Controlling multiple groups of LEDs
US9603213B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 2016 |
| Grant date | Mar 21, 2017 |
| Priority date | — |
| Expiry date | Feb 5, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/48
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The described invention provides a method of and circuitry for driving three or more groups of light emitting diodes (LEDs) using time division multiplexing, whereby a periodic signal is divided among groups of LEDs, each with a different color or color temperature. The LEDs may be driven to produce colors along a desired path of values. Other qualities of light besides color or color temperature may be similarly controlled along a path of values. In some implementations, the system may receive an oscillating signal, which may be used as a periodic signal for comparison with the control signal, and one or more offset voltages, each of which may be combined with the oscillating signal to provide a second oscillating signal. The control signal may be compared to both of the oscillating signals to determine if a particular LED group may be powered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.