Multiple output converter with continuous power transfer to an o

Details Multiple output converter with continuous power transfer to an o Multiple output converter with continuous power transfer to an o

1994-11-23

1996-07-30

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 97, 363131, 323267, H02M 3335, G05F 1577

Patent

active

055418287

ABSTRACT:
A DC-DC converter, having multiple outputs, efficiently utilizes its power transformer to provide continuous power output to the outputs except during transitions of the power switches. Energy flow is continuous to one or more outputs during conduction of the power switch and then is transferred to the remaining outputs during its non-conduction. A feedback control, connected to sense only one of the outputs operate the power switch at a controlled duty cycle. Regulation of both outputs is enabled by equalizing transformer volt seconds of the non-conduction and conduction intervals of the power switch and by a clamping circuit which sustains the volt seconds in the power transformer during the non-conduction interval. In a particular embodiment, a converter circuit comprises a transformer having a primary winding and a secondary winding. An input is coupled to the primary winding, first and second switch devices are each coupled to the primary winding of the transformer, and a clamp capacitor is coupled to the transformer by at least one of the first and second switches. Portions of the secondary winding are coupled through separate rectifier devices and through separate output filter inductors to separate inputs. A single feedback circuit is coupled to one of the outputs and supplies drive signals to the first and second switches so as to cause the first and second switches to conduct current alternately.

REFERENCES:
patent: 4510564 (1985-04-01), Seer, Jr.
patent: 4660136 (1987-04-01), Montorefano
patent: 4999759 (1991-03-01), Cavagnolo et al.
patent: 5126931 (1992-06-01), Jitaru
patent: 5400239 (1995-03-01), Caine

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