Study and Implementation of the Driving Inverter for an Electroluminescent Display

• Main Authors: TSOU TENG FENG, 鄒騰鋒
• Other Authors: Yu-Kang Lo
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/04741202076081286485

碩士 === 國立臺灣科技大學 === 電子工程系 === 95 === A suitable AC power supply for the Electroluminescent Display is presented in this thesis. The circuit mainly consists of a front-stage power factor corrector and a single-phase full-bridge inverter. A PIC16F873A microcontroller produces SPWM signals which can reduce the ELD driving current to be much lower than 10mA/nF and help to extend the lamp lifetime. An axuiliary power supply is designed for the PIC microcontroller and the PowerMOS gate driver, so that the circuit can be directly operated via AC line. The output brightness control circuit is also proposed in this thesis. After a long time of usage and the aging of ELD happen, the circuit will adjust the output frequency to maintain the ELD output brightness and increase the effective working hours.