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:
Feb. 19, 2013
Filed:
Jun. 09, 2008
Michael Bothe, Seligenstadt, DE;
Stefan Mörbe, Osnabrück, DE;
Michael Bothe, Seligenstadt, DE;
Stefan Mörbe, Osnabrück, DE;
Flextronics AP, LLC, Broomfield, CO (US);
Abstract
The present invention relates to voltage transformers, comprising multi-layer structures of piezoelectric ceramics, so-called piezoelectric transformers. The present invention further relates to switched mode power supplies, comprising such a piezoelectric transformer as part of a piezoelectric converter. The piezoelectric transformer according to the invention comprises a primary-side electrode arrangement () that can be connected to the primary-side voltage, a secondary-side electrode arrangement () on which the secondary-side voltage can be tapped, and an auxiliary electrode arrangement () for creating an auxiliary electrode voltage proportional to the secondary-side voltage, wherein the auxiliary electrode arrangement () is formed by at least two plane electrodes located opposite one another. A circuit arrangement for a switched mode power supply having at least one such piezoelectric transformer () comprises a control circuit (), wherein the auxiliary electrode voltage is added to the control circuit () as a control variable for controlling the output voltage of the switched mode power supply.