Journal of the Korean Institute of Illuminating and Electrical Installation Engineers (조명전기설비학회논문지)

The Korean Institute of IIIuminating and Electrical Installation Engineers (한국조명전기설비학회)
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LCD Backlight Drive Using The Piezoelectric Transformer

압전변압기를 이용한 LCD Backlight 구동

  • Published : 2003.03.01
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Abstract

The piezoelectric transformer converters electrical energy into mechanical energy, It is high efficiency and small size transformer for high output voltage. The piezoelectric transformer operates the resonance frequency and the output voltage waveform is close to sine wave. Therefore, it is suitable for driving the LCD backlight in the notebook computer. In this paper, we discussed about the inverter which os driving piezoelectric transformer by generating sine wave through LC resonance after converting input DC voltage to the gate signal of FET. As the result of experiments, it was showed that the resonance frequency and voltage gain of the piezoelectric transformer was proportional to the load variation, and voltage gain was independent of the input voltage variation.

기계적인 에너지를 전기적인 에너지로 변환시키는 장치인 압전변압기는 고전압\ulcorner고효율의 소형변압기이다. 압전변압기는 노트북용 LCD backlight 구동장치로 적합하며, 공진주파수에서 동작시 거의 정현파에 가까운 교류파형을 출력하는 장치이다. 본 논문에서는 입력 DC 전압으로부터 FET를 구동시키는 게이트 신호로 변환시킨 다음 LC공진을 통하여 정현파를 생성시켜 압전변압기를 구동시키는 인버터에 대하여 논의하였다. 실험결과 압전변압기의 전압 이득과 공진주파수는 부하에 비례하며, 전압 이득은 입력전압의 변화에는 무관하게 나타났다.

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References

  1. C. A. Rosen, “Ceramic transformers and filters”, Proceedings of the Electronic Symposium, pp. 205-211, May 1956.
  2. Zaitsu T et al, “Piezoelectric Transformer converter with PWM Control”, IEICE Transaction on Communications, Vol. E80-B, No. 7, pp. 1035-1044, 1997.
  3. H. W. Katz, “Solid state magnetic and dielectronic devices”, John Wiley & Sons, 1959.
  4. T. Zaitsu et al, “Piezoelectric transformer converter with frequency control”, IEEE INTELEC'95 Proc., pp. 175-180, Oct. 1995. https://doi.org/10.1109/INTLEC.1995.498948
  5. M. Sugimoto et al, “Very compact inverter for color LCD backlight utilizing a packaged piezoelectric transformer”, SID'96 Digest, pp. 757-760, 1996.
  6. M. Shoyama, T. Zaitsu et al, “Operation analysis of the push-pull piezoelectric inverter”, Proceeeding of APEC, pp. 573-578, Feb. 1997. https://doi.org/10.1109/APEC.1997.575617