DC-to-AC voltage converter having galvanically separate input an

Details DC-to-AC voltage converter having galvanically separate input an DC-to-AC voltage converter having galvanically separate input an

1990-03-14

1991-05-28

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 97, 323289, 307280, 307300, H02M 7537

Patent

active

050199552

ABSTRACT:
A DC-to-AC voltage converter having galvanically separate onput and output circuits, and comprising a converter transformer having at least one primary winding; a resonance capacitor connected to said at least one primary winding; a switching transistor, of which the collector-emitter path is series-connected to the at least one primary winding; and drive means for the switching transistor, wherein charge storage in the base-collector area of the switching transistor provides base drive for the switching transistor, and further comprising control means for detecting an increase of the collector-emitter voltage (Uce) of the switching transistor and for providing in response to such an increase and at least in a period of time directly following the increase, an additional base drive current for the switching transistor, which additional base drive current is gradually increased at a predetermined rate in such a manner that the storage time of the switching transistor remains substantially constant over the operating range of the converter.

REFERENCES:
patent: 4063307 (1977-12-01), Stephens
patent: 4104714 (1978-08-01), Smith et al.
patent: 4228493 (1980-10-01), de Sartre et al.
patent: 4236187 (1980-11-01), Mochizuki et al.
patent: 4318011 (1982-03-01), Zeis
patent: 4566060 (1986-01-01), Hoeksma
patent: 4595974 (1986-06-01), Lethellier
RCA Designer's Handbook, Solid-State Power Circuits, 1971, p. 180-181.
Effects of Power Train, etc.; J. McArdle, T. Wilson, Jr. and R. Wong, 1/1/87, pp. 2-19.
Patent Abstracts of Japan, K. Kadofuju, 11/7/88; p. 96.

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