Author(s)

Yisheng Yuan, Qunfang Wu

School of Electrical and Electronics Engineering, East China Jiaotong University, Nanchang, China.

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.

Push Pull Converter; Extra Transistor; Zero-voltage-switching

Y. Yuan and Q. Wu, "A New Zero-Voltage-Switching Push-Pull Converter," Energy and Power Engineering, Vol. 5 No. 4B, 2013, pp. 125-131. doi: 10.4236/epe.2013.54B024.