一、光耦的作用是什么
光(guang)(guang)(guang)(guang)(guang)耦是光(guang)(guang)(guang)(guang)(guang)電耦合器(qi)(qi)(qi)(qi)的(de)(de)簡稱,又叫光(guang)(guang)(guang)(guang)(guang)耦合器(qi)(qi)(qi)(qi),是以(yi)光(guang)(guang)(guang)(guang)(guang)為媒介(jie)傳輸電信(xin)號(hao)(hao)的(de)(de)一種電一光(guang)(guang)(guang)(guang)(guang)一電轉(zhuan)換(huan)器(qi)(qi)(qi)(qi)件,它通過發光(guang)(guang)(guang)(guang)(guang)二極管(LED)、受控光(guang)(guang)(guang)(guang)(guang)源或(huo)激光(guang)(guang)(guang)(guang)(guang)作(zuo)為光(guang)(guang)(guang)(guang)(guang)源,將輸入的(de)(de)電信(xin)號(hao)(hao)轉(zhuan)換(huan)成光(guang)(guang)(guang)(guang)(guang)信(xin)號(hao)(hao)輸出(chu),以(yi)實現(xian)電信(xin)號(hao)(hao)的(de)(de)調制與轉(zhuan)換(huan),其主要(yao)作(zuo)用(yong)有(you):1、有(you)效(xiao)隔(ge)離電氣上的(de)(de)輸入和輸出(chu)電路。2、使(shi)信(xin)號(hao)(hao)可(ke)以(yi)以(yi)光(guang)(guang)(guang)(guang)(guang)的(de)(de)形(xing)式傳輸,具有(you)良好的(de)(de)抗干擾效(xiao)果。3、起保護作(zuo)用(yong),當光(guang)(guang)(guang)(guang)(guang)耦合器(qi)(qi)(qi)(qi)的(de)(de)輸入側受到強電壓沖擊(ji)而(er)損壞時,由(you)于光(guang)(guang)(guang)(guang)(guang)耦合器(qi)(qi)(qi)(qi)的(de)(de)隔(ge)離作(zuo)用(yong),不會(hui)損壞輸出(chu)側電路。
二、光耦工作原理是什么
光(guang)(guang)(guang)耦合器(qi)(qi)一(yi)般由光(guang)(guang)(guang)的(de)(de)發(fa)射部(bu)分(發(fa)光(guang)(guang)(guang)器(qi)(qi)件(jian))、接(jie)收部(bu)分(光(guang)(guang)(guang)敏器(qi)(qi)件(jian))以及信號(hao)放(fang)大(da)部(bu)分(電(dian)(dian)子電(dian)(dian)路(lu))三部(bu)分組(zu)成(cheng),其工作原理是:以發(fa)光(guang)(guang)(guang)器(qi)(qi)件(jian)的(de)(de)管腳為輸入(ru)端,光(guang)(guang)(guang)敏器(qi)(qi)件(jian)的(de)(de)管腳為輸出(chu)端,工作時把電(dian)(dian)信號(hao)加到輸入(ru)端,使發(fa)光(guang)(guang)(guang)器(qi)(qi)件(jian)的(de)(de)芯(xin)體發(fa)光(guang)(guang)(guang),而(er)光(guang)(guang)(guang)敏器(qi)(qi)件(jian)受光(guang)(guang)(guang)照后(hou)產(chan)(chan)生光(guang)(guang)(guang)電(dian)(dian)流并經(jing)電(dian)(dian)子電(dian)(dian)路(lu)放(fang)大(da)后(hou)輸出(chu),實現電(dian)(dian)→光(guang)(guang)(guang)→電(dian)(dian)的(de)(de)轉(zhuan)換(huan),從而(er)起(qi)到輸入(ru)、輸出(chu)、隔離的(de)(de)作用(yong)。