Calculation of leakage inductance in transformer windings

Author

Hurley, William G. ; Wilcox, David J.

Author_Institution

Dept. of Electron. Eng., Univ. Coll. Galway, Ireland

Volume

9

Issue

1

fYear

1994

fDate

1/1/1994 12:00:00 AM

Firstpage

121

Lastpage

126

Abstract

A formula is presented to calculate mutual impedance between transformer windings on ferromagnetic cores. The formula is based on the solution of Maxwell´s equations for coils on ferromagnetic cores and as such offers the ultimate in accuracy. The formula is frequency dependent, taking into account the effect of eddy currents in the core on the flux distribution as well as representing the eddy current core loss as an equivalent resistance. Experimental results are presented for leakage inductance and an illustrative example is presented showing how leakage inductance affects the operation of a typical switching mode power supply. Approximations for the formula are also presented to simplify the calculations under certain operating conditions

Keywords

Maxwell equations; eddy current losses; eddy currents; equivalent circuits; inductance; magnetic flux; magnetic leakage; switched mode power supplies; transformer cores; transformer windings; Maxwell´s equations; accuracy; approximations; coils; core loss; eddy currents; equivalent resistance; ferromagnetic cores; flux distribution; leakage inductance; mutual impedance; switched mode power supply; transformer windings; Coils; Core loss; Eddy currents; Frequency dependence; Impedance; Inductance; Maxwell equations; Power supplies; Transformer cores; Windings;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/63.285502

Filename

285502