Flextronics Ap, LLC

Stefan Mörbe

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.

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Osnabrück, Germany

Stefan Mörbe