Firing Circuits for Series-Connected Thyristors.

摘要

1,165,049. Converters. WESTINGHOUSE ELECTRIC CORP. 27 Nov., 1967 [19 Dec., 1966], No. 53746/67. Heading H2F. [Also in Division H3] A triggaring circuit for a thyristor comprises a F.M. transmitter (not shown) and an F.M. receiver. The receiver comprises a demodulator 49, 51 and the resulting demodulated output pulse is shaped and then fed to a thyristor 58 which triggers two main thyristors 32, 34 (e.g. in a polyphase converter). A protection circuit comprising capacitors 68, 62 will also fire the thryistors in the event of any excess voltage which would otherwise cause anodecathode breakdown. The arrangement is employed for thyristors operating at a high voltage, and as described with reference to Fig. 1 (not shown). The thyristors are immersed in oil, and the transmitting transducer (18) and the receiving transducer 26 are mounted in a tube containing a dielectric gas.