Device having thyristors connected in series

Details Device having thyristors connected in series Device having thyristors connected in series

1983-05-06

1985-09-10

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

363 57, H03K 1772

Patent

active

045408955

ABSTRACT:
A device comprising a series circuit consisting of a plurality of thyristors connected in series, and a reverse-blocking semiconductor element such as a diode connected in an antiparallel relationship to the series circuit. The device further includes means for detecting whether a sufficient turn-off time is secured for each of the thyristors anterior or posterior to a reference moment at the zero point of a current flowing in the diode, and means for turning on the entirety of the thyristors when the sufficient turn-off time is not secured. Since none of the thyristors is turned off in the state where the turn-off time is insufficient, it becomes possible with certainty to achieve exact prevention of a fault that one or more thyristors, turned off earlier than others are led to breakdown by an overvoltage.

REFERENCES:
patent: 3715606 (1973-02-01), Travin et al.
patent: 3865438 (1975-02-01), Boksjo et al.
patent: 4016391 (1977-04-01), Kiuchi et al.
patent: 4377835 (1983-03-01), Asplund et al.

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