Lighting system and control method thereof
US8957606B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 3, 2013 |
| Grant date | Feb 17, 2015 |
| Priority date | — |
| Expiry date | Oct 3, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/46
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lighting system includes: a rectifier full-wave rectified an AC voltage to generate an output voltage; first and second LED groups connected to each other in series, wherein an input terminal of the first LED group is coupled to the output voltage; first terminals of first and second switches respectively coupled to output terminals of the first and second LED groups; a first resistor having a first terminal connected to the second terminal of the first switch and the second switch and a second terminal connected to a ground voltage; and first and second operational amplifiers having output terminals respectively coupled to control terminals of the first and second switches, and inverting input terminals respectively coupled to the first terminal of the first resistor, and non-inverting input terminals respectively coupled to the first and second reference voltages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.