Active Noise Canceller for the Reduction of Differential-Mode Noise in Low-Frequency Band of DC/DC Converter

Smart meters are installed in many counties to promote the smart grid system. EMI noise is generated in the switching frequency band of several tens of kHz by power electronics devices such as PV inverters. It causes the smart meter to malfunction. Thus, the regulated frequency band of conduction noise will be expanded to the lower frequency band of 9 kHz - 150 kHz. This paper proposes an active noise canceller (ANC) to reduce differential-mode (DM) noise in this low-frequency band. The ANC makes contribution to reducing low-frequency EMI noise without the need to increase the EMI filter volume. This study reports the effectiveness of the proposed ANC through experiments.