簡單來說,就(jiu)是輸入(ru)的(de)(de)電(dian)(dian)信號(hao)驅動發(fa)光(guang)(guang)(guang)二極管,使之發(fa)出(chu)一(yi)定波長的(de)(de)光(guang)(guang)(guang),被光(guang)(guang)(guang)探測器(qi)(qi)接(jie)收而(er)產(chan)(chan)生光(guang)(guang)(guang)電(dian)(dian)流,再經(jing)過進一(yi)步放(fang)大(da)后(hou)輸出(chu),這就(jiu)完成(cheng)了電(dian)(dian)→光(guang)(guang)(guang)→電(dian)(dian)的(de)(de)轉(zhuan)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)(ou)是光(guang)(guang)(guang)(guang)電(dian)(dian)(dian)耦(ou)(ou)(ou)合器,用(yong)(yong)(yong)(yong)于(yu)實(shi)(shi)現(xian)光(guang)(guang)(guang)(guang)電(dian)(dian)(dian)轉(zhuan)換(huan),光(guang)(guang)(guang)(guang)耦(ou)(ou)(ou)隔(ge)離(li),顧名思(si)義就(jiu)(jiu)是利用(yong)(yong)(yong)(yong)光(guang)(guang)(guang)(guang)耦(ou)(ou)(ou)合器進行隔(ge)離(li),常(chang)用(yong)(yong)(yong)(yong)于(yu)信號(hao)隔(ge)離(li)或(huo)光(guang)(guang)(guang)(guang)電(dian)(dian)(dian)的(de)(de)隔(ge)離(li)。光(guang)(guang)(guang)(guang)耦(ou)(ou)(ou)隔(ge)離(li)的(de)(de)作(zuo)(zuo)用(yong)(yong)(yong)(yong)主要(yao)有兩點:1、隔(ge)離(li)作(zuo)(zuo)用(yong)(yong)(yong)(yong):光(guang)(guang)(guang)(guang)耦(ou)(ou)(ou)可(ke)以(yi)起(qi)到(dao)信號(hao)的(de)(de)隔(ge)離(li)作(zuo)(zuo)用(yong)(yong)(yong)(yong),因此光(guang)(guang)(guang)(guang)耦(ou)(ou)(ou)隔(ge)離(li)傳輸(shu)(shu)出來的(de)(de)信號(hao)有著單(dan)向傳輸(shu)(shu)的(de)(de)特點,因此可(ke)以(yi)實(shi)(shi)現(xian)信號(hao)的(de)(de)單(dan)向傳輸(shu)(shu),從而使得(de)輸(shu)(shu)入端以(yi)及輸(shu)(shu)出端實(shi)(shi)現(xian)了電(dian)(dian)(dian)氣隔(ge)離(li)。輸(shu)(shu)出線號(hao)對于(yu)輸(shu)(shu)入端不會產生影(ying)響,抗(kang)干(gan)擾(rao)的(de)(de)能力(li)強,并且(qie)工作(zuo)(zuo)穩定。2、電(dian)(dian)(dian)平轉(zhuan)換(huan)作(zuo)(zuo)用(yong)(yong)(yong)(yong):光(guang)(guang)(guang)(guang)耦(ou)(ou)(ou)隔(ge)離(li)還可(ke)以(yi)實(shi)(shi)現(xian)電(dian)(dian)(dian)平的(de)(de)轉(zhuan)換(huan)作(zuo)(zuo)用(yong)(yong)(yong)(yong)。就(jiu)(jiu)好比(bi)單(dan)片機是采用(yong)(yong)(yong)(yong)3.3伏進行供(gong)電(dian)(dian)(dian)的(de)(de),那么我(wo)們就(jiu)(jiu)需要(yao)輸(shu)(shu)出5伏電(dian)(dian)(dian)壓的(de)(de)方波,從而確保光(guang)(guang)(guang)(guang)耦(ou)(ou)(ou)隔(ge)離(li)起(qi)到(dao)了電(dian)(dian)(dian)平轉(zhuan)換(huan)作(zuo)(zuo)用(yong)(yong)(yong)(yong)。光(guang)(guang)(guang)(guang)耦(ou)(ou)(ou)隔(ge)離(li)具有占空(kong)比(bi)任(ren)意可(ke)調、隔(ge)離(li)耐(nai)壓高、抗(kang)干(gan)擾(rao)能力(li)強、抗(kang)干(gan)擾(rao)能力(li)強廣等優(you)點,不過它同樣也存在傳輸(shu)(shu)延遲較大、開(kai)關速度較慢、成本較高等缺點。