Unlock instant, AI-driven research and patent intelligence for your innovation.

Thyristor breakdown detecting circuit

A detection circuit and thyristor technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problem of unable to control the feedback signal of the thyristor control circuit, and achieve the effect of avoiding personal and equipment safety accidents

Inactive Publication Date: 2013-04-03
齐齐哈尔齐力达电子有限公司
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a thyristor breakdown detection circuit to solve the problem that the existing thyristor detection technology only performs fault identification but cannot feed back signals to the thyristor control circuit.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Thyristor breakdown detecting circuit
  • Thyristor breakdown detecting circuit
  • Thyristor breakdown detecting circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Such as image 3 As shown, if the thyristor is not conducting, the sampling terminals AC1 and AC2 are AC high voltages at both ends of the thyristor (relative to the voltage drop at both ends of the thyristor when the thyristor is conducting), when the thyristor is not conducting, the two The terminal voltage is rectified by DQ1 into a pulsating DC, so that the photocoupler U1 is turned on, and its output terminal (OUT terminal) gets a pulsating low level (because the input terminal of the photocoupler is a pulsating DC), and then uses the back-end Filtering of programmable logic circuits, or analog circuits, etc., to judge the state of the thyristor. If the thyristor should be in a conducting state at this time, but a pulsating low-level signal is detected, it can be judged that the thyristor is in an open-circuit damaged state.

[0017] If the thyristor is turned on, the sampling terminals AC1 and AC2 are only the voltage drop across the thyristor, so they cannot sup...

Embodiment 2

[0019] Such as Figure 4 As shown, the working principle of the thyristor state detection circuit in this embodiment is the same as that of the thyristor state detection circuit in Embodiment 1, except that the convenience of bidirectional conduction at the input end of the photocoupler saves image 3 The rectifier bridge DQ1 in the circuit makes the circuit more concise.

[0020] By adopting the technical solution provided in this specific embodiment, by sampling the voltage between the anode and the cathode of the thyristor and outputting a switching signal, when the thyristor breaks down, the voltage between the anode and the cathode is close to zero volts, and the circuit outputs High-level switching signal, when the thyristor does not break down, it outputs a low-level switching signal, and the thyristor trigger device receives the low-level switching signal, outputs a trigger signal to make the thyristor conduct; the thyristor trigger device receives a high-level switchi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a thyristor breakdown detecting circuit which comprises a photocoupling circuit and a trigger circuit. A sampling signal input end of the photocoupling circuit is connected with a voltage signal output end of a thyristor to be detected, a switching value signal output end of the photocoupling circuit is connected with a switching value signal input end of the trigger circuit, and a trigger signal output end of the trigger circuit is connected with a trigger signal input end of the thyristor on the north side. The thyristor breakdown detecting circuit samples voltage between a positive pole and a negative pole of the thyristor, the voltage between the positive pole and the negative pole when the thyristor breaks down is close to zero volt, the circuit outputs a high-level switching value signal, and when the thyristor does not break down, the circuit outputs a low-level switching value signal, a thyristor trigger device receives the low-level switching value signal and outputs a trigger signal to enable the thyristor to be connected. The thyristor trigger device receives the high-level switching value signal and does not output the trigger signal, so that personal injury and device safety accidents caused by thyristor breakdown are avoided.

Description

technical field [0001] The invention relates to a thyristor breakdown detection circuit, which belongs to the technical field of motor control. Background technique [0002] At present, the domestic motor commutation control system uses thyristors as non-contact switches instead of mechanical switch control. The control system uses electrical interlocks to control the commutation operation of the motor, which can avoid short circuits between phases when the main circuit of the thyristors is working normally. [0003] Since the thyristor is a controlled semiconductor switching element, failures such as breakdown and open circuit will inevitably occur during use. After the thyristor fails, it will affect the normal operation of the equipment, and even cause serious faults such as phase-to-phase short circuit, endangering equipment and personal safety. However, the current thyristor detection circuit only performs fault identification and cannot feed back signals to the thyris...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/27
Inventor 鲁广斌关慧军
Owner 齐齐哈尔齐力达电子有限公司