Circuit for reducing losses at light load in a soft...

Details Circuit for reducing losses at light load in a soft... Circuit for reducing losses at light load in a soft...

2007-04-24

2007-04-24

Sterrett, Jeffrey (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S132000

Reexamination Certificate

active

10912808

ABSTRACT:
A circuit for reducing power loss for a soft switching full bridge converter at light loads and enabling very high frequency operation without using a cold plate approach. The circuit preferably includes a resonant inductor and blocking inductor on the converter's primary side arranged so as to provide reduced losses for a zero voltage switching bridge converter. The circuit provides these benefits even for converters having a power transformer with very low leakage inductance. The circuit is not dependent on the presence of a high leakage inductance for the power transformer. The circuit can also be used in soft switching half bridge converters. The circuit can also be used in a hard switching full bridge or half bridge converter for achieving zero voltage switching at reduced cost with reduced losses at light load, if the duty cycle of the converter is set near fifty percent.

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patent: 7136294 (2006-11-01), Phadke et al.

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