Simple Approach to Predict Near Field Electromagnetic Interference in SMPS Using the Induced EMF Method


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Abstract


The electromagnetic interference generated by a switched-mode power supply on a victim circuit is analysed representing their electromagnetic field coupling by two-port networks. The essential electromagnetic interference sources of the switched-mode power supplies are individuated and their mutual impedances with the victim circuit are calculated by the induced EMF method. The two-port representation of the field coupling allows the noise voltage on a victim circuit to be predicted. As a victim circuit a circular loop representing a magnetic field probe used in near field measurements is considered. The approach is applied to a flyback converter and validated through experimental measurements.
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Keywords


EMC; SMPS; Electromagnetic Coupling; Hertzian Dipole; Induced EMF Method; Near Field

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