Shielded multi-stage EMI noise filter
US9490766B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 2014 |
| Grant date | Nov 8, 2016 |
| Priority date | — |
| Expiry date | Aug 9, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K2201/10219
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Electromagnetic interference (EMI) noise filter embodiments and methods for filtering are provided herein. EMI noise filters include multiple signal exclusion enclosures. The multiple signal exclusion enclosures contain filter circuit stages. The signal exclusion enclosures can attenuate noise generated external to the enclosures and/or isolate noise currents generated by the corresponding filter circuits within the enclosures. In certain embodiments, an output of one filter circuit stage is connected to an input of the next filter circuit stage. The multiple signal exclusion enclosures can be chambers formed using conductive partitions to divide an outer signal exclusion enclosure. EMI noise filters can also include mechanisms to maintain the components of the filter circuit stages at a consistent temperature. For example, a metal base plate can distribute heat among filter components, and an insulating material can be positioned inside signal exclusion enclosures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.