What is the difference between diode and scr

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You can also catch me Instagram — Chetan Shidling. Generally, both SCR and diode is a semiconductor device designed by a combination of p and n-type semiconductor material. A diode is a two-terminal semiconductor electronic device. The most general purpose of diode is to allows an electric current to pass in one direction in forwarding bias while blocking it in the opposite direction. By this, we say diode is a unidirectional device used for rectification means converts alternating current into direct current.

A semiconductor diodes V-I characteristic can be decided by choosing semiconductor materials and the doping impurities are added into the material during manufacture. When the positive terminal of the supply is connected to the anode and the negative terminal of the source is connected to the cathode, the diode becomes a forward biased and it will allow current to flow through it.

When the negative terminal of the supply is connected to the anode and the positive terminal of the source is connected to the cathode, the diode becomes reverse biased and it will not allow current to flow through it.

These techniques are used to introduce the special-purpose diodes that perform many different works. For example, a diode used for the voltage regulator is called a Zenor diode, and the diode used to protect circuits from high voltage surges is called an avalanche diode. Similarly, different types of diodes are used for alternate applications based on the requirement. A silicon control rectifier is a four-layered, three-terminal, and three junction semiconductor device. The SCR does not conduct in this mode even if there is a control signal.

In forward conduction mode, the SCR is connected in forward bias and it is triggered by applying a triggering pulse at its gate terminal. Forward conduction also occurs if the voltage exceeds its breakdown voltage but it is a destructive method and it can damage the device. When the SCR is connected in forward bias i. The reverse-biased junction does not allow the current. When the SCR is in forward conduction mode, removing the gate pulse will not switch it off.

By doing so, the SCR breaks the current flow and goes into blocking mode. A thyristor is a latching device which means when it switches ON it will remain switched ON whether there is a gate signal or not. It only requires a momentary pulse to start conduction. Zero crossing is required to break its conduction state. Since the thyristor does not stop conduction when the gate signal is removed, it needs extra circuitry to turn off the thyristor at command.

SCR is mainly used for controlled rectification and to control the power supplied to any load such as lamp dimming, regulators and motor control. The SCR is used for managing and controlling large power therefore they are rated in Kilowatts.

The following comparison table shows the main differences between a diode and a thyristor SCR. PN Junctions. Forward Blocking. Rectification is the conversion of alternating current AC into direct current DC. Voltage Drop. Power Losses. Voltage Ratings. Power Handling. Your email address will not be published.

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