Frequency converter and method of operating same

Details Frequency converter and method of operating same Frequency converter and method of operating same

1976-09-09

1978-04-25

Shoop, William M.

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

363 49, 363136, H02M 545

Patent

active

040866220

ABSTRACT:
A parallel resonant circuit frequency converter having input terminals of its inverter bridged by an auxiliary commutating arrangement which consists of a bridge circuit of thyristors, the a-c outputs of which are connected to a capacitor in which thyristors of the auxiliary commutating arrangement are fired until a predetermined capacitor voltage is reached to start up the frequency converter, the thyristors of the inverter then fired until a current of predetermined magnitude flows, which is kept contant by control of the rectifier, and subsequently, the thyristors of the auxiliary commutating arrangement are fired prior to each zero crossing of the resonant circuit voltage and, the thyristors of the inverter, delayed by a constant time span, are fired until the resonant circuit voltage has reached a predetermined value.

REFERENCES:
patent: 3219905 (1965-11-01), Davis et al.
patent: 3657634 (1972-04-01), Eastop
patent: 3757197 (1973-09-01), Bailey
patent: 3872364 (1975-03-01), Hubner
patent: 3947748 (1976-03-01), Klein

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