SMPS conduction noise due to magnetic coupling

Q.  Which among the below specified conduction noise is generated due to magnetic coupling and is measured between each power line and ground especially during EMI transmission in SMPS?
- Published on 25 Sep 15

a. Differential Mode Noise
b. Normal-Mode Noise
c. Transverse-Mode Noise
d. All of the above

ANSWER: All of the above

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    Discussion

  • Satyawati Patil   -Posted on 06 Oct 15
    In SMPS, there are two types of EMI transmission – Radiated & conducted noise. Conducted noise is categorized into differential mode noise & common mode noise.

    The noise which occurs due to magnetic coupling and is measured between each power line and ground, is regarded as ' Differential mode noise'. It is also renowned as 'Normal-mode noise' or 'Transverse mode noise'.

    On the contrary, common mode noise is measured between Line and ground. It occurs due to stray capacitance & may be coupled through high frequency transformer or along the paths possessing parasitic or stray capacitance.

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