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

Jeong-Sang Yoo (), Yong-Man Gil and Tae-Young Ahn
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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

Energies, 2022, vol. 15, issue 21, 1-19

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.

Keywords: LLC resonant converter; steady-state analysis; internal power losses; AC equivalent circuit; internal resistance; DC voltage gain (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: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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