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Circuit Topology and Small Signal Modeling of Variable Duty Cycle Controlled Three-Level LLC Converter

Author

Listed:
  • Hussain Humaira

    (Department of Control and Instrumentation Engineering, Korea National University of Transportation, Chungju (KS001) 27469, Korea)

  • Seung-Woo Baek

    (Department of Control and Instrumentation Engineering, Korea National University of Transportation, Chungju (KS001) 27469, Korea)

  • Hag-Wone Kim

    (Department of Control and Instrumentation Engineering, Korea National University of Transportation, Chungju (KS001) 27469, Korea)

  • Kwan-Yuhl Cho

    (Department of Control and Instrumentation Engineering, Korea National University of Transportation, Chungju (KS001) 27469, Korea)

Abstract

With a view to regulate the output voltage with fixed frequency, without using any additional component or complex modulation technique, a topology of a variable duty controlled three-level LLC converter is proposed and an equivalent small signal model for Electric Vehicle (EV) charger applications is deduced in this paper. The steady state equations of each operating region are derived in time domain. Based on an Extended Describing Function (EDF) approach, a small signal equivalent circuit is modeled which includes both frequency and duty controlled terms. The equivalent circuit is further simplified to derive a transfer function of duty control to output voltage. The transfer function is verified through simulation software. Analyzing the transfer function, a voltage controller is designed and implemented with a PI compensator. The simulation results of the proposed control schemes are illustrated and discussed. The topology is compared to a conventional frequency control topology and the merits of the proposed topology are presented.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:20:p:3833-:d:275012
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    References listed on IDEAS

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    1. Kyriakopoulos, Grigorios L. & Arabatzis, Garyfallos & Tsialis, Panagiotis & Ioannou, Konstantinos, 2018. "Electricity consumption and RES plants in Greece: Typologies of regional units," Renewable Energy, Elsevier, vol. 127(C), pages 134-144.
    2. Sajib Chakraborty & Hai-Nam Vu & Mohammed Mahedi Hasan & Dai-Duong Tran & Mohamed El Baghdadi & Omar Hegazy, 2019. "DC-DC Converter Topologies for Electric Vehicles, Plug-in Hybrid Electric Vehicles and Fast Charging Stations: State of the Art and Future Trends," Energies, MDPI, vol. 12(8), pages 1-43, April.
    3. 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.
    4. Kyriakopoulos, Grigorios L. & Arabatzis, Garyfallos, 2016. "Electrical energy storage systems in electricity generation: Energy policies, innovative technologies, and regulatory regimes," Renewable and Sustainable Energy Reviews, Elsevier, vol. 56(C), pages 1044-1067.
    5. Arabatzis, Garyfallos & Kyriakopoulos, Grigorios & Tsialis, Panagiotis, 2017. "Typology of regional units based on RES plants: The case of Greece," Renewable and Sustainable Energy Reviews, Elsevier, vol. 78(C), pages 1424-1434.
    6. Zhijian Fang & Junhua Wang & Shanxu Duan & Jianwei Shao & Guozheng Hu, 2017. "Stability Analysis and Trigger Control of LLC Resonant Converter for a Wide Operational Range," Energies, MDPI, vol. 10(10), pages 1-21, September.
    7. Junhao Luo & Junhua Wang & Zhijian Fang & Jianwei Shao & Jiangui Li, 2018. "Optimal Design of a High Efficiency LLC Resonant Converter with a Narrow Frequency Range for Voltage Regulation," Energies, MDPI, vol. 11(5), pages 1-17, May.
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    Cited by:

    1. Chien-Chang Wu & Tsung-Lin Chen, 2020. "Design and Experiment of a Power Sharing Control Circuit for Parallel Fuel Cell Modules," Energies, MDPI, vol. 13(11), pages 1-23, June.

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