High Efficient Hybrid Converter Using Center-tapped Clamp Circuit

In this paper, a hybrid converter combining a phase-shifted full-bridge converter and a resonant half-bridge converter with a new center-tapped clamp circuit is proposed to achieve high efficiency in electric vehicle battery charging systems. The proposed converter has the benefit of half-bridge integrated converters such as the extended zero-voltage-switching range. In addition, by using a new center-tapped clamp circuit, which consists of two diodes and two capacitors, the proposed converter can solve the drawbacks of conventional PSFB converters, such as the substantial circulating current and the severe voltage stress and the significant switching loss in the secondary full-bridge rectifier. With these advantages, the efficiency is considerably increased. In order to validate the feasibility of the proposed converter, a 3.3-kW prototype was tested.