臺灣博碩士論文加值系統

諧振轉換器可有效降低切換損失、提高效率，廣泛應用在隔離式直流-直流電能轉換，本文提出兩個諧振轉換器分別用於直流-直流降壓與升壓隔離式電能轉換之應用。
降壓型隔離式諧振轉換器由一半橋逆變器、一高頻變壓器、一LC諧振電路與一整流器組成，一次側半橋逆變器做切換產生高頻方波電壓， LC諧振電路使電路產生諧振，將高頻方波電壓轉換成類弦波電流，使半橋逆變器之功率開關達到零電壓切換及整流器之二極體達到零電流切換，可降低功率開關切換損失及二極體之反向恢復損失，在整流器中加入電壓控制電路，根據電壓控制電路之功率開關導通時間可調節輸出電壓/電流以對電池組做定電壓/定電流充電。本文並建立一硬體雛型將200V輸入電壓轉換成40V至 56V輸出電壓，對蓄電池組充電以驗證降壓型隔離式諧振轉換器之性能。
升壓型隔離式諧振轉換器由一全橋逆變器、一高頻變壓器、一LC諧振電路與一無橋式整流器組成，藉由LC諧振電路產生諧振，一次側與二次側功率開關可達到零電壓切換、二次側之二極體可達到零電流切換，以有效降低功率半導體元件之切換損耗，二次側之無橋式整流器可以在變動的輸入電池電壓下產生固定輸出電壓。本文並建立一硬體雛型將由電池組提供之40V至56V輸入電壓轉換成200V輸出電壓，以驗證升壓型隔離式諧振轉換器之性能。

Due to the reduced switching loss and improved efficiency, resonant converters are widely used in the applications of isolated DC-DC power conversion. In this thesis, two resonant converters are proposed for DC-DC buck and boost isolated energy conversion applications.
The buck isolated resonant converter is composed of a half-bridge inverter, a high-frequency transformer, an LC resonant circuit and a rectifier circuit. The half-bridge inverter of primary side is switched to generate a high-frequency square-wave voltage. The LC resonant circuit makes the circuit resonate and converts the high-frequency square-wave voltage into a quasi-sinusoidal current. As a result, the power electronic switches of half-bridge inverter can achieve zero-voltage switching and the diodes of rectifier circuit can achieve zero-current switching, which can reduce the switching loss of the power electronic switches and the reverse recovery loss of the diodes. A voltage regulation circuit is added to the rectifier, and the output voltage/current can be adjusted according to the duty of the power electronic switches of the voltage regulation circuit to charge the battery set with constant voltage/constant current. A hardware prototype is built to convert the input voltage of 200V to an output voltage in the 40V - 56V range to charge the battery set to verify the performance of the buck isolated resonant converter.
The boost isolated resonant converter is composed of a full-bridge inverter, a high-frequency transformer, an LC resonant circuit and a full-bridge boost rectifier. The resonant circuit makes the circuit resonate. Consequently, the power electronic switches of the primary side and the secondary side can achieve zero-voltage switching, and the diodes of the secondary side can achieve zero-current switching. As a result, the switching losses of the power semiconductor components can be effectively reduced. The full-bridge boost rectifier on the secondary side can regulate the output voltage with variation in the input voltage of battery set. A hardware prototype is completed to convert the input voltage of battery set in the 40V - 56V range to an output voltage of 200V to verify the performance of the boost isolated resonant converter

摘要 i
ABSTRACT ii
誌謝 iii
目錄 iv
圖目錄 vi
表目錄 xiii
第一章 緒論 1
1-1前言 1
1-2研究動機與目的 2
1-3論文大綱 4
第二章 諧振式轉換器 5
2-1 功率半導體元件之切換損失[22] 5
2-1-1二極體反向恢復電流 5
2-1-2 功率開關元件之切換損失 7
2-2 柔切技術 7
2-2-1 零電壓切換(Zero Voltage Switching, ZVS) 8
2-2-2 零電流切換(Zero Current Switching, ZCS) 9
2-3 LLC諧振轉換器之工作原理 9
2-3-1 R-L-C串聯諧振電路 10
2-3-2 半橋式LLC諧振轉換器[26-28] 11
2-3-3 全橋式LLC諧振轉換器[30-32] 13
2.4 輸出電壓控制 15
第三章 隔離式諧振轉換器 17
3-1降壓型隔離式諧振轉換器 17
3-1-1 操作模式 18
3-1-2 設計考量 30
3-1-3 控制電路 34
3-2升壓型隔離式諧振轉換器 36
3-2-1 操作模式 37
3-2-2設計考量 47
3-2-3 控制電路 51
第四章 模擬結果 53
4-1 降壓型隔離式諧振轉換器 53
4-1-1 性能模擬結果 54
4-1-2 電路損耗模擬 61
4-2 升壓型隔離式諧振轉換器 65
4-2-1 性能模擬結果 66
4-2-2 電路損耗模擬 74
第五章 實驗結果與討論 78
5-1 降壓型隔離式諧振轉換器 78
5-1-1 輸出電壓40V之測試 80
5-1-2 輸出電壓48V之測試 84
5-1-3 輸出電壓56V之測試 88
5-1-4 電池充電測試 92
5-2 升壓型隔離式諧振轉換器 93
5-2-1 輸入電壓40V時之測試 95
5-2-2 輸入電壓48V時之測試 98
5-2-3 輸入電壓56V時之測試 101
第六章 結論與未來展望 105
6-1結論 105
6-2未來展望 106
參考資料 107

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