摘 要

應用耦合電感、主動式箝位、堆疊電容與交錯式等技術，本論文提出一個具有開關零電壓導通與二極體零電流截止的新型高升壓電路。由於結合各技術的優點，此電路擁有較高的升壓比、效率來符合再生能源需要的特性。並利用交錯並聯技術來提高整個電路的容量。
此電路的核心精神為軟切換操作，於穩態工作時，電路耦合電感的漏感會與兩顆二次側電容諧振。在不同的諧振頻率下，部分功率開關和整流二極體將分別實現零電壓導通和零電流截止。故開關損耗和反向恢復問題會有所降低，進而提高了轉換器的效率。並且引進交錯並聯技術，其每一顆耦合電感的匝數比可以削減，且一次側的電流應力也會降低，故可提高電路整體容量。
於文中，電路穩態特性如升壓比、功率元件承受耐壓耐流與漣波比例均進行了詳細的推導，並和現有的電路進行了比較。另外，並描繪了邊界圖區分軟開關的不同操作模式，爾後通過軟體模擬進行了驗證。最後，基於控制器TMDSDOCK28035的電路原型，操作於24 V輸入電壓、400 V輸出電壓、800 W輸出功率，用以驗證所提轉換器之可行性，在450W時擁有最高效率95.6%。

ABSTRACT

This thesis proposes a novel high step-up DC-DC converter with ZVS turn-on switches and ZCS turn-off diodes based on several existed techniques such as coupled-inductor, active clamping, stacked capacitor and interleaved technique. The proposed converter has a high conversion ratio, and high efficiency to meet the properties of renewable energy needs. Interleaved technique is used here in order to increase the capacity of circuit.
The main objective of proposed circuit is soft-switching operation. The leakage inductance of coupled inductors resonates with two secondary-side capacitors during steady-state operating modes. When the converter is operated at different resonant frequencies, ZVS turn-on and ZCS turn-off can be respectively accomplished by some power switches and rectifying diodes. Then, the problems of switching loss and reverse recovery are mitigated and thus improve the efficiency of proposed converter. Besides, by applying interleaved technology, turns ratio of each coupled inductor can be reduced signifcantly, and current stress at primary-side winding is also decreased. Therefore, the capacity of circuit can be increased obviously.
In the thesis, the steady-state characterisitcs, such as high step up voltage gain, voltage and current stress on the power components, and ripple ratio, are derived and compared with the conventional circuits. Border maps for different operating modes of soft-switching are also illustrated. Verification is done by software simulation. Lastly, by using controller TMDSDOCK28035, a circuit with 24V input voltage, 400V output voltage and 800W output power is implemented to prove the feasibility of proposed converter. The highest efficiency is around 95.6% when operating at 450W.

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