Modified Phase-Shift Scheme for Optimal Transient Response of Dual-Active-Bridge DC/DC Converters Considering the Resistive Impact

Abstract

The scattered resistive elements residing in a dual-active-bridge (DAB) dc/dc converter can adversely affect its transient performance especially when the load change is large. Conventional phase-shift methods do not take the resistive impact into account in their modeling and analysis. In this paper, a comprehensive analysis of the detrimental influence on the transient performance of a DAB converter due to resistive elements is presented, based on which a modified phase-shift scheme is proposed to further optimize the transient response of the converter. A DAB prototype is designed to verify the resistive impact discussed and validate the proposed phase-shift scheme. The experimental results confirm that better transient response can be effectively achieved with the proposal.

Keywords

• Current bias
• dual-active-bridge (DAB)
• hard switching
• phase-shift
• single-phase-shift (SPS)
• transient response