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A Bidirectional DHC-LT Resonant DC-DC Converter with Research on Improved Fundamental Harmonic Analysis Considering Phase Angle of Load Impedance

Author

Listed:
  • Shuhuai Zhang

    (Faculty of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
    These authors contributed equally to this work.)

  • Xuezhi Wu

    (Faculty of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
    These authors contributed equally to this work.)

  • Ziqian Zhang

    (Beijing Dynamic Power Co., Ltd., Beijing 100070, China
    These authors contributed equally to this work.)

  • Xuejiang Zhang

    (Beijing Dynamic Power Co., Ltd., Beijing 100070, China
    These authors contributed equally to this work.)

Abstract

This paper presents a novel 400 V–50 V bidirectional DHC-LT resonant DC-DC converter. By adding a resonant capacitor and an auxiliary transformer based on LLC, zero-voltage switching (ZVS) and zero-current switching (ZCS) are achieved, while the output voltage gain range is broadened in two directions. Operation principles and robustness are discussed with equations. Then, the error factor of fundamental harmonic analysis (FHA) in resonant converters is analyzed. Considering the phase difference between the output voltage and resonant tank current, an improved method is proposed to describe the behavior of the DHC-LT converter more precisely. A comparison is conducted to prove the effectiveness of the proposed FHA. Furthermore, in order to reduce the output voltage and provide a ripple-free charging current, a fixed-frequency phase-shift strategy is introduced in the DHC-LT converter. ZVS can be realized through the reasonable design of dead time and phase-shift angle. Finally, a 2.5 kW prototype of the DHC-LT resonant DC-DC converter with a digital signal processor (DSP) platform and a battery/PV DC test system is established in the lab to validate the theoretical analysis.

Suggested Citation

  • Shuhuai Zhang & Xuezhi Wu & Ziqian Zhang & Xuejiang Zhang, 2022. "A Bidirectional DHC-LT Resonant DC-DC Converter with Research on Improved Fundamental Harmonic Analysis Considering Phase Angle of Load Impedance," Energies, MDPI, vol. 15(14), pages 1-23, July.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:14:p:5281-:d:867925
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    References listed on IDEAS

    as
    1. Bing-Zhang Chen & Hsuan Liao & Linda Chen & Jiann-Fuh Chen, 2022. "Design and Implementation of the Bidirectional DC-DC Converter with Rapid Energy Conversion," Energies, MDPI, vol. 15(3), pages 1-19, January.
    2. Muhammad Faisal Fiaz & Sandro Calligaro & Mattia Iurich & Roberto Petrella, 2022. "Analytical Modeling and Control of Dual Active Bridge Converter Considering All Phase-Shifts," Energies, MDPI, vol. 15(8), pages 1-32, April.
    3. Eser Çalışkan & Ozgur Ustun, 2022. "Smart Efficiency Tracking for Novel Switch—LLC Converter for Battery Charging Applications," Energies, MDPI, vol. 15(5), pages 1-21, March.
    4. Michal Gierczynski & Lech M. Grzesiak & Arkadiusz Kaszewski, 2021. "Cascaded Voltage and Current Control for a Dual Active Bridge Converter with Current Filters," Energies, MDPI, vol. 14(19), pages 1-30, September.
    5. Shu-huai Zhang & Yi-feng Wang & Bo Chen & Fu-qiang Han & Qing-cui Wang, 2018. "Studies on a Hybrid Full-Bridge/Half-Bridge Bidirectional CLTC Multi-Resonant DC-DC Converter with a Digital Synchronous Rectification Strategy," Energies, MDPI, vol. 11(1), pages 1-22, January.
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