MULTI-OUTPUT PIEZOELECTRIC INVERTER AND TRANSFORMER THEREOF

專利類型

發明

專利國別 (專利申請國家)

美國

專利申請案號

11/619,909

專利證號

US 7,474,040 B2

專利獲證名稱

MULTI-OUTPUT PIEZOELECTRIC INVERTER AND TRANSFORMER THEREOF

專利所屬機關 (申請機關)

國立臺灣大學

獲證日期

2009/01/06

技術說明

本發明提出一種多輸出壓電換流器(piezoelectric inverter)，應用特殊設計之多輸出壓電變壓器，可同時驅動兩組或兩組以上負載；壓電變壓器工作之升壓比與負載阻抗值及工作頻率相關，所以應用壓電變壓器點兩根或兩根以上之冷陰極管時，會因為冷陰極管在點亮前後阻抗變化之特性，發生其中一支冷陰極管亮了而其他支冷陰極管未亮的點亮問題，本發明所提多輸出壓電換流器，透過對多輸出壓電變壓器結構和輸出入電極形狀的設計，有效降低阻抗對多輸出壓電變壓器升壓比之影響，解決多燈管之點亮問題，應用多輸出壓電換流器於大型液晶電視背光燈系統中，可減少換流器數目進而降低成本。 A multiple-output piezoelectric transformer which could drive two or more loads at the same time is proposed. The step-up ratio of piezoelectric transformer depends highly on the loading impedance and the working frequency. Therefore, when adopting piezoelectric transformer to drive two or more than two Cold Cathode Fluoresce Lamps (CCFL), the lamps will suffer from lighting problem due the impedance change before and after lighting of lamps. The proposed multiple-output piezoelectric transformer could reduce the influence of loading impedance to the step-up ratio of piezoelectric transformer by designing the transformer structure and input/output electrode shapes. Therefore, the multiple-output piezoelectric transformer could drive two or more than two CCFL without lighting problem. By adopting the multiple-output piezoelectric transformer into the backlight system of LCD TV, the cost could be lowered due to fewer numbers of inverters needed.

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本部(收文號1070019757)同意該校107年3月20日校研發字第1070020371號函申請終止維護專利

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