Driving signal fault detection circuit of thyristor module

Abstract

The utility model discloses a driving signal fault detection circuit of a thyristor module, which relates to the field of detection circuits and comprises a line sequence detection unit, a voltage acquisition unit and a processing unit. In the line sequence detection unit, the input ends of two optical couplers are respectively connected to two paths of driving signals of the thyristor module, and the output ends of the two optical couplers are respectively connected with a buzzer. A driving signal of the thyristor module is amplified by the voltage acquisition unit and then is connected to the input end of the processing unit, the driving signal is compared with a reference voltage, and the processing unit controls the on-off of the light emitting diode according to a comparison result. Therefore, whether the thyristor module has a driving signal fault or not can be intuitively reflected through the audible and visual alarm of the buzzer and the light emitting diode, and the device is reliable, low in cost and capable of being assembled on an alternating current power supply cabinet.

Description

TECHNICAL FIELD

[0001] The utility model relates to detection circuit field, concretely is a thyristor module's drive signal fault detection circuit. BACKGROUND

[0002] Thyristor module is a kind of power electronic device, and the circuit schematic diagram of a kind of existing thyristor module method is as shown in Figure 1 Thyristor D1 and thyristor D2 are mutually parallel and opposite in direction.The thyristor module is assembled in alternating current power supply cabinet, and when signal line K1 and signal line G1 have drive signal input, thyristor D2 is turned on, and output voltage VOUT is the positive half cycle of alternating current when signal line K2 and signal line G2 have drive signal input, thyristor D1 is turned on, and output voltage VOUT is the negative half cycle of alternating current.

[0003] It can be seen that if one of signal lines is short-circuited or open-circuited, or signal line connection is wrong, etc., it will cause thyristor module to be unable to work normally, and further cause alternating current power supply cabinet where thyristor module is located to be unable to work normally.Current alternating current power supply cabinet does not have the drive signal fault detection circuit of thyristor module, which brings inconvenience to equipment maintenance, and is time-consuming and laborious.Therefore, it is necessary to design a reliable, low-cost and intuitive drive signal fault detection circuit of thyristor module which can be assembled on alternating current power supply cabinet. SUMMARY

[0004] The utility model aims at providing a kind of drive signal fault detection circuit of thyristor module, and its purpose is to overcome the above-mentioned problems existing in prior art.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A kind of drive signal fault detection circuit of thyristor module, including the thyristor module to be detected, the thyristor D1 and thyristor D2 of the thyristor module are mutually parallel and opposite in direction, with the positive electrode of thyristor D2 in one end as voltage input terminal VIN, the other end is voltage output terminal VOUT;Signal line K1 is simultaneously taken as voltage output terminal VOUT, the control electrode of thyristor D2 is signal line G1, voltage input terminal VIN is signal line K2, and the control electrode of thyristor D1 is signal line G2;It also includes line sequence detection unit, and the line sequence detection unit includes photo-coupler U1, buzzer B1, photo-coupler U2 and buzzer B2, the diode anode of above-mentioned photo-coupler U1, diode cathode is connected to signal line K1 and signal line G1, and the output end is connected with buzzer B1;The diode anode of above-mentioned photo-coupler U2, diode cathode is connected to signal line K2 and signal line G2, and the output end is connected with buzzer B2.

[0007] Further, it further comprises a voltage acquisition unit and a processing unit,

[0008] The voltage acquisition unit comprises a proportional amplifier U3A, a resistor R7 and a capacitor C3, the resistor R7 and the capacitor C3 are connected in parallel between the positive input end and the output end of the proportional amplifier U3A; the processing unit comprises a comparator U4A, a light emitting diode LED1 and a reference voltage module, the output end of the reference voltage module is connected to the negative input end of the comparator U4A, and the output end of the comparator U4A is connected with the light emitting diode LED1.

[0009] The signal line K1 and the signal line G1 are connected to the negative input end and the positive input end of the proportional amplifier U3A respectively, and the output end of the proportional amplifier U3A is connected to the input end of the comparator U4A.

[0010] Preferably, the signal line K1 is connected to the negative input end of the proportional amplifier U3A through the resistor R4, and the signal line G1 is connected to the positive input end of the proportional amplifier U3A through the resistor R5.

[0011] Further, the voltage acquisition unit further comprises a proportional amplifier U3B, a resistor R17 and a capacitor C6; the resistor R17 and the capacitor C6 are connected in parallel between the positive input end and the output end of the proportional amplifier U3B; the processing unit further comprises a comparator U4B and a light emitting diode LED2, the output end of the reference voltage module is connected to the negative input end of the comparator U4B, and the output end of the comparator U4B is connected with the light emitting diode LED2.

[0012] The signal line K2 and the signal line G2 are connected to the negative input end and the positive input end of the proportional amplifier U3B respectively, and the output end of the proportional amplifier U3B is connected to the input end of the comparator U4B.

