深圳市科啟達(dá)電子科技有限公司成立至今已經(jīng)二十個(gè)年頭了,本公司有的團(tuán)隊(duì),回收工廠,個(gè)人,公司庫(kù)存呆滯電子呆料。
如;二三極管,電容,電阻,鉭電容,連接器,發(fā)光管,繼電器,模塊,集成電路,IGBT模塊,傳感器,霍爾傳感器,橋堆,單片機(jī),電子元件,晶振,CPU,電源模塊,藍(lán)牙芯片,車(chē)載IC,光耦,高頻管,濾波器,MOS管,抑制二極管,開(kāi)關(guān)三極管,晶體管,射頻IC,電解電容,內(nèi)存,驅(qū)動(dòng)芯片,存儲(chǔ)器IC,運(yùn)算放大器等
1、光耦合器的電流傳輸比(CTR)的允許范圍是50%~200%。這是因?yàn)楫?dāng)CTR<50%時(shí),光耦中的LED就
光纖耦合器需要較大的工作電流(IF>5.0mA),才能正?刂茊纹_(kāi)關(guān)電源IC的占空比,這會(huì)增大光耦的功耗。若CTR>200%,在啟動(dòng)電路或者當(dāng)負(fù)載發(fā)生突變時(shí),有可能將單片開(kāi)關(guān)電源誤觸發(fā),影響正常輸出。2、若用放大器電路去驅(qū)動(dòng)光電耦合器,必須精心設(shè)計(jì),保證它能夠補(bǔ)償耦合器的溫度不穩(wěn)定性和漂移。
2、推薦采用線性光耦合器,其特點(diǎn)是CTR值能夠在一定范圍內(nèi)做線性調(diào)整。
上述使用的光電耦合器時(shí)工作在線性方式下,在光電耦合器的輸入端加控制電壓,在輸出端會(huì)成比例地產(chǎn)生一個(gè)用于進(jìn)一步控制下一級(jí)電路的電壓,是單片機(jī)進(jìn)行閉環(huán)調(diào)節(jié)控制,對(duì)電源輸出起到穩(wěn)壓的作用。
為了徹底阻斷干擾信號(hào)進(jìn)入系統(tǒng),不僅信號(hào)通路要隔離,而且輸入或輸出電路與系統(tǒng)的電源也要隔離,即這些電路分別使用相互獨(dú)立的隔離電源。對(duì)于共模干擾,采用隔離技術(shù),即利用變壓器或線性光電耦合器,將輸入地與輸出地?cái)嚅_(kāi),使干擾沒(méi)有回路而被抑制。在開(kāi)關(guān)電源中,光電耦合器是一個(gè)是非常重要的外圍器件,設(shè)計(jì)者可以充分的利用它的輸入輸出隔離作用對(duì)單片機(jī)進(jìn)行抗干擾設(shè)計(jì),并對(duì)變換器進(jìn)行閉環(huán)穩(wěn)壓調(diào)節(jié)。
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