A High-Efficiency High-Density Wide-Bandgap Device-Based Bidirectional On-Board Charger

By Bin Li, Qiang Li, Fred C. Lee, Zhengyang Liu, Yuchen Yang. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2018

176 citations recorded by the source corpus.

This paper proposes a novel two-stage topology for a 6.6-kW on-board charger. The first stage, employing an interleaved bridgeless totem-pole ac/dc in critical conduction mode to realize zero-voltage switching, is operated at over 300 kHz. A bidirectional CLLC resonant converter operating at 500 kHz is chosen for the second stage. A variable dc-link voltage is adopted to track the wide battery voltage range, so that the CLLC resonant converter can always operate at its most efficient point. The 1.2-kV SiC devices are adopted for the ac/dc stage and the primary side of dc/dc stage, while 650-V GaN devices are used for the secondary side of dc/dc stage. In addition, PCB winding coupled inductors and integrated transformer are implemented in ac/dc stage and dc/dc stage, respectively, for the purpose of high density and manufacture automation. The proposed structure is demonstrated to have 37-W/in3 power density and above 96% efficiency over the entire battery voltage range, which far exceeds the current practice.

Subfields: Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/d26ccf7e34ffa70cb7f25d711a4813abfec2906f