ID104

Series:	*
Part Status:	Obsolete

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Thyristors - SCRs

Thyristors, also called as Silicon Controlled Rectifiers (SCRs), are a type of power semiconductor device with three terminals and capable of switching large electrical currents. The ID104 thyristor is a horizontal type SCR, which is widely used in industries related to electrical power and lighting control, UPS and battery chargers, motor speed control, and many other applications. In this article, we shall discuss the application field and working principle of the ID104 thyristor.

Application Field

The ID104 thyristor is designed for control applications in AC and DC circuits, for both phase control and switching. It is mainly used as a switch in power electronic applications such as load and speed control of induction motors, heating control, battery charging, UPS, and AC/DC phase control. It is widely used in industrial applications such as lighting control, home appliance control, fan speed control, oven control, and refrigerator control. It is also used in small AC/DC electronic circuits such as dimmers, air conditioners, and personal computers. ​

Working Principle

The ID104 thyristor is composed of four regions, namely the P-type base, N-type emitter, N-type main electrode, and collector electrode. The main electrode and the collector electrode are equivalent to the emitter and collector of a transistor. A positive gate current is applied between the gate and the emitter to turn on the thyristor. When the gate current is applied, electrons are injected into the main electrode which makes it n-type. As a result, the PN junction between the base and the main electrode breaks down, thus allowing current to flow from the emitter to the collector.As the main electrode gets n-type, it forms a high-speed diode with the base, preventing any further current from flowing from the base to the main electrode. This property is called latch-up and makes the ID104 thyristor an ideal switch for controlling large AC and DC currents. The ID104 thyristor can be triggered by either a DC or an AC source. It can be turned off by reducing the gate current to a lower level or by reducing the output current below the holding current.

Conclusion

The ID104 thyristor is a power semiconductor device with three terminals, capable of switching large AC and DC currents. Its main applications include industrial and personal electronics, as well as AC and DC power control. It is triggered by a DC or AC gate current, and can be turned off by reducing the gate current or output current. Thanks to its high speed and latch-up characteristics, the ID104 thyristor is widely used in many applications related to power and lighting control, motor speed control, and more.

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