Lighting system having a dimming color simulating an incandescent light
US8456109B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 12, 2012 |
| Grant date | Jun 4, 2013 |
| Priority date | — |
| Expiry date | Dec 12, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/44
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lighting system has a white light source and a color light source, a control circuit pulses the white and color light sources and changes relative duty cycles of the light sources to alter a color output of the lighting fixture, in response to a change in a control signal from a controller. A comparator compares a reference voltage relating to an aggregate current driving the light sources to a signal voltage relating to the periodic signal from a signal generator. The comparator controls a switch that controls one of the light sources. A duty cycle of the color light source varies inversely to a duty cycle of the white light source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.