单向晶闸管的电压过零触发可利用简单的晶体管电路。
The zero voltage trigger for thyristor can be realized with simple transistor circuit.
对于频繁通断的负载，应该选用晶闸管输出或晶体管输出，它们属于无触点元件。
For frequent load-off should be selected output or thyristor output transistors, which are non-contact component.
但晶闸管输出只能用于交流负载，而晶体管输出只能用于直流负载。
But only for the exchange of thyristor output load, and the transistor output can only be used for DC load.
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