研究生: |
楊馨傑 HSIN-CHIEH YANG |
---|---|
論文名稱: |
液晶電視400瓦交/直流電源模組之研製 Design and Implementation of a 400-W AC-DC Power Supply for TFT-LCD TV |
指導教授: |
羅有綱
Yu-Kang Lo |
口試委員: |
楊宗銘
Chung-Ming Young 邱煌仁 Huang-Jen Chiu 歐勝源 none |
學位類別: |
碩士 Master |
系所名稱: |
電資學院 - 電子工程系 Department of Electronic and Computer Engineering |
論文出版年: | 2007 |
畢業學年度: | 95 |
語文別: | 中文 |
論文頁數: | 120 |
中文關鍵詞: | 液晶電視、功率因數修正、串聯諧振轉換器、零電壓切換、同步整流、電流模式降壓型轉換器、低待機損耗 |
外文關鍵詞: | synchronous rectifier, current-mode buck converter, low standby power |
相關次數: | 點閱:222 下載:4 |
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本篇論文主要研製一適用於47吋以上的液晶電視的400瓦電源供應器,輸出規格如下,液晶面板電源:24 V/12 A、主系統端電源:12 V/7 A與喇叭電源:5 V/6 A。電源模組中使用主動式功率因數修正電路為前置穩壓器,以提高功率因數並減少輸入電流的總諧波失真率。DC-DC轉換器電路架構則為半橋式串聯諧振轉換器,配合零電壓切換與同步整流電路提高轉換效率。喇叭電源電路為電流模式之降壓型轉換器。所研製之電源供應器有過電壓與過電流保護機制,以提供電源模組之安全保護。在輔助電源方面,採用低空載損耗之返馳式轉換器架構,提供待機模式下所需之系統電源。
雛型電路的實驗測量結果,驗證了本論文所提電源架構與控制方法的可行性。全機轉換效率在輸入電壓為110 Vrms以上時均達約88 %,而待機損耗則低於0.5 W,且於全載範圍內輸出電壓的穩壓率均在規範之內。
This thesis presents a 400-W power supply for TFT-LCD TV with panel sizes over 47 inches. The output specifications of the presented power supply are 24 V/12 A for LCD panel, 12 V/7 A for main system, and 5 V/6 A for loudspeakers. An active power factor corrector (PFC) is used to improve the input power factor (PF) and reduce the total harmonic distortion (THD) of the input current. A half-bridge series resonant converter (SRC) topology is adopted as the DC-DC conversion stage. Meanwhile, a current-mode buck converter supplies the required power for the loudspeakers. In order to provide safe protections for the power module, the over-current and over-voltage protection mechanisms are included. To achieve the standby mode system operations, the Tinyswitch flyback converter which features low no-load loss is used for the auxiliary power circuit.
Experimental results on a prototype power supply verify the feasibility of the proposed circuit topology and the control method. Conversion efficiency at 110 Vrms input voltage exceeds 88 %. Also the standby power is less than 0.5 W. The output voltages are within the specified regulations for the entire load range.
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