LED lighting systems, LED controllers and LED control methods for a string of LEDs
US8937433B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 2013 |
| Grant date | Jan 20, 2015 |
| Priority date | — |
| Expiry date | Sep 13, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/44
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
LED controllers, LED lighting systems and control methods capable of providing an average luminance intensity independent from the variation of an AC voltage. A string of LEDs are divided into LED groups electrically connected in series between a power source and a ground. A LED controller has path switches, each for coupling a corresponding LED group to the ground. A management center controls the path switches, for making an input current from the power source to the string substantially approach a target value. A line waveform sensor coupled to the power source holds a representative signal during a cycle time of the power source. The representative signal is in response to an attribute of the power source, and substantially determines the target value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.