A Novel Two-Stage AC-DC Power Converter with Partial Power Processing
Abstract
A two-stage power converter with an AC-DC boost converter and a soft-switched DC-DC full-bridge converter is proposed in this thesis. The first stage has two interleaved modules that perform power factor correction; the second stage converts the output of the first stage to the desired output. An auxiliary circuit with a switch, a small transformer, and passive components is used to turn off the AC-DC converter switches with soft-switching; the auxiliary switch can also be turned on and off softly. The secondary of the auxiliary transformer is connected to the output of the overall converter so that some power can be transferred from the front-end converter to the output. This power is processed only once, thus reducing conversion losses. The thesis explains the operation of the converter and presents steady-state analysis and a design procedure. Results obtained from an experimental prototype are presented to confirm the converter’s feasibility.