Active EMI Noise-Canceling System

With the increase of active power conversion using higher switching (PWM) frequencies, the need for filtering and shielding increases proportionally to minimize crosstalk and to adhere EMC compliance. As power conversion is often done without galvanic separation, every measure taken on either side; supply and/or load has an immediate impact on the other. Circuit optimization can be done for pre-defined EMI test environments which then often fails in prnctical installations. EMI noise reduction solutions need to be created which are adaptive and self-optimize to their environment. Additionally, compared to conventional filtering, active EMI noise cancellation can be compact, cheap, unconditional stable, power and crosstalk reduction efficient. As such, active EMI noise cancellation will eliminate the need for heavy stiff shielded cables, large and heavy inductances and capacitor banks, used in filter stages, and as such save weight and volume. This paper is the result of the ongoing research on an active EMI noise cancelling concept [1] as presented at EMC Europe 2018 in Amsterdam. This project has been carried out under the European Project H-2020, ESCEL, I-Mech which ran from 2017 and was successfully accomplished 2020 [10-11].