Complete AC input filters for emissions compliance
Line Filters
Single-phase AC line filters combining a common mode choke with X and Y capacitors in one assembly, characterised and tested as a block. Rated 1A to 10A, with custom builds designed around the emissions scan that failed.
The one product here that is an assembly rather than a wound part. Characterised and tested as a block, so the attenuation you specify is the attenuation you measure.
CM choke — High impedance to noise on both lines at once; invisible to the load current.
X2 across the lines — Shunts differential noise — the kind a switching supply makes.
Y2 to earth — Returns common-mode noise to earth. Safety-rated, and capacitance-limited by leakage current rules.
Insertion loss
Frequency
Single stage
Dual stage
150 kHz — where conducted-emissions limits begin. A filter that only works above a few MHz will not pass the scan.
Attenuation across the conducted-emissions band
Single-stage topology · add a second stage when one leaves no margin