with High-Frequency Isolation

In this paper, a new series resonant ac-to-dc recti- fier with high-frequency isolation is introduced. The proposed approach employs a PWM controlled ac controller, a series resonant tank and a high-frequency isolation transformer. With this approach, the single phase input ac is directly processed via the ac-to-ac converter eliminating the ac-to-dc rectification stage present in the conventional system. The output of the HF transformer is rectified and processed via a filtering stage to obtain a dc output. With the addition of an input filter, the input current is near sinusoidal at unity power factor. Simu- lation and experiment results are presented to verify the basic concept.