Direct AC driving circuit and luminaire
US10542594B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 30, 2015 |
| Grant date | Jan 21, 2020 |
| Priority date | — |
| Expiry date | Jul 30, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to a direct AC driving circuit and a luminaire for driving at least one LED, the driving circuit comprises a LED string (2) that comprises a series connection of at least two LEDs, wherein the LED string (2) is directly powered from a rectified AC mains voltage and a LED string switching unit (1) that is configured to control at least one LED shortening unit (1′) that is arranged in parallel to at least one LED of the LED string (2′). According to the invention, the driving circuit comprises means configured to provide a low supply voltage (VLow) which is also derived from the rectified AC mains voltage (4), wherein the low supply voltage (VLow) is generated from unutilized voltage of the LED-string (2′).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.