[0013] Preferably, the signal line K2 is connected to the negative input end of the proportional amplifier U3B through R14, and the signal line G2 is connected to the positive input end of the proportional amplifier U3B through R15.

[0014] Further, the reference voltage module comprises a direct current power supply, a resistor R8 and a resistor R9 connected in sequence, and the other end of the resistor R9 is grounded, and the connection node of the resistor R8 and the resistor R9 is the output end of the reference voltage module.

[0015] Further, the voltage acquisition unit further comprises a capacitor C2 and a resistor R6, the capacitor C2 and the resistor R6 are connected in parallel, one end is grounded, and the other end is connected to the negative input end of the proportional amplifier U3A; the voltage acquisition unit further comprises a capacitor C5 and a resistor R16, the capacitor C5 and the resistor R16 are connected in parallel, one end is grounded, and the other end is connected to the negative input end of the proportional amplifier U3B.

[0016] Compared with the prior art, the utility model has the advantages of:

[0017] Firstly, the line sequence detection unit of the utility model includes an optical coupler U1, a buzzer B1, an optical coupler U2 and a buzzer B2. It can intuitively reflect whether the wiring sequence of the two-way driving signal lines of the thyristor module is normal, saves time and effort, and has the characteristics of intuitiveness, reliability, low cost and being able to be assembled on an AC power supply cabinet.

[0018] Secondly, the utility model further includes a voltage acquisition unit and a processing unit, and the processing unit is provided with a light-emitting diode. The buzzer of the line sequence detection unit alarms from two aspects of sound and light, can intuitively reflect which kind of fault exists in the two-way driving signal lines of the thyristor module, facilitates symptomatic maintenance, is reliable and low in cost. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 In the utility model, the circuit principle diagram of the thyristor module.

[0020] Figure 2 In the utility model, the driving signal fault detection circuit. Among them, K1, G1, K2 and G2 represent the normal wiring positions of the four signal lines. DETAILED DESCRIPTION

[0021] The specific implementation of the utility model will be described below with reference to the drawings. In order to fully understand the utility model, many details are described below, but the utility model can be implemented without these details for those skilled in the art.

[0022] In order to facilitate the understanding of the utility model, it is necessary to explain the structure and use of the existing thyristor module:

[0023] For example, Figure 1 An existing thyristor module, thyristors D1 and D2 are connected in parallel and opposite directions, the thyristor D1 and D2 of the thyristor module are connected in parallel and opposite directions, one end of the positive electrode of the thyristor D2 is the voltage input end VIN, and the other end is the voltage output end VOUT; at the same time, the voltage output end VOUT is the signal line K1, the control electrode of the thyristor D2 is the signal line G1, the voltage input end VIN is the signal line K2, and the control electrode of the thyristor D1 is the signal line G2. The thyristor module is assembled in an AC power supply cabinet, and after AC (i.e. output voltage VIN) is input into the thyristor module, when the signal line K1 and the signal line G1 have driving signal input, the thyristor D2 is turned on, and the output voltage VOUT is the positive half wave of the AC; when the signal line K2 and the signal line G2 have driving signal input, the thyristor D1 is turned on, and the output voltage VOUT is the negative half wave of the AC.

[0024] As shown in Figure 1 and Figure 2 A driving signal fault detection circuit of the above thyristor module, comprising the above thyristor module to be detected, a line sequence detection unit 1, a voltage acquisition unit 2 and a processing unit 3.

[0025] As shown in Figure 2 The line sequence detection unit 1 comprises optocoupler U1, buzzer B1, optocoupler U2 and buzzer B2. The anode and cathode of the diode of optocoupler U1 are connected to signal line K1 and signal line G1 respectively, and the output of optocoupler U1 is connected with buzzer B1. Similarly, the anode and cathode of the diode of optocoupler U2 are connected to signal line K2 and signal line G2 respectively, and the output of optocoupler U1 is connected with buzzer B2.

[0026] As shown in Figure 2 The voltage acquisition unit comprises proportional amplifier U3A, resistor R7, capacitor C3, proportional amplifier U3B, resistor R17 and capacitor C6. Resistor R7 and capacitor C3 are connected in parallel between the positive input and output of proportional amplifier U3A, forming a feedback circuit of proportional amplifier U3A, for improving the gain and stability of proportional amplifier U3A. Similarly, resistor R17 and capacitor C6 are connected in parallel between the positive input and output of proportional amplifier U3B, forming a feedback circuit of proportional amplifier U3B, for improving the gain and stability of proportional amplifier U3B.

