Abstract
Bidirectional CLLLC resonant dc-dc converters with an asymmetric tank can narrow the switching frequency bandwidth required to meet the asymmetric voltage gains in the two directions of power flow. Consequently, higher power density and efficiency may be feasible. in this paper, a CLLLC resonant converter with asymmetric primary and secondary capacitances is investigated for charging and discharging the next-generation 900 V traction battery of an electric vehicle. First, a new voltage gain equation is formulated using the First Harmonic Approximation. Then, the proposed gain equation is used to design the asymmetric resonant tank. the effects of asymmetric capacitances on the switching frequency bandwidth and capacitor sizing are investigated to predict the optimal ratio. Results are verified through simulations and experiments performed on the hardware prototype of the converter that uses a fully magnetically integrated transformer to meet the high-power density requirement in onboard electric vehicle chargers.
Recommended Citation
A. Sharma et al., "Bidirectional Asymmetric Clllc Resonant Dc-Dc Converter for Onboard Electric Vehicle Chargers," 2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023, pp. 2109 - 2116, Institute of Electrical and Electronics Engineers, Jan 2023.
The definitive version is available at https://doi.org/10.1109/ECCE53617.2023.10362332
Department(s)
Electrical and Computer Engineering
Keywords and Phrases
Asymmetric resonant tank; CLLLC resonant converter; electric vehicle; onboard charger; voltage gain equation
Document Type
Article - Conference proceedings
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2025 Institute of Electrical and Electronics Engineers, All rights reserved.
Publication Date
01 Jan 2023
Comments
Vehicle Technologies Office, Grant DE-EE0008449