電供 風扇停轉 你是哪一派? 負載/溫度 - 3C
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By Irma
at 2022-02-26T10:42
at 2022-02-26T10:42
Table of Contents
(原文被狼啃光)
關於風扇是否要低負載/低溫停轉,在下是比較推薦維持低速運轉,至少有氣流流動
因為即使高轉換效率,於低負載下仍會產生些許廢熱,
加上目前機殼多採電源下置,設有獨立進風口時不會參與機殼對流,
無法透過機殼正壓進風把氣流從電源出風口擠出去,容易造成熱量累積
所以在下較推薦選擇維持低速運轉或是有切換開關的設計,
除非是其他配備已經安靜到電源風扇成為主要噪音來源,
或是機殼正壓進風可以將部分氣流從電源出風口擠出去,再考慮使用停轉功能
目前電源風扇控制機制大多是透過熱敏電阻,偵測電源主變壓器/二次側等較熱區域
溫度低時供應電壓低於風扇啟動電壓,這時風扇就會停止或是偶爾抖一下(無法順利啟動)
當溫度上升到一個程度後,就調整風扇電壓,使其開始啟動運轉,並隨溫度提高電壓
目前改進的機制則是添加微控制器,使風扇變化曲線更精細,增加停轉偵測判讀條件
或是設置多測溫頭,在電源其他位置偵測溫度,並列入條件參考
有些使用DSC(數位信號控制器)的電源,會搭配PWM風扇,
風扇運轉規則及轉速曲線則完全由DSC內部程式去控制,溫度及負載量都會列入參考
--
關於風扇是否要低負載/低溫停轉,在下是比較推薦維持低速運轉,至少有氣流流動
因為即使高轉換效率,於低負載下仍會產生些許廢熱,
加上目前機殼多採電源下置,設有獨立進風口時不會參與機殼對流,
無法透過機殼正壓進風把氣流從電源出風口擠出去,容易造成熱量累積
所以在下較推薦選擇維持低速運轉或是有切換開關的設計,
除非是其他配備已經安靜到電源風扇成為主要噪音來源,
或是機殼正壓進風可以將部分氣流從電源出風口擠出去,再考慮使用停轉功能
目前電源風扇控制機制大多是透過熱敏電阻,偵測電源主變壓器/二次側等較熱區域
溫度低時供應電壓低於風扇啟動電壓,這時風扇就會停止或是偶爾抖一下(無法順利啟動)
當溫度上升到一個程度後,就調整風扇電壓,使其開始啟動運轉,並隨溫度提高電壓
目前改進的機制則是添加微控制器,使風扇變化曲線更精細,增加停轉偵測判讀條件
或是設置多測溫頭,在電源其他位置偵測溫度,並列入條件參考
有些使用DSC(數位信號控制器)的電源,會搭配PWM風扇,
風扇運轉規則及轉速曲線則完全由DSC內部程式去控制,溫度及負載量都會列入參考
--
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