滌綸電容特點有哪些

突(tu)出優點：薄膜電(dian)容(rong)的精(jing)度、損耗角(jiao)、絕緣(yuan)電(dian)阻、溫度特性、可靠性及適應環境(jing)等指標都優于電(dian)解電(dian)容(rong)，瓷片電(dian)容(rong)兩(liang)種電(dian)容(rong)。

突出缺點：容量價格比及容量體積比都大于以上兩種電容。

用途：在各種直流或中低頻脈動(dong)電路中使(shi)用。適宜作為旁路電容使(shi)用。

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容值范圍：470pF~4.7μF。

額(e)定電壓(ya)范(fan)圍：63-630V。

損耗角(jiao)正切：0.3-0.7。

工作溫(wen)度：-55℃到125℃。

溫(wen)度系數：+200 +600ppm。

常見分(fen)類：跟很(hen)多電(dian)(dian)容(rong)一(yi)樣，滌綸電(dian)(dian)容(rong)還有(you)很(hen)多細小的(de)分(fen)類，比如(ru)常見的(de)CL11，CL21；區別在于CL21電(dian)(dian)容(rong)內壁采(cai)用金屬化技術(shu)，體積較CL11小很(hen)多，但整體性(xing)能不如(ru)CL11。因此購(gou)買(mai)時(shi)需(xu)要向商家說明，是買(mai)哪(na)一(yi)種。

滌綸電容參數識別

1、國外(wai)電容器耐壓值(zhi)通常(chang)用字母來(lai)表示基(ji)數(shu)，常(chang)見的代碼和(he)基(ji)數(shu)對應(ying)關系(xi)是：

A：1.0；B：1.25；C：1.6；D：2.0；E：2.5；F：3.15；G4.0；

H：5.0；J：6.3；K：8.0；Z：9.0；

字母前面的數表示10的冪，比(bi)如2A，即為102*1.0=100V，2C為102*1.6=160V等等。

耐(nai)壓(ya)值(zhi)后(hou)方的字母(mu)表示電容(rong)(rong)容(rong)(rong)量，單位為(wei)pF。

例如：823表示容(rong)量(liang)為82*10^3=82000Pf ，224表示22*104=220000pf=0.22μF；最(zui)后的字(zi)母表示精(jing)度，比如J表示容(rong)量(liang)允許偏差為±5%等(deng)等(deng)。

典型的(de)電(dian)容標(biao)識示(shi)例(li)：2A823J 即82000Pf±5%，耐壓100V。

2、電容器的參數標注方法

（1） 直標法：將電(dian)容器(qi)的(de)主要參數（標稱容量(liang)、額定電(dian)壓、及允許偏差(cha)）直接標注在電(dian)容器(qi)上，如(ru)0.0047μf/275V，0.0047μf是(shi)容量(liang)，相當于4700Pf，275V應是(shi)耐壓（不屬優選數系列）。

（2） 文字符號法：采用數字或字母與數字混合的方法來標注電容器的主要參數。
1. 數字(zi)標注法 一般是(shi)用3位(wei)數字(zi)表(biao)(biao)示電容器的容量。其(qi)中前兩位(wei)為有(you)(you)效值數字(zi)，第三(san)位(wei)為倍乘(cheng)數（即(ji)表(biao)(biao)示有(you)(you)效值后有(you)(you)多少個0）。如104，表(biao)(biao)示有(you)(you)效值是(shi)10，后面再加4個0，即(ji)100000Pf=0.1μf。

（3）字母與數字混合標注法：用(yong)2—4位數字表(biao)(biao)示(shi)有效值(zhi)，用(yong)P、n、M、μ、G、m等(deng)字母表(biao)(biao)示(shi)有效數后面(mian)的量級。進口電容器在標注數值(zhi)時(shi)不用(yong)小數點，而(er)是將整數部分寫在字母之前，將小數部分寫在字母后面(mian)。如(ru)4P7表(biao)(biao)示(shi)4．7Pf，3m3表(biao)(biao)示(shi)3300μf(3.3mf)等(deng)。

