Title:
COMMON MODE CHOKE COIL
Document Type and Number:
Japanese Patent JP3814776
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a common mode choke coil which is small and has less turns while a single of which covers a wide frequency band.
SOLUTION: A closed magnetic circuit magnetic core 2 is divided parallel to its magnetic path, comprising first split magnetic core 2a, second split magnetic core 2b, and third split magnetic core 2c of magnetic oxide of high magnetic permeability stacked together. As the closed magnetic circuit magnetic core 2 is formed of a magnetic oxide of high magnetic permeability, the impedance in a low frequency (10 kHz side) is high. With the cross-section area of the closed magnetic circuit magnetic core 2 (split magnetic core) set to small, the magnetic permeability in a high-frequency (10 MHz side) is higher due to a shape resonance phenomenon, for higher impedance as well. Thus, a noise is sufficiently attenuated over a wide frequency band, 10 kHz to 10 MHz.
Inventors:
Katayama Kunio
Okamoto Toshinori
Okamoto Toshinori
Application Number:
JP13996299A
Publication Date:
August 30, 2006
Filing Date:
May 20, 1999
Export Citation:
Assignee:
Minebea Co., Ltd.
International Classes:
H01F27/28; H01F37/00; H01F17/06; H01F27/24; H01F27/32; H01F3/10; H01F3/14; H01F27/33; H01F27/34; (IPC1-7): H01F37/00; H01F17/06; H01F27/24; H01F27/28
Domestic Patent References:
| JP62638U |
Attorney, Agent or Firm:
Calyx
Toshio Nakamura
Miyazaki Yoshio
Kaoru Onozuka
Toshio Nakamura
Miyazaki Yoshio
Kaoru Onozuka