可以通过调整输入模拟量来控制输出电压。调压器是调整导通角的，适合所有负载。调功器是过零触发的，调整平均功率的，适合阻性负载。 固态继电器（SSR）是一种无触点电子开关。它具有四个端子，其中两个端子为输入控制端，另外两端为输出受控制端。当在输入端施加控制信号后，即可控制输出端电路中负载的通断。由于使用了光电耦合器，因此输入与输出之间实现了完全的电气隔离。整个器件无可动部件及触点，所以它较之电磁继电器有可靠性高、寿命长，开关速度快，使用方便等一系列优点。过零型的固态继电器还具有零电压开、零电流关的特性，对电网干扰小，可降低感性负载的反电动势，在驱动白炽灯负载时可显著降低浪涌电流。 固态继电器的主要作用是实现无触点接通和断开，也就是他不像交流接触器接通时会有电弧。按我现在用过的固态继电器来说单相的固态继电器，是用DC24v控制单相触点接通和断开，工作原理跟中间继电器一样，24v得电，触点闭合。直流是控制线圈，交流输出控制负载 。
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