3、電容器的容量的允許偏差標注字母及含義

（1）字母(mu)含(han)義：

F ±1%

G ±2%

J ±5%

K ±10%

M ±20%

N ±30%

如104K表示容量100000Pf=0.1μf，容量允(yun)許偏差為±10%。

（資料來源《通用電(dian)子元器件的選用與檢(jian)測》）

國產電(dian)容器標注可查閱《GB/T 2691-1994 電(dian)阻器和電(dian)容器的標志代碼。

滌綸電容的作用

滌綸(lun)電(dian)(dian)容是電(dian)(dian)子產品中必不可少的一(yi)個基本元(yuan)件(jian)，在電(dian)(dian)路中充當(dang)著濾波、振蕩、電(dian)(dian)源退耦、脈動信號的旁路及耦合等(deng)。

滌綸電(dian)(dian)(dian)(dian)容的(de)(de)最(zui)簡單結(jie)構(gou)可由兩(liang)個金屬板(ban)(ban)中間(jian)(jian)夾(jia)一層絕緣介質組成。在兩(liang)個金屬板(ban)(ban)（極板(ban)(ban)）間(jian)(jian)加一個電(dian)(dian)(dian)(dian)壓(ya)，極板(ban)(ban)就能儲(chu)存(cun)(cun)電(dian)(dian)(dian)(dian)荷(he)。儲(chu)存(cun)(cun)電(dian)(dian)(dian)(dian)荷(he)的(de)(de)大小與極板(ban)(ban)間(jian)(jian)電(dian)(dian)(dian)(dian)壓(ya)與極板(ban)(ban)面(mian)積（容量(liang)）成正比，與極板(ban)(ban)間(jian)(jian)的(de)(de)距離成反比。Q=CV 即(ji)C=Q/V=εS/4πd（《詳見薄(bo)膜電(dian)(dian)(dian)(dian)容器(qi)理論計算及修正》）Q—極板(ban)(ban)上儲(chu)存(cun)(cun)的(de)(de)電(dian)(dian)(dian)(dian)荷(he)；C—電(dian)(dian)(dian)(dian)容器(qi)（PF）；V—極板(ban)(ban)間(jian)(jian)的(de)(de)電(dian)(dian)(dian)(dian)壓(ya)（V）； ε——介質介電(dian)(dian)(dian)(dian)常數（聚(ju)酯膜為3.0，聚(ju)丙烯(xi)膜2.1）； S—金屬極板(ban)(ban)面(mian)積(mm2)； d—極板(ban)(ban)間(jian)(jian)的(de)(de)距離(mm)。

滌綸電容的種類

1、按其可調節性分

可(ke)分為固定(ding)電(dian)(dian)容器(qi)、微調電(dian)(dian)容器(qi)、可(ke)變電(dian)(dian)容器(qi)三種(zhong)。

