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. 01, 2014
Filed:
Jan. 30, 2011
John Stephane Hirsch, Eindhoven, NL;
Rene Van Honschooten, Eindhoven, NL;
Patrick Alouisius Martina DE Bruycker, Eindhoven, NL;
John Stephane Hirsch, Eindhoven, NL;
Rene Van Honschooten, Eindhoven, NL;
Patrick Alouisius Martina De Bruycker, Eindhoven, NL;
Koninklijke Philips N.V., Eindhoven, NL;
Abstract
A low-cost HID lighting system () comprises: —an HID lamp () having an aspect ratio less than 6; and —a resonant electronic driver () for driving the HID lamp, the driver being designed for providing alternating current to the lamp and including a control device () for determining the current frequency. The lamp has a frequency spectrum containing at least one arc-shaping acoustic resonance frequency as well as unwanted acoustic resonance frequencies. During normal operation, the lamp is provided with frequency-modulated lamp current so that the lamp current has a relatively broad power spectrum within a range between kHz and 200 kHz, so that said arc-shaping acoustic resonance is triggered while said unwanted acoustic resonances are avoided, irrespective of lamp orientation.