一、光耦合器由什么組成
光耦合器用于實現電→光→電的轉換,它把發光器件和光敏器件封裝在同一殼體內, 中間通過電→光→電的轉換來傳輸電信號,一般光耦的結(jie)構組成包(bao)括三個部分:
1、光的發射部分
光(guang)(guang)(guang)(guang)的發(fa)射部分主要由發(fa)光(guang)(guang)(guang)(guang)器(qi)(qi)件(jian)構(gou)成,發(fa)光(guang)(guang)(guang)(guang)器(qi)(qi)件(jian)一般都是發(fa)光(guang)(guang)(guang)(guang)二(er)極管(guan),發(fa)光(guang)(guang)(guang)(guang)二(er)極管(guan)加上正向電壓時,能(neng)將(jiang)電能(neng)轉化(hua)為光(guang)(guang)(guang)(guang)能(neng)而發(fa)光(guang)(guang)(guang)(guang),發(fa)光(guang)(guang)(guang)(guang)二(er)極管(guan)可以用(yong)直(zhi)流、交流、脈(mo)沖(chong)等電源驅(qu)動,但發(fa)光(guang)(guang)(guang)(guang)二(er)極管(guan)在使用(yong)時必須加正向電壓。
2、光的接收部分
光的接收(shou)部分主要由(you)光敏(min)器件(jian)構(gou)成(cheng),光敏(min)器件(jian)一般都是光敏(min)晶(jing)體管, 光敏(min)晶(jing)體管是利用 PN 結在施加反(fan)向電壓時(shi),在光線照射下反(fan)向電阻由(you)大變小的原理來(lai)工作的。
3、光的信號放大部分
光的信號放大部分主要由(you)電子(zi)電路等構成。
二、光耦工作原理是什么
光(guang)(guang)(guang)耦(ou)是光(guang)(guang)(guang)電(dian)(dian)(dian)轉換器件(jian),它是一種將(jiang)輸(shu)入的直流(liu)電(dian)(dian)(dian)壓信(xin)(xin)號轉換為(wei)輸(shu)出直流(liu)電(dian)(dian)(dian)壓信(xin)(xin)號的半導體元件(jian),可以將(jiang)輸(shu)入的光(guang)(guang)(guang)電(dian)(dian)(dian)信(xin)(xin)號轉換成(cheng)相應的直流(liu)電(dian)(dian)(dian)信(xin)(xin)號,進(jin)行光(guang)(guang)(guang)電(dian)(dian)(dian)轉換和隔離,那么(me)光(guang)(guang)(guang)耦(ou)是怎么(me)工作的呢?
光耦合器的(de)(de)原理是(shi):以發光(guang)(guang)器(qi)件(jian)(jian)的(de)(de)管腳(jiao)為(wei)輸(shu)(shu)入端,光(guang)(guang)敏(min)器(qi)件(jian)(jian)的(de)(de)管腳(jiao)為(wei)輸(shu)(shu)出端,工作(zuo)時把電(dian)(dian)信號(hao)加到輸(shu)(shu)入端,使發光(guang)(guang)器(qi)件(jian)(jian)的(de)(de)芯(xin)體發光(guang)(guang),而光(guang)(guang)敏(min)器(qi)件(jian)(jian)受(shou)光(guang)(guang)照后產生光(guang)(guang)電(dian)(dian)流并經電(dian)(dian)子電(dian)(dian)路放大后輸(shu)(shu)出,實現(xian)電(dian)(dian)→光(guang)(guang)→電(dian)(dian)的(de)(de)轉換,從而起到輸(shu)(shu)入、輸(shu)(shu)出、隔離的(de)(de)作(zuo)用。
簡單來說,就(jiu)是輸入的(de)電信(xin)號(hao)驅動發光二(er)極管,使之發出一(yi)定波長(chang)的(de)光,被光探測器接收而(er)產生(sheng)光電流,再(zai)經過進一(yi)步放(fang)大后輸出,這就(jiu)完成了電→光→電的(de)轉換。