Effects of Thickness and Input/Output Area Ratio on Electrical Characteristics of Circular Ring/Dot Type Piezoelectric Transformer

Abstract

Many types of piezoelectric transformer (PT) have been developed for more than 50 years. In this research, the voltage gain (V-gain) from circular ring/dot type PTs which have 2–3 mm thicknesses and 1–7 input/output area ratios (i/o area) was investigated under the criteria of 10⁴–10⁶ Hz input voltage (V_in) and 500–100,00 Ω connected load resistance (R_L). Results showed that 1) The maximum V-gain was located near its 1st resonance frequency measured on input electrode, 2) The V-gain was significantly increased with i/o area and R_L. 3) Large V-gain was obtained in high i/o area PT connected to large enough load resistance.

Keywords:

• Piezoelectric Transformer
• Lead Zirconate Titanate
• PZT

Acknowledgment

The authors would like to thank Narong Pimpru for his assistance with electrical measurements. The financial support of this work by Suranaree University of Technology is also gratefully acknowledged.