Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1982-02-09
1984-04-03
Wong, Peter S.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363 68, 361 82, 361 84, H02H 7125
Patent
active
044411480
ABSTRACT:
A power converting device including at least one power converting element, and a protection circuit monitoring the switching characteristics of the power converting element and for protecting the power converting element during switching thereof, including a first circuit coupled to detect a reverse voltage applied to the power converting element, a second circuit coupled to the first circuit for receiving the detected reverse voltage and for integrating the detected reverse voltage to produce a reverse voltage/time integral signal, and a third circuit coupled to receive the reverse voltage/time integral signal for producing a decision signal only when the amplitude of the reverse voltage/time integral signal exceeds a first prescribed value, the decision signal indicates that the power converting element is extinguished.
REFERENCES:
patent: 4112286 (1978-09-01), Alderman et al.
patent: 4313156 (1982-01-01), Kobayashi et al.
patent: 4319318 (1982-03-01), Rippel et al.
patent: 4320445 (1982-03-01), Kobayashi et al.
patent: 4325114 (1982-04-01), Kobayashi et al.
Tokyo Shibaura Denki Kabushiki Kaisha
Wong Peter S.
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