研究生: |
陳滄智 Tsang-chih Chen |
---|---|
論文名稱: |
具同步整流昇壓饋入式定頻半橋串聯諧振轉換器之研製 Desing and Implementation of a Boost-fed Constent-frequency Half-Bridge Series Resonant Converter with Synchronous Rectification |
指導教授: |
羅有綱
Yu-Kang Lo 邱煌仁 Huang-Jen Chiu |
口試委員: |
劉益華
none 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: | 2012 |
畢業學年度: | 100 |
語文別: | 中文 |
論文頁數: | 178 |
中文關鍵詞: | 交錯式昇壓轉換器 、串聯諧振轉換器 、同步整流電路。 |
外文關鍵詞: | Interleaved Boost Converter, Series-Resonant Converter, Synchronous Rectifier |
相關次數: | 點閱:183 下載:10 |
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本篇論文主要研製昇壓饋入式定頻操作半橋串聯諧振轉換器,其電路架構使用一組操作於不連續導通模式(Discontinuous-Conduction Mode, DCM)的交錯式昇壓轉換器,將後級串聯諧振轉換器輸出電壓回授至此昇壓轉換器,利用昇壓轉換器改變工作週期的工作方式,使串聯諧振轉換器電路於輕、中、重載時,皆能操作在諧振點上,以達到最佳效率。另一方面,控制IC電路所提供的信號,亦同時控制同步整流電路,讓轉換器在不同的負載電流條件下,同步整流控制信號皆可追隨一次側電路。藉由計算諧振電路所需的死域時間(Dead Time)和同步整流電路所需的延遲導通時間與提前截止時間,使得諧振電路在輕載至滿載的負載條件下時,皆能操作在零電壓切換(Zero-voltage-switching, ZVS)的工作模式。在輕載條件下,由於電路皆操作在諧振頻率上,可有效地降低切換損失,而在重載條件下時,同步整流電路可有效降低電路整體的導通損失,使得轉換器在不同的負載狀況下,均能達到最佳的轉換效率。
依據本論文所研製的150 W / 19 V電路,整體電路包含前級功因修正電路及後級昇壓饋入式定頻半橋串聯諧振轉換器,能於輕載時減少切換損失,於重載時降低導通損失,並於輕載時能有效穩定輸出電壓並提昇效率,於輕載2 A至滿載8 A實測效率皆可達到90 %以上。
This thesis presents a constant-frequency series resonant converter (SRC) with a pre-stage circuit of an interleaved DCM boost converter with a varied duty cycle regulated by output-voltage feedback. Under full-range load comditions, the series resonant converter is operated at the first resonant-frequency to achieve optimal efficiency performance. Synchronous Rectifier (SR) is also used to reduce the secondary rectification loss. The gating signals for synchromous rectifier are from a SR control IC to follow primary-side signals. For the studied SRC circuit, the zero-voltage-switcing (ZVS) at primary-side switches can reduce the switching losses at light-load condition due to resonant-frequency operation while the synchronous rectifier reduces the secondary rectification loss at heavy-load condition..
Finally, an 150W/19V laboratory prototype composed of a power factor corrector (PFC) and the studied boost-fed constant-frequency series resonant converter was implemented and tested. Theoretical analyses are verified with the experimental results. The measured efficiency can be higher than 90% at 2A light-load to 8A heavy-load conditions.
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