Patent · US Active

Current source and method for providing a driving current

US9148914B2 · kind B2 · utility

0Cited by

4References

12Claims

0Family size

Assignee

AMS AG · AT

Inventors

Michael Bohm · Heimstetten, DE
Peter Trattler · Graz, AT
Mario Manninger · Graz, AT

Key dates

Filing date	Apr 30, 2013
Grant date	Sep 29, 2015
Priority date	—
Expiry date	Feb 20, 2034

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02B20/30
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

In one embodiment a current source comprises an input (In) for receiving a brightness signal (Sb), and an output (Out) for providing a driving current (Id) for at least one light-emitting diode, LED, wherein the current source (CS) is configured to extract a first and a second current value (idac_high, idac_low) from the brightness signal (Sb), to derive a duty cycle value (Smod) from the brightness signal (Sb) and to modulate the driving current (Id) as a function of the duty cycle value (Smod) in a pulse-width modulation comprising the first and the second current values (idac_high, idac_low). Furthermore, a method for providing a current is described.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.