70TPS12

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Thyristors - SCRs

A SCR or thyristor is a three-terminal semiconductor device used for controlling current in AC circuits and for switching electronic components on and off. It is a four-layer, three-terminal semiconductor device. The SCR is the most common type of thyristor, and is used for a variety of purposes, including hoist and motor control, electrical motor drive, power converter control, and industrial applications.

70TPS12 Application Field

The 70TPS12 is a silicon controlled rectifier (SCR) designed for use as an amplifier, power controller and as an on-off switch. It is a three-terminal device, with the base terminal being the gate, an anode terminal, and a cathode terminal. The anode and cathode terminals control the current flow and the gate acts as a control device. The 70TPS12 can be used in applications such as lamps, welding machines, light dimmers, television equipment, speed controls, and AC motor control.

Working Principle of 70TPS12

An SCR’s working principle is based on the fact that it behaves like an on-off switch.When the gate voltage is less than the anode voltage, no current flows through the device. But as soon as the gate voltage is higher than the anode voltage, the SCR will be turned on and a current flows through the device. The current can only be interrupted by turning off the power source. The 70TPS12 has a rather simple working principle and is therefore suitable for any kind of application where an on-off switch is needed.

Advantages of the 70TPS12

The 70TPS12 is a reliable device with few drawbacks. It handles very high currents and is suitable for a variety of applications. The SCR can switch off at high switching frequencies and can be used in hardswitched AC-DC or DC-DC converters. Its low temperature coefficient and thermal runaway characteristics make it suitable for applications where the switching temperature is an important factor. Moreover, the 70TPS12 is cost effective compared to other types of SCRs.

Disadvantages of the 70TPS12

The main disadvantage of the 70TPS12 is its slow switching speed. The device can take some microseconds to switch ON, which is a relatively long time compared to other types of SCRs. The SCR’s current must be limited so as to prevent it from overheating. This limitation of the current causes the SCR to be less suitable for applications that require high currents. In addition, the SCR is susceptible to current triggering, and therefore, a protective diode should be used in applications requiring more than 10 volts to ensure the protection of the SCR.

Conclusion

The 70TPS12 is a reliable silicon controlled rectifier that can be used in a variety of applications as an on-off switch. It can handle high current flows, has a low temperature coefficient, and is suitable for hard switched AC-DC and DC-DC conversions. The device has few drawbacks, the main one being its slow switching speed and the need to limit its current flow to prevent overheating. However, overall, the 70TPS12 is a cost effective and reliable SCR that can be used in applications such as lamps, welding machines, light dimmers, television equipment, speed controls, and AC motor control.

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