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關于福州電容器只要是同電壓就可以用嗎？

來源：jincuigu.com.cn 發布時間：2019-10-15 返回
　　　關于電容器的容量和耐壓選取，羅克自動化這里給您幾點建議：(1)應根據電路要求選擇電容器的類型。對于要求不高的低頻電路和直流電路，一般可選用紙介電容器，也可選用低頻瓷介電容器。在高頻電路中，當電氣性能要求較高時，可選用云母電容器、高頻瓷介電容器或穿心瓷介電容器。在要求較高的中頻及低頻電路中，可選用塑料薄膜電容器。
　　　

電容器


　　　在電(dian)(dian)(dian)(dian)源濾(lv)波(bo)、去耦電(dian)(dian)(dian)(dian)路(lu)中，一般可選(xuan)用(yong)鋁(lv)電(dian)(dian)(dian)(dian)解電(dian)(dian)(dian)(dian)容(rong)(rong)器(qi)。對(dui)于(yu)要求可-靠性高(gao)、穩(wen)定性高(gao)的(de)電(dian)(dian)(dian)(dian)路(lu)中，應(ying)選(xuan)用(yong)云(yun)母(mu)電(dian)(dian)(dian)(dian)容(rong)(rong)器(qi)、薄(bo)膜電(dian)(dian)(dian)(dian)容(rong)(rong)器(qi)或(huo)鉭電(dian)(dian)(dian)(dian)解電(dian)(dian)(dian)(dian)容(rong)(rong)器(qi)。對(dui)于(yu)高(gao)壓電(dian)(dian)(dian)(dian)路(lu)，應(ying)選(xuan)用(yong)高(gao)壓瓷介(jie)電(dian)(dian)(dian)(dian)容(rong)(rong)器(qi)或(huo)其他類型的(de)高(gao)壓電(dian)(dian)(dian)(dian)容(rong)(rong)器(qi)。對(dui)于(yu)調諧電(dian)(dian)(dian)(dian)路(lu)，應(ying)選(xuan)用(yong)可變電(dian)(dian)(dian)(dian)容(rong)(rong)器(qi)及微調
　　　
　　　(2)合(he)理確定電(dian)(dian)(dian)(dian)容(rong)器的(de)(de)電(dian)(dian)(dian)(dian)容(rong)量(liang)及允(yun)許偏差(cha)。在(zai)低頻的(de)(de)耦合(he)及去耦電(dian)(dian)(dian)(dian)路中，一(yi)般(ban)對電(dian)(dian)(dian)(dian)容(rong)器的(de)(de)電(dian)(dian)(dian)(dian)容(rong)量(liang)要求不太嚴格，只要按計(ji)算(suan)值(zhi)選(xuan)(xuan)取稍(shao)大(da)一(yi)些(xie)的(de)(de)電(dian)(dian)(dian)(dian)容(rong)量(liang)便可以(yi)了。在(zai)定時(shi)電(dian)(dian)(dian)(dian)路、振(zhen)蕩回(hui)路及音調控制等電(dian)(dian)(dian)(dian)路中，對電(dian)(dian)(dian)(dian)容(rong)器的(de)(de)電(dian)(dian)(dian)(dian)容(rong)量(liang)要求較(jiao)為(wei)嚴格，因此選(xuan)(xuan)取電(dian)(dian)(dian)(dian)容(rong)量(liang)的(de)(de)標稱(cheng)值(zhi)應盡(jin)量(liang)與計(ji)算(suan)的(de)(de)電(dian)(dian)(dian)(dian)容(rong)值(zhi)相一(yi)致或盡(jin)量(liang)接近，應盡(jin)量(liang)選(xuan)(xuan)精度高的(de)(de)電(dian)(dian)(dian)(dian)容(rong)器。在(zai)一(yi)些(xie)特殊的(de)(de)電(dian)(dian)(dian)(dian)路中，往往對電(dian)(dian)(dian)(dian)容(rong)器的(de)(de)電(dian)(dian)(dian)(dian)容(rong)量(liang)要求非常準(zhun)確，此時(shi)應選(xuan)(xuan)用允(yun)許偏差(cha)在(zai)±0.1％～±0.5％范圍內的(de)(de)高精度電(dian)(dian)(dian)(dian)容(rong)器。
　　　
　　　(3)選(xuan)用(yong)(yong)(yong)電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器的(de)(de)(de)工(gong)(gong)作(zuo)電(dian)(dian)(dian)(dian)壓(ya)應符合電(dian)(dian)(dian)(dian)路(lu)(lu)要求。一般(ban)情況下，選(xuan)用(yong)(yong)(yong)電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器的(de)(de)(de)額(e)定(ding)電(dian)(dian)(dian)(dian)壓(ya)應是實(shi)際工(gong)(gong)作(zuo)電(dian)(dian)(dian)(dian)壓(ya)的(de)(de)(de)1.2～1.3倍。