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Emission noise is noise that is output from an SMPS to the outside,
and there are conduction noise and radiation noise.
Conducted noise is noise that is conducted through the AC line and emitted
outside the SMPS.
Conducted noise is measured using the equipment shown below.
Radiated noise is electromagnetic noise that is radiated into space,
and is measured using an antenna like the one shown below.
Radiated noise is often measured in a shielded room to block out electromagnetic noise from outside.
Common mode filters like the some below are effective for suppressing noise in SMPS.
Select a common mode filter with a band that matches the frequency of the noise you want to suppress.
In addition to common mode filters, there are several other methods for suppressing noise in SMPSs.
Immunity noise refers to the resistance of an SMPS to noise that it receives from outside.
Y-capacitor connection method and lightning surge resistance.
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