Parasitic Capacitance in Copper-Foiled Medium-Voltage Filter Inductors
- Hongbo Zhao ,
- Zhizhao Huang ,
- Dipen Narendra Dalal ,
- Jannick Kjær Jørgensen ,
- Asger Bjørn Jørgensen ,
- xiongfei wang ,
- Stig Munk-Nielsen
Abstract
This paper characterizes three parasitic capacitances in copper-foiled
medium-voltage inductors. It is found that the conventional modeling
method overlooks the effect of the fringe field, which leads to
inaccurate modeling of parasitic capacitances in copper-foiled
inductors. To address this problem, the parasitic capacitances
contributed by the fringe field is identified first, and a physics-based
analytical modeling method for the parasitic capacitances contributed by
the fringe field is proposed, which avoids using any empirical
equations. The total parasitic capacitances are then derived for three
different cases with three different core potentials, from which a
three-terminal equivalent circuit is derived, and thus, the parasitic
capacitances in copper-foiled inductors are explicitly identified. The
calculated results show a close agreement with the measured capacitance
by using an impedance analyzer.