What is a SCR ( Silicon Control Rectifier )?

Описание: The SCR is the same type of device used in light dimmers in homes. It has the ability to block all current in one direction (as a diode) but it can be triggered or short-circuited in the opposite direction by applying a signal to its gate leads. Therefore, if we apply a signal to the gate lead just as the forward AC voltage cycle is beginning, we will develop full voltage on the DC bus. If the gate signal is applied halfway through the incoming voltage wave, we will have half voltage on the DC bus. It is by control of these gating signals that we can control the DC bus voltage from zero to full value.

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