Electromagnetic interference suppressor and methods
US5530634A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1995 |
| Grant date | Jun 25, 1996 |
| Priority date | — |
| Expiry date | Mar 31, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F2017/065
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
To suppress electromagnetic interference across a wide range of frequencies, in both magnetic and electrical fields, an emissive wire is surrounded by a ferrite core having an outer surface covered with a metal foil. The metal foil on the core or cores is grounded. If multiple cores are used in proximity, the foils of the several cores are electrically coupled together. In one embodiment, an omni-directional strobe light like the one shown in U.S. Pat. No. 5,155,666 is shielded by placing pairs of foil-covered ferrite cores around the wires at each apex of the polygon formed by the interconnected flash tubes, grounding the cores to the nearest lamp reflector, and grounding the reflectors together.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.