Method and system for improving LED lifetime and color quality in dimming apparatus
US9572211B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 2015 |
| Grant date | Feb 14, 2017 |
| Priority date | — |
| Expiry date | May 18, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/3725
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a pulse width modulation light emitting diode (LED) controller an error amplifier and output load switch are synchronously controlled to prevent service life shortening current overshoot through the LEDs and slowing discharging currents causing color temperature shifting in the light output from the LEDs. A plurality of switching arrangements for the error amplifier and the compensation network may be provided in a single integrated circuit LED dimming controller, and outputs for controlling a variety of differently configured output power switch combinations for disconnecting or shorting the LEDs, or disconnecting the output capacitor during off times of the modulated dimming control signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.