Active EMI filtering using magnetic coupling cancellation
US7898827B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 2008 |
| Grant date | Mar 1, 2011 |
| Priority date | — |
| Expiry date | Jun 4, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H7/1766
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An active electromagnetic interference (EMI) filtering may reduce the requirements for high current differential mode inductors. The active EMI filtering of the present invention may be useful in power devices that use switching power converters. Conventional EMI differential mode filtering devices may occupy up to 30% of the total weight and volume of the power electronics. Conventional differential mode filtering inductors tend to be large and heavy, especially so for high current input power lines. The present invention may replace the large conventional differential mode filtering inductors with a smaller set of coupled inductors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.