Integrated electromagnetic interference filter
US5083101A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 3, 1990 |
| Grant date | Jan 21, 1992 |
| Priority date | — |
| Expiry date | Jan 3, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H7/427
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An integrated electromagnetic interference filter includes an inductor assembly for attenuating both common mode and differential mode electromagnetic interference conducted emissions from electronic equipment. The inductor assembly includes an outer core of permeable material defining an outer window, and an inner core of permeable material disposed in the outer window and defining an inner window. A first power lead for connecting the equipment to a source of electrical power includes a portion wound in one direction about only the outer core. The inductor assembly includes a second power lead for connecting the equipment to the source of electrical power with a portion of the second lead wound about both the inner and outer cores in the opposite direction to the winding of the portion of the first power lead. The outer core provides a magnetic path for the attenuation of common mode emissions and the inner core provides a magnetic path for the attenuation of differential mode noise. The filter can also include a multiple function capacitor including three capacitive elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.