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Design Methodology of Tightly Regulated Dual-Output LLC Resonant Converter Using PFM-APWM Hybrid Control Method

Author

Listed:
  • HwaPyeong Park

    (Ulsan National Institute of Science and Technology (UNIST), Ulsan KS017, Korea)

  • Mina Kim

    (Ulsan National Institute of Science and Technology (UNIST), Ulsan KS017, Korea)

  • HakSun Kim

    (Ulsan National Institute of Science and Technology (UNIST), Ulsan KS017, Korea)

  • JeeHoon Jung

    (Ulsan National Institute of Science and Technology (UNIST), Ulsan KS017, Korea)

Abstract

A dual-output LLC resonant converter using pulse frequency modulation (PFM) and asymmetrical pulse width modulation (APWM) can achieve tight output voltage regulation, high power density, and high cost-effectiveness. However, an improper resonant tank design cannot achieve tight cross regulation of the dual-output channels at the worst-case load conditions. In addition, proper magnetizing inductance is required to achieve zero voltage switching (ZVS) of the power MOSFETs in the LLC resonant converter. In this paper, voltage gain of modulation methods and steady state operations are analyzed to implement the hybrid control method. In addition, the operation of the hybrid control algorithm is analyzed to achieve tight cross regulation performance. From this analysis, the design methodology of the resonant tank and the magnetizing inductance are proposed to compensate the output error of both outputs and to achieve ZVS over the entire load range. The cross regulation performance is verified with simulation and experimental results using a 190 W prototype converter.

Suggested Citation

  • HwaPyeong Park & Mina Kim & HakSun Kim & JeeHoon Jung, 2019. "Design Methodology of Tightly Regulated Dual-Output LLC Resonant Converter Using PFM-APWM Hybrid Control Method," Energies, MDPI, vol. 12(11), pages 1-20, June.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:11:p:2146-:d:237263
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    References listed on IDEAS

    as
    1. Yu-Chen Liu & Chen Chen & Kai-De Chen & Yong-Long Syu & Meng-Chi Tsai, 2019. "High-Frequency LLC Resonant Converter with GaN Devices and Integrated Magnetics," Energies, MDPI, vol. 12(9), pages 1-19, May.
    2. Yeong-Jun Choi & Hwa-Rang Cha & Sang-Min Jung & Rae-Young Kim, 2018. "An Integrated Current-Voltage Compensator Design Method for Stable Constant Voltage and Current Source Operation of LLC Resonant Converters," Energies, MDPI, vol. 11(6), pages 1-18, May.
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