本文提出將脈波寬度調變控制與溫度感測控制整合應用於直流風扇馬
達的驅動系統，藉由結合這兩種控制可讓系統在廣範圍內達到及降低噪音
的效果，以改變脈波寬度來產生0%~100%的輸出，而實際應用在系統待機
模式下 (IDLE) 做最佳化效能控制及節能。採用數位邏輯控制與脈波寬度
調變整合達到多段轉速控制目的，當脈波寬度調變的工作週期為0~20%
時，可以在任何溫度下固定一個較低轉速以達到高效能、低噪音之最佳化
控制，如系統溫度超過設定值時為達到其解熱效果，則以提高轉速來滿足
散熱需求。本文已完成實現脈波寬度調變與溫度控制結合應用的設計。根
據實驗的結果，證實將此兩種控制結合確可達到預期效果。

This paper proposes a design of integrating the pulse width modulation and temperature sensing control for DC fan driving, which can save energy and reduce the noise in a wide speed range. In the IDLE mode, it will do the best efficiency control and save energy. By combing digital logic control with pulse width modulation, the control of multi-stage speeds setting requirement can be reached. For example, when duty ratio is between 0 and 20%, it has the best control for high performance and low noise to set up the lowest flat speed under any temperatures. It will increase the fan speed to transpire the thermal heat when the temperature of the system is over the set point. According to the test results,
this design has been verified to reach the purpose of energy saving and noise reducing.