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:
Mar. 13, 2007
Filed:
Jun. 19, 2006
Bernd Rudolph, Forstern, DE;
Bernd Rudolph, Forstern, DE;
Abstract
The invention relates to an electronic ballast for operating a discharge lamp LA, in which a pump circuit D, C, C, Lcharges an intermediate circuit capacitor Cfrom the AC voltage of a converter V, V. A voltage limitation circuit R, R, D, R, R, C, SD is connected in parallel with the intermediate circuit capacitor C. A dissipation element Rin the voltage limitation circuit R, R, D, R, R, C, SD converts electrical energy into thermal energy when a maximum value for the voltage across the intermediate circuit capacitor Cis exceeded. The current through the measuring resistor Ris measured as the voltage UCacross the measuring resistor R, is detected in a delay circuit R, R, Cand is used to control a shutdown device SD for the converter V, V