Experimental Study of Active EMI Filters for the Reduction of EMI Passive Elements in SMPS for TV Power

In previous studies, the effects of CM active EMI and DM active EMI filters were analyzed. This study aims to experimentally confirm the CM and DM reduction effects by combining the previously researched CM active EMI and DM active EMI filters in SMPS for TV power supplies. After applying the active EMI filter combined with CM and DM, the effects were confirmed by comparing the S21 transfer characteristics. The reduction of the CM and DM noise components was confirmed through PSIM simulation applying the entire SMPS circuit. The increase in the leakage current owing to the capacitor component applied to the active EMI filter was experimentally measured, and the power consumed by the active EMI filter was applied. In addition, the power supply method of the active EMI filter was designed and applied such that the standby power remained unaffected.