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盡管市場上的固態繼電器型號規格(ge)繁(fan)多，但它們(men)的工作原理基本上是相(xiang)似的。主要(yao)由輸(shu)入（控制）電(dian)路(lu)，驅動電(dian)路(lu)和(he)輸(shu)出（負載）電(dian)路(lu)三部(bu)分(fen)組(zu)成。

武漢安德信高低溫試驗箱固(gu)(gu)態(tai)繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)的輸(shu)入(ru)(ru)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)是為(wei)(wei)輸(shu)入(ru)(ru)控(kong)制信號提供(gong)一(yi)個(ge)(ge)回路(lu)(lu)，使之(zhi)成(cheng)為(wei)(wei)固(gu)(gu)態(tai)繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)的觸發信號源。固(gu)(gu)態(tai)繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)的輸(shu)入(ru)(ru)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)多(duo)為(wei)(wei)直流(liu)輸(shu)入(ru)(ru)，個(ge)(ge)別的為(wei)(wei)交流(liu)輸(shu)入(ru)(ru)。直流(liu)輸(shu)入(ru)(ru)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)又分為(wei)(wei)阻性輸(shu)入(ru)(ru)和恒流(liu)輸(shu)入(ru)(ru)。阻性輸(shu)入(ru)(ru)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)的輸(shu)入(ru)(ru)控(kong)制電(dian)(dian)(dian)(dian)(dian)流(liu)隨(sui)輸(shu)入(ru)(ru)電(dian)(dian)(dian)(dian)(dian)壓(ya)呈線性的正向變化。恒流(liu)輸(shu)入(ru)(ru)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)，在輸(shu)入(ru)(ru)電(dian)(dian)(dian)(dian)(dian)壓(ya)達到一(yi)定值時(shi)，電(dian)(dian)(dian)(dian)(dian)流(liu)不再隨(sui)電(dian)(dian)(dian)(dian)(dian)壓(ya)的升(sheng)高而(er)明顯增大(da)，這種(zhong)繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)可適用于相當寬的輸(shu)入(ru)(ru)電(dian)(dian)(dian)(dian)(dian)壓(ya)范圍。

固態(tai)(tai)繼電器的(de)輸出(chu)電路是在觸發信號的(de)控制下(xia)，實(shi)現固態(tai)(tai)繼電器的(de)通斷切換。輸出(chu)電路主要由(you)輸出(chu)器件（芯片）和起(qi)瞬態(tai)(tai)抑制作用的(de)吸收回路組成，有時(shi)還包(bao)括反饋電路。

武漢安德信制造的高低溫試驗箱、可程式恒溫恒濕試驗箱、步入式恒溫恒濕試驗室主要用TEMI880溫濕(shi)度控制器與固態(tai)繼電器組合(he)調(diao)節加(jia)(jia)熱(re)管(guan)與加(jia)(jia)濕(shi)管(guan)的發熱(re)量。通過(guo)PID+固態(tai)繼電器實現高低溫試驗箱(xiang)箱(xiang)內溫濕(shi)度的穩定。