Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1976-09-08
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
040866211
ABSTRACT:
A method of operating a cycloconverter which is adapted for use with a load in the form of a parallel resonant circuit and for use with an intermediate d-c link supplied by an a-c voltage source and including a smoothing choke and a controlled rectifier, the cycloconverter including an inverter circuit comprising a bridge circuit having output terminals adapted to be connected to the load and input terminals adapted to be connected to the d-c link, in which starting of the cycloconverter is realized by firing the thyristors of an auxiliary commutating device for a time interval sufficient to charge commutation capacitors to a predetermined voltage and the thyristors of the inverter then fired for a time interval sufficient to result in a current of predetermined magnitude, the latter being held constant by controlling the rectifier in the d-c link, and, thereupon, prior to each zero crossing of the resonant circuit voltage, first firing the thyristors of the auxiliary device followed, after a predetermined time interval, by the firing of the thyristors of the inverter and continuing this until the resonant circuit voltage reaches a value sufficient for direct commutation.
REFERENCES:
patent: 3582757 (1971-06-01), Achinger
patent: 3599078 (1971-08-01), Pelly
patent: 3757197 (1973-09-01), Bailey
Shoop William M.
Siemens Aktiengesellschaft
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