Choke coil for eliminating common mode noise and normal mode noise
US5506559A · kind A · utility
14Cited by
1References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 6, 1994 |
| Grant date | Apr 9, 1996 |
| Priority date | — |
| Expiry date | Oct 6, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F17/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A common mode choke coil has a couple of coils, a magnetic frame in which the coils are encased, the magnetic frame forming closed magnetic circuits around the respective coils, and a magnetic core which pierces through the magnetic frame. The frame is made of an insulating magnetic material which has a relative magnetic permeability of more than one, preferably two through some scores. For example, a mixture of ferrite powder of Ni--Zn and resin is used as the material of the frame. The core is made of a material which has a relative magnetic permeability of preferably several thousands, such as ferrite and amorphous.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.