US 11,749,446 B2
Common-mode choke coil
Ryota Hashimoto, Nagaokakyo (JP); and Takashi Sukegawa, Nagaokakyo (JP)
Assigned to Murata Manufacturing Co., Ltd., Kyoto-fu (JP)
Filed by Murata Manufacturing Co., Ltd., Kyoto-fu (JP)
Filed on Jan. 31, 2019, as Appl. No. 16/264,189.
Claims priority of application No. 2018-038109 (JP), filed on Mar. 3, 2018.
Prior Publication US 2019/0272940 A1, Sep. 5, 2019
Int. Cl. H01F 27/28 (2006.01); H01F 17/04 (2006.01); H01F 17/00 (2006.01)
CPC H01F 27/2823 (2013.01) [H01F 17/04 (2013.01); H01F 17/045 (2013.01); H01F 2017/0093 (2013.01); H01F 2027/2838 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A common-mode choke coil comprising:
a core having a shape that extends along a center axis and including peripheral surfaces around the center axis, the peripheral surfaces including a first surface and a second surface that are opposite to each other and a third surface and a fourth surface that are adjacent to the first surface and the second surface and opposite to each other; and
a first wire and a second wire that are wound around the peripheral surfaces in same direction, that are not electrically connected to each other, and that are twisted together into a stranded portion, wherein,
in one turn of the stranded portion, a number of times the first wire is disposed outside the second wire on the first surface is equal to a number of times the second wire is disposed outside the first wire on the second surface, and a number of times the first wire is disposed outside the second wire on the third surface is equal to a number of times the second wire is disposed outside the first wire on the fourth surface,
the number of times the first wire is disposed outside the second wire on the first surface is different from a number of times the second wire is disposed outside the first wire on the first surface,
the first surface and the second surface are symmetrical in cross section perpendicular to the center axis, and
the first surface is outwardly bent and is not parallel in its entirety to the second surface in cross section perpendicular to the center axis.