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| Silicon Controlled Rectifier |
The device is similar to a diode, except that it needs to be switched on with an external voltage applied to the gate during the positive half cycle. Once, the SCR has been trigerred, it "fires" and conducts as long as it is positively biased.
In AC circuits, during the negative half cycle, the SCR switches off automatically.
SCRS find application in applications where the current needs to be controlled. They are used in many electronic equipments, such as inverters, converters, speed controller, etc.