led燈珠前面加電容 led燈需要電容嗎 |
| 發布時間:2022-08-29 13:06:13 |
大家好今天來介(jie)紹led燈珠前(qian)面(mian)加電容(rong)(rong)(LED燈并聯電容(rong)(rong))的問題，以下(xia)是小編對此問題的歸納整(zheng)理，來看看吧(ba)。 文章目錄列表:led燈串聯電容能降低電流嗎電(dian)(dian)(dian)(dian)(dian)阻與LED串聯是為了(le)(le)(le)分壓(ya),否則LED的(de)電(dian)(dian)(dian)(dian)(dian)流(liu)過大會損(sun)壞.電(dian)(dian)(dian)(dian)(dian)容的(de)作(zuo)用(yong)是通(tong)交流(liu),隔直(zhi)流(liu).如(ru)果此電(dian)(dian)(dian)(dian)(dian)路(lu)中沒有電(dian)(dian)(dian)(dian)(dian)容的(de)話,通(tong)電(dian)(dian)(dian)(dian)(dian)后(hou)LED就(jiu)會發(fa)光(guang),亮(liang)度由(you)暗到明有一(yi)個過程(cheng),時間長.如(ru)果用(yong)電(dian)(dian)(dian)(dian)(dian)容與電(dian)(dian)(dian)(dian)(dian)阻并聯了(le)(le)(le)之(zhi)后(hou),由(you)于電(dian)(dian)(dian)(dian)(dian)容的(de)電(dian)(dian)(dian)(dian)(dian)壓(ya)不突變(bian),所以(yi)剛開(kai)始(shi)通(tong)電(dian)(dian)(dian)(dian)(dian)時,所有的(de)電(dian)(dian)(dian)(dian)(dian)壓(ya)都加(jia)在了(le)(le)(le)LED上,LED在很(hen)短的(de)時間內發(fa)光(guang)亮(liang)度就(jiu)很(hen)高了(le)(le)(le),然后(hou)由(you)于電(dian)(dian)(dian)(dian)(dian)容的(de)充電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)流(liu)越(yue)來越(yue)小,LED的(de)工作(zuo)就(jiu)由(you)電(dian)(dian)(dian)(dian)(dian)阻承但了(le)(le)(le)
LED燈為什么要加電容接上電(dian)(dian)容就不會(hui)給濾(lv)波電(dian)(dian)容充電(dian)(dian)，燈沒電(dian)(dian)也(ye)就不亮(liang)了。問題出在LED燈具配套的恒流(liu)源（俗稱驅動）是(shi)開關(guan)電(dian)(dian)源架(jia)構，這種(zhong)架(jia)構交流(liu)市電(dian)(dian)整流(liu)后有個濾(lv)波大(da)容量電(dian)(dian)容，關(guan)斷(duan)開關(guan)后電(dian)(dian)路(lu)失電(dian)(dian)，燈熄滅。 從分布電容(rong)漏過來的(de)極微小的(de)電流很容(rong)易通過這(zhe)個后接的(de)電容(rong)返回(hui)電網(wang)。 電(dian)(dian)(dian)容本質上(shang)是并(bing)聯在燈具恒流源(yuan)輸入(ru)端2交流接線之(zhi)間，由于電(dian)(dian)(dian)容更(geng)容易通(tong)過交流電(dian)(dian)(dian)，所(suo)以從分布(bu)電(dian)(dian)(dian)容漏過來的極(ji)微(wei)小電(dian)(dian)(dian)流的絕大部(bu)分，都通(tong)過這個并(bing)聯的電(dian)(dian)(dian)容返回電(dian)(dian)(dian)網了。 接上電容就基本斷絕了給濾(lv)波電容充電的(de)(de)環(huan)節，當然(ran)也(ye)就不(bu)閃了。擴展資料(liao)：返回電網的(de)(de)電流并未(wei)做(zuo)功，所以不(bu)會增加耗(hao)電。 