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:
Dec. 07, 1999
Filed:
Aug. 27, 1998
Albert Comberg, Aachen, DE;
Rebekka Porath, Aachen, DE;
U.S. Philips Corporation, New York, NY (US);
Abstract
The invention relates to a circuit arrangement with a piezoelectric transformer having two electrodes arranged on the primary side of the transformer and such a piezoelectric transformer itself. Piezoelectric transformers of this type are used, for example, for the power supply or control of lamps or electron tubes. For controlling such a piezoelectric transformer directly on the primary side by a most frequently available DC voltage, instead of an AC voltage as is customary, according to the invention a DC voltage source is connected to the electrodes and a switching device is provided for interrupting the supply of voltage to at least one electrode, the positions of the switching device being dependent on the state of expansion of the primary side of the transformer. The switching device is thus periodically closed and opened, the applied DC voltage is thus interrupted periodically.