Apparatus for driving a plurality of segments of LED-based lighting units
US9055639B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 2012 |
| Grant date | Jun 9, 2015 |
| Priority date | — |
| Expiry date | Jun 21, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/46
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An LED-based lighting apparatus includes a plurality of LED-based lighting segments connected in series with a current control device. Each lighting segment has at least one LED-based lighting unit connected in series. A plurality of switch controllers controlled by a switching voltage comparator unit is connected with the plurality of LED-based lighting segments to provide multiple operation modes for turning on different number of LED-based lighting segments. In one embodiment, each switch controller is connected in parallel with a corresponding segment. The switching voltage comparator unit generates a propagation signal that propagates through and controls the plurality of switch controllers. In the other embodiment, each switch controller is connected between a positive end of the corresponding segment and a current control device. The switching voltage comparator unit generates two propagation signals that propagate through and control the plurality of switch controllers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.