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EMI measurement and separation of the Common and the Differential Mode components of noise is necessary to design proper filter to mitigate EMI. It is also important to determine, which component is dominant in a particular frequency range so that the power supply filter may be modified to suit the regulatory limits. Fourier series Analysis is used in this paper to determine the area of dominance...
The EMI generated by SMPS is an important topic for research because international EMC regulations have become stricter. Many papers have been published in this area. This paper is an effort to briefly review the categorization of various modes of noise generated by SMPS with fly-back converter topology. The effect of Mixed Mode noise is similar to Differential Mode noise but its sources are same...
Putting a Y-capacitor between the primary ground and secondary ground is a common practice in industry to reduce EMI; but, this capacitor increases touch current. A method is discussed to measure the touch current at circuit design level. An optimum value of Y-capacitor is predicted without exceeding touch current limit. Experimental results of touch current measurements and EMI measurements are analyzed.
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