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:
Oct. 18, 2016
Filed:
Sep. 17, 2013
Koninklijke Philips N.v., Eindhoven, NL;
Henricus Marius Joseph Maria Kahlman, Dongen, NL;
Ralph Kurt, Eindhoven, NL;
KONINKLIJKE PHILIPS N.V., Eindhoven, NL;
Abstract
A circuit arrangement for operating at least one low-power lighting unit with a phase-cut operating voltage from a power supply is disclosed, which circuit arrangement comprises a serial setup of an input device (), a two-port power shaping circuit (″) and a lamp driver unit (″). The power shaping circuit (″) comprises at least a bleeder () and a damping circuit (). While the bleeder circuit () provides an alternative current path to set a global current, drawn during operation from the power supply to a predefined minimum load current, the damping circuit () serves to attenuate high frequency oscillations in said operating voltage. To enhance dimmer compatibility and simultaneously provide a cost-efficient circuit setup, a first and a second feedback circuit () is provided, allowing to control the bleeder circuit () and the lamp driver unit (″) according to a two-point control.