Noise filter and noise reduction unit

Patent metadata

Field	Value
Publication number	US-2019006092-A1
Application number	US-201816021373-A
Country	US
Kind code	A1
Filing date	Jun 28, 2018
Priority date	Jun 29, 2017
Publication date	Jan 3, 2019
Grant date	—

Abstract

A noise filter ( 10 ) is equipped with a plurality of conductors ( 20 ) having respective winding portions ( 21 ) and a ring-shaped core ( 30 ) which is inserted through the winding portions of the a plurality of conductors and made of a magnetic material. The ring-shaped core is composed of a pair of divisional cores ( 41 ) and ( 42 ) which are combined together by joining each pair of joining surfaces ( 43 ) and ( 44 ), located at each end, of the pair of divisional cores and. The one divisional core is straight and is inserted through the winding portions of the a plurality of conductors. The other divisional core has partition walls ( 45 ) each of which is located between adjacent ones of the a plurality of conductors, projects toward the one divisional core, and serves to form a magnetic path between the partition wall and the one divisional core.

First claim

1 . A noise filter comprising:
a plurality of conductors each having a winding portion; and a ring-shaped core made from a magnetic material and being inserted through the winding portion, the ring-shaped core including a pair of divisional cores combined together by connecting each pair of joining surfaces located at each end of the pair of the divisional cores, one of the divisional cores having a straight shape and being inserted through the winding portion of each of the plurality of the conductors to arrange the plurality of the conductors in a row, the other of the divisional core having a partition wall located between adjacent conductors of the plurality of the conductors, the partition wall projecting toward the one divisional core to form a magnetic path between the one of the divisional core and the other of the divisional core, the ring-shaped core being configured to form a common-mode magnetic path surrounding all of the plurality of the conductors and a normal-mode magnetic path passing through the partition wall and surrounding each of the plurality of the conductors.

2 . The noise filter according to claim 1 , wherein
a gap is formed between the partition wall and the one of the divisional core.

3 . The noise filter according to claim 2 , wherein
a magnetic flux adjusting member containing a magnetic material is provided in the gap.

4 . A noise reduction unit comprising:
the noise filter according to claim 1 ; a housing holding the noise filter; and an electric wire of a wire harness introduced into the housing and electrically connected to at least one of the plurality of conductors of the noise filter.

5 . The noise reduction unit according to claim 4 , wherein
a sealing material is charged in the housing.

Assignees

• Yazaki Corp
• Toyota Motor Co Ltd

Inventors

• Iizuka Hayato
• Kayo Kazuma
• Aihara Hiroshi

Classifications

• H01F17/04

  with magnetic core · CPC title

• H03H1/00

  Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network (constructional details of electromechanical transducers H03H9/00) · CPC title

• H01F27/263

  Fastening parts of the core together · CPC title

• H03H2001/005

  Wound, ring or feed-through type inductor · CPC title

• H03H2001/0092

  Inductor filters, i.e. inductors whose parasitic capacitance is of relevance to consider it as filter · CPC title