Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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The Characteristics of $\lambda$ Vibration-Mode Type Piezoelectric Transformer

$\lambda$ 진동모드형 압전 변압기의 특성

  • Jeong, S.H. (Dept. of Electrical Eng., Daewon Science College) ;
  • Lee, J.S. (Dept. of Electrical Eng., Chungbuk Nat'l Univ.) ;
  • Hong, J.K. (Dept. of Electrical Eng., Chungbuk Nat'l Univ.) ;
  • Chai, H.I. (Dept. of Electronic material device, Jusung College) ;
  • Yoon, M.S. (Dept. of Electronic material device, Jusung College) ;
  • Lim, K.J. (Dept. of Electrical Eng., Chungbuk Nat'l Univ.)
  • Published : 1999.11.20
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Abstract

In this paper, the electrical characteristics of $\lambda$ vibration-mode piezoelectric transformer for applying to CCFL driving inverter was investigated. Piezoelectric transformer was made of PZT - PMN - 0.5wt% $Nb_{2}O_{5}$ composition. As a results of the electrical characteristics of piezoelectric transformer, when applied voltage was $35[V_{rms}]$ in $100[k{\Omega}]$ load resistance, output voltage was about $710[V_{rms}]$ and output power was more than 2[W]. As output power increased, step-up ratio and temperature was very stable until output power was 2.5[W]. Also, Efficiency was maximum in $70[k{\Omega}]$ load resistance, and about 89[%]. Also, when CCFL was used as load, the maintaining voltage was $700[V_{rms}]$ and the luminescence was $2000[cd/m^2]$ in applying $25[V_{rms}]$ to piezoelectric transformer. Conclusively, piezoelectric transformer fabricated in this paper can be applied to piezoelectric inverter for CCFL driving.

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