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. 18, 2004
Filed:
Jul. 19, 2002
Jose Andres Navas Sabater, Madrid, ES;
Mercedes Rivas Saiz, Madrid, ES;
Pedro Alou Cervera, Madrid, ES;
Roberto Prieto Lopez, Madrid, ES;
Javier Uceda Antolin, Madrid, ES;
José Antonio Cobos Marquez, Madrid, ES;
Alcatel, Paris, FR;
Abstract
A piezoelectric transformer converts a first voltage, supplied from a voltage source, into a second, different, stabilized voltage by a DC/AC converter followed by a rectifier connected in cascade to a filter. The DC/AC converter block includes a driver block followed by the piezoelectric transformer, such that the driver block feeds the piezoelectric transformer with a pulse train ( ) the frequency of which coincides with the switching frequency (F ) of switching elements included in the driver block. The switching frequency (F ) is less than a resonant frequency (FR) of the piezoelectric transformer; for example, the switching frequency is a sub-harmonic of the resonant frequency (FR).