The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 04, 2012
Filed:
Jun. 23, 2008
Carsten Deppe, Aachen, DE;
Ulrich Boeke, Langerwehe, DE;
Chenyang Liu, Shanghai, CN;
Peter Luerkens, Aachen, DE;
Carsten Deppe, Aachen, DE;
Ulrich Boeke, Langerwehe, DE;
Chenyang Liu, Shanghai, CN;
Peter Luerkens, Aachen, DE;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
Supply circuits for supplying voltage and current signals to light sources () comprise switches () and controllers () to control the switches () for reducing values of frequency components of harmonic content of power spectra of the light sources (). 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 () 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 () without the use of energy storage capacitors for reducing this visible flicker.