Abstract
The dual-frequency converter comprises a high-frequency buck unit and a low-frequency buck unit, which has the advantages of high efficiency and fast dynamic response. But also, the increase of magnetic parts leads to the power density of the converter being greatly reduced; for this problem, this paper proposes a three-section winding method to decouple the two inductors in the converter integrated into a magnetic core, given the integrated magnetic parts structure and establish its gyrator-capacitor model to derive the decoupling conditions. The flux density distribution of the magnetic components is analyzed by finite element simulation software and compared with the existing integration method; this decoupling integration method can make the flux distribution more uniform and improve the core utilization. The results show that the volume and weight are reduced by 31.2 % and 25.3 % compared with those of the separated magnetic parts, and the efficiency is also consistent with that of the separated magnetic parts, which verifies the correctness and feasibility of the theoretical analysis.
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