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:
Jul. 16, 2013
Filed:
Dec. 12, 2008
Jacob Dijkstra, Eindhoven, NL;
Wilhelmus Ettes, Eindhoven, NL;
Schelte Heeringa, Eindhoven, NL;
Petrus Johannes Bremer, Eindhoven, NL;
Jacob Dijkstra, Eindhoven, NL;
Wilhelmus Ettes, Eindhoven, NL;
Schelte Heeringa, Eindhoven, NL;
Petrus Johannes Bremer, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A wake-up lighting device is described, comprising a gas discharge lamp () and a lamp driver () comprising a power source () capable of generating spaced-apart current bursts () of alternating lamp current (I). The wake-up lighting device is capable of operating in an off-mode in which no lamp current is generated, and is adapted to switch from its off-mode to a wake-up mode in which the power source () operates to:—initially generate an alternating lamp current (I) with a minimum duty cycle value (ΔT) and a reduced current amplitude (IR) close to zero;—subsequently gradually increase the current amplitude while keeping the duty cycle (Δ) constant at the minimum duty cycle value (ΔT), until the current amplitude reaches a nominal current amplitude (IM);—subsequently gradually increase the duty cycle (Δ) while keeping the current amplitude constant at the nominal current amplitude (IM).