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:
May. 30, 2006
Filed:
Mar. 06, 2003
Ulrich Klipstein, Wendeburg, DE;
Norbert Unzner, Dettum, DE;
Wilfried Brauckmann, Wendeburg, DE;
B & S Elektronische Geräte GmbH, Braunschweig, DE;
Abstract
The invention relates to ballast for a discharge lamp (), comprising a direct-current supply phase (), semiconductor switches (), operated at a high-frequency clock frequency for modifying the direction of current through the discharge lamp (), an ignition transformer (), which can be supplied with the direct current of the direct-current supply phase () via a series capacitor () and a choke inductance () that is connected to an electrode of the discharge of the discharge lamp (), said electrode not being connected to the ignition transformer (). To increase the ignition reliability of the discharge lamp (), a capacitor (), connected in series to a switch (), is connected between a junction point () of the series capacitor () and ignition transformer () on one side and a junction point () between the discharge lamp () and the choke inductance () on the other side, and the capacitor () and the choke inductance () form a series resonant circuit that is tuned to a higher harmonic of the clock frequency.