一、光耦的作用是什么
光(guang)(guang)(guang)(guang)(guang)耦是光(guang)(guang)(guang)(guang)(guang)電(dian)耦合器(qi)的(de)(de)簡稱,又(you)叫光(guang)(guang)(guang)(guang)(guang)耦合器(qi),是以光(guang)(guang)(guang)(guang)(guang)為媒介傳(chuan)(chuan)輸(shu)(shu)電(dian)信(xin)號的(de)(de)一種電(dian)一光(guang)(guang)(guang)(guang)(guang)一電(dian)轉(zhuan)換(huan)器(qi)件,它通過發(fa)光(guang)(guang)(guang)(guang)(guang)二極(ji)管(LED)、受控光(guang)(guang)(guang)(guang)(guang)源或激光(guang)(guang)(guang)(guang)(guang)作為光(guang)(guang)(guang)(guang)(guang)源,將輸(shu)(shu)入(ru)(ru)的(de)(de)電(dian)信(xin)號轉(zhuan)換(huan)成光(guang)(guang)(guang)(guang)(guang)信(xin)號輸(shu)(shu)出,以實現電(dian)信(xin)號的(de)(de)調(diao)制與轉(zhuan)換(huan),其主要作用(yong)有(you):1、有(you)效隔離電(dian)氣上的(de)(de)輸(shu)(shu)入(ru)(ru)和輸(shu)(shu)出電(dian)路。2、使信(xin)號可以以光(guang)(guang)(guang)(guang)(guang)的(de)(de)形式(shi)傳(chuan)(chuan)輸(shu)(shu),具有(you)良好的(de)(de)抗干擾(rao)效果(guo)。3、起保護作用(yong),當(dang)光(guang)(guang)(guang)(guang)(guang)耦合器(qi)的(de)(de)輸(shu)(shu)入(ru)(ru)側(ce)(ce)受到強電(dian)壓沖(chong)擊而(er)損壞時,由于光(guang)(guang)(guang)(guang)(guang)耦合器(qi)的(de)(de)隔離作用(yong),不會(hui)損壞輸(shu)(shu)出側(ce)(ce)電(dian)路。
二、光耦工作原理是什么
光(guang)(guang)(guang)耦(ou)合器一(yi)般由(you)光(guang)(guang)(guang)的(de)(de)(de)發(fa)(fa)(fa)射部分(fen)(發(fa)(fa)(fa)光(guang)(guang)(guang)器件(jian)(jian))、接收部分(fen)(光(guang)(guang)(guang)敏(min)器件(jian)(jian))以及信(xin)(xin)號(hao)(hao)放大部分(fen)(電(dian)(dian)子電(dian)(dian)路)三部分(fen)組成,其(qi)工作原(yuan)理是(shi):以發(fa)(fa)(fa)光(guang)(guang)(guang)器件(jian)(jian)的(de)(de)(de)管腳(jiao)為輸(shu)入端(duan)(duan),光(guang)(guang)(guang)敏(min)器件(jian)(jian)的(de)(de)(de)管腳(jiao)為輸(shu)出(chu)端(duan)(duan),工作時把(ba)電(dian)(dian)信(xin)(xin)號(hao)(hao)加(jia)到(dao)輸(shu)入端(duan)(duan),使發(fa)(fa)(fa)光(guang)(guang)(guang)器件(jian)(jian)的(de)(de)(de)芯體發(fa)(fa)(fa)光(guang)(guang)(guang),而光(guang)(guang)(guang)敏(min)器件(jian)(jian)受光(guang)(guang)(guang)照后(hou)產(chan)生光(guang)(guang)(guang)電(dian)(dian)流并經(jing)電(dian)(dian)子電(dian)(dian)路放大后(hou)輸(shu)出(chu),實現(xian)電(dian)(dian)→光(guang)(guang)(guang)→電(dian)(dian)的(de)(de)(de)轉換(huan),從而起到(dao)輸(shu)入、輸(shu)出(chu)、隔(ge)離的(de)(de)(de)作用。簡單來(lai)說,就是(shi)輸(shu)入的(de)(de)(de)電(dian)(dian)信(xin)(xin)號(hao)(hao)驅動發(fa)(fa)(fa)光(guang)(guang)(guang)二極管,使之發(fa)(fa)(fa)出(chu)一(yi)定(ding)波長的(de)(de)(de)光(guang)(guang)(guang),被光(guang)(guang)(guang)探測器接收而產(chan)生光(guang)(guang)(guang)電(dian)(dian)流,再經(jing)過進一(yi)步放大后(hou)輸(shu)出(chu),這就完成了電(dian)(dian)→光(guang)(guang)(guang)→電(dian)(dian)的(de)(de)(de)轉換(huan)。
三、光耦怎么測好壞
