Patent ID: 8217746

Claim:
A choke coil for an interleaved power factor control (PFC) circuit, comprising: first and second magnetic cores, each core having a central leg, side legs on respective opposite sides of the central leg, and a connection part connecting the central leg to the side legs; a first coil winding around the central leg of the first magnetic core; a second coil winding around the central leg of the second magnetic core; and a third magnetic core having a flat plate shape, wherein end surfaces of the side legs of the first and second magnetic cores are face-to-face with each other, with the third magnetic core between the end surfaces, gaps are present between the third magnetic core and end surfaces of each of the central legs of the first and second magnetic cores, respectively, respective electrical currents flow in the first and second coil windings in the same direction, and magnetic fluxes generated by the respective electrical currents and passing through the third magnetic core are in opposite directions.