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Thyristors – SCRs

C50EX500 is an SCR or silicon controlled rectifier with the gate control capabilities. The device is a member of the thyristor family, which falls under the category of a switching device that conducts current when it is triggered. It is used for different applications in AC and DC power control.

Applications

C50EX500 is used in a number of applications including in AC rectification, phase control, lamp dimmer, heater control, motor control and AC power supplies. C50EX500 is also used in controlling power supplies in electrical equipments such as computers and television systems, in voltage regulators and industrial equipment.

Working Principle

C50EX500 is a bidirectional semiconductor switching device that turns a current on and off when it is triggered. It works on the principle of turning a current on and off by controlling the gate current. It consists of four layers of alternating P-type and N-type material, with connections referred to as anode and cathode and an additional gate connection.

It works on the principle of the four layers or four junctions. The operation of the SCR typically starts with the gate terminal. A positive gate current is applied to the gate terminal of the SCR, which attracts majority carriers of holes and electrons to the gate region. This creates a junction between the gate and the anode which is similar to a normal PN Juction diode.

When the anode voltage increases, a forward biased PN junction between the anode and the cathode is established. This in turn current starts increasing and the SCR device conducts just like a normal diode between its anode and cathode. It remains in a conducting mode until the anode current drops below a certain value, which is the holding current.

The SCR switches off when the gate current falls below the cutoff value. This is the basic working of SCR device.

In conclusion

C50EX500 is a four junction thyristor that is used for power control and switching operations. These devices are used in applications such as AC rectification, phase control, lamp dimmer, heater control, motor control and AC power supplies. The devices operate on the principle of applying a gate current to initiate a conducting mode between anode and cathode. The device switches off when the gate current falls below the cutoff value.

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