Proceedings of the KIPE Conference (전력전자학회:학술대회논문집)

The Korean Institute of Power Electronics (전력전자학회)
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Modeling and Characteristics of PDA CCFL Driving Circuits for Piezoelectric Transformer

압전 트랜스포머를 이용한 PDA용 CCFL구동회로의 모델링과 동작특성

  • Hwang L.H. (Dept. of Electrical Engineering, Semyung University) ;
  • Jang E.S. (Dept. of Electrical Engineering, Semyung University) ;
  • Nam W.Y. (Dept. of Electrical Engineering, Semyung University) ;
  • Yoo J.H. (Dept. of Electrical Engineering, Semyung University) ;
  • Oh D.O. (Dept. of Electrical Engineering, Semyung University) ;
  • Cho M.T. (Dept. of Elecrical Engineering, Daewon Science College) ;
  • Ahn I.S (Dept. of Elecrical Engineering, Daewon Science College) ;
  • Joo H. J (Dept. of Elecrical Engineering, Daewon Science College)
  • Published : 2003.07.01
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Abstract

In this paper, to apply piezoelectric transformer for PDA backlight inverter, piezoelectric transformer using the composition which $Nb_2O_5$ added into PNW-PMN-PZT ceramics was fabricated as Rosen-type one with the size of $1165mm^3$. And their electrical characteristics were investigated with the variations of load resistance and driving frequency And then, the driving circuit for PDA CCFL(0.6W) which composed of the two MOSFETs connecting in series was manufactured using piezoelectric transformer, VCO and one-chip microprocessor. After driving for 25 min using the proposed circuit for PDA CCFL(0.6W), driving frequency of 214.4kHz, input voltage of 31.78 V and input current of 21.1mA were shown. And then, output voltage of 293.2 V and output current of 2.2mA were shown. At the same time, efficiency of 96.2$\%$ and temperature rise of $3.6^{\circ}C$ were appeared at the piezoelectric transformer.

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