AC LED lighting systems and control methods efficiently providing operating voltage
US9661696B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2015 |
| Grant date | May 23, 2017 |
| Priority date | — |
| Expiry date | Nov 30, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A LED lighting system efficiently provides an operating voltage powering integrated circuits. A LED string has LEDs segregated into LED groups connected in series. A LED controller has channel nodes connected to the cathodes of the LED groups respectively, and an output node connected to a capacitor providing the operating voltage. The LED controller drains a channel current from a selected channel node among the channel node. The LED controller regulates the channel current to a channel target value corresponding to the selected channel node, and provides a portion of the channel current as a charging current to power and regulate the operating voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.