Multilayered unipoled piezoelectric transformers

Shashank Priya, Seyit Ural, Hyeoung Woo Kim, Kenji Uchino, Toru Ezaki

Research output: Contribution to journalArticlepeer-review

44 Scopus citations


This study describes a multi-layer piezoelectric voltage and power transformer which has one direction poling, operates in a wide-frequency range and delivers both step-up and step-down voltages by inverting the electrical connections. In this design, the input and output electrodes are on the same side of the disk and are isolated from each other by a fixed gap. Investigations were performed on a disk of diameter 29.1 mm. The electrode pattern is a ring/dot structure, where a strip connects the dots. Various ratios of input to output area were studied and it was found that area ratio in the range of 2.8-3.3 or the output diameter in range of 13-15 mm yields high power and efficiency. The power density for the optimized single layer transformer was 40W/cm3 while that for the 3-layer structure was 25 W/cm3. Though the power increased with multilayer structure, the effective power density decreased because of the interlayer constraints.

Original languageEnglish (US)
Pages (from-to)3503-3510
Number of pages8
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number6 A
StatePublished - Jun 2004
Externally publishedYes


  • Automobile lighting
  • High power
  • Lead zirconate titanate
  • Piezoelectric Transformer
  • Power supply
  • Unipoled


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