CN213181877U - Thyristor fault detection device - Google Patents
Thyristor fault detection device Download PDFInfo
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- CN213181877U CN213181877U CN202021165409.6U CN202021165409U CN213181877U CN 213181877 U CN213181877 U CN 213181877U CN 202021165409 U CN202021165409 U CN 202021165409U CN 213181877 U CN213181877 U CN 213181877U
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- thyristor
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Abstract
The utility model discloses a thyristor fault detection device, including the thyristor, diode D1, photoelectric coupler, triode Q1, photoelectric converter, the thyristor is half-wave rectification through diode D1, again enter into photoelectric coupler through resistance R1, through the base input voltage value of photoelectric coupler level conversion back through resistance R2 partial pressure adjustment triode, through opening and shutting down of controlling this triode and controlling photoelectric converter, the thyristor does not have voltage at both ends when normally opening, both ends recovery voltage after normally shutting down. When the photoelectric converter is switched on, the thyristor is not switched on, the thyristor has input, and the photoelectric converter has light signals to be transmitted. When the photoelectric converter is turned off, the thyristor is not input with voltage, and the photoelectric converter cannot output signals. Therefore, whether the thyristor has a fault can be judged by monitoring the state of the voltage at the two ends of the thyristor, and the photoelectric converter outputs an optical electric signal to control the on and off of the next-stage switch.
Description
Technical Field
The utility model relates to a thyristor (silicon controlled rectifier) application, in particular to be used for carrying out on-line measuring's device to thyristor on-off state.
Background
The thyristor can control a large current of hundreds to thousands of amperes only by using a current of tens to hundreds of milliamperes, so that the control of weak current on strong current is realized. The thyristor is matched with other power electronic devices, and is widely applied to multiple fields of controllable rectification, inversion, motor speed regulation, motor excitation, contactless switching, automatic control and the like.
In the operation logic of a static transfer switch, only one power supply can be allowed to supply power to a load at any time, that is, when one power supply is connected to the load, the other power supply must be cut off from the load, and the two power supplies are simultaneously switched on, so that circulating current between the power supplies is generated, and disastrous results such as damage to the power supplies or thyristors are generated. In order to avoid the common connection of two power supplies, the high-reliability static transfer switch must have the following functions: if a short circuit is found in a thyristor, the load is deadlocked to the power supply corresponding to the thyristor without switching. Therefore, it is very important for the operation performance of the static transfer switch to quickly and reliably detect the short-circuit fault of the thyristor. Therefore, the detection of the short-circuit fault of the thyristor and the switching on and off of the next-stage switch by using the fault obtained by judgment are urgent needs of the current market.
Disclosure of Invention
An object of the utility model is to provide a thyristor fault detection device judges whether the thyristor breaks down through the state of control thyristor both ends voltage to convert voltage switching value signal into light signal, make the switch of light signal one-level after can being used for the drive, control switches on and shuts off.
In order to solve the technical problem, the utility model provides a thyristor fault detection device, including thyristor, plug J1, diode D1, photoelectric coupler, triode Q1, photoelectric converter, plug J1 docks the negative pole and the positive pole of thyristor, series connection diode D1 between plug J1's the positive and negative pin, and diode D1's positive pole, negative pole are connected to respectively photoelectric coupler's input pin, photoelectric coupler's output pin is connected to triode Q1's base, triode Q1's projecting pole ground connection, and the collecting electrode is connected to photoelectric converter's pin.
Further, a current limiting resistor R1 is connected in series between the cathode of the diode D1 and the input pin of the photoelectric coupler.
Further, a divider resistor R2 is connected in series between the output pin of the photoelectric coupler and the base of the triode Q1.
Preferably, one end of the voltage dividing resistor R2, which is connected to the output pin of the photocoupler, is also grounded through a resistor R3.
Further, the base of the transistor Q1 is also grounded through a capacitor C1 and a resistor R4.
Further, the photoelectric converter comprises an optical fiber emitter, the cathode of the optical fiber emitter is connected in parallel with a resistor R5 and a diode D2, the other end of the resistor R5 is connected with the collector of a transistor Q1, and the cathode of the diode D2 is connected with the anode of the optical fiber emitter through a light emitting diode LED 1.
Preferably, the photoelectric converter and the photoelectric coupler are powered by a standard power supply Vp.
Preferably, IN5407 is selected as the diode D1.
Preferably, the photoelectric coupler is 4N 25.
Preferably, the fiber emitter is HFBR-1414T.
The utility model discloses a thyristor is half-wave rectification through diode D1, enters into photoelectric coupler through flow resistance R1 again, through photoelectric coupler level conversion after through the base input voltage value of resistance R2 partial pressure adjustment triode, through controlling opening and turn-off of this triode to control opening and turn-off of photoelectric converter.
