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The self-driven synchronous rectification schemes for asymmetrical topologies have been studied in this paper. Some rules about the conduction of SRs body diode are found. Based on these rules, several ideal self-driven SR circuits without body diode conduction have been proposed. A laboratory prototype with one of the proposed ideal self-driven SR circuits is built up to verify the theoretical analysis...
A new ZVS cell is proposed based on the active clamping technique. With a small clamping diode in the cell the voltage ringing caused by the auxiliary inductor is eliminated, and the circulating loss is minimized. A new ZVS boost converter is presented and analyzed in detail to demonstrate the operation principle of the new ZVS cell. Utilizing this cell a new family of ZVS DC-DC converter can be constructed...
A new zero voltage switching (ZVS) boost converter is presented in this paper. By using an auxiliary switch and a capacitor, ZVS for all switches is achieved without any additional magnetic component. To eliminate the voltage ringing across the main rectifier diode a small diode is added. This clamping technique can also be utilized in other dc-dc converters. An experimental circuit (500 W/193 kHz)...
This paper proposes a novel zero-current-transition (ZCT) PWM full bridge DC/DC converter. The proposed converter not only achieves ZCS for the main switches and auxiliary switch in the entire load ranges but also realizes soft commutation for the output rectifier diodes. Furthermore, the auxiliary circuit also helps softly turn on the main switches. Simulation results and experimental results verify...
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