Patent ID: 8325500

Claim:
An inverter filter for a plurality of phases output by an inverter, said inverter filter comprising: a node; a differential mode filter comprising for each of said plurality of phases output by said inverter: a first terminal, a second terminal, an inductor electrically connected between the first terminal and the second terminal, and a first capacitor electrically connected between said inductor and said node; a third terminal which is grounded; and a common mode filter comprising: a resistor, and a second capacitor electrically connected in series with the resistor between said node and said third terminal, wherein said differential mode filter is selected from the group consisting of a sine filter and a dV/dt filter, wherein said first capacitor is electrically connected between said second terminal and said node, wherein said plurality of phases are three phases, wherein the inductor for each of said three phases has an inductance, Lf, wherein said three phases include three inductors having a common mode inductance, Lcm, wherein said three inductors form a three-phase, three-leg iron core reactor, and wherein said three phases have a low voltage and 0.05*Lf<Lcm<0.07*Lf, or said three phases have a medium voltage and 0.1*Lf<Lcm<0.22*Lf.