Light source driver
US8471499B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 19, 2011 |
| Grant date | Jun 25, 2013 |
| Priority date | — |
| Expiry date | Jan 24, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2330/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light emitting diode (LED) driver is provided that includes a light emitting diode, a converter connected to the light emitting diode, wherein the converter receives an input voltage and converts the input voltage to a basic voltage for driving the light emitting diode, a current regulator connected to the light emitting diode, a first operational amplifier connected to the current regulator, an analog dimming voltage generating unit including a second operational amplifier, a first resistor, a second resistor, and a third resistor, wherein a first terminal of the first resistor, a first terminal of the second resistor, and a first terminal of the third resistor are connected to a non-inversion terminal of the second operational amplifier, and connected to the first operational amplifier, and a pulse-width-modulation dimming pulse generating unit connected to a second terminal of the third resistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.