Contents 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.
