Light emitting diode driver providing current and power control
US7944420B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 28, 2007 |
| Grant date | May 17, 2011 |
| Priority date | — |
| Expiry date | Mar 16, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B47/165
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
As apparatus for controlling operating parameters for a light emitting diode (LED). A driver receives an input voltage from a voltage source and a control signal. The driver provides a driver output current to the LED based on the control signal. The LED has an LED voltage as a function of the driver output current and has an LED power as a function of said LED voltage and said driver output current. A controller determines the LED voltage and produces the control signal provided to the driver as a function of the LED voltage. The control signal corresponds to a constant driver output current when the LED voltage is less than a predetermined voltage value. The control signal corresponds to a varying driver output current for substantially maintaining the LED power at a constant predetermined power value web the LED voltage is greater than the predetermined voltage value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.