公开(公告)号：US20170316869A1

公开(公告)日：2017-11-02

申请号：US15525491

申请日：2015-06-24

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yoshiharu OMORI ,  Takeshi ICHIHARA ,  Kenji UENO

IPC: H01F27/28 ,  H03H7/42 ,  H03H1/00

CPC classification number: H01F27/2804 ,  H01F17/0013 ,  H01F2017/0073 ,  H01F2017/0093 ,  H01F2027/2809 ,  H03H1/00 ,  H03H7/427 ,  H03H2001/0085 ,  H03H2001/0092

Abstract: A common mode noise filter includes a first coil and a second coil. The first coil is formed in a plurality of insulating layers and includes a spiral first coil conductor and a spiral second coil conductor. The second coil is formed in the plurality of insulating layers and includes a spiral third coil conductor and a spiral fourth coil conductor. The first and third coil conductors are magnetically coupled to form a first common mode filter unit, and the second and fourth coil conductors are magnetically coupled to form a second common mode filter unit. As viewed from above, a first direction in which currents flow through the first and third coil conductors in the first common mode filter unit is opposite to a second direction in which currents flow through the second and fourth coil conductors in the second common mode filter unit.