Zero-Voltage-Switching Realized by Magnetizing Current of Transformer in Push-Pull DC-DC Converter

Masahito SHOYAMA  Koosuke HARADA  

IEICE TRANSACTIONS on Communications   Vol.E75-B   No.11   pp.1171-1178
Publication Date: 1992/11/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Telecommunications Energy Systems and Switching Power Converters)
ZVS-PWM converter,  synchronous rectifier,  constant switching frequency control,  

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This paper presents a new type of zero-voltage-switched (ZVS) push-pull dc-dc converter with two synchronous rectifiers in the secondary circuit. ZVS is realized using the magnetizing current of the transformer as a constant current source during the commutation. The output voltage is controlled by PWM with a constant switching frequency. The circuit operation is described using equivalent circuits. The steady-state and dynamic characteristics are analyzed and confirmed experimentally.