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

HwaPyeong Park, Mina Kim, HakSun Kim and JeeHoon Jung
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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

Energies, 2019, vol. 12, issue 11, 1-20

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.

Keywords: resonant converter; dual output converter; pulse frequency modulation (PFM); asymmetric pulse width modulation (APWM) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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