Effect of the auxiliary power supply of active circuits on the performance of active EMI filter

Compared to passive EMI filter, active EMI filter (AEF) used active circuits to process noise and provide a corresponding compensation noise. These active circuits required an auxiliary power supply, which can affect the proper functioning of the AEF. In the literature, the study and design of AEF have been the subject of several research. However, the issue of the power supply of AEF has not been presented and resolved. This paper gives an experimental study of the influence of the auxiliary power supply of active circuits on the performances of AEF. A functional prototype of common mode AEF for a Boost power converter that comply to the DO160 standard up to 1 MHz has been realized.