滌綸電容特點有哪些

突(tu)出優點：薄(bo)膜電(dian)(dian)容(rong)的精度、損耗角、絕緣電(dian)(dian)阻、溫(wen)度特性、可靠性及適應環境等指標都(dou)優于(yu)電(dian)(dian)解電(dian)(dian)容(rong)，瓷片電(dian)(dian)容(rong)兩種電(dian)(dian)容(rong)。

突出缺點：容量價(jia)格比(bi)(bi)及(ji)容量體積比(bi)(bi)都(dou)大于以上兩種電容。

用(yong)途：在各(ge)種直流或中低頻脈動電路中使(shi)用(yong)。適宜作為旁路電容(rong)使(shi)用(yong)。

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容值(zhi)范圍：470pF~4.7μF。

額定(ding)電(dian)壓(ya)范圍(wei)：63-630V。

損耗角正切：0.3-0.7。

工作溫度：-55℃到(dao)125℃。

溫度(du)系數(shu)：+200 +600ppm。

常(chang)見(jian)(jian)分類(lei)：跟很多電容一樣(yang)，滌綸電容還有很多細小的分類(lei)，比如常(chang)見(jian)(jian)的CL11，CL21；區別在于CL21電容內壁采用金屬化(hua)技術，體積較(jiao)CL11小很多，但整體性能不(bu)如CL11。因此購買時需要(yao)向商家(jia)說明，是買哪一種。

滌綸電容參數識別

1、國外電容器耐(nai)壓值(zhi)通常(chang)用字(zi)母(mu)來表示基數(shu)，常(chang)見的(de)代碼和基數(shu)對應關系是：

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(qian)面(mian)的數(shu)表示10的冪(mi)，比如2A，即為102*1.0=100V，2C為102*1.6=160V等等。

耐壓值后方的(de)字(zi)母表示電(dian)容(rong)容(rong)量(liang)，單(dan)位為pF。

例如(ru)：823表(biao)示(shi)容量(liang)為82*10^3=82000Pf ，224表(biao)示(shi)22*104=220000pf=0.22μF；最后的字母(mu)表(biao)示(shi)精度，比如(ru)J表(biao)示(shi)容量(liang)允許偏差為±5%等(deng)等(deng)。

典(dian)型的電容(rong)標識示例(li)：2A823J 即(ji)82000Pf±5%，耐壓100V。

2、電容器的參數標注方法

（1） 直標(biao)法：將電(dian)(dian)容器的主要參數（標(biao)稱容量(liang)、額定電(dian)(dian)壓、及允(yun)許偏差）直接標(biao)注在電(dian)(dian)容器上，如0.0047μf/275V，0.0047μf是容量(liang)，相當(dang)于4700Pf，275V應是耐壓（不(bu)屬(shu)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(shu)字(zi)標注法 一般是用3位(wei)數(shu)字(zi)表(biao)示(shi)(shi)電容器的容量。其中(zhong)前兩位(wei)為(wei)有(you)(you)效值(zhi)數(shu)字(zi)，第三(san)位(wei)為(wei)倍(bei)乘數(shu)（即(ji)表(biao)示(shi)(shi)有(you)(you)效值(zhi)后有(you)(you)多少個0）。如104，表(biao)示(shi)(shi)有(you)(you)效值(zhi)是10，后面(mian)再(zai)加4個0，即(ji)100000Pf=0.1μf。

（3）字(zi)母(mu)與數(shu)(shu)字(zi)混(hun)合(he)標注法：用2—4位(wei)數(shu)(shu)字(zi)表示(shi)有效值(zhi)，用P、n、M、μ、G、m等字(zi)母(mu)表示(shi)有效數(shu)(shu)后面的量級。進(jin)口電容器在(zai)標注數(shu)(shu)值(zhi)時不(bu)用小數(shu)(shu)點，而是將整數(shu)(shu)部(bu)分寫在(zai)字(zi)母(mu)之前(qian)，將小數(shu)(shu)部(bu)分寫在(zai)字(zi)母(mu)后面。如4P7表示(shi)4．7Pf，3m3表示(shi)3300μf(3.3mf)等。

3、電容器的容量的允許偏差標注字母及含義

（1）字母(mu)含義：

F ±1%

G ±2%

J ±5%

K ±10%

M ±20%

N ±30%

如104K表示容量(liang)100000Pf=0.1μf，容量(liang)允許偏差(cha)為±10%。

（資料來源《通用電子元器件的選用與檢測》）

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

滌綸電容的作用

滌綸電(dian)容是(shi)電(dian)子產品中必不可少的(de)一個基(ji)本(ben)元件，在(zai)電(dian)路中充當(dang)著濾(lv)波、振蕩、電(dian)源退耦(ou)、脈動信(xin)號的(de)旁路及耦(ou)合等。

