一、光耦的作用是什么
光(guang)耦(ou)(ou)是(shi)光(guang)電(dian)(dian)耦(ou)(ou)合器(qi)(qi)的(de)簡稱(cheng),又叫光(guang)耦(ou)(ou)合器(qi)(qi),是(shi)以(yi)(yi)光(guang)為(wei)媒介傳(chuan)輸電(dian)(dian)信號(hao)的(de)一(yi)種(zhong)電(dian)(dian)一(yi)光(guang)一(yi)電(dian)(dian)轉換(huan)(huan)器(qi)(qi)件,它通過發光(guang)二極管(LED)、受控光(guang)源(yuan)或(huo)激光(guang)作(zuo)(zuo)為(wei)光(guang)源(yuan),將輸入(ru)的(de)電(dian)(dian)信號(hao)轉換(huan)(huan)成光(guang)信號(hao)輸出,以(yi)(yi)實現電(dian)(dian)信號(hao)的(de)調制與(yu)轉換(huan)(huan),其主要作(zuo)(zuo)用有(you)(you):1、有(you)(you)效隔離(li)電(dian)(dian)氣上的(de)輸入(ru)和輸出電(dian)(dian)路。2、使(shi)信號(hao)可以(yi)(yi)以(yi)(yi)光(guang)的(de)形式(shi)傳(chuan)輸,具有(you)(you)良好的(de)抗干擾效果(guo)。3、起保護作(zuo)(zuo)用,當光(guang)耦(ou)(ou)合器(qi)(qi)的(de)輸入(ru)側受到強電(dian)(dian)壓沖擊(ji)而損壞時,由于光(guang)耦(ou)(ou)合器(qi)(qi)的(de)隔離(li)作(zuo)(zuo)用,不會損壞輸出側電(dian)(dian)路。
二、光耦工作原理是什么
光(guang)(guang)耦合器(qi)(qi)(qi)一(yi)(yi)般由光(guang)(guang)的(de)發(fa)(fa)射部分(發(fa)(fa)光(guang)(guang)器(qi)(qi)(qi)件)、接收部分(光(guang)(guang)敏(min)器(qi)(qi)(qi)件)以及信號(hao)放(fang)大(da)部分(電(dian)(dian)(dian)(dian)(dian)(dian)子電(dian)(dian)(dian)(dian)(dian)(dian)路)三(san)部分組成,其工作原理是:以發(fa)(fa)光(guang)(guang)器(qi)(qi)(qi)件的(de)管腳為輸(shu)入(ru)端(duan),光(guang)(guang)敏(min)器(qi)(qi)(qi)件的(de)管腳為輸(shu)出(chu)(chu)端(duan),工作時把電(dian)(dian)(dian)(dian)(dian)(dian)信號(hao)加(jia)到輸(shu)入(ru)端(duan),使發(fa)(fa)光(guang)(guang)器(qi)(qi)(qi)件的(de)芯(xin)體發(fa)(fa)光(guang)(guang),而(er)光(guang)(guang)敏(min)器(qi)(qi)(qi)件受(shou)光(guang)(guang)照后產(chan)(chan)生(sheng)光(guang)(guang)電(dian)(dian)(dian)(dian)(dian)(dian)流并經電(dian)(dian)(dian)(dian)(dian)(dian)子電(dian)(dian)(dian)(dian)(dian)(dian)路放(fang)大(da)后輸(shu)出(chu)(chu),實現電(dian)(dian)(dian)(dian)(dian)(dian)→光(guang)(guang)→電(dian)(dian)(dian)(dian)(dian)(dian)的(de)轉換,從而(er)起到輸(shu)入(ru)、輸(shu)出(chu)(chu)、隔離的(de)作用。簡單來說,就(jiu)是輸(shu)入(ru)的(de)電(dian)(dian)(dian)(dian)(dian)(dian)信號(hao)驅(qu)動發(fa)(fa)光(guang)(guang)二(er)極管,使之發(fa)(fa)出(chu)(chu)一(yi)(yi)定(ding)波(bo)長的(de)光(guang)(guang),被光(guang)(guang)探測器(qi)(qi)(qi)接收而(er)產(chan)(chan)生(sheng)光(guang)(guang)電(dian)(dian)(dian)(dian)(dian)(dian)流,再經過進一(yi)(yi)步放(fang)大(da)后輸(shu)出(chu)(chu),這就(jiu)完成了電(dian)(dian)(dian)(dian)(dian)(dian)→光(guang)(guang)→電(dian)(dian)(dian)(dian)(dian)(dian)的(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)耦(ou)(ou)是光(guang)(guang)(guang)電(dian)(dian)(dian)耦(ou)(ou)合器(qi),用于(yu)實(shi)(shi)現(xian)光(guang)(guang)(guang)電(dian)(dian)(dian)轉(zhuan)換(huan)(huan)(huan),光(guang)(guang)(guang)耦(ou)(ou)隔(ge)(ge)(ge)(ge)離(li)(li)(li)(li),顧名思(si)義就(jiu)是利用光(guang)(guang)(guang)耦(ou)(ou)合器(qi)進(jin)行隔(ge)(ge)(ge)(ge)離(li)(li)(li)(li),常用于(yu)信號隔(ge)(ge)(ge)(ge)離(li)(li)(li)(li)或光(guang)(guang)(guang)電(dian)(dian)(dian)的(de)(de)隔(ge)(ge)(ge)(ge)離(li)(li)(li)(li)。光(guang)(guang)(guang)耦(ou)(ou)隔(ge)(ge)(ge)(ge)離(li)(li)(li)(li)的(de)(de)作(zuo)(zuo)(zuo)用主要(yao)有(you)兩點(dian):1、隔(ge)(ge)(ge)(ge)離(li)(li)(li)(li)作(zuo)(zuo)(zuo)用:光(guang)(guang)(guang)耦(ou)(ou)可(ke)以(yi)起到信號的(de)(de)隔(ge)(ge)(ge)(ge)離(li)(li)(li)(li)作(zuo)(zuo)(zuo)用,因此(ci)光(guang)(guang)(guang)耦(ou)(ou)隔(ge)(ge)(ge)(ge)離(li)(li)(li)(li)傳(chuan)輸(shu)(shu)(shu)出來的(de)(de)信號有(you)著單(dan)向(xiang)傳(chuan)輸(shu)(shu)(shu)的(de)(de)特點(dian),因此(ci)可(ke)以(yi)實(shi)(shi)現(xian)信號的(de)(de)單(dan)向(xiang)傳(chuan)輸(shu)(shu)(shu),從而(er)使得輸(shu)(shu)(shu)入端(duan)(duan)以(yi)及輸(shu)(shu)(shu)出端(duan)(duan)實(shi)(shi)現(xian)了(le)電(dian)(dian)(dian)氣隔(ge)(ge)(ge)(ge)離(li)(li)(li)(li)。輸(shu)(shu)(shu)出線號對于(yu)輸(shu)(shu)(shu)入端(duan)(duan)不會產生影響,抗干擾的(de)(de)能(neng)力(li)(li)強,并且工(gong)作(zuo)(zuo)(zuo)穩(wen)定。2、電(dian)(dian)(dian)平(ping)(ping)轉(zhuan)換(huan)(huan)(huan)作(zuo)(zuo)(zuo)用:光(guang)(guang)(guang)耦(ou)(ou)隔(ge)(ge)(ge)(ge)離(li)(li)(li)(li)還可(ke)以(yi)實(shi)(shi)現(xian)電(dian)(dian)(dian)平(ping)(ping)的(de)(de)轉(zhuan)換(huan)(huan)(huan)作(zuo)(zuo)(zuo)用。就(jiu)好比(bi)單(dan)片機(ji)是采(cai)用3.3伏進(jin)行供電(dian)(dian)(dian)的(de)(de),那(nei)么我(wo)們就(jiu)需(xu)要(yao)輸(shu)(shu)(shu)出5伏電(dian)(dian)(dian)壓的(de)(de)方波,從而(er)確保光(guang)(guang)(guang)耦(ou)(ou)隔(ge)(ge)(ge)(ge)離(li)(li)(li)(li)起到了(le)電(dian)(dian)(dian)平(ping)(ping)轉(zhuan)換(huan)(huan)(huan)作(zuo)(zuo)(zuo)用。光(guang)(guang)(guang)耦(ou)(ou)隔(ge)(ge)(ge)(ge)離(li)(li)(li)(li)具有(you)占空比(bi)任意可(ke)調、隔(ge)(ge)(ge)(ge)離(li)(li)(li)(li)耐壓高(gao)、抗干擾能(neng)力(li)(li)強、抗干擾能(neng)力(li)(li)強廣等優點(dian),不過它同樣(yang)也存在(zai)傳(chuan)輸(shu)(shu)(shu)延遲較大、開關速度較慢、成本較高(gao)等缺點(dian)。