Loading [MathJax]/extensions/MathMenu.js
Disc Piezoelectric Ceramic Transformers | IEEE Journals & Magazine | IEEE Xplore

Disc Piezoelectric Ceramic Transformers


Abstract:

In this contribution, we present our study on disc-shaped and homogeneously poled piezoelectric ceramic transformers working in planar-extensional vibration modes. Transf...Show More

Abstract:

In this contribution, we present our study on disc-shaped and homogeneously poled piezoelectric ceramic transformers working in planar-extensional vibration modes. Transformers are designed with electrodes divided into wedge, axisymmetrical ring-dot, moonie, smile, or yin-yang segments. Transformation ratio, efficiency, and input and output impedances were measured for low-power signals. Transformer efficiency and transformation ratio were measured as a function of frequency and impedance load in the secondary circuit. Optimum impedance for the maximum efficiency has been found. Maximum efficiency and no-load transformation ratio can reach almost 100% and 52 for the fundamental resonance of ring-dot transformers and 98% and 67 for the second resonance of 2-segment wedge transformers. Maximum efficiency was reached at optimum impedance, which is in the range from 500 Ω to 10 kΩ, depending on the electrode pattern and size. Fundamental vibration mode and its overtones were further studied using frequency-modulated digital holographic interferometry and by the finite element method. Complementary information has been obtained by the infrared camera visualization of surface temperature profiles at higher driving power.
Page(s): 1612 - 1618
Date of Publication: 02 August 2013

ISSN Information:

PubMed ID: 25004532

I. Introduction

Vibrations (strain) in piezoelectric transformers (PTs), common in primary and secondary part, are employed for the transformation of an ac input signal. PTs based on homogeneously polarized disc-shaped single plates have been studied both theoretically and experimentally [1]–[12]. Various electrode patterns have been proposed, with the ring-dot design being the most frequently studied because of its quite simple vibration spectrum [1], [2], [7], [10], [12]. A theoretical model of a disc ring-dot PT has been published in [12]. In this contribution, we introduce several new electrode patterns: moonie, wedge (2 or 4 segments), smile (2 or 3 segments), and yin yang design. All types are compared in terms of vibration spectra and transformation characteristics.

Contact IEEE to Subscribe

References

References is not available for this document.