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盡管市場上的固態繼電器型號規格繁(fan)多，但它們的(de)工作原(yuan)理基(ji)本(ben)上是相似(si)的(de)。主要由輸入（控制）電路(lu)，驅動電路(lu)和(he)輸出（負載）電路(lu)三(san)部(bu)分組成。

武漢安德信高低溫試驗箱固態(tai)(tai)繼(ji)電(dian)(dian)器(qi)的(de)(de)輸(shu)(shu)(shu)入(ru)(ru)電(dian)(dian)路(lu)(lu)是為(wei)輸(shu)(shu)(shu)入(ru)(ru)控(kong)(kong)制信號(hao)提供一個(ge)回路(lu)(lu)，使之成為(wei)固態(tai)(tai)繼(ji)電(dian)(dian)器(qi)的(de)(de)觸(chu)發信號(hao)源(yuan)。固態(tai)(tai)繼(ji)電(dian)(dian)器(qi)的(de)(de)輸(shu)(shu)(shu)入(ru)(ru)電(dian)(dian)路(lu)(lu)多為(wei)直(zhi)流輸(shu)(shu)(shu)入(ru)(ru)，個(ge)別的(de)(de)為(wei)交流輸(shu)(shu)(shu)入(ru)(ru)。直(zhi)流輸(shu)(shu)(shu)入(ru)(ru)電(dian)(dian)路(lu)(lu)又(you)分為(wei)阻性輸(shu)(shu)(shu)入(ru)(ru)和恒流輸(shu)(shu)(shu)入(ru)(ru)。阻性輸(shu)(shu)(shu)入(ru)(ru)電(dian)(dian)路(lu)(lu)的(de)(de)輸(shu)(shu)(shu)入(ru)(ru)控(kong)(kong)制電(dian)(dian)流隨輸(shu)(shu)(shu)入(ru)(ru)電(dian)(dian)壓(ya)呈線性的(de)(de)正向變化。恒流輸(shu)(shu)(shu)入(ru)(ru)電(dian)(dian)路(lu)(lu)，在輸(shu)(shu)(shu)入(ru)(ru)電(dian)(dian)壓(ya)達到一定值時，電(dian)(dian)流不再隨電(dian)(dian)壓(ya)的(de)(de)升(sheng)高(gao)而明顯增大(da)，這(zhe)種繼(ji)電(dian)(dian)器(qi)可(ke)適用(yong)于相當寬的(de)(de)輸(shu)(shu)(shu)入(ru)(ru)電(dian)(dian)壓(ya)范(fan)圍。

固態(tai)(tai)繼(ji)電(dian)(dian)器(qi)的(de)輸出(chu)電(dian)(dian)路(lu)是在觸發(fa)信號的(de)控(kong)制(zhi)下，實現固態(tai)(tai)繼(ji)電(dian)(dian)器(qi)的(de)通斷切換。輸出(chu)電(dian)(dian)路(lu)主要由輸出(chu)器(qi)件(jian)（芯(xin)片）和起瞬態(tai)(tai)抑制(zhi)作用的(de)吸(xi)收(shou)回路(lu)組成，有時還包(bao)括反饋(kui)電(dian)(dian)路(lu)。

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(wen)濕(shi)度(du)控制器與固態繼電(dian)器組(zu)合(he)調節加熱管(guan)與加濕(shi)管(guan)的(de)發熱量。通過PID+固態繼電(dian)器實(shi)現高低(di)溫(wen)試驗(yan)箱箱內(nei)溫(wen)濕(shi)度(du)的(de)穩(wen)定(ding)。