一、光耦的作用是什么
光耦(ou)是(shi)光電(dian)(dian)(dian)(dian)耦(ou)合(he)器(qi)的(de)(de)(de)簡稱,又叫光耦(ou)合(he)器(qi),是(shi)以光為媒介傳(chuan)(chuan)輸(shu)電(dian)(dian)(dian)(dian)信(xin)號(hao)的(de)(de)(de)一(yi)種電(dian)(dian)(dian)(dian)一(yi)光一(yi)電(dian)(dian)(dian)(dian)轉(zhuan)換(huan)器(qi)件,它通(tong)過發光二極(ji)管(LED)、受(shou)控光源或(huo)激光作(zuo)為光源,將(jiang)輸(shu)入(ru)的(de)(de)(de)電(dian)(dian)(dian)(dian)信(xin)號(hao)轉(zhuan)換(huan)成光信(xin)號(hao)輸(shu)出,以實現電(dian)(dian)(dian)(dian)信(xin)號(hao)的(de)(de)(de)調制與轉(zhuan)換(huan),其主要作(zuo)用(yong)有(you)(you):1、有(you)(you)效(xiao)隔(ge)離電(dian)(dian)(dian)(dian)氣上的(de)(de)(de)輸(shu)入(ru)和輸(shu)出電(dian)(dian)(dian)(dian)路。2、使信(xin)號(hao)可以以光的(de)(de)(de)形(xing)式傳(chuan)(chuan)輸(shu),具有(you)(you)良好(hao)的(de)(de)(de)抗干擾效(xiao)果(guo)。3、起保護(hu)作(zuo)用(yong),當光耦(ou)合(he)器(qi)的(de)(de)(de)輸(shu)入(ru)側受(shou)到強電(dian)(dian)(dian)(dian)壓沖(chong)擊而損壞時,由于光耦(ou)合(he)器(qi)的(de)(de)(de)隔(ge)離作(zuo)用(yong),不會(hui)損壞輸(shu)出側電(dian)(dian)(dian)(dian)路。
二、光耦工作原理是什么
光(guang)(guang)(guang)(guang)(guang)(guang)耦合器(qi)一(yi)(yi)般由光(guang)(guang)(guang)(guang)(guang)(guang)的(de)(de)發(fa)射部(bu)分(發(fa)光(guang)(guang)(guang)(guang)(guang)(guang)器(qi)件(jian))、接收部(bu)分(光(guang)(guang)(guang)(guang)(guang)(guang)敏器(qi)件(jian))以及信(xin)號放(fang)大(da)部(bu)分(電(dian)(dian)(dian)子電(dian)(dian)(dian)路)三部(bu)分組成,其(qi)工作(zuo)原理是(shi):以發(fa)光(guang)(guang)(guang)(guang)(guang)(guang)器(qi)件(jian)的(de)(de)管腳(jiao)為(wei)輸(shu)(shu)入端(duan),光(guang)(guang)(guang)(guang)(guang)(guang)敏器(qi)件(jian)的(de)(de)管腳(jiao)為(wei)輸(shu)(shu)出(chu)(chu)端(duan),工作(zuo)時把電(dian)(dian)(dian)信(xin)號加到輸(shu)(shu)入端(duan),使發(fa)光(guang)(guang)(guang)(guang)(guang)(guang)器(qi)件(jian)的(de)(de)芯(xin)體發(fa)光(guang)(guang)(guang)(guang)(guang)(guang),而光(guang)(guang)(guang)(guang)(guang)(guang)敏器(qi)件(jian)受光(guang)(guang)(guang)(guang)(guang)(guang)照后(hou)產生(sheng)光(guang)(guang)(guang)(guang)(guang)(guang)電(dian)(dian)(dian)流并經(jing)電(dian)(dian)(dian)子電(dian)(dian)(dian)路放(fang)大(da)后(hou)輸(shu)(shu)出(chu)(chu),實現電(dian)(dian)(dian)→光(guang)(guang)(guang)(guang)(guang)(guang)→電(dian)(dian)(dian)的(de)(de)轉(zhuan)換(huan),從(cong)而起(qi)到輸(shu)(shu)入、輸(shu)(shu)出(chu)(chu)、隔離的(de)(de)作(zuo)用(yong)。