滌綸電容特點有哪些
突出優(you)點:薄膜電(dian)(dian)容(rong)(rong)的精度、損耗(hao)角、絕緣電(dian)(dian)阻(zu)、溫度特性(xing)、可靠(kao)性(xing)及適應環境等指標都(dou)優(you)于(yu)電(dian)(dian)解電(dian)(dian)容(rong)(rong),瓷片(pian)電(dian)(dian)容(rong)(rong)兩種(zhong)電(dian)(dian)容(rong)(rong)。
突出缺點:容量價格比及容量體積比都大(da)于(yu)以(yi)上兩種電容。
用途:在各(ge)種直流或中(zhong)低頻脈(mo)動電路中(zhong)使用。適(shi)宜(yi)作為旁(pang)路電容(rong)使用。
容(rong)值范(fan)圍:470pF~4.7μF。
額定(ding)電壓范圍:63-630V。
損(sun)耗(hao)角正切:0.3-0.7。
工(gong)作溫度:-55℃到125℃。
溫度系數:+200 +600ppm。
常見分類:跟很(hen)多電容一樣,滌綸電容還有很(hen)多細小(xiao)的(de)分類,比(bi)如(ru)常見的(de)CL11,CL21;區別(bie)在于CL21電容內壁采用(yong)金屬化技(ji)術,體(ti)積較CL11小(xiao)很(hen)多,但整(zheng)體(ti)性能(neng)不如(ru)CL11。因此(ci)購買時需(xu)要向(xiang)商家(jia)說明,是買哪一種。
滌綸電容參數識別
1、國外電(dian)容器耐壓值通常(chang)用字母(mu)來表示基數(shu),常(chang)見的(de)代碼和基數(shu)對應關(guan)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(zi)母(mu)前面的數表示10的冪,比如2A,即為(wei)(wei)102*1.0=100V,2C為(wei)(wei)102*1.6=160V等(deng)等(deng)。
耐(nai)壓值后方的字母表示電容容量,單位為pF。
例如:823表示容量為82*10^3=82000Pf ,224表示22*104=220000pf=0.22μF;最后的字母表示精度,比如J表示容量允許偏差(cha)為±5%等等。
典型的(de)電容標識示例:2A823J 即82000Pf±5%,耐(nai)壓(ya)100V。
2、電容器的參數標注方法
(1) 直(zhi)標(biao)法:將電(dian)容器的主(zhu)要參數(標(biao)稱容量、額(e)定電(dian)壓、及允許偏(pian)差(cha))直(zhi)接標(biao)注在電(dian)容器上,如0.0047μf/275V,0.0047μf是(shi)(shi)容量,相當于4700Pf,275V應是(shi)(shi)耐壓(不屬優選(xuan)數系(xi)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. 數字標注法 一般是(shi)用3位(wei)數字表示電容器的容量(liang)。其中前兩位(wei)為(wei)有效值(zhi)(zhi)數字,第三位(wei)為(wei)倍(bei)乘(cheng)數(即(ji)表示有效值(zhi)(zhi)后(hou)有多少個0)。如104,表示有效值(zhi)(zhi)是(shi)10,后(hou)面再加4個0,即(ji)100000Pf=0.1μf。
(3)字母與數(shu)字混(hun)合標注(zhu)法(fa):用2—4位數(shu)字表(biao)示有效值,用P、n、M、μ、G、m等(deng)字母表(biao)示有效數(shu)后面的量級。進口電容器在(zai)標注(zhu)數(shu)值時(shi)不用小(xiao)數(shu)點,而(er)是將整數(shu)部(bu)分寫在(zai)字母之前,將小(xiao)數(shu)部(bu)分寫在(zai)字母后面。如4P7表(biao)示4.7Pf,3m3表(biao)示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)字母含(han)義:
F ±1%
G ±2%
J ±5%
K ±10%
M ±20%
N ±30%
如104K表(biao)示容量100000Pf=0.1μf,容量允許偏差(cha)為±10%。
(資料來源《通用(yong)電子元器件(jian)的選用(yong)與檢(jian)測》)
國產電容器(qi)(qi)標注可查閱《GB/T 2691-1994 電阻(zu)器(qi)(qi)和電容器(qi)(qi)的標志代碼(ma)。
滌綸電容的作用
滌(di)綸電(dian)容是電(dian)子產品中(zhong)必不可(ke)少的一(yi)個基本元(yuan)件,在電(dian)路(lu)中(zhong)充當著濾波、振蕩、電(dian)源退耦(ou)、脈動信號的旁路(lu)及耦(ou)合等。
