Light emitting diode driving apparatus
US8841851B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 2012 |
| Grant date | Sep 23, 2014 |
| Priority date | — |
| Expiry date | Mar 27, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/37
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light emitting diode (LED) driving apparatus is disclosed. The LED driving apparatus includes a rectifier for rectifying an alternating current (AC) voltage to supply a ripple voltage, a light emitting unit partitioned into two or more groups, each of the groups including a plurality of LEDs, and a driving controller for selectively driving one or more of the groups of the light emitting unit depending on a level of the ripple voltage, the driving controller driving at least one of the groups of the light emitting unit using current discharged from a capacitor connected with the at least one group when the ripple voltage is lower than an operating voltage of the light emitting unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.