TITLE:
A New Zero-Voltage-Switching Push-Pull Converter
AUTHORS:
Yisheng Yuan, Qunfang Wu
KEYWORDS:
Push Pull Converter; Extra Transistor; Zero-voltage-switching
JOURNAL NAME:
Energy and Power Engineering,
Vol.5 No.4B,
October
14,
2013
ABSTRACT: A soft switching three-transistor push-pull（TTPP）converter is proposed in this paper. The 3rd transistor is inserted in the primary side of a traditional push-pull converter. Two primitive transistors can achieve zero-voltage-switching (ZVS) easily under a wide load range, the 3rd transistor can also realize zero-voltage-switching assisted by leakage inductance. The rated voltage of the 3rd transistor is half of that of the main transistors. The operation theory is explained in detail. The soft-switching realization conditions are derived. An 800 W with 83.3 kHz switching frequency prototype has been built. The experimental result is provided to verify the analysis.