Back to results
US 5,629,661 AGranted
Choke coil for eliminating common mode noise and normal mode noise
AssigneeMurata Manufacturing Co., Ltd.
InventorsTakaaki Ooi, Kouichi Yamaguchi, Tatsuyuki Yamada, Iwao Fukutani
Life of this patent
Estimating the term…
Abstract
A choke coil having a sufficient noise eliminating effect against common mode and normal mode noises. The choke coil has a bobbin, a pair of windings wound around the bobbin, and magnetic cores inserted in a rectilinear body portion of the bobbin. The bobbin is constituted by a main body and a cap each of which incorporates a magnetic core. The upper half of those magnetic cores forms a closed magnetic circuit that extends around one of the windings while the lower half forms a closed magnetic circuit that extends around the winding.
Claims6
A choke coil comprising:
- a pair of windings;
- a bobbin having a main body including a body portion around which said pair of windings are wound, flange portions provided on the body portion, and a cap bonded to a circumferential end face of each of said flange portions of the main body, said bobbin incorporating a first magnetic core which surrounds at lust a segment of each of said pair of windings, wherein said first magnetic core forms a closed magnetic circuit for eliminating normal mode noise and wherein said first magnetic core having a first core portion in said main body and a second core portion in said cap;
- and
- a second magnetic core separated and offset from said first magnetic core forming a closed magnetic circuit for eliminating common mode noise one side of which is inserted in a hole in said body portion.
1 more element
Dependencies are inferred from the claim text.