4.8 Article

Core Energy Capacitance of NiZn Inductors

期刊

IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 38, 期 4, 页码 4235-4240

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2022.3232477

关键词

Capacitance; Analytical models; Inductors; Magnetic cores; Voltage; Windings; Permittivity; Core energy capacitance; high-frequency (HF) inductor; magnetics; NiZn ferrite; stray capacitance

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NiZn cores are commonly used in the high-frequency range due to their lower permeability and permittivity compared to other materials. Previous capacitance models based on perfect electrical conductor assumption are not applicable for NiZn cores. We propose a general core energy capacitance model obtained by solving the electric field boundary value problem, as well as a simplified model obtained through curve fitting to finite element analysis data. Both models are verified through simulation and experimental results in two case studies with rod and pot core structures.
In the high-frequency (3-30 MHz) range, NiZn cores are commonly used. They have much lower permeability and permittivity than materials typically used at lower frequencies, including MnZn ferrites. Previously used capacitance models rely on the perfect electrical conductor assumption. They are not applicable when NiZn cores are used. We propose a general core energy capacitance model found by solving the electric field boundary value problem. We also propose a simplified model by curve fitting to finite element analysis data. Both are verified by simulation and experimental results in two case studies with rod and pot core structures.

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