EMI filter with an integrated structure of common-mode inductors and differential-mode capacitors realized by flexible printed circuit board
US7999633B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 6, 2008 |
| Grant date | Aug 16, 2011 |
| Priority date | — |
| Expiry date | Jan 12, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H1/0007
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An integrated structure of common-mode inductors and differential-mode capacitors in an EMI filter realized using a flexible circuit board, including: a closed magnetic circuit formed by a first magnetic core and a second magnetic core, optionally including an air gap formed in a middle pillar of the magnetic cores, and with a flexible printed circuit board (FPC) wound on at least one pillar, the FPC formed by laminating alternating insulating and copper foil layers. The integrated structure of inductors and capacitors is advantageous in reducing the volume of the EMI filter and improving the power density of an electronic power transformer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.