T
treez
Guest
Hi,
At the Radiated EMC lab (30MHz to 1GHz) , putting a copper foil over a 10W (12V TO 5V) Buck SMPS had no effect on radiated emissions.
Why was this?
The copper foil cover only covered top and sides of the PCB...the back of the PCB was facing a metal enclosure....raised above it by some 10mm.
The copper foil was soldered to a short wire which was ring terminalled to the metal semi-open-enclosure in which the smps PCB sat.
The EMC antenna was "facing" the copper foil shield. (in the emc chamber).
The metal enclosure is open at the front...thats why we added the copper foil shield over the smps.
At the Radiated EMC lab (30MHz to 1GHz) , putting a copper foil over a 10W (12V TO 5V) Buck SMPS had no effect on radiated emissions.
Why was this?
The copper foil cover only covered top and sides of the PCB...the back of the PCB was facing a metal enclosure....raised above it by some 10mm.
The copper foil was soldered to a short wire which was ring terminalled to the metal semi-open-enclosure in which the smps PCB sat.
The EMC antenna was "facing" the copper foil shield. (in the emc chamber).
The metal enclosure is open at the front...thats why we added the copper foil shield over the smps.