Choke coil for eliminating common mode noise and normal mode noise
US5977853A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1996 |
| Grant date | Nov 2, 1999 |
| Priority date | — |
| Expiry date | Feb 2, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F37/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
There is provided a choke coil having a sufficient noise eliminating effect against common mode and normal mode noises. The choke coil has two bobbins, a pair of windings wound around the respective bobbins, first and second magnetic cores which are each inserted in cylindrical body portions of the bobbins at one side thereof, and a support member for supporting the cores. The first magnetic core is in the form of the character B and made of a material having lower permeability. The second magnetic core is in the form of the character D and made of a material having higher permeability. A predetermined gap is maintained between the cores by a spacer provided on the top surface of the support member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.