[0027] As shown in Figure 2 The processing unit comprises comparator U4A, light emitting diode LED1, reference voltage module, comparator U4B and light emitting diode LED2. The output of the reference voltage module is connected to the negative input of comparator U4A, and the output of comparator U4A is connected with light emitting diode LED1. Similarly, the output of the reference voltage module is connected to the negative input of comparator U4B, and the output of comparator U4B is connected with light emitting diode LED2.

[0028] Specifically, the reference voltage module comprises DC power supply, resistor R8 and resistor R9 connected in sequence, and the other end of resistor R9 is grounded. The connection node of resistor R8 and resistor R9 is the output of the reference voltage module, for connecting comparator U4A and comparator U4B.

[0029] Specifically, the positive pole of the light emitting diode LED1 is connected with a direct current power source through a resistor R10, the negative pole of the light emitting diode LED1 is grounded through a resistor R11, and the connecting node of the light emitting diode LED1 and the resistor R10 is connected to the output end of the comparator U4A. Similarly, the positive pole of the light emitting diode LED2 is connected with a direct current power source through a resistor R18, the negative pole of the light emitting diode LED2 is grounded through a resistor R19, and the connecting node of the light emitting diode LED2 and the resistor R18 is connected to the output end of the comparator U4B.

[0030] As shown in Figure 1 and Figure 2 , the connection relationship between the above thyristor module, line sequence detection unit 1, voltage acquisition unit 2 and processing unit 3 is as follows:

[0031] As shown in Figure 1 and Figure 2 , the signal line K1 and the signal line G1 of the above thyristor module are connected to the negative input end and the positive input end of the proportional amplifier U3A respectively, and the output end of the proportional amplifier U3A is connected to the input end of the comparator U4A. At the same time, the signal line K2 and the signal line G2 of the above thyristor module are connected to the negative input end and the positive input end of the proportional amplifier U3B respectively, and the output end of the proportional amplifier U3B is connected to the input end of the comparator U4B.

[0032] As shown in Figure 1 and Figure 2 , as preferred, the signal line K1 is connected to the negative input end of the proportional amplifier U3A through the resistor R4, and the signal line G1 is connected to the positive input end of the proportional amplifier U3A through the resistor R5. Among them, the resistor R4 and the resistor R5 play a current limiting role to protect the proportional amplifier U3A. Similarly, as preferred, the signal line K2 is connected to the negative input end of the proportional amplifier U3B through R14, and the signal line G2 is connected to the positive input end of the proportional amplifier U3B through R15. Among them, the resistor R14 and the resistor R15 play a current limiting role to protect the proportional amplifier U3B.

[0033] As preferred, the voltage acquisition unit 2 further comprises a capacitor C2, a resistor R6, a capacitor C5 and a resistor R16. Among them, the capacitor C2 and the resistor R6 are connected in parallel, one end is grounded, and the other end is connected to the negative input end of the proportional amplifier U3A, which is used for filtering and eliminating voltage spikes, and helps to improve the accuracy of the subsequent detection circuit. Similarly, the capacitor C5 and the resistor R16 are connected in parallel, one end is grounded, and the other end is connected to the negative input end of the proportional amplifier U3B.

[0034] As shown in Figure 1 and Figure 2 , the working principle of the utility model is roughly as follows (the following wiring error refers to the connection error between the output line of the driving signal and the utility model):

[0035] It should be noted that signal line K1 and signal line G1 are the cathode and control electrode of one driving signal (such as a high-frequency signal of 9.6kHz), respectively, and signal line K2 and signal line G2 are the cathode and control electrode of another driving signal (such as a high-frequency signal of 9.6kHz), respectively.

[0036] 1. The wiring sequence of the four signal lines is correct (e.g., Figure 2 When the input voltage Vin1 is greater than the reference voltage Vref, comparator U4A outputs a high level, and LED1 lights up. Similarly, when the input voltage Vin2 is greater than the reference voltage Vref, comparator U4A outputs a high level, and LED2 lights up.

[0037] 2. When the voltage sampling line is broken, taking signal line G1 as an example, optocoupler U1 will not conduct, and therefore buzzer B1 will not sound. The drive signals of signal lines K1 and G1 are amplified by proportional amplifier U3A and then compared with the reference voltage Vref by comparator U4A. At this time, the input voltage Vin1 < the reference voltage Vref, comparator U4A outputs a low level (e.g., 0V), and LED1 turns off.

[0038] 3. When the signal lines of the same drive signal are out of order, taking the reverse connection of signal line G1 and signal line K1 as an example, optocoupler U1 conducts, buzzer B1 conducts, and an audible sound is emitted. The drive signals of signal lines K1 and G1 are amplified by proportional amplifier U3A and then compared with reference voltage Vref by comparator U4A. At this time, the input voltage Vin1 < the reference voltage Vref, comparator U4A outputs a low level (e.g., 0V), and LED1 turns off.