簡單來說,就(jiu)是(shi)輸(shu)(shu)入的(de)(de)電(dian)(dian)(dian)信(xin)號驅動發(fa)光(guang)(guang)(guang)(guang)(guang)(guang)二極管,使之(zhi)發(fa)出(chu)(chu)一(yi)(yi)定波(bo)長的(de)(de)光(guang)(guang)(guang)(guang)(guang)(guang),被(bei)光(guang)(guang)(guang)(guang)(guang)(guang)探測器(qi)接收而產生(sheng)光(guang)(guang)(guang)(guang)(guang)(guang)電(dian)(dian)(dian)流,再經(jing)過(guo)進(jin)一(yi)(yi)步放(fang)大(da)后(hou)輸(shu)(shu)出(chu)(chu),這就(jiu)完成了電(dian)(dian)(dian)→光(guang)(guang)(guang)(guang)(guang)(guang)→電(dian)(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)耦(ou)是光(guang)電(dian)(dian)(dian)(dian)耦(ou)合(he)器,用(yong)(yong)于(yu)實(shi)現光(guang)電(dian)(dian)(dian)(dian)轉換(huan),光(guang)耦(ou)隔(ge)離(li),顧名思義(yi)就是利用(yong)(yong)光(guang)耦(ou)合(he)器進(jin)行隔(ge)離(li),常(chang)用(yong)(yong)于(yu)信(xin)號(hao)隔(ge)離(li)或光(guang)電(dian)(dian)(dian)(dian)的(de)隔(ge)離(li)。光(guang)耦(ou)隔(ge)離(li)的(de)作(zuo)(zuo)(zuo)用(yong)(yong)主要有(you)(you)兩點(dian)(dian)(dian)(dian):1、隔(ge)離(li)作(zuo)(zuo)(zuo)用(yong)(yong):光(guang)耦(ou)可(ke)以起到信(xin)號(hao)的(de)隔(ge)離(li)作(zuo)(zuo)(zuo)用(yong)(yong),因此光(guang)耦(ou)隔(ge)離(li)傳輸(shu)(shu)(shu)出(chu)(chu)(chu)來(lai)的(de)信(xin)號(hao)有(you)(you)著單(dan)向傳輸(shu)(shu)(shu)的(de)特點(dian)(dian)(dian)(dian),因此可(ke)以實(shi)現信(xin)號(hao)的(de)單(dan)向傳輸(shu)(shu)(shu),從而(er)使得輸(shu)(shu)(shu)入端(duan)以及輸(shu)(shu)(shu)出(chu)(chu)(chu)端(duan)實(shi)現了電(dian)(dian)(dian)(dian)氣隔(ge)離(li)。輸(shu)(shu)(shu)出(chu)(chu)(chu)線(xian)號(hao)對于(yu)輸(shu)(shu)(shu)入端(duan)不會產生(sheng)影響,抗(kang)干擾(rao)的(de)能力(li)強(qiang)(qiang),并且工(gong)作(zuo)(zuo)(zuo)穩定。2、電(dian)(dian)(dian)(dian)平(ping)(ping)轉換(huan)作(zuo)(zuo)(zuo)用(yong)(yong):光(guang)耦(ou)隔(ge)離(li)還可(ke)以實(shi)現電(dian)(dian)(dian)(dian)平(ping)(ping)的(de)轉換(huan)作(zuo)(zuo)(zuo)用(yong)(yong)。就好比(bi)(bi)單(dan)片機是采用(yong)(yong)3.3伏(fu)進(jin)行供電(dian)(dian)(dian)(dian)的(de),那么我們就需(xu)要輸(shu)(shu)(shu)出(chu)(chu)(chu)5伏(fu)電(dian)(dian)(dian)(dian)壓(ya)的(de)方波,從而(er)確保光(guang)耦(ou)隔(ge)離(li)起到了電(dian)(dian)(dian)(dian)平(ping)(ping)轉換(huan)作(zuo)(zuo)(zuo)用(yong)(yong)。光(guang)耦(ou)隔(ge)離(li)具有(you)(you)占空比(bi)(bi)任(ren)意可(ke)調、隔(ge)離(li)耐壓(ya)高、抗(kang)干擾(rao)能力(li)強(qiang)(qiang)、抗(kang)干擾(rao)能力(li)強(qiang)(qiang)廣等優點(dian)(dian)(dian)(dian),不過它同(tong)樣也存在傳輸(shu)(shu)(shu)延遲較大、開(kai)關速(su)度較慢、成本較高等缺點(dian)(dian)(dian)(dian)。