Novel compact synchronous rectifier with power factor correction

Sheppard-Taylor(S-T) topology was presented to reduce the output current ripple of DC-DC converters. In this paper, we modified the S-T circuit into AC-DC converter with functions of synchronous rectifier (SR) and power factor correction (PFC). Firstly, we made a comparison between several topologies to show the advantages of AC-DC S-T circuit for our design aim. Then we built up the math model of this AC-DC converter according to the state-space average and the power balance to calculate the equipment parameters and design the control circuit, which were different with DC-DC model. And we corrected the circuit by the computer simulation in details. Finally, a prototype of AC-DC Sheppard-Taylor circuit with 110 V input and 1.5 V/30 A output was completed and actually worked with the expectant aims. So we conclude that the converter can achieve high power factors, low voltage/high current output, high efficiency and compact with few electric components by proper design. We also emphasize some committed steps for the AC-DC S-T converter design in the paper