Patent ID: 7375994

Claim:
An AC-to-DC converter, comprising: an AC power input; a full bridge rectifier operative to receive AC voltage and current from the AC power input, and to convert the AC voltage and current to rectified voltage and current; a power factor correction (PFC) stage operative to receive the rectified voltage and current, and to provide power factor corrected voltage and current, wherein the PFC stage includes at least one first switching device operative to switch the rectified current in accordance with a zero current switching technique; a power conversion stage operative to receive the power factor corrected voltage and current, and to provide an isolated DC voltage output; the power conversion stage includes an isolation transformer having primary and secondary windings, and a plurality of second switching devices operatively coupled to the primary winding of the transformer, the plurality of second switching devices being operative to switch the power factor corrected current in accordance with a zero voltage switching technique; and a feedback control loop operative to provide error information from the DC voltage output to the PFC stage for controlling a duty cycle of the first switching device, thereby obtaining regulation of the isolated DC voltage output.