滌綸電(dian)(dian)(dian)(dian)容(rong)的最簡(jian)單結構可由兩個金屬板(ban)(ban)(ban)中間(jian)夾一(yi)層絕緣(yuan)介(jie)(jie)質(zhi)組成。在(zai)兩個金屬板(ban)(ban)(ban)（極(ji)(ji)板(ban)(ban)(ban)）間(jian)加一(yi)個電(dian)(dian)(dian)(dian)壓，極(ji)(ji)板(ban)(ban)(ban)就能儲存電(dian)(dian)(dian)(dian)荷。儲存電(dian)(dian)(dian)(dian)荷的大(da)小與極(ji)(ji)板(ban)(ban)(ban)間(jian)電(dian)(dian)(dian)(dian)壓與極(ji)(ji)板(ban)(ban)(ban)面積（容(rong)量）成正比，與極(ji)(ji)板(ban)(ban)(ban)間(jian)的距離成反比。Q=CV 即C=Q/V=εS/4πd（《詳(xiang)見(jian)薄膜電(dian)(dian)(dian)(dian)容(rong)器(qi)理論計算及修正》）Q—極(ji)(ji)板(ban)(ban)(ban)上儲存的電(dian)(dian)(dian)(dian)荷；C—電(dian)(dian)(dian)(dian)容(rong)器(qi)（PF）；V—極(ji)(ji)板(ban)(ban)(ban)間(jian)的電(dian)(dian)(dian)(dian)壓（V）； ε——介(jie)(jie)質(zhi)介(jie)(jie)電(dian)(dian)(dian)(dian)常數（聚(ju)酯膜為3.0，聚(ju)丙烯膜2.1）； S—金屬極(ji)(ji)板(ban)(ban)(ban)面積(mm2)； d—極(ji)(ji)板(ban)(ban)(ban)間(jian)的距離(mm)。

滌綸電容的種類

1、按其可調節性分

可分(fen)為固(gu)定電容器(qi)、微調電容器(qi)、可變(bian)電容器(qi)三(san)種。

2、按介質分

有(you)氣(qi)體(ti)(ti)介(jie)質(zhi)(zhi)(zhi)(zhi)、無(wu)(wu)機(ji)固(gu)(gu)(gu)體(ti)(ti)介(jie)質(zhi)(zhi)(zhi)(zhi)、有(you)機(ji)固(gu)(gu)(gu)體(ti)(ti)介(jie)質(zhi)(zhi)(zhi)(zhi)、電(dian)(dian)(dian)(dian)(dian)解(jie)介(jie)質(zhi)(zhi)(zhi)(zhi)、液(ye)體(ti)(ti)介(jie)質(zhi)(zhi)(zhi)(zhi)及復(fu)合(he)(he)介(jie)質(zhi)(zhi)(zhi)(zhi)等電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器(qi)(qi)(qi)(qi)。 其中： 氣(qi)體(ti)(ti)電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器(qi)(qi)(qi)(qi)包(bao)括空(kong)氣(qi)、真空(kong)、充氣(qi)式電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器(qi)(qi)(qi)(qi)；無(wu)(wu)機(ji)固(gu)(gu)(gu)體(ti)(ti)電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器(qi)(qi)(qi)(qi)包(bao)括云母、陶瓷及玻璃(li)釉電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器(qi)(qi)(qi)(qi)；有(you)機(ji)固(gu)(gu)(gu)體(ti)(ti)電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器(qi)(qi)(qi)(qi)包(bao)括有(you)機(ji)薄膜及紙介(jie)電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器(qi)(qi)(qi)(qi)；電(dian)(dian)(dian)(dian)(dian)解(jie)介(jie)質(zhi)(zhi)(zhi)(zhi)電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器(qi)(qi)(qi)(qi)包(bao)括鋁電(dian)(dian)(dian)(dian)(dian)解(jie)、鈮電(dian)(dian)(dian)(dian)(dian)解(jie)及鉭電(dian)(dian)(dian)(dian)(dian)解(jie)電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器(qi)(qi)(qi)(qi)；液(ye)體(ti)(ti)介(jie)質(zhi)(zhi)(zhi)(zhi)電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器(qi)(qi)(qi)(qi)包(bao)括各種有(you)機(ji)油質(zhi)(zhi)(zhi)(zhi)及液(ye)體(ti)(ti)電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器(qi)(qi)(qi)(qi)； 復(fu)合(he)(he)介(jie)質(zhi)(zhi)(zhi)(zhi)電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器(qi)(qi)(qi)(qi)包(bao)括有(you)機(ji)固(gu)(gu)(gu)體(ti)(ti)復(fu)合(he)(he)、無(wu)(wu)機(ji)固(gu)(gu)(gu)體(ti)(ti)復(fu)合(he)(he)、有(you)機(ji)固(gu)(gu)(gu)體(ti)(ti)與無(wu)(wu)機(ji)固(gu)(gu)(gu)體(ti)(ti)復(fu)合(he)(he)制做的電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器(qi)(qi)(qi)(qi)。

3、在市(shi)場應(ying)用中(zhong)主要(yao)是(shi)三大類電(dian)(dian)容器(qi)：瓷片電(dian)(dian)容器(qi)、薄(bo)膜電(dian)(dian)容器(qi)、電(dian)(dian)解電(dian)(dian)容器(qi)。這(zhe)三大類電(dian)(dian)容器(qi)占市(shi)場量的(de)99%以上。