一、光耦的作用是什么
光(guang)(guang)(guang)耦是光(guang)(guang)(guang)電(dian)(dian)耦合(he)器(qi)的(de)簡稱,又叫光(guang)(guang)(guang)耦合(he)器(qi),是以(yi)光(guang)(guang)(guang)為媒介傳(chuan)輸(shu)(shu)電(dian)(dian)信(xin)(xin)號(hao)(hao)的(de)一(yi)種電(dian)(dian)一(yi)光(guang)(guang)(guang)一(yi)電(dian)(dian)轉換器(qi)件,它通過發光(guang)(guang)(guang)二極管(guan)(LED)、受控光(guang)(guang)(guang)源(yuan)或(huo)激光(guang)(guang)(guang)作為光(guang)(guang)(guang)源(yuan),將輸(shu)(shu)入的(de)電(dian)(dian)信(xin)(xin)號(hao)(hao)轉換成光(guang)(guang)(guang)信(xin)(xin)號(hao)(hao)輸(shu)(shu)出(chu),以(yi)實現(xian)電(dian)(dian)信(xin)(xin)號(hao)(hao)的(de)調制與(yu)轉換,其主要作用(yong)有:1、有效隔離電(dian)(dian)氣上的(de)輸(shu)(shu)入和輸(shu)(shu)出(chu)電(dian)(dian)路。2、使信(xin)(xin)號(hao)(hao)可以(yi)以(yi)光(guang)(guang)(guang)的(de)形式傳(chuan)輸(shu)(shu),具有良(liang)好的(de)抗干擾效果。3、起保(bao)護作用(yong),當光(guang)(guang)(guang)耦合(he)器(qi)的(de)輸(shu)(shu)入側受到強電(dian)(dian)壓沖擊(ji)而(er)損(sun)壞時,由于光(guang)(guang)(guang)耦合(he)器(qi)的(de)隔離作用(yong),不會損(sun)壞輸(shu)(shu)出(chu)側電(dian)(dian)路。
二、光耦工作原理是什么
光(guang)(guang)(guang)(guang)耦(ou)合器(qi)(qi)(qi)(qi)(qi)一般由光(guang)(guang)(guang)(guang)的(de)(de)發(fa)(fa)(fa)射部(bu)(bu)分(發(fa)(fa)(fa)光(guang)(guang)(guang)(guang)器(qi)(qi)(qi)(qi)(qi)件(jian))、接(jie)(jie)收部(bu)(bu)分(光(guang)(guang)(guang)(guang)敏器(qi)(qi)(qi)(qi)(qi)件(jian))以(yi)及信(xin)號(hao)(hao)放(fang)大(da)(da)部(bu)(bu)分(電(dian)(dian)(dian)(dian)子(zi)電(dian)(dian)(dian)(dian)路)三部(bu)(bu)分組成,其工(gong)作(zuo)原理是:以(yi)發(fa)(fa)(fa)光(guang)(guang)(guang)(guang)器(qi)(qi)(qi)(qi)(qi)件(jian)的(de)(de)管腳為(wei)輸(shu)(shu)入(ru)端,光(guang)(guang)(guang)(guang)敏器(qi)(qi)(qi)(qi)(qi)件(jian)的(de)(de)管腳為(wei)輸(shu)(shu)出端,工(gong)作(zuo)時把電(dian)(dian)(dian)(dian)信(xin)號(hao)(hao)加(jia)到(dao)(dao)輸(shu)(shu)入(ru)端,使發(fa)(fa)(fa)光(guang)(guang)(guang)(guang)器(qi)(qi)(qi)(qi)(qi)件(jian)的(de)(de)芯體(ti)發(fa)(fa)(fa)光(guang)(guang)(guang)(guang),而(er)光(guang)(guang)(guang)(guang)敏器(qi)(qi)(qi)(qi)(qi)件(jian)受(shou)光(guang)(guang)(guang)(guang)照后產生光(guang)(guang)(guang)(guang)電(dian)(dian)(dian)(dian)流(liu)并經電(dian)(dian)(dian)(dian)子(zi)電(dian)(dian)(dian)(dian)路放(fang)大(da)(da)后輸(shu)(shu)出,實現(xian)電(dian)(dian)(dian)(dian)→光(guang)(guang)(guang)(guang)→電(dian)(dian)(dian)(dian)的(de)(de)轉換,從而(er)起到(dao)(dao)輸(shu)(shu)入(ru)、輸(shu)(shu)出、隔離的(de)(de)作(zuo)用(yong)。