Title :
The electrical properties of piezoelectric transformers using PMS-PZ-PT ceramics [for LCD backlights]
Author :
Mun, Nam-Chil ; Lee, Sang-Don ; Lee, Jae-Shin ; Jeong, Yeon-Hak ; Kim, Young-Sun
Author_Institution :
Sch. of Mater. & Metall. Eng., Ulsan Univ., South Korea
Abstract :
The voltage step-up characteristics of the Rosen-type piezoelectric transformers using Pb(Mn1/3Sb2/3)O 3-PbZrO3-PbTiO3 ceramics were investigated as a function of the width (W) and length (L). Two types of PT were prepared in this study; one type with W>L and the other with W<L. With increasing the area of PT by increasing the L or the W in the range of 12~42 mm, the voltage step-up ratio, Vout/Vin, was also increased in both cases. The step-up ratio under a load resistance of 100 MΩ was almost same in both types of PT with same area. However, the voltage step-up ratio under a load resistance of 150 kΩ, which corresponds to the turn-on condition of LCD backlight, the transformer showed better characteristics when W>L
Keywords :
lead compounds; liquid crystal displays; piezoceramics; piezoelectric devices; power transformers; 100 Mohm; 12 to 42 mm; 150 kohm; LCD backlight; PMS-PZ-PT ceramics; Pb(Mn1/3Sb2/3)O3-PbZrO3 -PbTiO3 ceramics; Pb(MnSb)O3-PbZrO3-PbTiO3; Rosen-type piezoelectric transformers; length dependence; load resistance; poling treatment; turn-on condition; voltage step-up characteristics; width dependence; Ceramics; Dielectric losses; Impedance; Inorganic materials; Inverters; Liquid crystal displays; Powders; Research and development; Transformers; Voltage;
Conference_Titel :
Science and Technology, 2000. KORUS 2000. Proceedings. The 4th Korea-Russia International Symposium on
Conference_Location :
Ulsan
Print_ISBN :
0-7803-6486-4
DOI :
10.1109/KORUS.2000.866120
