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:
Aug. 13, 2002
Filed:
Jan. 23, 2001
Stefan Koch, Dornbirn, AT;
Günter Marent, Dornbirn, AT;
Tridonic Bauelemente GmbH, Dornbirn, AT;
Abstract
An electronic ballast for at least one low-pressure discharge lamp contains an inverter which is connected to a direct-voltage source (U ), a load circuit which is connected to the inverter and contains the lamp (LA) and a series resonant circuit, and an evaluating circuit arrangement (M ) which reacts to different operating states of the lamp (LA) and in the case of a defect or removal of the lamp (LA) generates corresponding signals for switching off the inverter. A heating transformer, for heating the coils (W W ), the primary winding (Tp) of which is connected in series with a switch (S ) to the output of the inverter and in any case is connected to the direct-voltage source (U ) if the inverter is switched off on account of the heating-coil defect or the removal of the lamp (LA), with the switch (S ) being clocked in this off-phase.