Cycloconverter apparatus with controllable end stop firing pulse

Details Cycloconverter apparatus with controllable end stop firing pulse Cycloconverter apparatus with controllable end stop firing pulse

1981-06-11

1983-06-28

Beha, Jr., William H.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

307252P, 363129, 363160, H02M 108

Patent

active

043909388

ABSTRACT:
In power conversion apparatus such as a naturally commutated cycloconverter for use in converting the output of a variable speed generator to a constant frequency, there is provided an end stop control circuit for ensuring commutation of power switching devices that includes timing wave generators for both rectification and inversion end stops. The timing wave generators are phase locked with the generator outputs but are controllable by end stop bias signal derived from a variable system parameter that may be independent of the source, such as load current to provide prompt protection against converter malfunctions due to excess load currents.
Further provided is an excess current detector employing, for each phase, a pair of high slew rate, high current unipolar output op amps connected in a voltage follower configuration with a common pull-up resistor and a common load capacitor to develop a peak current signal representing the greater of the positive and negative peaks of the alternating phase current.

REFERENCES:
patent: 3400321 (1968-09-01), Lafuze
patent: 3818315 (1974-06-01), Gyugyi et al.
patent: 4028609 (1977-06-01), Detering
patent: 4307444 (1981-12-01), Stacey et al.
Pelly, "Thyristor Phase-Controlled Converters and Cycloconverters,", Wiley-Interscience, 1971, pp. 259-271.
Gyugyi et al., Static Power Frequency Changers, Wiley Interscience, 1976, pp. 279-322.

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