A dual-asymmetric PWM control strategy for full bridge DC-DC converters

Abstract

This paper analyzes the dual-asymmetric PWM (DAPWM) control strategy for conventional DC-DC converters with a diode rectifier in the secondary side. The DAPWM has two degrees of freedom to control the transferring power, which can improve the performance of the converter than single-phase-shift (SPS) control strategy. Also it is easier to implement than the dual-phase-shift (DPS) and triple-phase-shift (TPS). The operating principles, waveforms in different modes and the expressions for power transfer are presented in detail in this paper. The theoretical analysis and calculation are validated through simulation and experimental test.