對于工(gong)(gong)作(zuo)環境溫度較高或穩定(ding)性較差的(de)(de)(de)電(dian)(dian)(dian)(dian)路(lu)(lu)，選(xuan)用(yong)(yong)(yong)電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器的(de)(de)(de)額(e)定(ding)電(dian)(dian)(dian)(dian)壓(ya)應考慮降額(e)使用(yong)(yong)(yong)，留(liu)有更(geng)大的(de)(de)(de)余量(liang)才好。若(ruo)電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器所在電(dian)(dian)(dian)(dian)路(lu)(lu)中的(de)(de)(de)工(gong)(gong)作(zuo)電(dian)(dian)(dian)(dian)壓(ya)高于電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器的(de)(de)(de)額(e)定(ding)電(dian)(dian)(dian)(dian)壓(ya)，往(wang)往(wang)電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器級易發生(sheng)擊穿(chuan)現象(xiang)，使整個電(dian)(dian)(dian)(dian)路(lu)(lu)無法，正常工(gong)(gong)作(zuo)。電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器的(de)(de)(de)額(e)定(ding)電(dian)(dian)(dian)(dian)壓(ya)一般(ban)是指直流電(dian)(dian)(dian)(dian)壓(ya)，若(ruo)要用(yong)(yong)(yong)于交流電(dian)(dian)(dian)(dian)路(lu)(lu)，應根據(ju)電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器的(de)(de)(de)特性及規格選(xuan)用(yong)(yong)(yong)；若(ruo)要用(yong)(yong)(yong)于脈動電(dian)(dian)(dian)(dian)路(lu)(lu)，則(ze)應按交、直流分量(liang)總和(he)不(bu)得(de)過電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器的(de)(de)(de)額(e)定(ding)電(dian)(dian)(dian)(dian)壓(ya)來選(xuan)用(yong)(yong)(yong)。
　　　
　　　(4)優先(xian)選用(yong)絕緣電阻大(da)、介(jie)質損耗小、漏電流小的(de)電容器。
　　　
　　　(5)應(ying)(ying)(ying)根據電(dian)(dian)(dian)(dian)容(rong)器(qi)工(gong)作環境(jing)選(xuan)(xuan)(xuan)擇電(dian)(dian)(dian)(dian)容(rong)器(qi)。電(dian)(dian)(dian)(dian)容(rong)器(qi)的性能參(can)數與使(shi)用(yong)環境(jing)的條(tiao)件(jian)密切(qie)相關，因(yin)此在(zai)(zai)選(xuan)(xuan)(xuan)用(yong)電(dian)(dian)(dian)(dian)容(rong)器(qi)時應(ying)(ying)(ying)注意：①在(zai)(zai)高溫(wen)條(tiao)件(jian)下使(shi)用(yong)的電(dian)(dian)(dian)(dian)容(rong)器(qi)應(ying)(ying)(ying)選(xuan)(xuan)(xuan)用(yong)工(gong)作溫(wen)度(du)高的電(dian)(dian)(dian)(dian)容(rong)器(qi)；②在(zai)(zai)潮濕環境(jing)中工(gong)作的電(dian)(dian)(dian)(dian)路，應(ying)(ying)(ying)選(xuan)(xuan)(xuan)用(yong)抗濕性好的密封電(dian)(dian)(dian)(dian)容(rong)器(qi)；③在(zai)(zai)低(di)溫(wen)條(tiao)件(jian)下使(shi)用(yong)的電(dian)(dian)(dian)(dian)容(rong)器(qi)，應(ying)(ying)(ying)選(xuan)(xuan)(xuan)用(yong)耐寒(han)的電(dian)(dian)(dian)(dian)容(rong)器(qi)，這對電(dian)(dian)(dian)(dian)解電(dian)(dian)(dian)(dian)容(rong)器(qi)來說尤為重要(yao)，因(yin)為普通的電(dian)(dian)(dian)(dian)解電(dian)(dian)(dian)(dian)容(rong)器(qi)在(zai)(zai)低(di)溫(wen)條(tiao)件(jian)下會使(shi)電(dian)(dian)(dian)(dian)解液結冰而失效。

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