描述
除了上述几种输出电路外，还有双向晶闸管输出电路，它用光电晶闸管实现隔离。双向晶闸管由关断变为导通的延迟时间小于1ms，由导通变为关断的延迟时间小于10ms。晶闸管在负载电流过小时不能导通，遇到这种情况时可以在负载两端并联电阻。
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