Phase-shifted PWM bridge with switchable inductors to...

Details Phase-shifted PWM bridge with switchable inductors to... Phase-shifted PWM bridge with switchable inductors to...

2008-01-29

2009-10-27

Riley, Shawn (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S098000, C363S132000

Reexamination Certificate

active

07609532

ABSTRACT:
A dc-to-dc pulse-width-modulated phase-shifted full bridge defines two taps, and the bridge switches are operated to produce alternating voltage between the taps. A switchable inductor is connected between each tap and a reference potential. The inductors are switched into circuit during low-load conditions to provide additional energy storage for zero-volt switching (ZVS) of the bridge switches. The switching of the inductors may be by mechanical, solid-state, optical, or magnetic switches. The magnetic switch may be a transformer winding. The switched inductor may be transformer-coupled.

REFERENCES:
patent: 4864479 (1989-09-01), Steigerwald et al.
patent: 5946200 (1999-08-01), Kim et al.
MWeene, “a 1kW 500 kHz Front-End Converter for a Distributed Power Supply System”, IEEE Transactions on Power Electroncis, vol. 6, No. 3, Jul. 1991.
U.S. Appl. No. 11/965,327 entitled “Phase-Shifted Ridge With Auxiliary Circuit to Maintain Zero-Voltage-Switching,” filed on Dec. 27, 2007 in the names of Michael J. Schutten and Robert L. Steigerwald, inventors.

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