簡單來說(shuo),就是輸(shu)(shu)入(ru)的(de)(de)電(dian)(dian)(dian)(dian)信(xin)號(hao)(hao)驅動發(fa)(fa)(fa)光(guang)(guang)(guang)(guang)二極管,使之發(fa)(fa)(fa)出一定波長的(de)(de)光(guang)(guang)(guang)(guang),被光(guang)(guang)(guang)(guang)探測器(qi)(qi)(qi)(qi)(qi)接(jie)(jie)收而(er)產生光(guang)(guang)(guang)(guang)電(dian)(dian)(dian)(dian)流(liu),再經過(guo)進(jin)一步放(fang)大(da)(da)后輸(shu)(shu)出,這就完成了(le)電(dian)(dian)(dian)(dian)→光(guang)(guang)(guang)(guang)→電(dian)(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)耦(ou)是(shi)光(guang)電(dian)(dian)耦(ou)合器,用于實(shi)現光(guang)電(dian)(dian)轉換,光(guang)耦(ou)隔(ge)離(li)(li),顧名思義就是(shi)利用光(guang)耦(ou)合器進行隔(ge)離(li)(li),常用于信號(hao)(hao)隔(ge)離(li)(li)或(huo)光(guang)電(dian)(dian)的隔(ge)離(li)(li)。光(guang)耦(ou)隔(ge)離(li)(li)的作(zuo)(zuo)用主要有兩點(dian):1、隔(ge)離(li)(li)作(zuo)(zuo)用:光(guang)耦(ou)可(ke)以(yi)(yi)(yi)起到信號(hao)(hao)的隔(ge)離(li)(li)作(zuo)(zuo)用,因此光(guang)耦(ou)隔(ge)離(li)(li)傳輸(shu)(shu)出來的信號(hao)(hao)有著單向(xiang)(xiang)傳輸(shu)(shu)的特點(dian),因此可(ke)以(yi)(yi)(yi)實(shi)現信號(hao)(hao)的單向(xiang)(xiang)傳輸(shu)(shu),從(cong)而使得輸(shu)(shu)入端(duan)以(yi)(yi)(yi)及輸(shu)(shu)出端(duan)實(shi)現了(le)電(dian)(dian)氣隔(ge)離(li)(li)。輸(shu)(shu)出線號(hao)(hao)對于輸(shu)(shu)入端(duan)不會產(chan)生(sheng)影(ying)響(xiang),抗干擾的能力(li)強,并且(qie)工作(zuo)(zuo)穩定。2、電(dian)(dian)平轉換作(zuo)(zuo)用:光(guang)耦(ou)隔(ge)離(li)(li)還可(ke)以(yi)(yi)(yi)實(shi)現電(dian)(dian)平的轉換作(zuo)(zuo)用。就好(hao)比單片機是(shi)采用3.3伏進行供(gong)電(dian)(dian)的,那么(me)我們(men)就需要輸(shu)(shu)出5伏電(dian)(dian)壓的方波,從(cong)而確保光(guang)耦(ou)隔(ge)離(li)(li)起到了(le)電(dian)(dian)平轉換作(zuo)(zuo)用。光(guang)耦(ou)隔(ge)離(li)(li)具有占空比任意可(ke)調、隔(ge)離(li)(li)耐壓高、抗干擾能力(li)強、抗干擾能力(li)強廣等優(you)點(dian),不過它同樣也存(cun)在傳輸(shu)(shu)延遲較(jiao)大、開關(guan)速度(du)較(jiao)慢、成本較(jiao)高等缺點(dian)。