Analysis and design of a half-bridge parallel resonant converter

Abstract

A half-bridge parallel resonant converter (PRC) is analyzed in detail for both continuous conduction mode and discontinuous conduction mode operations in order to provide a more straightforward and easy-to-use design tools. Closed form solutions are derived for the PRC operating under steady state conditions. Theoretical results obtained are presented in the form of normalized design graphs. They could directly be utilized in designing a half-bridge PRC, having up to 2:1 input voltage variation. And they do not necessitate converting the obtained ratings, depending on the input voltage and load variations, in order to check the worst case values. A design example of a 500kHz 150W off-line switching power supply is given for both modes of operations, and it is implemented to verify experimentally.