A High-Efficiency Bi-Directional CLLLC Converter with Auxiliary LC Network for Fixed-Frequency Operation in V2G Systems

Tran Duc Hung, Zeeshan Waheed, Manh Tuan Tran and Woojin Choi ()
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Tran Duc Hung: School of Electrical Engineering, Soongsil University, Seoul 06978, Republic of Korea
Zeeshan Waheed: School of Electrical Engineering, Soongsil University, Seoul 06978, Republic of Korea
Manh Tuan Tran: School of Electrical Engineering, Soongsil University, Seoul 06978, Republic of Korea
Woojin Choi: School of Electrical Engineering, Soongsil University, Seoul 06978, Republic of Korea

Energies, 2025, vol. 18, issue 14, 1-24

Abstract: This paper introduces an enhanced bi-directional full-bridge resonant converter designed for Vehicle-to-Grid (V2G) systems. A key innovation lies in the incorporation of an auxiliary LC resonant circuit connected via a tertiary transformer winding. This circuit dynamically modifies the magnetizing inductance based on operating frequency, enabling soft-switching across all primary switches, specifically, Zero-Voltage Switching (ZVS) at turn-on and near Zero-Current Switching (ZCS) at turn-off across the entire load spectrum. Additionally, the converter supports both Constant Current (CC) and Constant Voltage (CV) charging modes at distinct, fixed operating frequencies, thus avoiding wide frequency variations. A 3.3 kW prototype developed for onboard electric vehicle charging applications demonstrates the effectiveness of the proposed topology. Experimental results confirm high efficiency in both charging and discharging operations, achieving up to 98.13% efficiency in charge mode and 98% in discharge mode.

Keywords: bi-directional converter; electric vehicle; soft-switching; high-frequency isolation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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