[0039] 4. When the signal lines of the two drive signals are out of order, taking the reverse connection of signal line K1 and signal line G2 as an example, both optocouplers U1 and U2 will conduct, and both buzzers B1 and B2 will conduct, emitting a sound. After the drive signal is amplified by proportional amplifier U3A, it passes through comparator U4A and is compared with the reference voltage Vref. At this time, the input voltage Vin1 < the reference voltage Vref, the comparator U4A outputs a low level (e.g., 0V), and LED1 turns off. Similarly, LED2 turns off.

[0040] The utility model discloses can through the sound light alarm of buzzer and emitting diode, directly reflect whether the thyristor module exists drive signal failure, and reliable, low in cost, can assemble on the alternating current power supply cabinet.

[0041] The above is only the specific implementation manner of the utility model, but the design concept of the utility model is not limited to this, and any non-essential change of the utility model by using the concept should belong to the act of infringing the protection scope of the utility model.

Claims

1. A drive signal fault detection circuit for a thyristor module, comprising a thyristor module to be detected, wherein thyristors D1 and D2 of the thyristor module are connected in parallel and in opposite directions, with one end of thyristor D2 containing the positive electrode as the voltage input terminal VIN and the other end as the voltage output terminal VOUT; simultaneously, the voltage output terminal VOUT is used as signal line K1, the control terminal of thyristor D2 is used as signal line G1, the voltage input terminal VIN is used as signal line K2, and the control terminal of thyristor D1 is used as signal line G2, characterized in that: It also includes a line sequence detection unit, which includes an optocoupler U1, a buzzer B1, an optocoupler U2, and a buzzer B2. The diode anode and cathode of the optocoupler U1 are connected to signal line K1 and signal line G1, respectively, and the output terminal is connected to the buzzer B1. The diode anode and cathode of the optocoupler U2 are connected to signal line K2 and signal line G2, respectively, and the output terminal is connected to the buzzer B2.

2. The drive signal fault detection circuit for a thyristor module according to claim 1, characterized in that: It also includes a voltage acquisition unit and a processing unit. The voltage acquisition unit includes a proportional amplifier U3A, a resistor R7, and a capacitor C3. The resistor R7 and capacitor C3 are connected in parallel between the positive input terminal and the output terminal of the proportional amplifier U3A. The processing unit includes a comparator U4A, a light-emitting diode LED1, and a reference voltage module. The output terminal of the reference voltage module is connected to the negative input terminal of the comparator U4A, and the output terminal of the comparator U4A is connected to the light-emitting diode LED1. The signal line K1 and signal line G1 are respectively connected to the negative input terminal and the positive input terminal of the proportional amplifier U3A, and the output terminal of the proportional amplifier U3A is connected to the input terminal of the comparator U4A.

3. The drive signal fault detection circuit for a thyristor module according to claim 2, characterized in that: The signal line K1 is connected to the negative input terminal of the proportional amplifier U3A via resistor R4, and the signal line G1 is connected to the positive input terminal of the proportional amplifier U3A via resistor R5.

4. A drive signal fault detection circuit for a thyristor module according to claim 2 or 3, characterized in that: The voltage acquisition unit also includes a proportional amplifier U3B, a resistor R17, and a capacitor C6; the resistor R17 and the capacitor C6 are connected in parallel between the positive input terminal and the output terminal of the proportional amplifier U3B; the processing unit also includes a comparator U4B and a light-emitting diode LED2; the output terminal of the reference voltage module is connected to the negative input terminal of the comparator U4B, and the output terminal of the comparator U4B is connected to the light-emitting diode LED2. The signal lines K2 and G2 are connected to the negative input and positive input terminals of the proportional amplifier U3B, respectively, and the output terminal of the proportional amplifier U3B is connected to the input terminal of the comparator U4B.

5. The drive signal fault detection circuit for a thyristor module according to claim 4, characterized in that: The signal line K2 is connected to the negative input terminal of the proportional amplifier U3B via R14, and the signal line G2 is connected to the positive input terminal of the proportional amplifier U3B via R15.

6. The drive signal fault detection circuit for a thyristor module according to claim 2, characterized in that: The reference voltage module includes a DC power supply, a resistor R8, and a resistor R9 connected in sequence, with the other end of the resistor R9 grounded. The connection point between the resistor R8 and the resistor R9 is the output terminal of the reference voltage module.

7. The drive signal fault detection circuit for a thyristor module according to claim 4, characterized in that: The voltage acquisition unit also includes a capacitor C2 and a resistor R6. After the capacitor C2 and the resistor R6 are connected in parallel, one end is grounded and the other end is connected to the negative input terminal of the proportional amplifier U3A. The voltage acquisition unit also includes a capacitor C5 and a resistor R16. After the capacitor C5 and the resistor R16 are connected in parallel, one end is grounded and the other end is connected to the negative input terminal of the proportional amplifier U3B.

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