Proportional transistor base drive circuit for use in power conv

Details Proportional transistor base drive circuit for use in power conv Proportional transistor base drive circuit for use in power conv

1986-06-26

1987-09-15

Wong, Peter S.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

363 98, 336183, 336170, H02M 75387

Patent

active

046943897

ABSTRACT:
A transformer for use in a power converter includes first and second primary windings tightly coupled to a first secondary winding, and third and fourth primary windings tightly coupled to a second secondary winding. Of importance, the first and second primary windings are only loosely coupled to the third and fourth primary windings. In one embodiment of the invention, the transformer includes a plurality of legs. The first and second primary windings and the first secondry winding are wound around one half of one of the legs but not a secnd half of the one leg. The third and fourth primary windings and the second secondary winding are wound around the second half of the one leg but not the first half. In another embodiment of the invention, the transformer includes a U core. The first and second primary windings and the first secondary winding are wound around a first leg of the U core while the third and fourth primary windings and the second secondary winding are wound around a second leg of the U core.

REFERENCES:
patent: 3195089 (1965-07-01), Sievers et al.
patent: 3259863 (1966-07-01), Russell
patent: 3818314 (1974-06-01), Bishop et al.
patent: 3851278 (1974-11-01), Isono
patent: 4007413 (1977-02-01), Fisher et al.
patent: 4339792 (1982-07-01), Yasumura et al.

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