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. 03, 2012
Filed:
Jan. 22, 2007
Uwe Liess, Treviso, IT;
Bernd Rudolph, Forstern, DE;
Uwe Liess, Treviso, IT;
Bernd Rudolph, Forstern, DE;
OSRAM AG, München, DE;
Abstract
A circuit arrangement for operation of lamps, including a half-bridge arrangement which has an upper and a lower electronic switch (Q, Q), which are connected in series, each having a control connection and forming a neutral point (N) at their connection point. The circuit arrangement further includes: a load circuit, in which a load circuit current (IL) flows, is connected to the neutral point (N); a feedback device; a stop device; a timer coupled to the input of the stop device; and a trigger device. A sequence controller is configured to preset an on-time (t) during the preheating time of the electrodes of the lamps, by means of the timer, and after the preheating time of the electrodes of the lamps, this on-time is continuously increased until it corresponds at least to one quarter of the period duration of the resonant frequency of the reactance network.