led燈珠降電流 |
| 發布時間:2022-10-09 12:03:10 |
大家好我(wo)是(shi)小編沁夢今天(tian)我(wo)們來介紹led燈(deng)珠(zhu)降電流 led燈(deng)珠(zhu)反向電壓的(de)問(wen)題，以下就是(shi)沁夢對此(ci)問(wen)題和相關問(wen)題的(de)歸納整(zheng)理(li),一(yi)起來看看吧。 文章目錄導航: led燈珠為什么加電阻 加(jia)電(dian)(dian)阻是為了降電(dian)(dian)流，電(dian)(dian)流過大燈珠芯片(pian)很容(rong)易燒壞。根據每個型號(hao)燈珠芯片(pian)的不同(tong)需要使用的電(dian)(dian)阻也是不一樣的。希望能幫到您(nin)
led燈珠點亮后反向電流減小 燈珠點亮后，隨著溫(wen)度的(de)(de)升(sheng)高(gao)燈珠的(de)(de)額定工作(zuo)電(dian)(dian)壓是會降(jiang)低的(de)(de)，平均每升(sheng)高(gao)10℃額定電(dian)(dian)壓下降(jiang)0.03-0.05V，所以大功率燈珠需要用恒流電(dian)(dian)源驅動，在(zai)溫(wen)度升(sheng)高(gao)額定電(dian)(dian)壓降(jiang)低的(de)(de)時候保持電(dian)(dian)流不(bu)變從而達(da)到抑制溫(wen)升(sheng)的(de)(de)目的(de)(de)。 如果是說從打開到(dao)熄滅這(zhe)一段(duan)時(shi)間的話(hua)，溫度的升(sheng)(sheng)高會導(dao)致電流(liu)的上(shang)升(sheng)(sheng)，從而導(dao)致電壓降(jiang)的下降(jiang)。至于長時(shi)間（半年）的我就不(bu)清楚(chu)了。 隨溫度升高而降低 led燈珠電流過大解決辦法 LED燈(deng)珠(zhu)電(dian)(dian)流過大的解決辦法(fa)，可以加限流電(dian)(dian)阻或降低電(dian)(dian)壓來解決。 led燈太亮了怎樣減小電流和功率 led燈(deng)(deng)與配套驅(qu)(qu)動(dong)器(qi)(qi)是(shi)按功(gong)率(lv)計算(suan)好的(de)，保證(zheng)led燈(deng)(deng)工作電(dian)流(liu)在(zai)合(he)理(li)范圍(wei)內，如(ru)果燈(deng)(deng)太亮可換功(gong)率(lv)小點的(de)燈(deng)(deng)。對現有的(de)燈(deng)(deng)減(jian)小亮度只(zhi)有把驅(qu)(qu)動(dong)器(qi)(qi)輸出(chu)電(dian)流(liu)減(jian)小。可在(zai)驅(qu)(qu)動(dong)器(qi)(qi)輸出(chu)端(duan)串接合(he)適(shi)電(dian)阻加以限(xian)流(liu)，缺點是(shi)電(dian)阻也耗電(dian)。 對驅動器(qi)和燈(deng)板一體的(de)燈(deng)，把(ba)驅動器(qi)輸(shu)出端線路板上(shang)的(de)銅泊斷(duan)開，串入合適電阻。 燈珠加電阻怎么調節 用(yong)(yong)的(de)(de)是白光LED吧因為LED品(pin)種很多，功率不一(yi)樣，額(e)定(ding)(ding)的(de)(de)電流也不一(yi)樣，找(zhao)到(dao)LED的(de)(de)額(e)定(ding)(ding)電流，才能確定(ding)(ding)使用(yong)(yong)多大(da)的(de)(de)電阻。 一(yi)般LED白光，工(gong)(gong)作電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓在3.2到3.4,電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)要(yao)看LED額(e)定(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)，比如(ru)一(yi)個(ge)1W的(de)(de)燈(deng)(deng)珠，額(e)定(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)一(yi)般是350MA，一(yi)般我(wo)會(hui)降低(di)(di)(di)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)來提高壽(shou)命，會(hui)取工(gong)(gong)作電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)300mA內，工(gong)(gong)作電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓取3.2，usb 5V，這(zhe)樣電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻分(fen)壓就是5減去3.2，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)300，歐姆(mu)定(ding)(ding)律就可以(yi)算(suan)出電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻大小（有條(tiao)件接通后，用(yong)測電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)，微調(diao)，這(zhe)個(ge)也(ye)是取電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)低(di)(di)(di)于額(e)定(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)的(de)(de)用(yong)處(chu)），不過需要(yao)注意(yi)的(de)(de)是這(zhe)個(ge)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻功率是要(yao)比較大的(de)(de)，耗在電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻上(shang)(shang)的(de)(de)有0.5W左右，取2倍(bei)以(yi)上(shang)(shang)，要(yao)用(yong)1W以(yi)上(shang)(shang)的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻。如(ru)果多(duo)(duo)顆(ke)(ke)燈(deng)(deng)珠，就要(yao)并(bing)聯(lian)(lian)(lian)了，當然了因(yin)為(wei)USB2.0的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)只(zhi)有500mA左右，并(bing)聯(lian)(lian)(lian)多(duo)(duo)了，只(zhi)會(hui)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)更(geng)低(di)(di)(di)而已，串(chuan)聯(lian)(lian)(lian)的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻功率要(yao)更(geng)大了，還有一(yi)個(ge)就是要(yao)注意(yi)的(de)(de)是LED的(de)(de)散(san)熱問(wen)題，如(ru)果鋁基板小，散(san)熱條(tiao)件差(cha)點的(de)(de)，盡量降低(di)(di)(di)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)。目前我(wo)用(yong)3顆(ke)(ke)1W并(bing)聯(lian)(lian)(lian)，串(chuan)了7歐多(duo)(duo)點的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻（三顆(ke)(ke)1W，22歐電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻并(bing)聯(lian)(lian)(lian)），已經用(yong)了2年多(duo)(duo)了，主要(yao)是晚(wan)上(shang)(shang)，關燈(deng)(deng)了照屏幕，不然太(tai)刺眼(yan)了 以(yi)上就是天成小編對于led燈珠降電流(liu) led燈珠反(fan)向電壓問題(ti)和相關問題(ti)的解答了，希望對你有用 【責任(ren)編輯(ji)：沁夢】 |
