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A Silicon Controlled Rectifier (or semiconductor controlled rectifier) is a 4-layer solid state device that controls current flow. The name "silicon controlled rectifier" is a trade name for the type of thyristor commercialized at General Electric in 1957.

Modes of operation

In the normal 'off' state the device restricts [Reverse leakage current|leakage current]]. When the gate to source current exceeds a certain point, the device turns 'on' and conducts current. The device will remain in the 'on' state even after gate current is removed so long as current through the device remains above the holding current. Once current falls below the holding current the device will switch off. If the applied voltage increases rapidly, it may induce enough leakage current to trigger the device into the on state, but this is harmful to the device. The reverse blocking voltage is limited in any device.

Applications

SCRs are made with voltage ratings of 50 volts to 2500 volts, and with current ratings up to 3000 amperes per device. SCRs are used in power switching, phase control, chopper, battery chargers, and inverter circuits. Industrially they are applied to produce variable DC voltages for motors (from a few to several thousand HP) from AC line voltage. They can also be used in some electric vehicles to modulate the working voltage in a Jacobson circuit. Another common application is phase control circuits used with inductive loads. SCRs can also be found in welding power supplies where they are used to maintain a constant output current or voltage. Large silicon-controlled rectifer assemblies with many individual devices connected in series are used in high-voltage DC converter stations.

Much smaller SCRs are also used as ESD (electrostatic discharge) protection circuits on modern CMOS integrated circuits (see literature).

Literature

Ming-Dou Ker et. al., "Overview of On-Chip Electrostatic Discharge Protection Devices With SCR-Based Devices in CMOS Integrated Circuits", IEEE Transactions on Device and Materials Reliability, vol. 5, no. 2, June 2005.

See also

• Thyristor
• Triac
• Voltage regulator

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