如(ru)果一定要精確計(ji)算，理(li)論上這么做比原來關斷(duan)燈具(ju)(ju)時(shi)的(de)(de)狀態還要省(sheng)電(dian)(dian)(dian)（因(yin)電(dian)(dian)(dian)源布線原來就存(cun)在的(de)(de)分布電(dian)(dian)(dian)容沒(mei)變，但(dan)關斷(duan)開關后漏過來的(de)(de)極微小電(dian)(dian)(dian)流的(de)(de)絕(jue)大部分，不是(shi)流過燈具(ju)(ju)產生耗電(dian)(dian)(dian)，而是(shi)通過并聯的(de)(de)電(dian)(dian)(dian)容返回電(dian)(dian)(dian)網了）。 其(qi)實(shi)，無論開關通(tong)與(yu)斷(duan)，分布電(dian)(dian)容都在，只(zhi)是開關接通(tong)時(shi)，將分布電(dian)(dian)容短(duan)路(lu)了，使其(qi)在電(dian)(dian)路(lu)中不起作(zuo)用。 led燈加電容的正確方法方法如下： 1.棕紅色的電(dian)(dian)容叫交(jiao)流(liu)電(dian)(dian)容。不分左右直接焊(han)。 2.黑色的(de)叫(jiao)電解電容（作用濾波(bo)即提供純凈直流電給(gei)led燈）。要(yao)(yao)分右(you)左（即要(yao)(yao)分正負極(ji)），短腳則(ze)焊接在led燈的(de)負極(ji)，另(ling)一(yi)則(ze)焊正極(ji)。 3.即使是最(zui)簡單(dan)的(de)(de)電路，必須嚴(yan)格(ge)按(an)照(zhao)電路圖進(jin)行焊(han)接(jie)工(gong)(gong)作或者大(da)概略懂電路的(de)(de)工(gong)(gong)作原理。 LED燈不夠亮加個電容能多亮嗎正常工(gong)作的LED燈不(bu)夠(gou)亮(liang)(liang)，需(xu)要增加瓦數才能提(ti)高亮(liang)(liang)度(du)。不(bu)是(shi)(shi)采用加電(dian)容的方(fang)法。如果是(shi)(shi)屬于不(bu)能正常工(gong)作的LED燈亮(liang)(liang)度(du)不(bu)夠(gou)，那就需(xu)要檢查電(dian)流(liu)(liu)(liu)是(shi)(shi)否(fou)達到標(biao)準工(gong)作電(dian)流(liu)(liu)(liu)，調整電(dian)流(liu)(liu)(liu)，使其達到標(biao)準工(gong)作電(dian)流(liu)(liu)(liu)，即可(ke)。 led燈開關關掉了會微亮并聯安個電容可以解決嗎LED燈(deng)(deng)(deng)開(kai)關(guan)(guan)關(guan)(guan)斷后，燈(deng)(deng)(deng)仍然會發出微弱(ruo)的(de)亮(liang)(liang)光，這是因為現在的(de)LED燈(deng)(deng)(deng)珠(zhu)一般(ban)(ban)都是高亮(liang)(liang)度LED燈(deng)(deng)(deng)珠(zhu)，其靈敏度很高，流過燈(deng)(deng)(deng)珠(zhu)的(de)電流有十幾μA，就會使燈(deng)(deng)(deng)珠(zhu)微亮(liang)(liang)。一般(ban)(ban)LED燈(deng)(deng)(deng)在開(kai)關(guan)(guan)斷開(kai)后出現微亮(liang)(liang)是以下兩種情況所致。 一是LED燈開關接線有誤，開關上接的是零線。若LED燈的開關關斷后，燈還是微亮，此時可以用電筆測量一下燈開關斷開的是不是火線若燈的開關接線錯誤，斷開的是零線，此時雖然開關已關斷，但LED燈的整個電路仍然與AC220V的火線連接，此時若LED燈與墻壁之間的絕緣電阻不是很大，將會有μA級的電流流過LED燈珠，從而使燈珠微亮。若是這種情況導致燈微亮，只要將火線接在開關上即可。 若通過上述方法仍不能解決問題，可能是LED燈電路的設計有問題，此時可以通過在LED燈恒流驅動器輸出端并聯電阻的方法來解決問題（LED燈恒流驅動器輸出端一般都帶有電容，故不需再加電容）。并聯的電阻可選用100～300KΩ的電阻，按圖1電路所示，并聯在電容C7的兩端，這樣流過燈珠的微弱電流會被電阻旁路，燈珠也就不會微亮了。 以上就是(shi)小編對(dui)于led燈珠(zhu)前(qian)面(mian)加電容(rong)(LED燈并聯(lian)電容(rong))問題(ti)和相關問題(ti)的解(jie)答了，希望(wang)對(dui)你有(you)用(yong) |
