Apparatus and method for limiting electromagnetic interferences in a switching converter
US10284078B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 2017 |
| Grant date | May 7, 2019 |
| Priority date | — |
| Expiry date | Dec 13, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/33507
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for limiting or preventing electromagnetic interferences in a switching converter are presented. In particular, a power circuit provided with an active electromagnetic interference filter is presented. There is an electromagnetic interference EMI reduction circuit for use with a switching converter. This EMI reduction circuit has a current source and is adapted to regulate a voltage across the current source to provide a current having a constant average value. The switching converter is adapted to provide a converter current, and the current source constant average value may be substantially equal to an average value of the converter current. The circuit has a variable resistance; and an adjuster adapted to adjust the variable resistance based on the converter current. The adjuster may have a comparator, which is adapted to compare a voltage value at a terminal of a transistor switch, and a reference value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.