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 (102) that can be connected to the primary-side voltage, a secondary-side electrode arrangement (104) on which the secondary-side voltage can be tapped, and an auxiliary electrode arrangement (106) for creating an auxiliary electrode voltage proportional to the secondary-side voltage, wherein the auxiliary electrode arrangement (106) is formed by at least two plane electrodes located opposite one another.

Abstract: The invention relates to an input circuit for a logic circuit part, comprising a voltage converter component for conversion of a mains voltage to the required low voltage in order to supply a user with a low voltage. The supply to the input circuit may hence be connected to a mains supply to rectify the mains voltage and an output from the input circuit may be connected to the voltage converter component to provide a rectified input voltage for the voltage converter component. According to the invention, an improved input circuit for a logic circuit part with improved functionality and operating security also permitting an extensive miniaturization and simplified production may be achieved by replacement of at least two of the remaining four diodes in the rectifier part of an input circuit for a logic circuit part by two controllable switches which work as a synchronous rectifier and are connected such as to be switched on and off by alternate forced control.

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 (102) that can be connected to the primary-side voltage, a secondary-side electrode arrangement (104) on which the secondary-side voltage can be tapped, and an auxiliary electrode arrangement (106) for creating an auxiliary electrode voltage proportional to the secondary-side voltage, wherein the auxiliary electrode arrangement (106) is formed by at least two plane electrodes located opposite one another.

Abstract: A flexible flat conductor and a power supply unit including the flexible flat conductor. The flexible flat conductor includes at least two electrically conductive layers which are at least partially surrounded by an electrically insulating cover. The electrically conductive layers are insulated from one another by at least one dielectric layer arranged therebetween. At least a first one of the electrically conductive layers is patterned in at least one subarea thereof by openings in such a way that a plurality of meandrous elements is formed. The meandrous elements are serially juxtaposed in a plane defined by the fiat conductor, so as to form a filter structure.