Single stage true bridgeless AC/DC power factor corrected converter

This paper describes an isolated single stage converter AC/DC Power Factor Corrected (PFC) converter in two realizations. One is with a full bridge rectifier at its input and the other is a True Bridgeless version. The converter is derived from a topology known as the Davidson Converter that was invented and patented by the author in the early 80s'. This converter topology has very interesting properties that allows creation of efficient single stage isolated PFC converters. Being a boost derived converter it can operate very similarly to a traditional non-isolated PFC boost stage. Also it can accept either polarity of input depending upon the polarity of the primary side switching devices and creates a unipolar output, potentially allowing it to operate as a true bridgeless AC/DC converter. The operation of the converters is examined by Virtual Prototyping using PSIM simulation. A discussion on other considerations for achieving a reliable design with the proposed converters is also given.