A novel full-bridge DC-DC converter for battery charging using secondary-side control combines soft switching over the full load range and low magnetics requirement

A novel full-bridge de-de configuration with a tapped transformer and secon dary-side control is proposed. It achieves zero-voltage switching for the p rimary side switches and zero-current switching for the secondary-side swit ches, under all operating conditions. The conduction losses are significant ly lower than those in the conventional soft-switching de-de converters. Du e to superior filter waveforms, the filter requirements, both at the input and at the output, are significantly reduced, The features of the proposed converter are compared with those of the conventional phase-modulated full- bridge de-de converters. The proposed configuration is ideally suited for t he de-de stage of high-power battery-charging applications with a power-fac tor-corrected preregulator, Analytical and experimental results on a 500-W/ 100-kHz prototype are presented.