A power conversion system comprising a noise source and a load, and an apparatus for active feed forward electromagnetic interference, EMI, filtering operatively coupled between the noise source and the load, comprising: a filter comprising an inductor having a terminal connected to the noise source, and a second terminal connected to both the load and to a capacitor, the second terminal of the capacitor being connected to the output of a noise voltage compensation circuit; a noise voltage detection sensor configured to sense an EMI noise voltage (V noise) occurring at the noise source; an active feed forward circuit operatively coupled to the noise voltage detection sensor, the active feed forward circuit comprising; a current reconstruction circuit (420; 700) comprising an operational amplifier circuit configured to reconstruct an EMI noise current which is directly representative of the EMI noise current through the inductor; the noise voltage compensation circuit configured to generate a voltage noise compensation signal based on the reconstructed EMI noise current by the current reconstruction circuit, said EMI noise voltage being directly representative of the inverted EMI noise voltage across the capacitor which is induced by the EMI noise current through the inductor; wherein the filter is configured to cancel the received EMI noise based on the received voltage noise compensation signal to reduce EMI noise at the load; wherein the filter includes the inductor and the capacitor configured to receive the EMI noise occurring at the noise source at a first terminal, and is configured to receive the voltage noise compensation signal from the active feed forward sensor at a second terminal opposed to the first terminal, wherein the capacitor is configured to maintain a substantially steady voltage to attenuate the received EMI noise received at the first terminal based on the received voltage noise compensation signal at the second terminal. a filter comprising an inductor having a terminal connected to the noise source, and a second terminal connected to both the load and to a capacitor, the second terminal of the capacitor being connected to the output of a noise voltage compensation circuit; a noise voltage detection sensor configured to sense an EMI noise voltage (V noise) occurring at the noise source; an active feed forward circuit operatively coupled to the noise voltage detection sensor, the active feed forward circuit comprising; a current reconstruction circuit (420; 700) comprising an operational amplifier circuit configured to reconstruct an EMI noise current which is directly representative of the EMI noise current through the inductor; the noise voltage compensation circuit configured to generate a voltage noise compensation signal based on the reconstructed EMI noise current by the current reconstruction circuit, said EMI noise voltage being directly representative of the inverted EMI noise voltage across the capacitor which is induced by the EMI noise current through the inductor; wherein the filter is configured to cancel the received EMI noise based on the received voltage noise compensation signal to reduce EMI noise at the load; a current reconstruction circuit (420; 700) comprising an operational amplifier circuit configured to reconstruct an EMI noise current which is directly representative of the EMI noise current through the inductor; the noise voltage compensation circuit configured to generate a voltage noise compensation signal based on the reconstructed EMI noise current by the current reconstruction circuit, said EMI noise voltage being directly representative of the inverted EMI noise voltage across the capacitor which is induced by the EMI noise current through the inductor; wherein the filter is configured to cancel the received EMI noise based on the received voltage noise compensation signal to reduce EMI noise at the load; wherein the filter includes the inductor and the capacitor configured to receive the EMI noise occurring at the noise source at a first terminal, and is configured to receive the voltage noise compensation signal from the active feed forward sensor at a second terminal opposed to the first terminal, wherein the capacitor is configured to maintain a substantially steady voltage to attenuate the received EMI noise received at the first terminal based on the received voltage noise compensation signal at the second terminal.