Predicting the SMPS radiated EMI in the transformer level
Predicting the SMPS radiated EMI in the transformer level
(OP)
Hello all,
For predicting the conducted interferences caused by an SMPS, there is the EMC box, which you can use in the transformer level, ie. to solely measure the transformer.
But is there any similar kind of quick method in the transformer level for predicting the final RADIATED interferences of an SMPS, say, by measuring something from the winding? I understand the unevenness or "messiness" of the winding is very crucial considering radiated EMI, so how to measure this?
Best regards,
Jaakko
For predicting the conducted interferences caused by an SMPS, there is the EMC box, which you can use in the transformer level, ie. to solely measure the transformer.
But is there any similar kind of quick method in the transformer level for predicting the final RADIATED interferences of an SMPS, say, by measuring something from the winding? I understand the unevenness or "messiness" of the winding is very crucial considering radiated EMI, so how to measure this?
Best regards,
Jaakko





RE: Predicting the SMPS radiated EMI in the transformer level
Dan - Owner

http://www.Hi-TecDesigns.com
RE: Predicting the SMPS radiated EMI in the transformer level
-Jaakko
RE: Predicting the SMPS radiated EMI in the transformer level
Electromagnetic radiation in the near field can be predominantly in the E or H fields, but total radiated power should be measured with a calibrated antenna and the proper equipment.
It is also highly likely that much of the total radiated noise power will come from other parts of the circuit as well as just the transformer. No way to fudge this, you really need to get the whole contraption tested by an EMC lab, and act on whatever advice they offer on how to fix it if it is outside the limit.