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晶體管

繼電器晶體管驅動驅動電路

發布日期：2022-10-09 點擊率：97

　1.電路原理圖

　　繼電器的工作原理以及驅動電路解析

　　當晶體管用來驅動繼電器時，推薦用NPN三極管。具體電路如下：

　　當輸入高電平時，晶體管T1飽和導通，繼電器線圈通電，觸點吸合。

　　當輸入低電平時，晶體管T1截止，繼電器線圈斷電，觸點斷開。

　　2.電路中各元器件的作用

　　晶體管T1為控制開關。

　　電阻R1主要起限流作用，降低晶體管T1功耗。

　　電阻R2使晶體管T1可靠截止。

　　二極管D1反向續流，為三極管由導通轉向關斷時為繼電器線圈中的提供泄放通路，并將其電壓箝位在+12V上。

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