本論文係探討轉速迴授式單相無刷直流風扇控制及驅動方式之改良對策及其實現。有鑑於目前市場上應用於桌上型電腦、手提電腦、工業電腦、伺服器等之無刷直流風扇傳統控制方式效率不佳及其安全性仍隱藏著隱憂而作全面改善。本文將提出新的控制方式排除風扇於運轉中之可能發的危險性，並以8位元微處理器取代傳統驅動IC控制其轉速、電流穏定度、效率及其安全性處理，並使其控制方式更彈性化。而為了使驅動風扇馬達之PWM輸出波型更即時且更精準，本文所使用之微處理器程式語言將以組合語言編寫。此外，以微處理器控制搭配轉速回授方式更能減少因系統老化及電源電壓不穏造成轉速下降所帶來的惡性循環。最後藉由實驗結果來驗證所提出之新式控制方式將有效改善電流穏定度、效率及其安全性。 This paper is to explore the new control way of single-phase brushless DC fan. It propose countermeasures to improve the fan operating conditions with speed-feedback-control. In consideration of the weakness in current brushless DC fan control way, this paper will present a new control method to exclude the risk that may occur in fan operation. We use an 8bit single chip microcontroller as the alternative solution to control fan speed, current stability, efficiency and safety. In order to make sure the process speed of microcontroller is fast enough to respond to hall signal changing immediately and more precise, we use the Assembly language to coding the microprocessor program. Using a microcontroller to control DC fan is helpful to reduce the riskiness that consist of component aging and unstable power supply. Finally, the new control method can be used to improve the fan efficiency and safety. It will be proved by experimental results.
