A plate-shaped high power-density piezoelectric transformer with dual outputs

作者：Du JL; Hu JH^*; Tseng KJ

来源：Ceramics International, 2004, 30(7): 1797-1801.

DOI：10.1016/j.ceramint.2003.12.116

• piezoelectric transformer
• high power density
• dual outputs
• thickness shear vibration mode

In this study, a high power-density dual-output piezoelectric transformer is proposed and experimentally investigated. This transformer consists of a lead zirconate titanate (PZT) ceramic plate with a size of 30 turn x 5 mm x 1 turn. It has a high mechanical quality factor Q(m) and high electromechanical coupling coefficient k(eff). The PZT ceramic plate is poled along the width direction. The electrodes of input and output parts are on the top and bottom surfaces of the ceramic plate and separated by narrow gaps. Lead wires are pressed on the electrodes by a proper elastic force. At a temperature rise lower than 20degreesC, the piezoelectric transformer has a maximum output power density of 52.7 W/cm(3) with an efficiency of 88%. The maximum efficiency of this piezoelectric transformer is 95%. Voltage gains larger than one and smaller than one are obtained in one transformer. By using a parallel combination of the two outputs of the proposed transformer, a higher output power density of 57.3 W/cm(3) can be achieved at the temperature rise lower than 20degreesC.

• 出版日期2004
• 单位南阳理工学院