Drive and control circuit of large-power GTO

Abstract

The invention discloses a drive and control circuit of a large-power gate-turn-off thyristor (GTO), and belongs to the technical field of the drive and control of the large-power controllable thyristor. The drive and control circuit is divided into two parts: a logic control circuit and an energy output circuit; the two parts realize the reliable electric isolation from the providing of the powerenergy and the output of a control signal; and meanwhile, the logic control of the drive and control circuit is realized through an analog circuit, the code programming demand is unnecessary, and theelectromagnetic interference resistance of the drive and control circuit is greatly increased; and meanwhile; the logic control circuit can realize the smooth switch and seamless connection of variousenergy units of the energy output circuit at different switch-on / off stages through the precise cooperation of various control units; and finally, the drive and control circuit can safely and reliably drive and control the GTO, and realize the DC current with the highest switch-on and switch-off amplitude of 3500A.

Description

technical field [0001] The driving realization of high-power GTO (gate turn-off thyristor) has always been the main factor restricting the large-scale application of GTO. The invention designs a high-power GTO drive control circuit, which reliably and stably realizes GTO turn-on and turn-off, and belongs to the technical field of high-power controllable thyristor drive control. Background technique [0002] As a high-voltage and high-current bipolar full-control device, GTO has the advantages of high withstand voltage, large capacity, strong anti-surge capability, and convenient control. It has been used in locomotive traction, high-power AC motor speed control systems, Power electronic conversion and other fields are widely used as core components. Due to the structural characteristics of GTO itself, its turn-on and turn-off is controlled by the gate, and the driving power is much higher than that of ordinary thyristors, so the hardware implementation is difficult. At the...

AI Technical Summary

Problems solved by technology

[0003] The invention patent with the application number of 2016104040878 discloses a gate-turn-off thyristor low conduction maintenance circuit and control method. Although the logic control of the GTO drive circuit can be realized, the control unit uses an FPGA control chip, which needs to be coded for the control logic. The writing and implementation process is complicated, and the introduction of the control chip also reduces the electromagnetic compatibility of the drive circuit, and the logic control chip and the drive energy circuit are not reliably electrically isolated, which also reduces the reliability of the overall drive control

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