Method and apparatus for starting a parallel-tuned current fed i

Details Method and apparatus for starting a parallel-tuned current fed i Method and apparatus for starting a parallel-tuned current fed i

1982-03-18

1984-02-07

Shoop, William M.

Electric power conversion systems

Current conversion

With starting arrangement

219 1075, H02M 5458

Patent

active

044306970

ABSTRACT:
A high frequency current-fed inverter of the series/parallel compensated type is started directly with the main thyristors of the inverter by charging the series capacitor through the input inductor of the DC supply during a first time interval with one pole, by discharging the same during a second time interval with the other pole, then passing to free-running operation at an initial frequency from which load operation can begin. The first and second time intervals are established while a constant DC voltage is being applied so that commutation of the outgoing thyristor is insured. DC voltage regulation is eliminated as soon as the free-running operation has been initiated.

REFERENCES:
patent: 3506907 (1970-04-01), Porterfield et al.
patent: 3599078 (1971-08-01), Pelly et al.
patent: 3757197 (1973-09-01), Bailey
patent: 4086622 (1978-04-01), Vukasovic
Knapp; P., "Characteristics of the Parallel-Resonance Inverter for Inductive Melting," Brown-Boveri Review, Oct. 1966.

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