Hybrid Magnetic Core for Downsizing the Inductor in LLC Converter

Abstract

In this paper, a compact hybrid material magnetic core is proposed to design a resonant inductor for a 72V, 1.1kW, and 150kHz resonant converter. Nanocrystalline and ferrite magnetic materials are used to develop the proposed hybrid material magnetic core. The finite element analysis (FEA) is implemented for both the hybrid magnetic core and the counterparts in this manuscript. Ansys maxwell is used to validate the performance of the proposed magnetic core. The FEA results show that there is more than a 60% reduction in gross volume compared to nanocrystalline magnetic core and a 15% reduction in net volume compared to ferrite magnetic core. The hybrid core has a decrease of 83.95% eddy current loss compared to the nanocrystalline core and 30.61 % eddy current loss compared to the ferrite core.