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.
|Number of pages||4|
|Journal||IEE Conference Publication|
|Publication status||Published - 1988|
|Event||Third International Conference on Power Electronics and Variable-Speed Drives - London, Engl|
Duration: 13 Jul 1988 → 15 Jul 1988