Dual-permeability core structure for use in high-frequency magnetic components
US5062197A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 1990 |
| Grant date | Nov 5, 1991 |
| Priority date | — |
| Expiry date | May 7, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49076
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A dual-permeability magnetic core structure is provided for use in small, high-frequency inductors and transformers. The dual-permeability core encloses a winding window containing planar windings and comprises high-permeability and low-permeability sections positioned to produce a highly uniform, or uniformly varying, magnetic field on the winding surfaces. The dual-permeability core products low winding losses and a low AC-to-DC resistance ratio. Fabrication of the dual-permeability core involves a method of controlling the permeability of a magnetic material and a methd of combining structures of two different permeability values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.