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Steady-State Analysis and Optimal Design of an LLC Resonant Converter Considering Internal Loss Resistance

Author

Listed:
  • Jeong-Sang Yoo

    (Department of Electronics Engineering, Cheongju University, Cheongju 28503, Korea)

  • Yong-Man Gil

    (Department of Electronics Engineering, Cheongju University, Cheongju 28503, Korea)

  • Tae-Young Ahn

    (Department of Electrical & Control Engineering, Cheongju University, Cheongju 28503, Korea)

Abstract

In this paper, a steady-state model of an LLC resonant half-bridge converter with internal loss resistance is proposed, in order to maximize power conversion efficiency, and steady-state characteristic equations of DC voltage gain and input impedance are derived for the optimal design of the converter. First, to confirm the validity of the steady-state characteristic equation and the optimal design process, a prototype converter with a maximum output of 2 kW was designed. Through comparison of simulation, calculation, and experimental results obtained from the prototype test, it is shown that the calculation results proposed in this paper were closer to the experimental results than the calculation results obtained under the lossless condition. In addition, the relationship between the switching frequency and the load current of the prototype was compared, in order to determine the operating range of the switching frequency, which is important in the converter design stage. In this case, it was confirmed that the calculated value reflecting the internal loss showed a close result. In conclusion, we confirm the usefulness of the analysis results reflecting the internal loss resistance proposed in this paper and the optimal design process.

Suggested Citation

  • Jeong-Sang Yoo & Yong-Man Gil & Tae-Young Ahn, 2022. "Steady-State Analysis and Optimal Design of an LLC Resonant Converter Considering Internal Loss Resistance," Energies, MDPI, vol. 15(21), pages 1-19, November.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:21:p:8144-:d:959775
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    Citations

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    Cited by:

    1. M. S. Priyadarshini & D. Krishna & Kurakula Vimala Kumar & K. Amaresh & B. Srikanth Goud & Mohit Bajaj & Torki Altameem & Walid El-Shafai & Mostafa M. Fouda, 2023. "Significance of Harmonic Filters by Computation of Short-Time Fourier Transform-Based Time–Frequency Representation of Supply Voltage," Energies, MDPI, vol. 16(5), pages 1-25, February.
    2. Josué Lara-Reyes & Mario Ponce-Silva & Leobardo Hernández-González & Susana E. DeLeón-Aldaco & Claudia Cortés-García & Jazmin Ramirez-Hernandez, 2022. "Series RLC Resonant Circuit Used as Frequency Multiplier," Energies, MDPI, vol. 15(24), pages 1-18, December.
    3. Songyan Niu & Qingyu Zhao & Haibiao Chen & Hang Yu & Shuangxia Niu & Linni Jian, 2022. "Underwater Wireless Charging System of Unmanned Surface Vehicles with High Power, Large Misalignment Tolerance and Light Weight: Analysis, Design and Optimization," Energies, MDPI, vol. 15(24), pages 1-19, December.
    4. Umut Ondin & Abdulkadir Balikci, 2023. "A Transformer Design for High-Voltage Application Using LLC Resonant Converter," Energies, MDPI, vol. 16(3), pages 1-26, January.
    5. Jeong-Sang Yoo & Yong-Man Gil & Tae-Young Ahn, 2022. "High-Power-Density DC–DC Converter Using a Fixed-Type Wireless Power Transmission Transformer with Ceramic Insulation Layer," Energies, MDPI, vol. 15(23), pages 1-19, November.

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