Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1987-01-23
1988-05-17
Beha, Jr, William H.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
315205, 315226, 331113A, 362219, 363 56, 363132, H02M 5458, H02M 75387
Patent
active
047455373
ABSTRACT:
A converter of electric power at a first value of voltage and frequency produces a voltage at a second value and at a higher value of frequency by means of an inverter oscillator circuit having two serially connected transistors. An output power transformer is coupled to the transistors for receiving current excitation from alternate ones of the transistors during alternate half-cycles of the output voltage. Incoming voltage is converted by a diode bridge circuit to a DC voltage which drives the transistors. Serially connected capacitors bypass the bridge circuit to couple high frequency current from a primary winding of the transformer through the transistors. Additional windings of the transformer are coupled in the base-emitter circuit of each transistor for inducing states of saturation during conduction phases of each transistor so as to minimize power dissipation within each of the transistors. The transformer has a saturating reactor core which is made to saturate at the end of each half cycle of the output current, the intervals of current saturation resulting in a flux change which reverses the polarities of the windings in the base emitter circuits to alternate the states of conduction of the transistors.
REFERENCES:
patent: 3175167 (1965-03-01), Lloyd
patent: 3317856 (1967-05-01), Wilkinson
patent: 3593060 (1971-07-01), Kryder
patent: 4104715 (1978-08-01), Lawson
patent: 4506318 (1985-03-01), Nilssen
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