2、按介質分

有(you)(you)(you)(you)氣(qi)體(ti)(ti)(ti)(ti)(ti)介(jie)質、無(wu)機(ji)(ji)(ji)固(gu)(gu)(gu)(gu)體(ti)(ti)(ti)(ti)(ti)介(jie)質、有(you)(you)(you)(you)機(ji)(ji)(ji)固(gu)(gu)(gu)(gu)體(ti)(ti)(ti)(ti)(ti)介(jie)質、電(dian)(dian)(dian)(dian)解(jie)(jie)介(jie)質、液(ye)(ye)體(ti)(ti)(ti)(ti)(ti)介(jie)質及(ji)復合(he)介(jie)質等電(dian)(dian)(dian)(dian)容(rong)器(qi)(qi)(qi)(qi)(qi)(qi)。 其中(zhong)： 氣(qi)體(ti)(ti)(ti)(ti)(ti)電(dian)(dian)(dian)(dian)容(rong)器(qi)(qi)(qi)(qi)(qi)(qi)包括(kuo)(kuo)空氣(qi)、真空、充(chong)氣(qi)式(shi)電(dian)(dian)(dian)(dian)容(rong)器(qi)(qi)(qi)(qi)(qi)(qi)；無(wu)機(ji)(ji)(ji)固(gu)(gu)(gu)(gu)體(ti)(ti)(ti)(ti)(ti)電(dian)(dian)(dian)(dian)容(rong)器(qi)(qi)(qi)(qi)(qi)(qi)包括(kuo)(kuo)云母、陶瓷及(ji)玻璃釉電(dian)(dian)(dian)(dian)容(rong)器(qi)(qi)(qi)(qi)(qi)(qi)；有(you)(you)(you)(you)機(ji)(ji)(ji)固(gu)(gu)(gu)(gu)體(ti)(ti)(ti)(ti)(ti)電(dian)(dian)(dian)(dian)容(rong)器(qi)(qi)(qi)(qi)(qi)(qi)包括(kuo)(kuo)有(you)(you)(you)(you)機(ji)(ji)(ji)薄膜(mo)及(ji)紙介(jie)電(dian)(dian)(dian)(dian)容(rong)器(qi)(qi)(qi)(qi)(qi)(qi)；電(dian)(dian)(dian)(dian)解(jie)(jie)介(jie)質電(dian)(dian)(dian)(dian)容(rong)器(qi)(qi)(qi)(qi)(qi)(qi)包括(kuo)(kuo)鋁電(dian)(dian)(dian)(dian)解(jie)(jie)、鈮電(dian)(dian)(dian)(dian)解(jie)(jie)及(ji)鉭電(dian)(dian)(dian)(dian)解(jie)(jie)電(dian)(dian)(dian)(dian)容(rong)器(qi)(qi)(qi)(qi)(qi)(qi)；液(ye)(ye)體(ti)(ti)(ti)(ti)(ti)介(jie)質電(dian)(dian)(dian)(dian)容(rong)器(qi)(qi)(qi)(qi)(qi)(qi)包括(kuo)(kuo)各種有(you)(you)(you)(you)機(ji)(ji)(ji)油質及(ji)液(ye)(ye)體(ti)(ti)(ti)(ti)(ti)電(dian)(dian)(dian)(dian)容(rong)器(qi)(qi)(qi)(qi)(qi)(qi)； 復合(he)介(jie)質電(dian)(dian)(dian)(dian)容(rong)器(qi)(qi)(qi)(qi)(qi)(qi)包括(kuo)(kuo)有(you)(you)(you)(you)機(ji)(ji)(ji)固(gu)(gu)(gu)(gu)體(ti)(ti)(ti)(ti)(ti)復合(he)、無(wu)機(ji)(ji)(ji)固(gu)(gu)(gu)(gu)體(ti)(ti)(ti)(ti)(ti)復合(he)、有(you)(you)(you)(you)機(ji)(ji)(ji)固(gu)(gu)(gu)(gu)體(ti)(ti)(ti)(ti)(ti)與無(wu)機(ji)(ji)(ji)固(gu)(gu)(gu)(gu)體(ti)(ti)(ti)(ti)(ti)復合(he)制做(zuo)的電(dian)(dian)(dian)(dian)容(rong)器(qi)(qi)(qi)(qi)(qi)(qi)。

3、在(zai)市(shi)(shi)場(chang)應(ying)用中主要是(shi)三大類電(dian)(dian)容器(qi)：瓷(ci)片電(dian)(dian)容器(qi)、薄膜電(dian)(dian)容器(qi)、電(dian)(dian)解電(dian)(dian)容器(qi)。這三大類電(dian)(dian)容器(qi)占市(shi)(shi)場(chang)量的99%以上。