Light-emitting device driving circuit for dynamically adjusting turn-off time length of switch
US8098027B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2008 |
| Grant date | Jan 17, 2012 |
| Priority date | — |
| Expiry date | Jul 31, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/375
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light-emitting device driving circuit and a method thereof are provided. A terminal of a light-emitting device is coupled to a supply voltage and a cathode of a diode via an inductor, and the other terminal is coupled to an anode of the diode. The light-emitting device driving circuit includes a switch, a current-sensing circuit, and a switch control circuit. The current-sensing circuit is coupled to the anode of the diode via the switch to determine whether or not to generate a turning-off control signal according to a conducting-current value of the switch. The switch control circuit controls an on/off state of the switch, and turns off the switch according to the turning-off control signal. Besides, the switch control circuit compares the conducting-current value with a reference-current value to generate a comparing result to dynamically adjust a time length of turning off the switch accordingly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.