Open AccessAnalytical estimation of parasitic capacitances in high‐voltage switching transformers
Author(s) -
Mirzadarani Reza,
Mohammadi Hamid Reza,
Ketabi Abbas,
Motahari Seyed Reza,
Ghorbani Alimorad
Publication year - 2020
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2020.0053
Subject(s) - parasitic capacitance , transformer , capacitor , capacitance , inductor , voltage , engineering , electromagnetic coil , electrical engineering , electronic engineering , topology (electrical circuits) , physics , electrode , quantum mechanics
Parasitic capacitances in transformers consist of three main groups: winding‐to‐winding, layer‐to‐layer, and stray capacitances. Stray capacitance is also made of turn‐to‐turn and turn‐to‐core capacitances. This study presents a novel analytical method for calculating the values of turn‐to‐turn, turn‐to‐core, and stray capacitances in each winding, and employs the results to calculate the equivalent parasitic capacitance especially for high‐voltage switching transformers. The proposed analytical method introduces an explicit formula in terms of the winding and core dimensions. This formula can be applied in performance analysis and design optimisation methods. By utilising the proposed formula, calculation of the equivalent parasitic capacitance neither takes a great deal of time nor requires a particular computer system. The analytical results are verified by simulation results using the finite‐element method and experimental results achieved by a practical prototype of a high‐voltage switching transformer employed in a 390 W, 15 kV inductor–capacitor–inductor–capacitor resonant converter.