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MOSFETS </a> </div> </div> <div class="rig_con"> <div class="top"> <h1 class="title"> NTC熱敏電阻在電源電路中的作用 </h1> <div class="meg"> <div class="firsts">發布時間：2021-08-03</div> <div class="">已被瀏覽：<span>2965</span>次</div> <div class="shape"> <span>分享到：</span> <div class="bdsharebuttonbox" style="display:inline-block;vertical-align:middle;"><a href="#" class="bds_more" data-cmd="more"></a><a href="#" class="bds_qzone" data-cmd="qzone" title="分享到QQ空間"></a><a href="#" class="bds_tsina" data-cmd="tsina" title="分享到新浪微博"></a><a href="#" class="bds_sqq" data-cmd="sqq" title="分享到QQ好友"></a><a href="#" class="bds_weixin" data-cmd="weixin" title="分享到微信"></a><a href="#" class="bds_renren" data-cmd="renren" title="分享到人人網"></a></div> <script> window._bd_share_config={"common":{"bdSnsKey":{},"bdText":"","bdMini":"2","bdMiniList":false,"bdPic":"","bdStyle":"0","bdSize":"16"},"share":{}};with(document)0[(getElementsByTagName('head')[0]||body).appendChild(createElement('script')).src='http://bdimg.share.baidu.com/static/api/js/share.js?v=89860593.js?cdnversion='+~(-new Date()/36e5)]; </script> </div> </div> </div> <div class="con"> <span style="font-family:新宋體,arial;"><span style="font-size:16px;"><span style="line-height:200%;">前言：開關電源接通電源時，<a href="http://www.forsakring-online.com/"><span style="color:#FF0000;"><strong>電容器</strong></span></a>的電壓不會突然變化，因此會產生大的充電電流。這個電流是我們常說的輸入浪涌電流，是在最初充電過濾電容器時產生的。這個浪涌電流雖然時間很短，但如果不加以抑制，會減短輸入電容和整流橋的壽命，還可能造成輸入電源電壓的降低，讓使用同一輸入電源的其他動力設備瞬間掉電，對臨近設備的正常工作產生干擾。浪涌電流的抑制方法很多，一般中小功率電源采用電阻限流的方法抑制電源的浪涌電流。以熱敏電阻NTC為例，講述<a href="http://www.forsakring-online.com/products/category-472/"><span style="color:#FF0000;"><strong>NTC熱敏電阻</strong></span></a>在電路中的作用。<br /> <img alt="NTC熱敏電阻在電源電路中的作用" src="/u_file/2104/photo/2104/2021040117492282.jpeg" /><br /> NTC熱敏電阻在電源電路中的作用<br /> （1）測溫<br /> 作為測量溫度的熱敏電阻傳感器一般結構較簡單，價格較低廉。沒有外面保護層的熱敏電阻只能應用在干燥的地方；密封的熱敏電阻不怕濕氣的侵蝕、可以使用在較惡劣的環境下。由于熱敏電阻傳感器的阻值較大，故其連接導線的電阻和接觸電阻可以忽略，因此熱敏電阻傳感器可以在長達幾千米的遠距離測量溫度中應用，測量電路多采用橋路。<br /> <br /> （2）溫度補償<br /> 熱敏電阻傳感器可在一定的溫度范圍內對某些元器件溫度進行補償。例如，動圈式儀表表頭中的動圈由銅線繞制而成，溫度升高，電阻增大，引起溫度的誤差。因而可以在動圈的回路中將負溫度系數的熱敏電阻與錳銅絲電阻并聯后再與被補償元器件串聯，從而抵消由于溫度變化所產生的誤差。<br /> <br /> （3）過熱保護<br /> 過熱保護分直接保護和間接保護。對小電流場合，可把熱敏電阻傳感器直接串入負載中，防止過熱損壞以保護器件，對大電流場合，可用于對繼電器、晶體管電路等的保護。<br /> <br /> （4）液面測量<br /> 給NTC熱敏電阻傳感器施加一定的加熱電流，它的表面溫度將高于周圍的空氣溫度，此時它的阻值較小。當液面高于它的安裝高度時，液體將帶走它的熱量，使之溫度下降、阻值升高。判斷它的阻值變化，就可以知道液面是否低于設定值。汽車油箱中的油位報警傳感器就是利用以上原理制作的。<br /> <br /> 以上內容主要介紹NTC熱敏電阻在電源電路中的作用，如需要NTC熱敏電阻相關產品請留言聯系或<span style="color:#FF0000;">撥打：0755-28100016；</span>海量NTC熱敏電阻現貨庫存，規格齊全。歡迎來咨詢價格或拿樣測試。<br /> <br /> 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