Piezoelectric Backlight Inverter System Control Chip
Date Issued
2004
Date
2004
Author(s)
Huang, Chao -Yen
DOI
zh-TW
Abstract
A half-bridge inverter with a cascading piezoelectric transformer (PT) is designed for cold cathode fluorescent lamps (CCFLs). The circuit systems are selected to achieve (1) smaller volume, (2) higher efficiency, and (3) backlight inverter power system on a chip (Power SOC) futurely.
A piezoelectric transformer is very attractive material since it has many advantages, low profile , high efficiency , no windings , and no electromagnetic noise.
A control strategy for piezoelectric transformer backlight inverter based on a constant frequency control and phase control is presented. The control always tracks piezoelectric transformer resonance frequency, independently of process variation and temperature variation.
Finally, a control chip circuit for half-bridge inverter with a cascading piezoelectric transformer is planned and designed.
Subjects
壓電變壓器
定頻控制相位控制
冷陰極螢光燈
Cold Cathode Fluorescent Lamp
CCFL
phase control
constant frequency control
piezoelectric transformer
SDGs
Type
thesis
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