., the thyristor module 1 has other fault problems. When the light-emitting diode LED3 is on, it indicates that the output voltage Vin1Vmin, the thyristor module 1 is in the on state when there is a trigger signal, and the on function is normal.

[0054] Step (c1), when the light-emitting diodes LED1 and LED2 are both on, the light-emitting diode LED4 is not on and the light-emitting diode LED3 is on, indicating that the thyristor module 1 is in the on state when there is a trigger signal input; at the same time, when the light-emitting diodes LED1 and LED2 are both not on, the light-emitting diode LED3 is not on and the light-emitting diode LED4 is on, indicating that the thyristor module 1 is in the off state when there is no trigger signal input; further indicating that the on function and the off function of the thyristor module 1 are both normal, and there is no fault.

[0055] In other words, the detection results can be divided into four cases:

[0056] When only the light-emitting diodes LED1, LED2 and LED4 are on, the thyristor module 1 has an open circuit fault.

[0057] When the light-emitting diodes LED1 and LED2 are not on, and only the light-emitting diode LED3 is on, the thyristor module 1 has a short circuit fault.

[0058] Whether the light-emitting diodes LED1 and LED2 are both on or not, when the light-emitting diodes LED3 and LED4 are not on, the thyristor module 1 has other fault problems.

[0059] When the light-emitting diodes LED1 and LED2 are both on, the light-emitting diode LED4 is not on and the light-emitting diode LED3 is on, and when the light-emitting diodes LED1 and LED2 are not on, the light-emitting diode LED3 is not on and the light-emitting diode LED4 is on, the thyristor module 1 is normal and has no fault.

[0060] The above merely is the specific implementation manner of the present application, but the design concept of the present application is not limited to this, and any non-essential change of the present application by using the concept should belong to the act of infringing the protection scope of the present application.

Claims

1. A detection circuit for a thyristor module, comprising the thyristor module to be detected, characterized in that: It also includes a trigger signal detection unit, a voltage acquisition unit, and a processing unit; The control electrode of the thyristor module is connected to a trigger signal detection unit; The voltage acquisition unit includes a proportional amplifier U1A, a resistor R16, and a capacitor C5; the resistor R16 and the capacitor C5 are connected in parallel between the positive input terminal and the output terminal of the proportional amplifier U1A. The processing unit includes a comparator U2A, a first threshold voltage module, a comparator U2B, a second threshold voltage module, a light-emitting diode (LED3), and a light-emitting diode (LED4). The positive input terminal of the comparator U2A is connected to the first threshold voltage module, and its output terminal is connected to the positive terminal of the LED3. Simultaneously, the positive terminal of the LED3 is connected to a DC power supply via resistor R5, and its negative terminal is grounded via resistor R6. The negative input terminal of the comparator U2B is connected to the second threshold voltage module, and its output terminal is connected to the positive terminal of the LED4. Simultaneously, the positive terminal of the LED4 is connected to a DC power supply via resistor R15, and its negative terminal is grounded via resistor R18. Furthermore, the input terminal VIN of the thyristor module is connected to the positive input terminal of the proportional amplifier U1A after voltage division, and the output terminal VOUTT is connected to the negative input terminal of the proportional amplifier U1A after voltage division; the output terminal of the proportional amplifier U1A is connected to the negative input terminal of the comparator U2A, and simultaneously connected to the positive input terminal of the comparator U2B.

2. The detection circuit for a thyristor module according to claim 1, characterized in that: The voltage acquisition unit also includes a capacitor C4, a resistor R8, and a DC power supply AV; after the capacitor C4 and the resistor R8 are connected in parallel, one end is connected to the DC power supply AV, and the other end is connected to the negative input terminal of the proportional amplifier U1A.

3. The detection circuit for a thyristor module according to claim 2, characterized in that: The trigger signal detection unit includes a resistor R1, a light-emitting diode LED1, a resistor R4, and a light-emitting diode LED2; in the thyristor module, the control electrode of the reverse thyristor D1 is connected to the positive electrode of the light-emitting diode LED1 via the resistor R1, and the negative electrode of the light-emitting diode LED1 is grounded; the control electrode of the forward thyristor D2 is connected to the positive electrode of the light-emitting diode LED2 via the resistor R4, and the negative electrode of the light-emitting diode LED2 is grounded.

4. A detection circuit for a thyristor module according to any one of claims 1-3, characterized in that: The first threshold voltage module includes resistor R2, resistor R3 and capacitor C3; resistors R2 and R3 are connected in series, with one end connected to a DC power supply and the other end grounded; capacitor C3 is connected in parallel with resistor R3, and the connection point of resistors R2 and R3 is connected to the positive input terminal of comparator U2A.

5. A detection circuit for a thyristor module according to any one of claims 1-3, characterized in that: The second threshold voltage module includes resistor R19, resistor R20 and capacitor C6; resistor R19 and resistor R20 are connected in series, one end is connected to a DC power supply and the other end is grounded; capacitor C6 is connected in parallel with resistor R20, and the connection node between resistor R19 and resistor R20 is connected to the negative input terminal of comparator U2B.

6. The detection circuit for a thyristor module according to claim 1, characterized in that: It also includes resistors R7 and R17; the output terminal of the proportional amplifier U1A is connected to the negative input terminal of the comparator U2A via resistor R7, and to the positive input terminal of the comparator U2B via resistor R17.

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