The two ends of the thyristor have no voltage when being normally switched on, and the two ends recover the voltage after being normally switched off. When the photoelectric converter is switched on, the thyristor is not switched on, and the thyristor has input, so that the photoelectric converter has light signals to be transmitted. The switch-off is not carried out, the thyristor has no voltage input, and the photoelectric converter has no signal output. Therefore, whether the thyristor fails or not can be judged by monitoring the voltage state at the two ends of the thyristor, and the photoelectric converter outputs an optical electric signal for controlling the on and off of the next-stage switch, so that photoelectric isolation can be realized.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of the thyristor fault detection device of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, a thyristor fault detection device includes a thyristor, a diode D1, a photocoupler N1, a triode Q1, and a photoelectric converter 9, wherein an anode and a cathode of the thyristor are butted with a plug J1, a diode D1 is connected in series between positive and negative pins of the plug J1, an anode and a cathode of the diode D1 are respectively connected to an input terminal pin 2 and a pin 1 of the photocoupler N1, an output pin 4 of the photocoupler N1 is connected to a base B of the triode Q1, an emitter E of the triode Q1 is grounded, and a collector C is connected to a pin of the photoelectric converter 9. A current limiting resistor R1 is also connected in series between the cathode of the diode D1 and the input pin 1 of the photocoupler N1, a voltage dividing resistor R2 is connected in series between the output pin 4 of the photocoupler N1 and the base B of the triode Q1, one end of the voltage dividing resistor R2 connected with the output pin 1 of the photocoupler N1 is also grounded through a resistor R3, the base B of the triode Q1 is also grounded through a capacitor C1 and a resistor R4, the photoelectric converter 9 comprises a fiber emitter HFBR-1414T, the cathode 3 of the fiber emitter HFBR-1414T is connected in parallel with a resistor R5 and a diode D2, the other end of the resistor R5 is connected with the collector C of the triode Q1, and the cathode of the diode D2 is connected with the anode pins 2, 6 and 7 of the fiber emitter HFBR-1414T through a light emitting diode LED 1. The photoelectric converter 9 and the photoelectric coupler N1 are powered by a standard power supply Vp, the diode D1 adopts IN5407, the diode D2 adopts IN4148, the photoelectric coupler N1 adopts 4N25, and the triode Q1 adopts an NPN triode.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood that the invention is not limited thereto, and that various modifications and changes can be made by those skilled in the art without departing from the principles of the invention.
Claims (8)
1. A thyristor fault detection device comprises a thyristor, a diode D1, a photoelectric coupler, a triode Q1 and a photoelectric converter, and is characterized in that the diode D1 is connected between the cathode and the anode of the thyristor in series, the anode and the cathode of the diode D1 are respectively connected to an input pin of the photoelectric coupler, an output pin of the photoelectric coupler is connected to the base electrode of the triode Q1, the emitting electrode of the triode Q1 is grounded, and the collecting electrode of the triode Q1 is connected to a pin of the photoelectric converter.
2. The thyristor fault detection device of claim 1, wherein a current limiting resistor R1 is further connected in series between the negative electrode of the diode D1 and the input pin of the optocoupler.
3. The thyristor fault detection device of claim 1, wherein a voltage dividing resistor R2 is connected in series between the output pin of the photoelectric coupler and the base of the transistor Q1.
4. The thyristor fault detection device of claim 3, wherein one end of the voltage dividing resistor R2 connected with the output pin of the optoelectronic coupler is further grounded through a resistor R3.
5. The thyristor fault detector assembly of claim 3, wherein the base of the transistor Q1 is further coupled to ground through a capacitor C1 and a resistor R4.
6. The thyristor fault detection device of claim 1, wherein the optical-to-electrical converter comprises an optical fiber transmitter, the optical fiber transmitter is HFBR-1414T, a cathode pin 3 of the optical fiber transmitter is connected in parallel with a resistor R5 and an anode of a diode D2, the other end of the resistor R5 is connected with a collector of a triode Q1, a cathode of the diode D2 is connected with anode pins 2, 6, and 7 of the optical fiber transmitter through a light emitting diode LED1, the optical-to-electrical converter and the optical coupler are powered by a standard power supply Vp, the standard power supply Vp electrically connects a cathode of the diode D2 and an anode of the light emitting diode LED1, and a cathode of the light emitting diode LED1 is connected with the anode pins 2, 6, and 7 of the optical fiber transmitter.
7. The thyristor fault detection device of claim 1, wherein IN5407 is selected as the diode D1.
8. The thyristor fault detection device of claim 1, wherein the optoelectronic coupler is 4N 25.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021165409.6U CN213181877U (en) | 2020-06-22 | 2020-06-22 | Thyristor fault detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021165409.6U CN213181877U (en) | 2020-06-22 | 2020-06-22 | Thyristor fault detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213181877U true CN213181877U (en) | 2021-05-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021165409.6U Active CN213181877U (en) | 2020-06-22 | 2020-06-22 | Thyristor fault detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213181877U (en) |
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2020
- 2020-06-22 CN CN202021165409.6U patent/CN213181877U/en active Active
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