Light emitting diode driving apparatus
US8111006B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 2008 |
| Grant date | Feb 7, 2012 |
| Priority date | — |
| Expiry date | Aug 8, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light emitting diode driving apparatus 10 of the present invention includes: a driving voltage generating section 11 for generating a driving voltage Vout of an LED; a driving current control section 12 for PWM controlling driving currents iW1 to iW3 that flow through the LED; and a monitor voltage generating section 13 that monitors the driving voltage Vout, and that generates a monitor voltage Vm during an OFF period of the driving current by superposing on a predetermined reference voltage Vref, which is used as a standard, a voltage corresponding to a difference occurring in the driving voltage Vout during the OFF period. The driving voltage generating section 11 performs feedback control of the driving voltage Vout such that feedback voltages VW1 to VW3 are equal to the reference voltage Vref during an ON period of the driving current, and the driving voltage generating section 11 performs feedback control of the driving voltage Vout such that the monitor voltage Vm is equal to the reference voltage Vref during an OFF period of the driving current Vout.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.