Abstract
Fast switching in SMPS generate large amount of Electromagnetic Interference (EMI).The proposed method to determine Common Mode (CM) and Differential Mode (DM) noise of a low power Switched Mode Power Supply (SMPS) using two-probe approach i.e. using one current probe as an injecting probe and other current probe as receiving probe Common Mode (CM) noise is measured between power line and ground. Differential Mode (DM) noise is measured between each power lines. EMI radiated emissions occur in the range of 150 KHz-30MHz. EMI filter is usually needed in the input of the Switch Mode Power Supply (SMPS) to attenuate the noise. The proposed approach allows measurement of noise level in Switched Mode Power Supply without interleaving its normal operation. With proper set up calibration, the proposed approach can be used to measure the noise level with reasonable accuracy. The noise level is measure from the frequency of 1MHz-3MHz using signal generator the signal is induced in the injected probe and using receiving probe noise level is measured in db using spectrum analyser.
Highlights
In the field of power electronics, there is a trend for pushing up switching frequencies of Switched Mode Power Supplies to reduce volume and weight
It leads to a general Electromagnetic Compatibility (EMC) degradation for electronic devices
The total conducted Electromagnetic Interference (EMI) noise is caused by two mechanisms, the Differential Mode (DM) and Common Mode (CM) Noise
Summary
In the field of power electronics, there is a trend for pushing up switching frequencies of Switched Mode Power Supplies to reduce volume and weight. The Differential Mode (DM) noise is related to Switching Current and the Common Mode (CM) noise is related to Capacitive Coupling of switching voltage into Line Impedance Stabilizing Network (LISN), which is used in standard conducted EMI measurement.
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