Patent ID: 7745970
Filing Date: 2010-06-29
Classification: H02M,H05B

Abstract:
1. A circuitry comprising: a converter for generating an alternating current signal from energy from an energy source; a piezo transformer with an input and an output, wherein the input of the piezo transformer is electrically coupled to the converter to receive the alternating current signal from the converter as an input side excitation, and wherein the output of the piezo transformer is designed to provide an output current; and a load coupled to the output of the piezo transformer so that output current flows through the same, which is designed to convert at least part of the electrical energy supplied by the output current flowing through the load into another form of energy, and which is further designed such that a useful power provided in the form of useful energy is substantially proportional to the output current; and wherein the circuitry is designed to adjust the output current to a predetermined value; the circuitry further comprising an output current determiner for deriving an output current description signal, which is proportional to the output current, as well as an input current determiner for deriving an input current description signal, which describes a phase position of a current flow in the converter or a phase position of the alternating current signal provided to the input of the piezo transformer by the converter, as well as a regulator, wherein the regulator is designed to control the converter to regulate a phase difference between the output current description signal and the phase position described by the input current description signal to a predetermined value.