壓敏電(dian)(dian)(dian)阻是(shi)在一(yi)定電(dian)(dian)(dian)流(liu)電(dian)(dian)(dian)壓范(fan)圍內電(dian)(dian)(dian)阻值隨電(dian)(dian)(dian)壓而(er)變的電(dian)(dian)(dian)阻，或者說是(shi)"電(dian)(dian)(dian)阻值對電(dian)(dian)(dian)壓敏感"的阻器(qi)，簡寫為VDR。它被廣泛的應用(yong)在電(dian)(dian)(dian)子線路中(zhong)，來防(fang)護(hu)因為電(dian)(dian)(dian)力供應系統的瞬時電(dian)(dian)(dian)壓突變所可能對電(dian)(dian)(dian)路的傷害。也(ye)是(shi)電(dian)(dian)(dian)源(yuan)適配器(qi)重要的元器(qi)件之一(yi)，今(jin)天(tian)充電(dian)(dian)(dian)器(qi)廠家(jia)就來和大(da)家(jia)談一(yi)下壓敏電(dian)(dian)(dian)阻器(qi)在電(dian)(dian)(dian)源(yuan)適配器(qi)里起到什么樣(yang)的作用(yong)。

壓敏電阻器的(de)主要特點是(shi)工(gong)作電壓范圍寬(kuan)(6～3000V，分(fen)若干(gan)檔)，對過壓脈沖響應快(納秒級)，耐沖擊電流的(de)能(neng)力強(100～2000A)，漏電流小(xiao)(微安(an)級)，電阻溫度系數小(xiao)，性(xing)優(you)價廉(lian)，體積小(xiao)，是(shi)一(yi)種理想的(de)保(bao)護(hu)元件，可以構成過壓保(bao)護(hu)電路、消噪電路、消火(huo)花電路、吸收回(hui)路。

在(zai)(zai)供電網絡疊加有(you)過(guo)電壓脈沖(chong)(chong)時，接壓敏(min)電阻后，過(guo)電壓峰值波(bo)形削平，限(xian)制在(zai)(zai)一(yi)定的幅度內。在(zai)(zai)開(kai)(kai)啟或關(guan)閉帶有(you)感性(xing)、容性(xing)的負(fu)載電路時，直(zhi)流波(bo)形出現開(kai)(kai)關(guan)尖脈沖(chong)(chong)，壓敏(min)電阻在(zai)(zai)電路中能吸收這種反電功勢，從而有(you)效的保(bao)護開(kai)(kai)關(guan)電路不受損害

壓(ya)敏電(dian)(dian)(dian)(dian)阻器可以用來代替瞬(shun)態抑制二(er)級(ji)管、齊納二(er)級(ji)管和電(dian)(dian)(dian)(dian)容器的組合。并對(dui)(dui)集成(cheng)電(dian)(dian)(dian)(dian)路等(deng)重要元件以及其(qi)他(ta)(ta)電(dian)(dian)(dian)(dian)路和設(she)備進行保(bao)護，防止因靜電(dian)(dian)(dian)(dian)放電(dian)(dian)(dian)(dian)、浪(lang)涌(yong)及其(qi)他(ta)(ta)瞬(shun)態電(dian)(dian)(dian)(dian)流(如雷擊(ji)等(deng))而造成(cheng)對(dui)(dui)它們(men)的損壞。

使用(yong)時只需要(yao)將(jiang)壓敏電(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)器(qi)并接(jie)于被保護的電(dian)(dian)(dian)路(lu)上(shang)，當電(dian)(dian)(dian)壓瞬間(jian)高于某一數值時，壓敏電(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)器(qi)阻(zu)(zu)(zu)(zu)值迅(xun)速下(xia)降，導通大(da)電(dian)(dian)(dian)流，阻(zu)(zu)(zu)(zu)止瞬間(jian)過壓而起到(dao)保護作用(yong)，當電(dian)(dian)(dian)壓低于壓敏電(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)器(qi)工作電(dian)(dian)(dian)壓時，壓敏電(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)器(qi)阻(zu)(zu)(zu)(zu)值極高，近乎開(kai)路(lu)，所以不會(hui)影響器(qi)件或(huo)電(dian)(dian)(dian)氣設備的正常工作。

雖然壓(ya)敏(min)電(dian)阻可以(yi)保護(hu)(hu)電(dian)路但是(shi)它所能承(cheng)受的能量或功(gong)率是(shi)有限，不能提供持續性的過電(dian)壓(ya)保護(hu)(hu)。持續的過電(dian)壓(ya)會破壞保護(hu)(hu)裝(zhuang)置(壓(ya)敏(min)電(dian)阻)，并(bing)對設備(bei)造(zao)成(cheng)損害(hai)，并(bing)可能有著火的危險。

關于(yu)壓敏電阻器的作用(yong)，充電器廠(chang)家今天(tian)就先和(he)大(da)家分(fen)享(xiang)到這里(li)，感謝大(da)家的閱讀與關注。