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A novel soft-switched AC boost converter with an active snubber is proposed and analyzed. It has a bidirectional active power transfer capability, from low voltage to high voltage or reverse. The energy of switch capacitors is retrieved and delivered to the high voltage side. The snubber provides zero voltage switching (ZVS) for all the main switches in all input voltage and current polarities. The...
This paper presents a new design of auxiliary circuit branches for a family of zero-voltage switching phase-shift-modulated dc/dc converters initially reported for fuel cell application. The suggested method applies saturable inductors in auxiliary branches and guarantees zero-voltage switching (ZVS) operation with reduced conduction loss for all the input and load conditions. The suggested approach...
A study of AC-DC zero-voltage switched (ZVS) pulsewidth modulated (PWM) boost converters with silicon carbide (SiC) boost diodes instead of silicon (Si) boost diodes is presented in the paper. The paper reviews the general principles of active auxiliary circuits that are used to help the main boost power switch turn on with ZVS, then explains how these circuits operate differently when SiC boost diodes...
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