Noise filter
US9692291B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 21, 2014 |
| Grant date | Jun 27, 2017 |
| Priority date | — |
| Expiry date | Oct 25, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/3376
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A noise filter is assembled to an electric power conversion device and has a metal housing casing and two capacitors connected to an external terminal of the device through which an electric power conversion circuit is connected to an external device. The two capacitors, the housing casing and the external terminal make a current loop. A magnetic flux of an alternating magnetic field generated in a part of the electric power conversion circuit penetrates in a first area and a second area formed in the current loop. A first induced noise current is induced in the current loop when the magnetic flux of the generated magnetic field penetrates in the first area. A second induced noise current is induced in the current loop when the magnetic flux penetrates in the second area so that the first induced noise current flows in a reverse direction to the second induced noise current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.