Design of Interleaved Winding for Multilayer Planar Inductor and Its Application in Reducing Current Ringing of LLC Resonant Converter

Qichen Liu and Zhengquan Zhang ()
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Qichen Liu: School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 611756, China
Zhengquan Zhang: School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 611756, China

Energies, 2024, vol. 17, issue 7, 1-16

Abstract: To enhance the power density of LLC resonant converters, multilayer planar inductors are required. However, multilayer planar inductors have high parasitic capacitance, which may cause inductor current ringing in LLC resonant converters, leading to EMI problems. In this paper, it is found that by using interleaved winding inductors, compared with traditional winding inductors, the parasitic capacitance of multilayer planar inductors is reduced, which can reduce current ringing, without sacrificing power density and increasing manufacturing complexity. The method used to analyze current ringing is to establish an impedance model, and the parasitic capacitance of the interleaved winding inductors is verified by FEM simulations. The analysis is validated in an LLC resonant converter prototype.

Keywords: LLC resonant converter; planar inductor; parasitic capacitance; impedance model; current ringing (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: 2024
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