Low cost high efficiency power converter

Details Low cost high efficiency power converter Low cost high efficiency power converter

1997-12-19

2000-01-25

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363131, H02M 3335

Patent

active

060184698

ABSTRACT:
A switch mode power converter achieving high efficiency through zero voltage switching (ZVS) by using an auxiliary switch, a capacitor, an auxiliary winding and an inductor. The technique can be applied to a boost, buck-boost, buck, isolated forward or isolated flyback converter. The auxiliary switch is turned on before the main power switch turns on, and the capacitor provides voltage to energize the inductor and force current to flow into the auxiliary winding. The current is transformed by the main winding and discharges the capacitance across main power switch to zero volts before the main switch turns on. Hence ZVS is obtained and can greatly reduce the switching loss of the main power switch.

REFERENCES:
patent: 4441146 (1984-04-01), Vinciarelli
patent: 4607322 (1986-08-01), Henderson
patent: 4912620 (1990-03-01), O''Dell
patent: 5066900 (1991-11-01), Bassett
patent: 5455757 (1995-10-01), Nguyen et al.

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