臺灣博碩士論文加值系統

本論文主旨為運用整合式變壓器於串聯諧振轉換器輕載效率改善之研究的探討與研製。對於串聯諧振式轉換器來說，由於功率開關元件達到零電壓切換，且因功率元件技術日益成熟之下，此功率元件所能降低的損失已達瓶頸，其餘電路的主要損失來自於磁性元件等部分。因此為了追求高效率與高功率密度，改善磁性元件即成為重要的課題。
整合式變壓器為多顆鐵心做整合後合成單顆鐵心，在多顆鐵心的架構之下能夠將輸入電壓分別跨至多顆鐵心上，使單顆鐵心上的磁通密度降低，進而減少鐵心損失，鐵心也較容易散熱，但因鐵心數量多且總體積大，因此利用磁通抵消的概念，使鐵心可整合成單顆鐵心，亦因整合式變壓器的有效磁路長度與磁阻的關係，使整合式變壓器在相同繞線柱截面積、相同鐵心體積與相同繞線圈數之下，可降低鐵心感值，進而提升諧振槽電流，使電路操作於輕載時更易於達到零電壓切換的條件，以提升輕載效率。最後實作出一台切換頻率為325 kHz、輸入為800 V轉輸出為800 V、而輸出最大功率為7.2 kW的串聯諧振轉換器。

The purpose of this thesis is to develop the research and implementation on the light-load efficiency improvement of series-resonant converters using integrated transformers. For a series-resonant converter, zero-voltage-switching on power switching devices is a common technique; besides, the power devices are increasingly improved on their operation losses. Therefore, further loss reduction on series-resonant converters has reached a bottleneck. In addition to the device losses, the major loss is resulted from the magnetic components. As a result, in order to pursue high efficiency and high power density on this kind of converters, it is an important issue to improve the magnetic components.
The integrated transformer integrates multiple magnetic cores to form a single one. By using an integrated core structure, the input voltage can be shared by the multiple cores to reduce the magnetic flux density on the individual cores, thereby reducing core loss. Furthermore, by elegantly arranging the core placement, the flux cancellation is achieved to reduce the effective magnetic circuit length of the integrated transformer and also the magnetic reluctance. Not only the core loss is further reduced, the integrated transformer can possess a lower magnetizing inductance without increasing the cross-sectional area of the transformer and turns number. This feature increases the magnetizing current, making it easier for the circuit to achieve zero-voltage switching under light-load conditions. Another advantageous feature to mention is that the distributively placed windings gain more space to dissipate the generated heat and lower the transformer temperature. A series-resonant converter with a switching frequency of 325 kHz, 800 V on both input and output, and maximum load of 7.2 kW is implemented.

第一章 緒論
1.1 研究動機與目的
1.2 論文大綱
第二章 串聯諧振式轉換器
2.1 理想R-L-C串聯諧振電路
2.2 全橋串聯諧振式轉換器
2.2.1 全橋串聯諧振式轉換器電路動作原理
2.2.2 全橋串聯諧振式轉換器電路動作分析
2.2.3 Region-1與Region-2的特性比較
第三章 整合式變壓器之結構分析與設計
3.1 串聯諧振式變壓器
3.1.1 傳統變壓器之結構
3.1.2 傳統變壓器與整合式變壓器之優缺點
3.2 整合式變壓器
3.2.1 整合式變壓器之發展
3.2.2 整合式變壓器之鐵心整合
3.2.3 整合式變壓器之優化
第四章 模擬與實驗結果
4.1 電路規格與實體鐵心
4.2 電路與鐵心模擬波形
4.3 鐵心與電路實測結果
第五章 結論與未來展望
5.1 結論
5.2 未來展望

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