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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"> 欠壓保護器的工作原理 </h1> <div class="inforArticle"> <span class="author"> <strong>作者：</strong>?？滤? <strong>來源：</strong>網絡 <strong>發布：</strong> 2015-1-14 14:00:00 </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"> <br /> 1.工作電源380V電源經變壓器T降壓，二極管VD14-VD17整流，電容器C15濾波，形成約27V的直流電壓（Vcc），作為線圈電壓為DC24V的繼電器KA的驅動電源。再經三端穩壓器7812穩壓，形成12V穩定電壓，給其他電路供電。<br /> 2.相序與缺相保護三相電源接入電阻R18-R21及電容器C21、C22等元件組成的移相電路，如果相序正確，且沒有缺相現象，則在由二極管VD10-VD13組成的整流器輸人端的矢量電壓較小，整流后的電壓也小，發光管LED3及光7IC2中的二極管電流較小，LED3不能點亮，IC2中的三極管不導通，這時三輸入與非門IC4A的(11)、(12)、(13)腳為低電平，⑥腳為高電平，對其后電路IC4B、IC4C以及繼電器KA不產生影響，保護器的輸出狀態不變，電動機可正常運行。<br /> 如果三相電源相序接錯，或者出現缺相現象，則上述整流輸出電壓升高，發光管LED3點亮，指示相序錯亂或有缺相；同時，IC2中的三極管導通，IC4A的(11)、(12)、(13)腳變為高電平，⑥腳變為低電平，與⑥腳直接連接的⑧腳電位同時變低，根據與非門輸人輸出邏輯關系，IC4B的⑨腳電位變高IC4C的⑩腳電位變低，三極管Q截止，繼龜器KA釋放，保護器呈保護工作狀態。<br /> 3.過壓保護<br /> 由電位器RP2設置過壓保護值，設置范圍為380-460V。當三相電源電壓高于額定值時，ICiC的⑤腳電壓會高于⑥腳（⑥腳電壓由電阻R12,R13分壓決定），這時ICiC的輸出端⑦腳變為高電平，二極管VD8截止，電容器C9經電位器RN和電阻R17充電，充電使ICID的②腳電壓高于電阻R12,R13分壓決定的③腳電壓時，ICID的輸出端①腳電位變低，之后經IC4B和IC4C使保護器進人保護工作狀態。<br /> 過壓保護的延時時間，即過電壓允許的持續時間可由RP4調整，設定范圍為0.5-V5s。當三相電源電壓在正常范圍時，ICiC的⑦腳為低電平，二極管VD8導通，電容器C9不能充電，保護器處于正常工作狀態。<br /> 4．欠壓保護保護器接人應用電路后，其A,B,C三相接線端子上即獲得了380V電源，經二極管VD1--VD6整流，電容器C1濾波，在C1兩端生成相應的直流電壓。該電壓經電阻R6,R7和電位器RPl分壓，并由RPI設置欠壓保護值，欠壓保護設置范圍為300V-380V，設置電壓加在運算放大器IClA(LM324，這里作電壓比較器用)的⑨腳，與⑩腳電壓（由電阻R8和R9對IC4A的⑥腳電壓分壓決定）進行比較。當⑨腳電壓因為三相電源電壓降低而低于⑩腳電壓時，IC1A的輸出端⑧腳電位變高，這時二極管VD7截止，電容器C5經電位器RP3和電阻R11充電，充電電壓使IClB的（13）腳電壓高于電阻R12,R13分壓決定的（12）腳電壓時，IC1B的輸出端（14）腳電位變低，之后經IC4B和IC4C使保護器進人保護工作狀態。<br /> 調整電位器RP3，可改變C5充電速度，因此，RP3是欠壓保護的延時調整元件，延時時間可在1s~10s間調整。當三相電源電壓在正常范圍時，ICIA的⑧腳為低電平，二極管VD7導通，電容器C5經VD7和ICIA的⑧腳放電，因此不能充電，保護器處于正常工作狀態。<br /><br /><script src="/inc/AspCms_VisitsAdd.asp?id=2271"></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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