Static current limiting switch with soft forced commutation

Details Static current limiting switch with soft forced commutation Static current limiting switch with soft forced commutation

1978-06-30

1979-11-13

Shoop, William M.

Electricity: power supply or regulation systems

Remote sensing

323 24, 361 58, H02H 700

Patent

active

041744950

ABSTRACT:
Disclosed is a force commutated static switch composed of inverse parallel connected thyristors. A bilateral commutation circuit is connected across the thyristors. The commutation circuit includes a switched capacitor which, during a current commutation interval, provides the dual functions of contributing to the current commutation operation and of acting as a current source for one of the thyristors. The capacitor discharge current interacts with the intrinsic resistance of the thyristor to provide a relatively low forward voltage drop which is a reverse voltage drop for the other thyristor. The low reverse voltage is known as soft biasing voltage. This voltage is utilized in conjunction with the most recently turned off thyristor to prevent reconduction thereof during the critical recovery time of the thyristor. The commutation circuit cooperates with its control circuit to provide an abort capability for its current limiting operation. Furthermore, the commutating circuit cooperates with its control circuit to eliminate repeated current reversals of the capacitor's discharge current.

REFERENCES:
patent: 3558983 (1971-01-01), Steen
patent: 3629613 (1971-12-01), Feige
patent: 3710230 (1973-01-01), Venard
patent: 3723816 (1973-03-01), Pollard
patent: 3725742 (1973-04-01), Pollard
patent: 3737759 (1973-06-01), Pollard
patent: 3890561 (1975-06-01), Demarest
patent: 3921038 (1975-11-01), Kernick et al.
patent: 4131927 (1978-12-01), Tsuchiya et al.

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