Miniature Piezoelectric Transformer

Relative to tradition electromagnetic transformer, Piezoelectric transformer have the advantage of small, high set-up, none-flammable, none-electromagnetic pollution etc. it has overcome the defect of electromagnetic transformer and it is the indispensable part in the electronic information system.In this dissertation, the electric model has been set up, which can analyses the piezoelectric transformer. Based on this model, the film transformer has been designed, prepared and tested. In the dissertation, the work is as follows:1) The lump equivalent circuit of the single layer piezoelectric transformer has been set up, and the expression formulae of the equivalent inductance, capacity and resistance has been derived. It is found that under the same vibration mode, the equivalent inductance of the single layer piezoelectric transformer is the twice of the same quality piezoelectric oscillator;2) Based on the density energy formula, the three-dimensional lump type equivalent circuit of the piezoelectric transformer has been set up. In the studies, it has been shown that any piezoelectric transformer can be expressed with the lump type equivalent circuit model;3) Based on the lump type equivalent circuit of the piezoelectric transformer, the performances of piezoelectric transformer have been analyzed, and then the tri-factor expression formula of the piezoelectric transformer have been put forward. The validity has been verified;4) The thin film transformer has been designed, the preparation techniques of piezoelectric thin film have been studied and the preparation procedure of the thin film piezoelectric transformer have been confirmed. At last the thin film piezoelectric transformer is prepared and its performance have been tested.In all achievements, the following are comparatively outstanding:1) Based on the density energy formula, the three-dimensional lump typeequivalent circuit of the piezoelectric transformer has been set up. this is still the first time at home;2) The tri-factor method of piezoelectric transformer has been set up which consist of mechanical quality factor(Qm), electric quality factor(Qe) and electromechanical coupling factor (k). The validity is verified. These don't appeare in the newspapers at home and abroad;3) Prepare the thin film piezoelectric transformer and test the its performance. This doesn't appear in the newspapers still at home.