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Optimal Design of a High Efficiency LLC Resonant Converter with a Narrow Frequency Range for Voltage Regulation

Author

Listed:
  • Junhao Luo

    (School of Electrical Engineering, Wuhan University, Wuhan 430072, China)

  • Junhua Wang

    (School of Electrical Engineering, Wuhan University, Wuhan 430072, China)

  • Zhijian Fang

    (School of Electrical Engineering, Wuhan University, Wuhan 430072, China)

  • Jianwei Shao

    (School of Electrical Engineering, Wuhan University, Wuhan 430072, China)

  • Jiangui Li

    (School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China)

Abstract

As a key factor in the design of a voltage-adjustable LLC resonant converter, frequency regulation range is very important to the optimization of magnetic components and efficiency improvement. This paper presents a novel optimal design method for LLC resonant converters, which can narrow the frequency variation range and ensure high efficiency under the premise of a required gain achievement. A simplified gain model was utilized to simplify the calculation and the expected efficiency was initially set as 96.5%. The restricted area of parameter optimization design can be obtained by taking the intersection of the gain requirement, the efficiency requirement, and three restrictions of ZVS (Zero Voltage Switch). The proposed method was verified by simulation and experiments of a 150 W prototype. The results show that the proposed method can achieve ZVS from full-load to no-load conditions and can reach 1.6 times the normalized voltage gain in the frequency variation range of 18 kHz with a peak efficiency of up to 96.3%. Moreover, the expected efficiency is adjustable, which means a converter with a higher efficiency can be designed. The proposed method can also be used for the design of large-power LLC resonant converters to obtain a wide output voltage range and higher efficiency.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:5:p:1124-:d:144221
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    Citations

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    Cited by:

    1. Sang Gab Park & Byoung Kuk Lee & Jong Soo Kim, 2020. "Optimal Design of Multi-Output LLC Resonant Converter with Independently Regulated Synchronous Single-Switched Power-Regulator," Energies, MDPI, vol. 13(17), pages 1-17, August.
    2. 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.
    3. 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.
    4. Jacopo Carlo Alberizzi & Massimiliano Renzi & Maurizio Righetti & Giuseppe Roberto Pisaturo & Mosè Rossi, 2019. "Speed and Pressure Controls of Pumps-as-Turbines Installed in Branch of Water-Distribution Network Subjected to Highly Variable Flow Rates," Energies, MDPI, vol. 12(24), pages 1-18, December.
    5. 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.

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