DC-DC Resonant converters with APWM control

Abstract

An asymmetrical pulse width modulated (APWM) dc-dc converters operating at constant frequency was simulated using Pspice software package. This converter incorporates constant frequency operation in a basic soft switching half bridge topology without any additional component and complexity. In this paper operation of converter configuration with capacitive filter in the output is discussed. A 5V, 50W converter was designed, fabricated using MOSFET and then tested to verify the characteristic of the converter. Due to asymmetrical duty ratio and zero voltage switching (ZVS) operation, this converter has low device voltage and current stresses wit no increase in conductively loss. This topology combines the best features of resonant (zero switching loss) and switched mode (low conduction loss) circuits.