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A method of controlling thyristor by pulse width

A pulse width control, thyristor technology, applied in pulse technology, output power conversion devices, electronic switches, etc., can solve the problems of single, inconvenient specific operation, inconvenient to switch between wide/narrow pulse groups flexibly, and achieve flexible switching , easy to use effect

Active Publication Date: 2022-02-18
浙江杜成实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the control method of the thyristor is generally realized by the narrow pulse wave sent by the pulse generator, and the narrow pulse wave is not modulated, but in the process of practical application, depending on the working mode of the thyristor, sometimes it is necessary to perform pulse Wide / narrow switching of the control signal, for example, in the control of a three-phase fully-controlled rectifier circuit, it is necessary to control the thyristor through a double narrow pulse group, while in a single-phase or three-phase AC circuit, it is necessary to control the thyristor through a wide pulse group The control method of the thyristor in the prior art is relatively simple, and it is not convenient to switch between wide / narrow pulse groups flexibly, so it is inconvenient in specific operation

Method used

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  • A method of controlling thyristor by pulse width

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method of controlling a thyristor by pulse width, the method comprising the steps of:

[0030] S1. Signal acquisition: sampling the voltage of the control grid through synchronous transformer acquisition, and performing step-down processing on the sampled voltage signal;

[0031] S2. Generation of single pulse group: the voltage signal collected by the synchronous transformer is sent to the phase-shift trigger, and the single pulse group is generated by the phase-shift trigger;

[0032] S3. Pulse width switching: the single pulse group generated by the phase-shift trigger is switched to output a wide pulse group or a narrow pulse group through an analog switch;

[0033] S4, the wide pulse group output in step S3 directly controls the thyristor through the driving circuit;

[0034] S5. The narrow pulse group output in step S3 generates a double narrow pulse group through a double pulse former, and the double narrow pulse group controls the thyristor through a driving ...

Embodiment 2

[0040] The difference from Example 1 is that it also includes the following:

[0041] In step S3, the model of the analog switch is ISL54062, and the analog switch has a selection terminal E, an input terminal A and an output terminal B. When the selection terminal E is in the selection state, the state of the output terminal B depends on the state of the input terminal A. When the strobe terminal E is in a cut-off state, the output terminal B is in a high-impedance state.

[0042] The truth table for the analog switch is as follows:

[0043] E A B 1 0 1 1 0 0 high resistance state

[0044] That is, when the gate E is in the normally open state, the analog switch outputs a wide pulse group, and when the gate E is in a cycle on-off state, the analog switch outputs a narrow pulse group.

Embodiment 3

[0046] The difference from Example 2 is that it also includes the following:

[0047] In step S3, a high-frequency modulator is connected to the output end of the analog switch, and the high-frequency modulator is used to perform high-frequency modulation on the pulse output by the analog switch, thereby filtering the output pulse signal.

[0048] The pulse signal output by the analog switch is subjected to high-frequency modulation by the high-frequency modulator to realize the filtering function, so that the output wide pulse group and narrow pulse group have higher quality and thus have a better control effect.

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Abstract

The invention discloses a method for controlling a thyristor through a pulse width, which includes signal acquisition, generation of a single pulse group, pulse width switching, wide pulse group controlling the thyristor through a driving circuit and double narrow pulse groups passing through a driving circuit to control the thyristor. Thyristors are used to control and other steps. The beneficial effects of the present invention are that the voltage of the control grid is sampled and stepped down through the synchronous transformer, the collected voltage signal is processed into a single pulse group through the phase-shift trigger, and the wide pulse is carried out through the analog switch. Switching between group and narrow pulse group, when the output is a wide pulse group, the wide pulse group is directly sent to the drive circuit to control the thyristor, when the output is a narrow pulse group, it is processed into a double narrow pulse group by a double pulse former The pulse group is then sent to the control circuit to control the thyristor, so as to realize the flexible switching of wide / narrow pulse group, making it easy to use.

Description

technical field [0001] The invention relates to the technical field of thyristor control methods, in particular to a method for controlling a thyristor through pulse width. Background technique [0002] The thyristor is also called silicon controlled rectifier. The thyristor is a PNPN four-layer semiconductor structure. It has three poles: anode, cathode and gate. The working conditions of the thyristor are: forward voltage is applied and the gate has trigger current; its derivative Devices include: fast thyristors, bidirectional thyristors, reverse-conducting thyristors, light-controlled thyristors, etc. Thyristors have the characteristics of silicon rectifier devices, can work under high voltage and high current conditions, and their working process can be controlled, and are widely used in controllable In electronic circuits such as rectification, AC voltage regulation, non-contact electronic switch, inverter and frequency conversion. [0003] There are many types of thy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/06H03K17/56
CPCH02M1/06H03K17/56
Inventor 杜伟
Owner 浙江杜成实业有限公司