High current, ultrasonic, G.T.O. thyristor cathode switch

J. K. Goodfellow, B. W. Williams

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Many applications require a high frequency power switch. A switched-mode amplifier for sonar and vibration test equipment will require a power switch with a modulation frequency of at least 50 kHz, while ultrasonic motor drives are desirable. This paper discusses a Gate Turn Off thyristor (GTO) and bipolar transistor (b.j.t) cascode switch with similar power ratings of 180 kVA operating on a 500 V to 700 V dc rail and with load currents of up to 300 A. The circuit was developed for the b.j.t. cascode or emitter switch operating at 150 kVA and 50 kHz and subsequently applied to the G.T.O. cascode or cathode switch. The paper shows the results achieved and compares the two types of switch.

Original languageEnglish
Pages (from-to)91-94
Number of pages4
JournalIEE Conference Publication
Issue number291
Publication statusPublished - 1988
EventThird International Conference on Power Electronics and Variable-Speed Drives - London, Engl
Duration: 13 Jul 198815 Jul 1988


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