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A Simulation Equivalent Circuit of Thyristor Reverse Recovery Process

A reverse recovery and equivalent circuit technology, applied in the field of efficient circuits, can solve problems such as difficulties, thyristor damage, difficulty in accurately suppressing voltage overshoot, etc., and achieve the effect of strong guidance.

Active Publication Date: 2012-02-01
CHINA XD ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the static situation, the stability of the thyristor is quite high, but in the dynamic situation, due to the influence of the external circuit, it is often damaged due to overvoltage at both ends of the thyristor. The voltage overshoot generated by the presence of
[0003] In the conventional design, the calculation of the reverse recovery overshoot generated when the thyristor is turned off ignores the influence of the thyristor itself on the magnitude of the overshoot, that is to say, only external factors are considered and the influence of the recovery charge of the thyristor itself on the voltage overshoot is ignored. Impact of punch size
The recovery charge is a microscopic dynamic value. The recovery charge is different under different operating conditions. It is difficult to accurately calculate the reverse recovery voltage overshoot of the thyristor at a certain turn-off time, and it is even more difficult to accurately suppress the voltage overshoot.

Method used

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  • A Simulation Equivalent Circuit of Thyristor Reverse Recovery Process
  • A Simulation Equivalent Circuit of Thyristor Reverse Recovery Process
  • A Simulation Equivalent Circuit of Thyristor Reverse Recovery Process

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Embodiment Construction

[0013] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0014] refer to figure 1 , is a simulated equivalent circuit of the reverse recovery process of a thyristor, including: voltage-controlled voltage sources V q , the first electronic switch Sw using IGBT, and the recovery capacitor C q , to form a charging circuit; the second electronic switch Sg using IGBT and the discharging resistor R are connected in series in sequence q , parasitic inductance L, composed of recovery capacitance C q The discharge path of the thyristor; when the thyristor is turned on, the second electronic switch Sg is closed, the first electronic switch Sw is opened, and the capacitor C is restored q Charge the reverse recovery charge Q rr ; When the thyristor turns off, the recovery capacitor C q After the charging is completed, turn off the first electronic switch Sw, turn on the second electronic switch Sg...

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Abstract

The invention relates to the technical field of high-voltage power electronics, in particular to a simulation equivalent circuit of a thyristor reverse recovery process. It includes: a voltage source, a first electronic switch, and a recovery capacitor connected in series in sequence to form a charging circuit; a second electronic switch, a discharge resistor, and a parasitic inductance connected in series in sequence to form a discharge path for the recovery capacitor; Two electronic switches, turn on the first electronic switch, the recovery capacitor is charged with reverse recovery charge; when the thyristor is turned off, the recovery capacitor charging is completed, the first electronic switch is turned off, the second electronic switch is turned on, the discharge current of the recovery capacitor is the thyristor reverse to the recovery current.

Description

technical field [0001] The invention relates to the technical field of high-voltage power electronics, in particular to a simulation equivalent circuit of a thyristor reverse recovery process. Background technique [0002] Thyristors, also known as silicon-controlled rectifiers - SCR, are widely used in high-voltage direct current transmission due to their ability to withstand high voltage and current capacity. As the basic unit of the converter valve of the core equipment of HVDC power transmission, the thyristor's stable and reliable operation is the key to the reliable operation of the converter valve. In the static situation, the stability of the thyristor is quite high, but in the dynamic situation, due to the influence of the external circuit, it is often damaged due to overvoltage at both ends of the thyristor. The voltage overshoot caused by the presence of [0003] In the conventional design, the calculation of the reverse recovery overshoot generated when the thy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 王文奇李侠刘宁
Owner CHINA XD ELECTRIC CO LTD