- 學位論文
高功率壓電式換流器應用於發光二極體背光模組之研究
The Research of High Power Piezoelectric Based Inverter Applied to LED Backlight
摘要
近年來發光二極體逐漸在液晶螢幕的背光源應用中嶄露頭角，當解決發光二極體的發光效率及大尺寸螢幕的排列及均流問題後，發光二極體已經不只於小尺寸筆記型電腦的市場。本論文以壓電式電容取代傳統式電容設計LC震盪器，使用壓電式換流器來點亮發光二極體，以達到高功率、高安全性、穩定性佳以及體積小的設計要點。 針對壓電電容的設計取不同直徑、不同厚度作極限耐流的測試，以得知靜態電容與機械電流、溫度變化的關係。針對LC震盪器的設計，串聯電感值是非常重要的，良好的設計可以使LC震盪器穩定的工作及達到零電壓切換的要求。 最後本論文比較直流轉直流用換流器與直流轉直流用變流器的輸入功率，經實驗證實可以得知換流器的設計不但適合壓電電容的應用也可以減少效率的損耗。
並列摘要
In recent years, LED is widely applied to LCD screen backlight, LED backlight will be a large market when solve the problem of the LED efficiency and the problem of current balance and LED arrangement in the larg size LCD monitor. In this thesis, the piezoelectric materials were adopted as piezoelectric capacitance to design LC oscillator and applied to piezoelectric based inverter to light LED bar. The piezoelectric based inverter can achieve high power, high stability and low profile. For getting the relationship between the static capacitance and the limit mechanical current and temperature, tested the limit current in different diameter and different thickness. The design for the LC oscillator, suitable inductor of series inductance can make the oscillator work stable and achieve ZVS to reduce the power loss. By comparing the input power of DC/AC inverter and DC/DC converter, the efficiency of DC/AC inverter is better than DC/DC converter, so the piezoelectric capacitance is appropriate for design the piezoelectric based inverter.