光耦的好壞判斷,一般可以通過在路測量其內部二極管和三極管的正反向電阻來確定,如果想獲得更可靠的檢測結果,可以采取下面三種檢測方法:1、比較法:拆下懷疑有問題的光耦,用萬用表測量其內部二極管、三極管的正反向電阻值,用其與好的光耦對應腳的測量值進行比較,若阻值相差較大,則說明光耦已損壞。2、數字萬用表檢測法:將光耦內接二極管的+端{1}腳和-端{2}腳分別插入數字萬用表的Hfe 的c、e插孔內,此時數字萬用表應置于NPN擋;然后將光耦內接光電三極管C極{5}腳接指針式萬用表的黑表筆,e極{4}腳接紅表筆,并將指針式萬用表撥在RX1k擋。這樣就能通過指針式萬用表指針的偏轉角度——實際上是光電流的變化,來判斷光耦的情況。指針向右偏轉角度越大,說明光耦的光電轉換效率越高,即傳輸比越高,反之越低;若表針不動,則說明光耦已損壞。3、光電效應判斷法:將萬用表置于RX1k電阻擋,兩表筆分別接在光耦的輸出端{4}、{5}腳;然后用一節1.5V的電池與一只50~100Ω的電阻串接后,電池的正極端接EL817的{1}腳,負極端碰接{2}腳,或者正極端碰接{1}腳,負極端接{2}腳,這時觀察接在輸出端萬用表的指針偏轉情況。如果指針擺動,說明光耦是好的,如果不擺動,則說明光耦已損壞。萬用表指針擺動偏轉角度越大,表明光電轉換靈敏度越高。損壞的光耦需要及時更換,如果您需要采購光耦,可以先來了解一下光耦十大品牌。
四、光耦隔離是什么意思
光(guang)(guang)(guang)(guang)耦(ou)(ou)是光(guang)(guang)(guang)(guang)電(dian)耦(ou)(ou)合(he)器,用(yong)(yong)于(yu)實(shi)(shi)現(xian)光(guang)(guang)(guang)(guang)電(dian)轉換(huan),光(guang)(guang)(guang)(guang)耦(ou)(ou)隔(ge)(ge)(ge)離(li)(li),顧名思(si)義(yi)就是利用(yong)(yong)光(guang)(guang)(guang)(guang)耦(ou)(ou)合(he)器進行隔(ge)(ge)(ge)離(li)(li),常用(yong)(yong)于(yu)信號(hao)(hao)隔(ge)(ge)(ge)離(li)(li)或光(guang)(guang)(guang)(guang)電(dian)的(de)隔(ge)(ge)(ge)離(li)(li)。光(guang)(guang)(guang)(guang)耦(ou)(ou)隔(ge)(ge)(ge)離(li)(li)的(de)作(zuo)用(yong)(yong)主(zhu)要有(you)兩點(dian):1、隔(ge)(ge)(ge)離(li)(li)作(zuo)用(yong)(yong):光(guang)(guang)(guang)(guang)耦(ou)(ou)可以(yi)起到信號(hao)(hao)的(de)隔(ge)(ge)(ge)離(li)(li)作(zuo)用(yong)(yong),因此(ci)光(guang)(guang)(guang)(guang)耦(ou)(ou)隔(ge)(ge)(ge)離(li)(li)傳(chuan)輸(shu)(shu)(shu)(shu)出(chu)來的(de)信號(hao)(hao)有(you)著(zhu)單向傳(chuan)輸(shu)(shu)(shu)(shu)的(de)特點(dian),因此(ci)可以(yi)實(shi)(shi)現(xian)信號(hao)(hao)的(de)單向傳(chuan)輸(shu)(shu)(shu)(shu),從而使(shi)得輸(shu)(shu)(shu)(shu)入端(duan)(duan)以(yi)及輸(shu)(shu)(shu)(shu)出(chu)端(duan)(duan)實(shi)(shi)現(xian)了(le)電(dian)氣(qi)隔(ge)(ge)(ge)離(li)(li)。輸(shu)(shu)(shu)(shu)出(chu)線(xian)號(hao)(hao)對于(yu)輸(shu)(shu)(shu)(shu)入端(duan)(duan)不會產生影響,抗干(gan)擾的(de)能力(li)強(qiang),并且工作(zuo)穩(wen)定。2、電(dian)平轉換(huan)作(zuo)用(yong)(yong):光(guang)(guang)(guang)(guang)耦(ou)(ou)隔(ge)(ge)(ge)離(li)(li)還可以(yi)實(shi)(shi)現(xian)電(dian)平的(de)轉換(huan)作(zuo)用(yong)(yong)。就好比單片(pian)機(ji)是采用(yong)(yong)3.3伏進行供(gong)電(dian)的(de),那么我們(men)就需要輸(shu)(shu)(shu)(shu)出(chu)5伏電(dian)壓的(de)方波,從而確(que)保(bao)光(guang)(guang)(guang)(guang)耦(ou)(ou)隔(ge)(ge)(ge)離(li)(li)起到了(le)電(dian)平轉換(huan)作(zuo)用(yong)(yong)。光(guang)(guang)(guang)(guang)耦(ou)(ou)隔(ge)(ge)(ge)離(li)(li)具(ju)有(you)占空比任意(yi)可調(diao)、隔(ge)(ge)(ge)離(li)(li)耐壓高(gao)(gao)、抗干(gan)擾能力(li)強(qiang)、抗干(gan)擾能力(li)強(qiang)廣(guang)等優點(dian),不過它(ta)同(tong)樣也存(cun)在傳(chuan)輸(shu)(shu)(shu)(shu)延(yan)遲(chi)較(jiao)大(da)、開關速度較(jiao)慢、成本較(jiao)高(gao)(gao)等缺點(dian)。