摘 要 整合脈波寬度調變控制與溫度感測控制的先進的控制技術相對於目前傳統的電壓控制、溫度感測控制及脈波寬度調變控制等方式,可更容易讓風扇達到所需求之轉速,並藉由系統的快速靈敏判斷感測溫度以及時送出適當脈波寬度調變之訊號,提高或降低轉速,來達到節能和降低噪音的效果,藉此改善風扇轉速過高或過低時所造成的多餘損耗。 本篇論文提出將脈波寬度調變控制與溫度感測控制整合應用於驅動直流風扇無刷馬達。利用此技術來控制轉速範圍,即可達到節能效果並且降低噪音。藉由改變輸入脈波寬度調變(PWM)的控制,產生出0%~100%的輸出訊號進而控制風扇轉速。實際將此技術應用在系統待機控制模式狀態下,結果顯示可讓系統達到最佳化的特性及節能效果。因此,結合數位邏輯控制與脈波寬度調變控制,可利用多段轉速的方式來控制系統。例如,當脈波寬度調變的工作週期設定在0~20%的時侯,可以在任何溫度下,藉由固定一個較低的轉速讓系統達到高效能、低噪音之最佳化控制。如系統溫度超過系統所設定之額定值時,則需利用增加風扇轉速此方式來達到其解熱效果。因此,系統將會利用提高脈波寬度調變之訊號來達到增加轉速之需求。 最後,本文已進行實做、測試並完成整合脈波寬度調變控制與溫度控制的應用。根據所設計的電路進行量測,實驗結果所得到之數據及曲線可證實此方法足以讓系統在運作中達到最佳化效能及低噪音。此技術將可廣泛的運用在風扇驅動上並達到最佳的效果。
Abstract The combination of pulse width modulation and temperature sensing control is a new method to control fan speed. Comparing with traditional voltage control, temperature sensing control and the pulse width modulation control, it can meet the system’s speed requirement much easier and increase or reduce the speed according to save energy and reduce the noise by quickly temperature sensing and suitable pulse width modulation signal. It also can improve non-effective attrition at higher or lower speed. This paper points out the combination of Pulse width modulation and temperature sensing control in applying to DC FAN and Brushless driving motor. It can save energy and reduce the noise. In IDLE mode, it can get the best efficiency control and save energy. Therefore, combining the digital logic control and pulse width modulation can meet the multi-stage speed control requirement. When setting the pulse width modulation at duty ratio of 0~20%, it can achieve a better performance and lower noise at any temperature. In conclusion, the paper presents the testing data of 2 samples according to the new control method and it shows the result is quite satisfied.