Efficient Small-Signal Algorithm for High Dynamic Phase-Shifted Full-Bridge Converters

Abstract

Nowadays, the virtual development of high-dynamic automotive power systems faces major challenges. Automotive power systems exhibit particularly fast-changing dynamics. The load of power electronic supplies highly fluctuates and therefore needs to be considered during virtual pre-conception and system design. This paper introduces an algorithm being able to efficiently replicate dynamics of a phase-shifted full-bridge converter through iteratively calculating diode conducting times and corresponding state-space systems. The proposed converter model includes an additional voltage source representing the dynamics of the converter for different load-dependent deadtime behaviors. The additional voltage is calculated on basis of predicting the leakage current throughout one switching cycle. The algorithm reduces computation time by 91% compared to the switched model.