Application of axisymmetric modelling to integrated LCT structure of series‐resonant converter

Abstract

AbstractThe aim of this paper is to present a low‐cost solution for low‐power applications. A high‐frequency AC to DC converter respecting the EN 61000‐3‐2 standard and suitable for application in the power range of 300 W is presented. Its topology is based on a full‐bridge series‐resonant converter that operates below half the resonant frequency. The converter features zero‐current for both turn‐on and turn‐off and reduces the switching current for the output rectifier. These advantages make the series‐resonant topology suitable for operation at high frequency. A method for the design of an integrated LCT structure (Inductor–Capacitor–Transformer) is presented. Also, results of the application of a newly developed FEA (Finite Elements Analysis) formulation for the constructed LCT prototype are presented. It is shown that the necessary capacitance can be achieved by using a bifilar primary and the leakage inductance of the transformer replaces the physical inductor. Finally, two PFC (Power Factor Correction) series‐resonant converters, using integrated and discrete LCT, were built, tested and compared. Copyright © 2004 John Wiley & Sons, Ltd.