滌綸電(dian)容的最簡單結構可由兩個(ge)金(jin)屬板(ban)(ban)(ban)(ban)中間(jian)(jian)(jian)夾(jia)一層絕緣介(jie)質組成。在(zai)兩個(ge)金(jin)屬板(ban)(ban)(ban)(ban)(極(ji)(ji)(ji)板(ban)(ban)(ban)(ban))間(jian)(jian)(jian)加一個(ge)電(dian)壓(ya),極(ji)(ji)(ji)板(ban)(ban)(ban)(ban)就能儲(chu)存電(dian)荷。儲(chu)存電(dian)荷的大小與(yu)極(ji)(ji)(ji)板(ban)(ban)(ban)(ban)間(jian)(jian)(jian)電(dian)壓(ya)與(yu)極(ji)(ji)(ji)板(ban)(ban)(ban)(ban)面(mian)積(ji)(容量)成正比,與(yu)極(ji)(ji)(ji)板(ban)(ban)(ban)(ban)間(jian)(jian)(jian)的距離(li)成反比。Q=CV 即C=Q/V=εS/4πd(《詳見薄膜(mo)電(dian)容器理論計算(suan)及修正》)Q—極(ji)(ji)(ji)板(ban)(ban)(ban)(ban)上儲(chu)存的電(dian)荷;C—電(dian)容器(PF);V—極(ji)(ji)(ji)板(ban)(ban)(ban)(ban)間(jian)(jian)(jian)的電(dian)壓(ya)(V); ε——介(jie)質介(jie)電(dian)常(chang)數(聚酯膜(mo)為(wei)3.0,聚丙(bing)烯(xi)膜(mo)2.1); S—金(jin)屬極(ji)(ji)(ji)板(ban)(ban)(ban)(ban)面(mian)積(ji)(mm2); d—極(ji)(ji)(ji)板(ban)(ban)(ban)(ban)間(jian)(jian)(jian)的距離(li)(mm)。
滌綸電容的種類
1、按其可調節性分
可分為固定電(dian)容器、微調電(dian)容器、可變電(dian)容器三種。
2、按介質分
有(you)(you)(you)氣體(ti)(ti)(ti)(ti)介(jie)(jie)(jie)質(zhi)、無(wu)(wu)機(ji)(ji)固(gu)體(ti)(ti)(ti)(ti)介(jie)(jie)(jie)質(zhi)、有(you)(you)(you)機(ji)(ji)固(gu)體(ti)(ti)(ti)(ti)介(jie)(jie)(jie)質(zhi)、電(dian)(dian)解(jie)介(jie)(jie)(jie)質(zhi)、液體(ti)(ti)(ti)(ti)介(jie)(jie)(jie)質(zhi)及(ji)復合(he)介(jie)(jie)(jie)質(zhi)等電(dian)(dian)容(rong)器(qi)(qi)。 其中: 氣體(ti)(ti)(ti)(ti)電(dian)(dian)容(rong)器(qi)(qi)包(bao)(bao)括(kuo)(kuo)空(kong)氣、真空(kong)、充氣式(shi)電(dian)(dian)容(rong)器(qi)(qi);無(wu)(wu)機(ji)(ji)固(gu)體(ti)(ti)(ti)(ti)電(dian)(dian)容(rong)器(qi)(qi)包(bao)(bao)括(kuo)(kuo)云(yun)母(mu)、陶瓷及(ji)玻璃釉電(dian)(dian)容(rong)器(qi)(qi);有(you)(you)(you)機(ji)(ji)固(gu)體(ti)(ti)(ti)(ti)電(dian)(dian)容(rong)器(qi)(qi)包(bao)(bao)括(kuo)(kuo)有(you)(you)(you)機(ji)(ji)薄膜及(ji)紙(zhi)介(jie)(jie)(jie)電(dian)(dian)容(rong)器(qi)(qi);電(dian)(dian)解(jie)介(jie)(jie)(jie)質(zhi)電(dian)(dian)容(rong)器(qi)(qi)包(bao)(bao)括(kuo)(kuo)鋁電(dian)(dian)解(jie)、鈮電(dian)(dian)解(jie)及(ji)鉭電(dian)(dian)解(jie)電(dian)(dian)容(rong)器(qi)(qi);液體(ti)(ti)(ti)(ti)介(jie)(jie)(jie)質(zhi)電(dian)(dian)容(rong)器(qi)(qi)包(bao)(bao)括(kuo)(kuo)各種(zhong)有(you)(you)(you)機(ji)(ji)油質(zhi)及(ji)液體(ti)(ti)(ti)(ti)電(dian)(dian)容(rong)器(qi)(qi); 復合(he)介(jie)(jie)(jie)質(zhi)電(dian)(dian)容(rong)器(qi)(qi)包(bao)(bao)括(kuo)(kuo)有(you)(you)(you)機(ji)(ji)固(gu)體(ti)(ti)(ti)(ti)復合(he)、無(wu)(wu)機(ji)(ji)固(gu)體(ti)(ti)(ti)(ti)復合(he)、有(you)(you)(you)機(ji)(ji)固(gu)體(ti)(ti)(ti)(ti)與(yu)無(wu)(wu)機(ji)(ji)固(gu)體(ti)(ti)(ti)(ti)復合(he)制(zhi)做的電(dian)(dian)容(rong)器(qi)(qi)。
3、在市場應(ying)用(yong)中主(zhu)要是三大類電(dian)(dian)容(rong)(rong)器(qi):瓷片電(dian)(dian)容(rong)(rong)器(qi)、薄膜電(dian)(dian)容(rong)(rong)器(qi)、電(dian)(dian)解電(dian)(dian)容(rong)(rong)器(qi)。這三大類電(dian)(dian)容(rong)(rong)器(qi)占市場量的99%以上(shang)。
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