Correlated colour temperature control system and method
US9839090B2 · kind B2 · utility
Inventors
Key dates
| Filing date | May 27, 2014 |
| Grant date | Dec 5, 2017 |
| Priority date | — |
| Expiry date | May 27, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21Y2115/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A correlated color temperature control system (1) for a LED lighting system (2) having at least two LED sources (3, 4) with different correlated color temperatures. The LED lighting system (2) has a combined correlated color temperature resulting from the combination of the different correlated color temperatures of the at least two LED sources (3, 4), and a combined luminous flux resulting from the combination of the luminous fluxes of the at least two LED sources (3, 4), with each LED source being supplied with a supply current. The correlated color temperature control system (1) comprises a controller (5) to independently control one or both of the duty cycle and amplitude of each supply current, the duty cycle or amplitude of each supply current being varied by the controller in a non-linear relationship with the duty cycle or amplitude of at least one other of the supply currents, to generate a desired combined correlated color temperature for the LED lighting system (2) at a desired combined luminous flux for the LED lighting system (3, 4). An associated method is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.