Small-signal and transient analysis of a zero-voltage-switched, phase-controlled PWM converter using averaged switch model

Abstract

An averaged switch model for a popular zero-voltage-switched (ZVS), phase-controlled PWM (PC-PWM) converter is developed. The model can be easily implemented in a circuit analysis program such as PSPICE to derive small-signal characteristics as well as predict large-signal transient behaviors of the converter in both continuous and discontinuous conduction modes. Using the averaged approach, the required computer time is greatly reduced. Such a model is vitally important for studying behavior of large systems such as parallel modules. A PSPICE subcircuit implementing the zero-voltage-switching PWM function is introduced. Simulation results illustrating both small and large-signal behaviors of the converter are presented.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>