Abstract

Dual-active-bridge (DAB) circuit is an excellent candidate for a high-efficiency, high-power-density and bidirectional electric vehicle charger. Unlike other circuits employing resonant inductors and capacitors, DAB minimizes the usage of passive components. The challenge, however, lies in difficulty of securing zero voltage switching (ZVS) at light-to-medium load. This is utmost important not only to the efficiency but also eliminating the bridge-switch crosstalk during the hard switching-on thereby enhancing the system reliability. Systematically integrating SPS, dual-phase-shift (DPS) and triple-phase-shift (TPS) to secure full-load-range ZVS in EV chargers has not been seen and is the focus of this paper. This paper plots the ZVS boundary for the full-load range, categorizes all operations into eight modes and proposes a smooth transition among SPS, DPS and TPS for a 20kW EV battery charger. Experimental results on a SiC-based charger validated its effectiveness and the smooth transition for the output voltage of 200~450VDC and 0~20kW.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.