Patent ID: 7535125

Claim:
A single-phase filter, comprising: a power system connector for connection to a source of electrical power; a load connector for connection to a load powered by the source of electrical power; a core of a magnetically permeable material; a first line winding having a first end directly connected to the power system connector and a second end coupled to the load connector, the first line winding wound around the core in an orientation that produces magnetic flux having a first polarity; a first shunt winding wound around the core in an orientation that produces magnetic flux having a second polarity opposite to the first polarity; and a capacitor connected in series between the first shunt winding and an essentially electrically common point at which both the source of electrical power and the load meet; wherein the core comprises: a first core bridge; a second core bridge spaced apart from the first core bridge; and three legs extending between the first core bridge and the second core bridge, wherein the first line winding is wound around one of the legs and the first shunt winding is wound around another one of the legs.