Illumination device and method for determining a target lumens that can be safely produced by an illumination device at a present temperature
US9237612B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 26, 2015 |
| Grant date | Jan 12, 2016 |
| Priority date | — |
| Expiry date | Jan 26, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/3725
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An illumination device and methods are provided herein for avoiding over-current and over-power conditions in one or more power converters included within the illumination device. The illumination device may generally include a plurality of light emitting diode (LED) chains, a driver circuit, at least one power converter, a temperature sensor and a control circuit. The LED chains may produce illumination for the illumination device at a chromaticity consistent with a chromaticity setting. The power converter(s) may be coupled for powering the LED chains, and may each comprise a maximum safe current level or a maximum safe power level, which varies with temperature. The temperature sensor may be coupled for measuring a present temperature associated with the power converters. The control circuit may be configured for determining a target lumens value that can be safely produced by all LED chains at the present temperature to achieve the chromaticity setting without exceeding the maximum safe current level or the maximum safe power level associated with the power converters at the present temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.