一、光耦的作用是什么

光(guang)(guang)(guang)(guang)(guang)耦(ou)(ou)是光(guang)(guang)(guang)(guang)(guang)電(dian)(dian)(dian)耦(ou)(ou)合器(qi)(qi)的(de)(de)(de)簡稱，又叫光(guang)(guang)(guang)(guang)(guang)耦(ou)(ou)合器(qi)(qi)，是以(yi)光(guang)(guang)(guang)(guang)(guang)為媒(mei)介(jie)傳(chuan)輸(shu)電(dian)(dian)(dian)信號(hao)(hao)(hao)的(de)(de)(de)一種電(dian)(dian)(dian)一光(guang)(guang)(guang)(guang)(guang)一電(dian)(dian)(dian)轉換(huan)器(qi)(qi)件，它通過發光(guang)(guang)(guang)(guang)(guang)二(er)極管（LED）、受控(kong)光(guang)(guang)(guang)(guang)(guang)源(yuan)或激光(guang)(guang)(guang)(guang)(guang)作(zuo)為光(guang)(guang)(guang)(guang)(guang)源(yuan)，將輸(shu)入(ru)(ru)的(de)(de)(de)電(dian)(dian)(dian)信號(hao)(hao)(hao)轉換(huan)成光(guang)(guang)(guang)(guang)(guang)信號(hao)(hao)(hao)輸(shu)出，以(yi)實(shi)現電(dian)(dian)(dian)信號(hao)(hao)(hao)的(de)(de)(de)調(diao)制(zhi)與轉換(huan)，其主要作(zuo)用(yong)有：1、有效隔離(li)電(dian)(dian)(dian)氣上的(de)(de)(de)輸(shu)入(ru)(ru)和輸(shu)出電(dian)(dian)(dian)路(lu)。2、使信號(hao)(hao)(hao)可(ke)以(yi)以(yi)光(guang)(guang)(guang)(guang)(guang)的(de)(de)(de)形式(shi)傳(chuan)輸(shu)，具有良(liang)好的(de)(de)(de)抗干擾效果(guo)。3、起保護(hu)作(zuo)用(yong)，當光(guang)(guang)(guang)(guang)(guang)耦(ou)(ou)合器(qi)(qi)的(de)(de)(de)輸(shu)入(ru)(ru)側受到強電(dian)(dian)(dian)壓沖擊(ji)而(er)損壞時，由于光(guang)(guang)(guang)(guang)(guang)耦(ou)(ou)合器(qi)(qi)的(de)(de)(de)隔離(li)作(zuo)用(yong)，不(bu)會損壞輸(shu)出側電(dian)(dian)(dian)路(lu)。

