2006•Journal of Magnetic Materials and DevicesRequires access

Leakage Inductance of Power Transformer in High Frequency Switch Mode Power Supply

Zhongwen Lan

Abstract

With the wide application of switch mode power supply(SMPS), electro-magnetic interference(EMI)has become an outstanding problem in many electrical systems. The leakage inductance of power transformer is one ofthe main interference sources in the circuit. In this paper, the EMI from the leakage inductance of power transformerwas described firstly. Then, the reason was analyzed why the leakage inductance had come into being, and thecalculation of leakage inductance was discussed. Finally, a common method for leakage inductance testing was given.

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Key concepts: Leakage inductance, EMI, Inductance, Electrical engineering, Transformer, Leakage (economics), Equivalent series inductance, Electromagnetic interference