研究生: |
林以哲 Yi-che Lin |
---|---|
論文名稱: |
車用可調壓直流充電器之研製 Design and Implementation of an Vehicalar DC Charger with Adjustable-Output |
指導教授: |
羅有綱
Yu-Kang Lo 邱煌仁 Huang-Jen Chiu |
口試委員: |
林忠義
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: | 2014 |
畢業學年度: | 102 |
語文別: | 中文 |
論文頁數: | 127 |
中文關鍵詞: | 交錯式LLC串聯諧振轉換器 、疊電壓輸出 |
外文關鍵詞: | Interleaved LLC series resonant converter, cascoded output |
相關次數: | 點閱:363 下載:14 |
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本論文主要研製一台2.1 kW高效率車用直流充電器,其輸出為200 V至420 V,主要架構採用雙組輸出交錯式半橋LLC串聯諧振轉換器,輸出電壓分別為150 V及300 V。第一組輸出電壓150 V係利用調整切換頻率達成穩壓,另一組輸出電壓300 V則作為後級降壓型轉換器之輸入電壓;降壓型轉換器以脈波寬度調變方式調整輸出電壓,並將此可調電壓與第一組輸出電壓150 V疊接,而得到總輸出電壓。LLC串聯諧振轉換器操作於Region-2時,變壓器一次側開關具有零電壓切換之特性,變壓器二次側之二極體具有零電流切換特性,因此可減少切換損耗,提升整機效率;且因為交錯式操作之緣故,可有效降低輸入電容之電流應力及其漣波成份。最後,本文設計2.1 kW之高效率車用直流充電器雛型電路以驗證可行性,根據實驗結果,在低壓輸出、半載以上的效率可達93%以上;而在高壓輸出、半載以上的效率可達95%以上。
This thesis presents the design and implementation of a 2.1-kW high-efficiency vehicular DC charger. The output voltage range is from 200 V to 420 V. The adopted topology is a dual-output interleaved half-bridge LLC series resonant converter (SRC). The first output voltage is 150 V, which is regulated by adjusting the switching frequency. The second output voltage is 300 V, which supplies to a buck post regulator with pulse-width modulation (PWM) control. The tunable output voltage of the buck converter is cascoded with the regulated 150-V output of the first LLC SRC to become the actual output voltage. Under region-2 operations, the half-bridge LLC SRC can achieve zero-voltage switching (ZVS) at primary side and zero-current switching (ZCS) at secondary side. The switching losses can thus be reduced significantly and the overall efficiency can be improved. Moreover, due to interleaved operation, the current stress and ripple of the input capacitor can be effectively decreased. Finally, a 2.1-kW laboratory prototype for the studied high-efficiency vehicular DC charger is built and tested to verify the feasibility of the proposed scheme. According to the experimental results, from half load to full load, the efficiencies can be up to 92% and 95 % at 200-V output and 420-V output, respectively.
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