本論文提出並研製一套應用於無人飛行載具之整合式起動馬達發電機之電能轉換器系統，此系統以雙電能轉換器架構為基礎，藉由三相全橋換流器驅動馬達以起動引擎，再於引擎起動並穩定運轉後，由整流模組與降壓型轉換器以低電壓供給重要航電儀器電能作為飛航之用。控制電路方面以微控制器實現全數位控制，大幅提升系統可靠度並減少電路體積，更提供系統未來擴充彈性。本研究於馬達驅動控制當中加入引擎重新起動邏輯，可自動監測引擎轉速並於轉速低於設定值時重新起動引擎，避免引擎熄火情況發生，同時加入系統保護機制，以確保電能轉換器正常運作。本文針對推導電路模型與分析，並經由電腦模擬與雛形系統實際測試，驗證本論文所提架構確具馬達驅動與降壓穩定供電之功能，研製成果應已具備參考與實用生產價值。

This thesis proposes a power conversion system of a permanent-magnet brushless DC integrated starter-generator for unmanned aerial vehicles. This system is constructed based on two power converters. A three-phase inverter is used as the motor driver to start the engine. After the engine is steady, a rectifier module with a buck converter is used to convert the generator power into low-voltage electricity to supply the critical loads on board. With the aid of microcontrollers, full digital controller can be accomplished and the system stability can be enhanced. This also significantly reduces the circuitry size and provides upgrade flexibility. Meanwhile, the restart logic and protect circuit are embedded in the controller to supervise the engine speed and to restart engine when it goes below a prescribed value to avoid failure. From the presented mathematical derivation, simulations and experimental results, the proposed approach and its feasibility are effectively verified.

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