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壓敏電阻,英文MOV(Metal Oxide Varistors),是一種對電壓變化反應靈敏的限壓型浪涌器件。目前市場上應用于低壓電器浪涌保護的壓敏電阻多為氧化鋅為主體材料的壓敏電阻,以氧化鋅為主體,摻雜多種金屬氧化物,采用典型的電子陶瓷工藝制成的多晶半導體陶瓷元器件。
壓(ya)(ya)敏電(dian)(dian)阻(zu)具(ju)有(you)對稱的(de)(de)伏安特性曲(qu)線,流(liu)(liu)過(guo)(guo)MOV的(de)(de)電(dian)(dian)流(liu)(liu)隨MOV兩端電(dian)(dian)壓(ya)(ya)的(de)(de)增(zeng)大呈指數規律(lv)增(zeng)大。應用時(shi),MOV一(yi)般(ban)并(bing)聯(lian)在(zai)電(dian)(dian)路(lu)中,當電(dian)(dian)路(lu)正常(chang)工(gong)作(zuo)(zuo)時(shi),它處(chu)于(yu)(yu)高(gao)(gao)阻(zu)狀態(tai)(tai),不影響電(dian)(dian)路(lu)正常(chang)工(gong)作(zuo)(zuo)。當電(dian)(dian)路(lu)出(chu)現(xian)異(yi)常(chang)瞬(shun)時(shi)過(guo)(guo)電(dian)(dian)壓(ya)(ya) 并(bing)達到其導通電(dian)(dian)壓(ya)(ya)時(shi),MOV迅速由高(gao)(gao)阻(zu)狀態(tai)(tai)變為低阻(zu)狀態(tai)(tai),泄放由異(yi)常(chang)瞬(shun)時(shi)過(guo)(guo)電(dian)(dian)壓(ya)(ya)導致的(de)(de)瞬(shun)時(shi)過(guo)(guo)電(dian)(dian)流(liu)(liu),同時(shi) 把異(yi)常(chang)瞬(shun)態(tai)(tai)過(guo)(guo)壓(ya)(ya)鉗制在(zai)一(yi)個安全水平之內,從而保(bao)護后級電(dian)(dian)路(lu)免遭異(yi)常(chang)瞬(shun)時(shi)過(guo)(guo)電(dian)(dian)壓(ya)(ya)的(de)(de)損(sun)壞。MOV具(ju)有(you)較高(gao)(gao)的(de)(de)瞬(shun)時(shi)脈沖吸收(shou) 能(neng)力(li),電(dian)(dian)容量較大,一(yi)般(ban)應用于(yu)(yu)AC 交流(liu)(liu)輸入端防雷保(bao)護。由于(yu)(yu)壓(ya)(ya)敏電(dian)(dian)阻(zu)的(de)(de)電(dian)(dian)涌(yong)吸收(shou)能(neng)力(li)取決于(yu)(yu)它的(de)(de)物理尺寸(cun),可通過(guo)(guo)定制制造(zao)不同大小的(de)(de)MOV而獲得不同的(de)(de)瞬(shun)態(tai)(tai)浪涌(yong)電(dian)(dian)流(liu)(liu)值。