Choke coil for eliminating common mode noise and differential mode noise
US5581224A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 13, 1995 |
| Grant date | Dec 3, 1996 |
| Priority date | — |
| Expiry date | Oct 13, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F2003/106
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A choke coil which functions not only to eliminate common mode noise but also to eliminate differential mode noise. A couple of coils are wound around a circular first core and a second core which is disposed inside the circular first core. The second core has a circular frame and a bridge which is laid in the frame. The first core may be easy to become magnetic saturation but is made of a material with a large magnetic permeability, and preferably a material with a relative magnetic permeability of several thousand, such as ferrite and amorphous. The second core is made of a material which is hard to become magnetic saturation, and preferably a material with a relative magnetic permeability of some scores to several hundred, such as dust core.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.