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if (JS_ChkReg(keyWords, "^[中文\\w][中文\\w\\-\\+\\(\\)\\,，、]*$") == false) { if (keyWords == "") { alert("請輸入搜索關鍵詞！"); } else { alert("查找關鍵字只能是中文或者英文數字"); } $("#keyword").focus(); return false; } else { return true; } }); </script> <div class="publicWidth pageLocation"> <a href="/" class="title1">首頁</a> >><a href="/list/?167.html">NF社區</a> >><a href="/list/?262_1.html">行業快訊</a> </div> <div class="publicWidth articleDetails"> <h1 id="article-title"> 鐵電爐溫控器主要特點 </h1> <div class="inforArticle"> <span class="author"> <strong>作者：</strong>?？滤? <strong>來源：</strong>網絡 <strong>發布：</strong> 2014-7-30 10:01:53 </span> <span class="fontsize">[<a href="javascript:articleSize('16','30')">大</a>] [<a href="javascript:articleSize('14','24')">中</a>] [<a href="javascript:articleSize('12','21')">小</a>]</span> </div> <div id="article" class="word"> 鐵電爐溫控器主要工作原理U2雙555(NE556）定時電路與U3及外圍元件構成主控制電路；U1（光耦）、U4(TWH8778）與小型面板數字電子鐘一起構成定時開機電路；U5和壓電蜂鳴器等構成聲光報警電路；由U8、U9與兩個U形磁芯組成磁檢測過電流保護電路；U7提供＋9V工作電源。設數顯表的下限溫度為T1（如800)，上限溫度為T2（如806）。鐵電爐溫控器主要特點1．可配接多種分度號溫度傳感器；2．具有霍耳過流、短路二重保護功能；3．具有聲光到溫及過流報警提醒功能；4．具有24小時內任意定時開機功能；5．具有開機軟啟動及自動定時預熱功能；6．具有二種加熱狀態，溫度波動較小。接通交流電源開關K0開機后，直流＋9V建立，電源指示燈場點亮，數顯表通電工作，在自檢完成后，其下限報警開關ALI接通、上限報警開關ALZ斷開。接通面板加熱開關K1開始加熱后，面板指示燈L1點亮，電路各部分開始工作。UZ左半邊555構成巧分鐘預熱定時控制，定時時間由C1和R2決定。定時開始后，輸出（⑤腳）為低電平，D1截止，不起控制作用。U2右半邊555構成受控多諧振蕩電路，輸出⑨腳的高電平（充電）時間由R5和R6和C3決定，低電平（放電）時間由R6、R7、C5、C3決定。過零觸發器U3在U2⑨腳為高電平時截止，為低電平時導通。U3導通時，綠色電流指示燈12點亮，可控硅SCR導通工作，電爐通過空氣開關KK得電加熱。U3截止時，SCR關斷，加熱停止。由于剛開始時C3的充電時間長(R5+R6*C3）、放電時間短（C5未充電時R6//R7*C3)，所以電爐得電時間短，斷電時間長，電爐以小功率開始預熱。隨著CS的充電，R7的放電作用逐漸消失，C3的放電時間（R6*C3）逐漸增加，使電爐得電時間也逐漸增加，預熱功率漸漸加大，通過這一過程，電爐就實現了從小功率到中功率平穩過渡的軟啟動。當電爐預熱定時時間（巧分）到達之后，U2左邊555的輸出端⑤腳變成高電平，D1導通，將U2⑧、⑩腳置為高電平，使得其輸出⑨腳保持低電平。U3導通，使可控硅SCR保持在長導通狀態，因此，電爐自動定時預熱過程結束，進人全功率加熱快速升溫狀態。當電爐的溫度升至下限溫度T1后，數顯表下限報警接點AL1斷開，U2④腳失去正電源，通過Rl、R27變成低電平。⑤腳也變為低電平，Dl截止，解除了對U2⑧腳、⑩腳的控制，U2右半邊555進人多諧振蕩狀態，電爐也進人間斷加熱的保溫狀態（如果此時面板提醒開關K3處于接通狀態，US左邊兩個或非門工作，面板提示燈L7閃爍，US右邊兩個或非門控制端⑧腳通過D5得到高電平開始工作，蜂鳴器間斷發聲提示用戶溫度已到。如K3斷開，蜂鳴器停止發聲）。如果在該溫度點的保溫功率不足以維持電爐的散熱，電爐溫度將逐漸下降，當溫度低于下限溫度T1之后，AL1重新接通，電爐再次進人全功率的加熱狀態。如果在此溫度點的保溫功率足夠大，電爐的溫度將會逐漸升高，當超過設定的上限溫度咒后，上限報警接點AL2轉人接通狀態，此時U3的電源因被AL2短路處于關斷狀態，可控硅SCR截止，電爐停止加熱。 <script src="/inc/AspCms_VisitsAdd.asp?id=2127"></script> </div> <div id="C_wechat_link" style="display: none;"></div> <iframe style="display: none;width:100%;border-width: 0;overflow: hidden;" id="iFrame" width="100%"></iframe> <script> function getUrl(URL) { let http = (window.location.protocol === 'http:' ? 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