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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Tran Duc Hung & Zeeshan Waheed & Manh Tuan Tran & Woojin Choi, 2025. "A High-Efficiency Bi-Directional CLLLC Converter with Auxiliary LC Network for Fixed-Frequency Operation in V2G Systems," Energies, MDPI, vol. 18(14), pages 1-24, July.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:14:p:3815-:d:1704034
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