Title :
Development of the high voltage power switching circuit with GTOs operated by new gate-drive system
Author :
Kawabata, Osamu ; Oshitani, Katsumi
Author_Institution :
Mitsubishi Heavy Ind. Ltd., Nagoya, Japan
Abstract :
A high-voltage high-power switching circuit using six gate turn-off thyristors (GTOs) in series operated by a novel gate-drive system has been developed and successfully demonstrated. The new gate-drive system consists of a trigger pulse generator, high-frequency switching circuit with transistors, a high frequency-transformer (current transformer) with single input and multiple outputs, and a flux compensating circuit for offsetting of magnetic fluxes in the high-frequency transformer. This gate-drive system is less disturbed by electrical noises and operates in large current signal mode. The high-voltage stage in this new gate-drive system can be set with GTOs in an air-tight tank filled with insulating oil. The high-voltage switching circuit with six GTOs in series operated by this system has been rated at a voltage of 30 kV and a high switching rate of 500 pulses per second
Keywords :
current transformers; driver circuits; high-frequency transformers; power convertors; power transistors; pulse generators; switching circuits; thyristor applications; 30 kV; 500 Hz; GTOs; current transformer; flux compensating circuit; gate turn-off thyristors; gate-drive system; high frequency-transformer; high voltage power switching circuit; large current signal mode; power convertors; power transistors; switching rate; trigger pulse generator; Current transformers; Frequency; Magnetic circuits; Magnetic flux; Oil insulation; Power transformer insulation; Pulse generation; Switching circuits; Thyristors; Voltage;
Conference_Titel :
Industry Applications Society Annual Meeting, 1993., Conference Record of the 1993 IEEE
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-1462-X
DOI :
10.1109/IAS.1993.299021
