Analysis and Design of High-Efficiency Bidirectional GaN-Based CLLC Resonant Converter

Yuanjun Liu, Guiping Du, Xueyi Wang and Yanxiong Lei
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Yuanjun Liu: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China
Guiping Du: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China
Xueyi Wang: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China
Yanxiong Lei: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China

Energies, 2019, vol. 12, issue 20, 1-13

Abstract: A bidirectional CLLC resonant converter (CLLC-BRC) based on GaN transistors is analyzed and designed in this paper. Similar resonant topologies are listed and commented on, with the CLLC topology showing competitiveness in bidirectional energy transmission. The analysis of the aforementioned converter has been provided, including the reveal of resonant frequencies of the CLLC topology and an improved zero-voltage switching (ZVS) condition with operation principles of the reverse mode and relevant parasitic parameters taken into account. The design methodology of the aforementioned converter based on pulse frequency modulation (PFM) is further discussed in detail. A prototype with a rated power of 400 W and a maximal operating frequency that is larger than 0.5 MHz was built to verify the proposed design methodology. The highest conversion efficiency of the prototype was 97.02% in the forward mode, and it was 95.96% in the reverse mode.

Keywords: GaN transistors; bidirectional CLLC resonant converter; high efficiency (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
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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