一、光耦的作用是什么
光(guang)(guang)(guang)(guang)耦(ou)是光(guang)(guang)(guang)(guang)電(dian)(dian)(dian)耦(ou)合(he)器(qi)的(de)簡稱(cheng),又叫光(guang)(guang)(guang)(guang)耦(ou)合(he)器(qi),是以(yi)光(guang)(guang)(guang)(guang)為(wei)媒介傳輸(shu)(shu)電(dian)(dian)(dian)信號的(de)一種電(dian)(dian)(dian)一光(guang)(guang)(guang)(guang)一電(dian)(dian)(dian)轉(zhuan)換器(qi)件(jian),它(ta)通過(guo)發光(guang)(guang)(guang)(guang)二極管(LED)、受控光(guang)(guang)(guang)(guang)源(yuan)或(huo)激光(guang)(guang)(guang)(guang)作(zuo)(zuo)為(wei)光(guang)(guang)(guang)(guang)源(yuan),將輸(shu)(shu)入的(de)電(dian)(dian)(dian)信號轉(zhuan)換成光(guang)(guang)(guang)(guang)信號輸(shu)(shu)出(chu)(chu),以(yi)實現電(dian)(dian)(dian)信號的(de)調制(zhi)與(yu)轉(zhuan)換,其主(zhu)要作(zuo)(zuo)用(yong)有(you):1、有(you)效隔離電(dian)(dian)(dian)氣(qi)上的(de)輸(shu)(shu)入和輸(shu)(shu)出(chu)(chu)電(dian)(dian)(dian)路。2、使信號可以(yi)以(yi)光(guang)(guang)(guang)(guang)的(de)形式傳輸(shu)(shu),具有(you)良好的(de)抗(kang)干擾效果。3、起保(bao)護作(zuo)(zuo)用(yong),當(dang)光(guang)(guang)(guang)(guang)耦(ou)合(he)器(qi)的(de)輸(shu)(shu)入側受到(dao)強電(dian)(dian)(dian)壓沖擊而損(sun)壞時,由于光(guang)(guang)(guang)(guang)耦(ou)合(he)器(qi)的(de)隔離作(zuo)(zuo)用(yong),不(bu)會損(sun)壞輸(shu)(shu)出(chu)(chu)側電(dian)(dian)(dian)路。
二、光耦工作原理是什么
光(guang)(guang)(guang)(guang)(guang)(guang)(guang)耦合器(qi)一(yi)(yi)般由(you)光(guang)(guang)(guang)(guang)(guang)(guang)(guang)的(de)(de)發(fa)(fa)射部(bu)(bu)分(fen)(發(fa)(fa)光(guang)(guang)(guang)(guang)(guang)(guang)(guang)器(qi)件)、接(jie)收部(bu)(bu)分(fen)(光(guang)(guang)(guang)(guang)(guang)(guang)(guang)敏器(qi)件)以及信(xin)號放大(da)(da)部(bu)(bu)分(fen)(電(dian)(dian)(dian)子電(dian)(dian)(dian)路)三部(bu)(bu)分(fen)組成(cheng),其工(gong)(gong)作原理是:以發(fa)(fa)光(guang)(guang)(guang)(guang)(guang)(guang)(guang)器(qi)件的(de)(de)管(guan)腳(jiao)為(wei)輸(shu)(shu)(shu)(shu)入端(duan),光(guang)(guang)(guang)(guang)(guang)(guang)(guang)敏器(qi)件的(de)(de)管(guan)腳(jiao)為(wei)輸(shu)(shu)(shu)(shu)出(chu)端(duan),工(gong)(gong)作時把電(dian)(dian)(dian)信(xin)號加(jia)到(dao)輸(shu)(shu)(shu)(shu)入端(duan),使發(fa)(fa)光(guang)(guang)(guang)(guang)(guang)(guang)(guang)器(qi)件的(de)(de)芯體(ti)發(fa)(fa)光(guang)(guang)(guang)(guang)(guang)(guang)(guang),而(er)光(guang)(guang)(guang)(guang)(guang)(guang)(guang)敏器(qi)件受光(guang)(guang)(guang)(guang)(guang)(guang)(guang)照(zhao)后(hou)產生光(guang)(guang)(guang)(guang)(guang)(guang)(guang)電(dian)(dian)(dian)流并經電(dian)(dian)(dian)子電(dian)(dian)(dian)路放大(da)(da)后(hou)輸(shu)(shu)(shu)(shu)出(chu),實(shi)現電(dian)(dian)(dian)→光(guang)(guang)(guang)(guang)(guang)(guang)(guang)→電(dian)(dian)(dian)的(de)(de)轉換,從而(er)起到(dao)輸(shu)(shu)(shu)(shu)入、輸(shu)(shu)(shu)(shu)出(chu)、隔離的(de)(de)作用。