Patent · US Active

Low-overhead current generator for lighting circuits

US9532427B2 · kind B2 · utility

2Cited by

2References

8Claims

0Family size

Assignee

Dialog Semiconductor (UK) Limited · GB

Inventors

Fulvio Schiappelli · Pullach im Isartal, DE
Jiri Ledr · Česká Třebová, CZ
Alessandro Angeli · Munich, DE
Andrea Acquas · Firenze, IT

Key dates

Filing date	Jul 5, 2016
Grant date	Dec 27, 2016
Priority date	—
Expiry date	Jul 5, 2036

Classification

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

Abstract

This application relates to a lighting system comprising a plurality of light emitting diode, LED, circuits, and a power source for providing a drive voltage to the plurality of LED circuits. For each LED circuit, the lighting system comprises a first variable resistance element connected between the respective LED circuit and ground, and a first feedback circuit configured to control a voltage at a first node between the respective LED circuit and the respective first variable resistance element to a first voltage. The lighting system further comprises a current source and a second variable resistance element connected between the current source and ground, wherein each first variable resistance element is configured to attain a resistance value depending on a resistance value attained by the second variable resistance element.

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