Design of a circular piezoelectric transformer with crescent-shaped input electrodes

Burhanettin Koc, Yongkang Gao, Kenji Uchino

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

In this study, a new disk-type piezoelectric transformer design is proposed. The input side of the transformer has a crescent-shaped electrode and the output side has a focused poling direction. The electrodes and poling directions on commercially available piezoelectric ceramic disks were designed so that the planar or shear mode coupling factor (kp or k15) becomes effective rather than the transverse mode coupling factor (k31). ATILA finite element code was used to analyze transformer behavior and to optimize electrode and poling configurations. The voltage step-up ratio of the proposed transformer has been markedly improved in comparison with that of the equivalent rectangular type. A single layer prototype transformer, 25.4 mm in diameter and 1.0 mm thick, operated at 92.8 kHz, was fabricated and its characteristics, such as step-up ratio and power transformation efficiency were measured. While the transformer was driving a cold cathode fluorescent lamp (CCFL), the temperature field of the transformer was also observed.

Original languageEnglish (US)
Pages (from-to)509-514
Number of pages6
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume42
Issue number2 A
StatePublished - Feb 1 2003

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transformers
Electrodes
electrodes
Fluorescent lamps
Piezoelectric ceramics
Temperature distribution
Cathodes
coupled modes
Electric potential
cold cathodes
piezoelectric ceramics
luminaires
temperature distribution
prototypes
shear
output
electric potential
configurations

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

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Design of a circular piezoelectric transformer with crescent-shaped input electrodes. / Koc, Burhanettin; Gao, Yongkang; Uchino, Kenji.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 42, No. 2 A, 01.02.2003, p. 509-514.

Research output: Contribution to journalArticle

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