Electric power conversion systems – Current conversion – Using semiconductor-type converter
Reexamination Certificate
2011-01-11
2011-01-11
Patel, Rajnikant B (Department: 2838)
Electric power conversion systems
Current conversion
Using semiconductor-type converter
C363S017000, C363S098000
Reexamination Certificate
active
07869237
ABSTRACT:
A phase-shifted PWM dc-to-dc converter includes a pair of switched half-bridges defining taps. The primary of an output transformer is coupled across the taps to receive AC, and produces transformed AC which is rectified and filtered to produce the output dc. Zero-voltage-switching (ZVS) is maintained over the full range from zero load current to maximum load current by the use of an auxiliary circuit including an “inverting” second transformer having primary and secondary windings serially coupled with capacitors. The primary-capacitor serial circuit is connected between a first half-bridge tap and reference potential, and the secondary-capacitor serial circuit is connected by an inductance between second half-bridge tap and a reference potential.
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Schutten Michael J.
Steigerwald Robert Louis
Duane Morris LLP
Lockheed Martin Corporation
Patel Rajnikant B
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