US 12,272,486 B2
Common mode choke coil
Tatsuya Sasaki, Nagaokakyo (JP); Shinya Hirai, Nagaokakyo (JP); and Shin Hasegawa, Nagaokakyo (JP)
Assigned to Murata Manufacturing Co., Ltd., Kyoto-fu (JP)
Filed by Murata Manufacturing Co., Ltd., Kyoto-fu (JP)
Filed on Oct. 27, 2022, as Appl. No. 18/050,298.
Application 18/050,298 is a division of application No. 16/143,114, filed on Sep. 26, 2018, granted, now 11,508,515.
Application 16/143,114 is a continuation of application No. PCT/JP2017/009438, filed on Mar. 9, 2017.
Claims priority of application No. 2016-074223 (JP), filed on Apr. 1, 2016.
Prior Publication US 2023/0075661 A1, Mar. 9, 2023
Int. Cl. H01F 27/28 (2006.01); H01F 17/06 (2006.01); H01F 27/02 (2006.01); H01F 27/24 (2006.01); H01F 27/29 (2006.01); H01F 17/00 (2006.01)
CPC H01F 27/2823 (2013.01) [H01F 17/062 (2013.01); H01F 27/02 (2013.01); H01F 27/24 (2013.01); H01F 27/2828 (2013.01); H01F 27/29 (2013.01); H01F 27/292 (2013.01); H01F 2017/0093 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A common mode choke coil comprising:
a core having a square shape when viewed in a direction along a central axis of the core; and
a first coil and a second coil opposed to each other in a direction along a first side of the square and wound on the core in a direction along a second side of the square,
wherein
each of the first coil and the second coil is a single-layer coil, and
an area of a cross-section of the core taken perpendicular to a circumferential direction of the core is constant in the circumferential direction of the core, and the cross-section of the core has a quadrilateral shape, and
wherein
when Φdw<2Rin and (lz+2Φdw+2Cc−p)≥2Rin,
(Φdw+2Cc−p)≥2Rin, where
Φdw is a coil diameter,
Cc−p is a clearance between an inner surface of the core and the coil,
lz is a minimum distance between the first coil and the second coil in an inner area of the core, and
Rin is a radius of curvature of an inner corner of the core.