silicon controlled rectifier

SILICON CONTROLLED RECTIFIER (SCR) OR THYRISTOR

The SCR is an unidirectional device and like diode, it allows current to flow in only one direction. but unlike diode, it has built in feature to switch ON and Off.

The switching action of SCR is controlled by the additional input called gate and biasing

This switching property of SCR allows to control the ON periods of the SCR so that the, average power deliver to the load can be controlled.

SCR can be used as a rectifier element like diode to convert AC signal to DC signals.

The SCR is a four layer p-n-p-n device where p and n layer is alternately arranged.

The output layers are heavily doped. there are three p-n junctions namely as j1, j2, j3.

the output P layer is called anode while outer n layer is called cathode middle P layer is called gate

symbol of SCR






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operation of SCR

when the gate is open

when the gate is closed