Parallel oscillatory circuit frequency converter with safety cir

Details Parallel oscillatory circuit frequency converter with safety cir Parallel oscillatory circuit frequency converter with safety cir

1988-08-03

1989-10-17

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 58, 363136, H02M 7515, H02H 700

Patent

active

048751502

ABSTRACT:
The invention relates to a parallel oscillatory circuit frequency converter comprising: a rectifier (1); an inverse rectifier (4) having thyristors disposed in a bridge circuit; a parallel oscillatory circuit (5) having an inductance (L) and a series connection of two capacitors (C, C.sub.K) whereby one capacitor (C) is connected to the load points of the bridge circuit; and a gate-controlled turn-off time control device (6) for the alternate firing (switching) of the thyristors a, b forming the particular diagonally adjacent bridge branches with a cycle frequency adapted to maintain a minimum turn-off time, a safety firing circuit (24, 25) controlled by a detector circuit (11-23) to detect incorrect switching delivering firing pulses without delay to all the thyristors at least until all the thyristors are current-carrying.

REFERENCES:
patent: 3611108 (1971-10-01), Susumu et al.
patent: 3852656 (1974-12-01), Bourbeau
patent: 4041365 (1977-08-01), Peak et al.
patent: 4506196 (1985-03-01), Bees

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