二、光耦工作原理是什么

光(guang)(guang)(guang)(guang)耦合器(qi)(qi)(qi)(qi)一(yi)般(ban)由光(guang)(guang)(guang)(guang)的(de)(de)(de)發(fa)(fa)射部分（發(fa)(fa)光(guang)(guang)(guang)(guang)器(qi)(qi)(qi)(qi)件(jian)(jian)(jian)）、接收(shou)部分（光(guang)(guang)(guang)(guang)敏器(qi)(qi)(qi)(qi)件(jian)(jian)(jian)）以及信號(hao)(hao)放大(da)部分（電(dian)(dian)子電(dian)(dian)路(lu)）三部分組(zu)成，其工(gong)作(zuo)原理是：以發(fa)(fa)光(guang)(guang)(guang)(guang)器(qi)(qi)(qi)(qi)件(jian)(jian)(jian)的(de)(de)(de)管腳為輸(shu)入端(duan)，光(guang)(guang)(guang)(guang)敏器(qi)(qi)(qi)(qi)件(jian)(jian)(jian)的(de)(de)(de)管腳為輸(shu)出(chu)(chu)(chu)端(duan)，工(gong)作(zuo)時把電(dian)(dian)信號(hao)(hao)加到輸(shu)入端(duan)，使發(fa)(fa)光(guang)(guang)(guang)(guang)器(qi)(qi)(qi)(qi)件(jian)(jian)(jian)的(de)(de)(de)芯體(ti)發(fa)(fa)光(guang)(guang)(guang)(guang)，而(er)(er)光(guang)(guang)(guang)(guang)敏器(qi)(qi)(qi)(qi)件(jian)(jian)(jian)受光(guang)(guang)(guang)(guang)照(zhao)后(hou)產(chan)生光(guang)(guang)(guang)(guang)電(dian)(dian)流(liu)并經電(dian)(dian)子電(dian)(dian)路(lu)放大(da)后(hou)輸(shu)出(chu)(chu)(chu)，實現電(dian)(dian)→光(guang)(guang)(guang)(guang)→電(dian)(dian)的(de)(de)(de)轉換，從(cong)而(er)(er)起到輸(shu)入、輸(shu)出(chu)(chu)(chu)、隔(ge)離的(de)(de)(de)作(zuo)用。簡單(dan)來(lai)說，就(jiu)是輸(shu)入的(de)(de)(de)電(dian)(dian)信號(hao)(hao)驅動發(fa)(fa)光(guang)(guang)(guang)(guang)二極管，使之發(fa)(fa)出(chu)(chu)(chu)一(yi)定波長的(de)(de)(de)光(guang)(guang)(guang)(guang)，被光(guang)(guang)(guang)(guang)探測(ce)器(qi)(qi)(qi)(qi)接收(shou)而(er)(er)產(chan)生光(guang)(guang)(guang)(guang)電(dian)(dian)流(liu)，再經過進一(yi)步(bu)放大(da)后(hou)輸(shu)出(chu)(chu)(chu)，這就(jiu)完成了電(dian)(dian)→光(guang)(guang)(guang)(guang)→電(dian)(dian)的(de)(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)耦是(shi)光(guang)(guang)(guang)(guang)電(dian)(dian)耦合器，用(yong)(yong)于(yu)實現光(guang)(guang)(guang)(guang)電(dian)(dian)轉(zhuan)(zhuan)換(huan)(huan)(huan)(huan)，光(guang)(guang)(guang)(guang)耦隔(ge)(ge)(ge)離(li)(li)(li)，顧名思義就(jiu)是(shi)利用(yong)(yong)光(guang)(guang)(guang)(guang)耦合器進行隔(ge)(ge)(ge)離(li)(li)(li)，常(chang)用(yong)(yong)于(yu)信(xin)(xin)號隔(ge)(ge)(ge)離(li)(li)(li)或光(guang)(guang)(guang)(guang)電(dian)(dian)的(de)(de)隔(ge)(ge)(ge)離(li)(li)(li)。光(guang)(guang)(guang)(guang)耦隔(ge)(ge)(ge)離(li)(li)(li)的(de)(de)作用(yong)(yong)主要有兩點：1、隔(ge)(ge)(ge)離(li)(li)(li)作用(yong)(yong)：光(guang)(guang)(guang)(guang)耦可(ke)以(yi)(yi)起(qi)(qi)到(dao)信(xin)(xin)號的(de)(de)隔(ge)(ge)(ge)離(li)(li)(li)作用(yong)(yong)，因此光(guang)(guang)(guang)(guang)耦隔(ge)(ge)(ge)離(li)(li)(li)傳輸(shu)(shu)(shu)出來的(de)(de)信(xin)(xin)號有著單(dan)向傳輸(shu)(shu)(shu)的(de)(de)特點，因此可(ke)以(yi)(yi)實現信(xin)(xin)號的(de)(de)單(dan)向傳輸(shu)(shu)(shu)，從而(er)使得輸(shu)(shu)(shu)入(ru)端(duan)以(yi)(yi)及(ji)輸(shu)(shu)(shu)出端(duan)實現了電(dian)(dian)氣隔(ge)(ge)(ge)離(li)(li)(li)。輸(shu)(shu)(shu)出線(xian)號對于(yu)輸(shu)(shu)(shu)入(ru)端(duan)不(bu)會產生影響，抗干擾的(de)(de)能力(li)強，并且工(gong)作穩(wen)定(ding)。2、電(dian)(dian)平(ping)轉(zhuan)(zhuan)換(huan)(huan)(huan)(huan)作用(yong)(yong)：光(guang)(guang)(guang)(guang)耦隔(ge)(ge)(ge)離(li)(li)(li)還(huan)可(ke)以(yi)(yi)實現電(dian)(dian)平(ping)的(de)(de)轉(zhuan)(zhuan)換(huan)(huan)(huan)(huan)作用(yong)(yong)。就(jiu)好(hao)比單(dan)片機是(shi)采用(yong)(yong)3.3伏進行供(gong)電(dian)(dian)的(de)(de)，那么我們就(jiu)需要輸(shu)(shu)(shu)出5伏電(dian)(dian)壓(ya)(ya)的(de)(de)方波，從而(er)確保光(guang)(guang)(guang)(guang)耦隔(ge)(ge)(ge)離(li)(li)(li)起(qi)(qi)到(dao)了電(dian)(dian)平(ping)轉(zhuan)(zhuan)換(huan)(huan)(huan)(huan)作用(yong)(yong)。光(guang)(guang)(guang)(guang)耦隔(ge)(ge)(ge)離(li)(li)(li)具有占空比任意可(ke)調、隔(ge)(ge)(ge)離(li)(li)(li)耐壓(ya)(ya)高(gao)(gao)、抗干擾能力(li)強、抗干擾能力(li)強廣(guang)等優點，不(bu)過它同樣(yang)也存在傳輸(shu)(shu)(shu)延遲(chi)較大(da)、開關速度(du)較慢(man)、成(cheng)本較高(gao)(gao)等缺點。