Method for frequency control of a piezoelectric transformer and circuit arrangement with a piezoelectric transformer

摘要

The invention relates to a frequency control method of a piezoelectric transformer (1), wherein a piezoelectric transformer (1) is excited at an input side (1a) with an AC voltage of a predetermined frequency and a phase information of the input impedance of the piezoelectric transformer (1) is detected in a feedback path , Subsequently, the detected phase information is evaluated with regard to a predetermined phase criterion and the frequency of the alternating voltage is regulated as a function of the evaluated phase information. Furthermore, a circuit arrangement for carrying out a corresponding frequency control is described.