Patent · US Active

Supplying a signal to a light source

US8258713B2 · kind B2 · utility

5Cited by

2References

4Claims

0Family size

Assignee

KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

Carsten Deppe · Aachen, DE
Ulrich Boeke · Eschweiler, DE
Chenyang Liu · Shanghai, CN
Peter Luerkens · Aachen, DE

Key dates

Filing date	Jun 23, 2008
Grant date	Sep 4, 2012
Priority date	—
Expiry date	Mar 4, 2029

Classification

Technology area (CPC H)Electricity
CPC primaryH05B45/59
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

Supply circuits for supplying voltage and current signals to light sources (6) comprise switches (22, 32, 42, 52) and controllers (21, 31, 41, 51) to control the switches (22, 32, 42, 52) for reducing values of frequency components of harmonic content of power spectra of the light sources (6). By switching one of the voltage and current signals or by switching signals that result in one of the voltage and current signals, the other one of the voltage and current signals can be adjusted. The power spectrum of the light source (6) may be a function of the voltage and current signals. By adjusting one of them, the power spectrum can be adjusted such that values of frequency components of the harmonic content of the power spectrum are reduced. As a result, visible flicker is reduced in the light originating from the light source (6) without the use of energy storage capacitors for reducing this visible flicker.

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