Self-oscillating resonant AC/DC converter topology for input power-factor correction

This paper presents the analysis and design of a single-phase single-stage high-power-factor ac/dc converter employing a series-parallel resonant topo logy operating in self-sustained oscillating mode. A control approach is pr oposed to achieve low total harmonic distortion of the input current. This approach does not require sensing of the input current. In addition, the in verter output current is limited during transients, and the converter opera tes with zero voltage switching for all operating conditions including open and short circuit, The performance of the proposed scheme is verified expe rimentally on a 500-W prototype.