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font-family: " microsoft="" lucida="" font-size:="" text-indent:="" white-space:=""/><span style="color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="">　　</span><a href="http://www.003lm.com/search.asp?keys=%E6%B8%A9%E5%BA%A6%E6%8E%A7%E5%88%B6%E7%B3%BB%E7%BB%9F" target="_blank"><span style="text-decoration-line: underline; font-weight: 600; color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="">溫度控制系統</span></a><span style="color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="">已有很多。本文介紹一種可控制三速風扇的微型</span><a href="http://www.003lm.com/" style="text-decoration-line: none; color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="" white-space:="">溫度控制器</a><span style="color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="">。將一個開關模式的DC-DC轉換器與兩片溫度檢測器相結合,可構成一個三速風扇控制器,該電路可用于計算機、溫度控制器、報警系統等方面,具有降低噪聲、節省功耗等功能。</span><br style="color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="" white-space:=""/><span style="color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="">　　</span><br style="color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="" white-space:=""/><span style="color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="">　　2、電路</span><br style="color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="" white-space:=""/><span style="color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="">　　應用電路如圖1所示,其中IC3為DC-DC開關轉換器,具有邏輯可控的關斷功能以及輸出驅動能力。利用邏輯電平控制3/5、關斷輸入端(CUT),并選擇適當的反饋電阻R2、R3,將輸出電壓設置為0V、8V、12V,每次輸出一種電壓,可控制風扇的三種速度。較低輸出電壓(VOUT1,8V)由R2/R3分壓比決定,較高輸出電壓(VOUT2,12V)由VOUT1 和內部分壓比決定:</span><br style="color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="" white-space:=""/><span style="color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="">　　VOUT1=3.3[(R2+R3)/R3]</span><br style="color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="" white-space:=""/><span style="color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="">　　VOUT2=VOUT1(5/3.3)</span><br style="color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="" white-space:=""/><span style="color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="">　　溫度監視器IC1、IC2的漏極開路輸出,在環境溫度超過預設的門限后輸出低電平,低于預設門限時輸出高電平。監視器為SOT23-5封裝,具有+35℃至+115℃范圍內的預定門限。當溫度超出IC2門限值(本例中為+45℃)時,該器件輸出的低電平使IC3的關斷端為低電平;IC1的輸出為高電平,Q2飽和導通,IC3的3/5輸入端為低電平。此時IC3將在輸出端產生3.3V(到達風扇的為8V)。當溫度高出+65℃時,IC1也輸出低電平,此時Q2截止,IC3的3/5輸入端為高電平,為風扇提供12V電壓。當溫度低于+45℃時,IC2輸出高電平,使IC3的關斷端為高電平;IC1輸出高電平,Q2飽和導通,IC3的3/5輸入端為低電平。此時IC3輸出0V。Q2用來作為信號反相,并提供對IC3的3/5輸入端邏輯高電平的適配。</span><br style="color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="" white-space:=""/><span style="color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="">　　IC3的輸出驅動能力極強,1A負載下壓差僅約150mV。轉換效率與輸出電壓無關,但隨輸出電流的變化而改變,對于10mA到1A的電流,變化范圍在85%至96%之間,平均約90%。在比較低的溫度(+45℃以下)下不需要風扇工作,開關穩壓器被關斷,電源電流降至100uA左右。</span><br style="color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="" white-space:=""/><span style="color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="">　　</span><br style="color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="" white-space:=""/><span style="color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="">　　3、結語</span><br style="color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="" white-space:=""/><span style="color: rgb(102, 102, 102); font-family: " microsoft="" lucida="" font-size:="" text-indent:="">　　本文介紹了一種微型溫度控制器,可控制三速風扇,功耗及噪聲均較低,具有較強實用性。</span><br style="color: rgb(102, 102, 102); 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