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A High-Frequency Isolation (HFI) Charging DC Port Combining a Front-End Three-Level Converter with a Back-End LLC Resonant Converter

Author

Listed:
  • Guowei Cai

    (School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China)

  • Duolun Liu

    (School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China)

  • Chuang Liu

    (School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China)

  • Wei Li

    (School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China)

  • Jiajun Sun

    (School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China)

Abstract

The high-frequency isolation (HFI) charging DC port can serve as the interface between unipolar/bipolar DC buses and electric vehicles (EVs) through the two-power-stage system structure that combines the front-end three-level converter with the back-end logical link control (LLC) resonant converter. The DC output voltage can be maintained within the desired voltage range by the front-end converter. The electrical isolation can be realized by the back-end LLC converter, which has the bus converter function. According to the three-level topology, the low-voltage rating power devices can be adapted for half-voltage stress of the total DC grid, and the PWM phase-shift control can double the equivalent switching frequency to greatly reduce the filter volume. LLC resonant converters have advance characteristics of inverter-side zero-voltage-switching (ZVS) and rectifier-side zero-current switching (ZCS). In particular, it can achieve better performance under quasi-resonant frequency mode. Additionally, the magnetizing current can be modified following different DC output voltages, which have the self-adaptation ZVS condition for decreasing the circulating current. Here, the principles of the proposed topology are analyzed in detail, and the design conditions of the three-level output filter and high-frequency isolation transformer are explored. Finally, a 20 kW prototype with the 760 V input and 200–500 V output are designed and tested. The experimental results are demonstrated to verify the validity and performance of this charging DC port system structure.

Suggested Citation

  • Guowei Cai & Duolun Liu & Chuang Liu & Wei Li & Jiajun Sun, 2017. "A High-Frequency Isolation (HFI) Charging DC Port Combining a Front-End Three-Level Converter with a Back-End LLC Resonant Converter," Energies, MDPI, vol. 10(10), pages 1-23, September.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:10:p:1462-:d:112851
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    Citations

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    Cited by:

    1. 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.
    2. Chun-Yu Liu & Yi-Hua Liu & Shun-Chung Wang & Zong-Zhen Yang & Song-Pei Ye, 2021. "An Adaptive Synchronous Rectification Driving Strategy for Bidirectional Full-Bridge LLC Resonant Converter," Energies, MDPI, vol. 14(8), pages 1-16, April.
    3. Alberto M. Pernía & Juan Díaz-González & Miguel J. Prieto & José A. Fernández-Rubiera & Manés Fernández-Cabanas & Fernando Nuño-García, 2018. "Li-Po Battery Charger Based on the Constant Current/Voltage Parallel Resonant Converter Operating in ZVS," Energies, MDPI, vol. 11(4), pages 1-12, April.
    4. Hussain Humaira & Seung-Woo Baek & Hag-Wone Kim & Kwan-Yuhl Cho, 2019. "Circuit Topology and Small Signal Modeling of Variable Duty Cycle Controlled Three-Level LLC Converter," Energies, MDPI, vol. 12(20), pages 1-21, October.

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