PFM scheme for boost and flyback converter in LED backlight application
US10009968B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 2016 |
| Grant date | Jun 26, 2018 |
| Priority date | — |
| Expiry date | Mar 14, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2330/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
This application relates to systems, methods, and apparatus for controlling a switching frequency of a boost or flyback converter to be above an audible frequency range when operating the boost or flyback converter in a pulse frequency modulation (PFM) mode. The boost or flyback converter uses one or more switches for converting power for a display panel. In order to boost the switching frequency when operating in the PFM mode, the boost or flyback converter can selectively implement certain current and/or voltage limits for pulses that are generated as a result of the switching. The current and/or voltage limits can be set according to a load of the boost or flyback converter, and a correspondence between the current and/or voltage limits and the loads can be stored in a lookup table accessible to the boost or flyback converter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.