A bridgeless half-bridge ac-dc converter with seriesconnected
two transformers has been proposed in this paper.
Operation principle, analysis, circuit design, and efficiency
comparison have been presented in detail. A 250 W prototype
of the ac-dc converter has been designed and tested to evaluate
its performance for intput voltage (60 Hz / 220 Vac). The
proposed converter achieves an efficiency of 93.5 % at 250 W
output power and compared to the previous converter in [6] by
increasing a efficiency.