簡單來說,就是輸(shu)(shu)(shu)(shu)入的(de)(de)電(dian)(dian)(dian)信(xin)號驅動發(fa)(fa)光(guang)(guang)(guang)(guang)(guang)(guang)(guang)二極管(guan),使之發(fa)(fa)出(chu)一(yi)(yi)定波長的(de)(de)光(guang)(guang)(guang)(guang)(guang)(guang)(guang),被光(guang)(guang)(guang)(guang)(guang)(guang)(guang)探測器(qi)接(jie)收而(er)產生光(guang)(guang)(guang)(guang)(guang)(guang)(guang)電(dian)(dian)(dian)流,再經過(guo)進一(yi)(yi)步放大(da)(da)后(hou)輸(shu)(shu)(shu)(shu)出(chu),這就完(wan)成(cheng)了電(dian)(dian)(dian)→光(guang)(guang)(guang)(guang)(guang)(guang)(guang)→電(dian)(dian)(dian)的(de)(de)轉換。
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)(ou)(ou)是光(guang)(guang)(guang)(guang)電(dian)(dian)(dian)(dian)耦(ou)(ou)(ou)(ou)合器(qi),用于(yu)實(shi)(shi)現光(guang)(guang)(guang)(guang)電(dian)(dian)(dian)(dian)轉換,光(guang)(guang)(guang)(guang)耦(ou)(ou)(ou)(ou)隔(ge)(ge)(ge)離(li)(li),顧(gu)名思義就是利用光(guang)(guang)(guang)(guang)耦(ou)(ou)(ou)(ou)合器(qi)進行隔(ge)(ge)(ge)離(li)(li),常用于(yu)信號(hao)隔(ge)(ge)(ge)離(li)(li)或光(guang)(guang)(guang)(guang)電(dian)(dian)(dian)(dian)的(de)隔(ge)(ge)(ge)離(li)(li)。光(guang)(guang)(guang)(guang)耦(ou)(ou)(ou)(ou)隔(ge)(ge)(ge)離(li)(li)的(de)作(zuo)用主要(yao)有兩點(dian):1、隔(ge)(ge)(ge)離(li)(li)作(zuo)用:光(guang)(guang)(guang)(guang)耦(ou)(ou)(ou)(ou)可以起(qi)到(dao)(dao)信號(hao)的(de)隔(ge)(ge)(ge)離(li)(li)作(zuo)用,因(yin)此光(guang)(guang)(guang)(guang)耦(ou)(ou)(ou)(ou)隔(ge)(ge)(ge)離(li)(li)傳輸(shu)(shu)(shu)(shu)出來的(de)信號(hao)有著單向傳輸(shu)(shu)(shu)(shu)的(de)特點(dian),因(yin)此可以實(shi)(shi)現信號(hao)的(de)單向傳輸(shu)(shu)(shu)(shu),從而使得輸(shu)(shu)(shu)(shu)入(ru)端(duan)以及輸(shu)(shu)(shu)(shu)出端(duan)實(shi)(shi)現了電(dian)(dian)(dian)(dian)氣隔(ge)(ge)(ge)離(li)(li)。輸(shu)(shu)(shu)(shu)出線號(hao)對于(yu)輸(shu)(shu)(shu)(shu)入(ru)端(duan)不會產(chan)生(sheng)影響,抗干(gan)擾(rao)的(de)能力強,并且工作(zuo)穩定(ding)。2、電(dian)(dian)(dian)(dian)平轉換作(zuo)用:光(guang)(guang)(guang)(guang)耦(ou)(ou)(ou)(ou)隔(ge)(ge)(ge)離(li)(li)還可以實(shi)(shi)現電(dian)(dian)(dian)(dian)平的(de)轉換作(zuo)用。就好比單片機是采用3.3伏進行供電(dian)(dian)(dian)(dian)的(de),那么(me)我們就需(xu)要(yao)輸(shu)(shu)(shu)(shu)出5伏電(dian)(dian)(dian)(dian)壓(ya)的(de)方波,從而確保(bao)光(guang)(guang)(guang)(guang)耦(ou)(ou)(ou)(ou)隔(ge)(ge)(ge)離(li)(li)起(qi)到(dao)(dao)了電(dian)(dian)(dian)(dian)平轉換作(zuo)用。光(guang)(guang)(guang)(guang)耦(ou)(ou)(ou)(ou)隔(ge)(ge)(ge)離(li)(li)具(ju)有占(zhan)空比任意可調、隔(ge)(ge)(ge)離(li)(li)耐壓(ya)高(gao)、抗干(gan)擾(rao)能力強、抗干(gan)擾(rao)能力強廣等優點(dian),不過它(ta)同樣也存在傳輸(shu)(shu)(shu)(shu)延遲較大、開(kai)關速度(du)較慢、成本(ben)較高(gao)等缺(que)點(dian)。