CQ218I-25M

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Thyristors - TRIACs

A TRIAC (Triode for Alternating Current) is a special type of thyristor or silicon controlled rectifier that can both switch on and switch off alternating current such as in a light dimmer or an electric stove. TRIACs can be used to control voltage in many applications, such as motor speed, lighting, heating and power supplies. TRIACs are widely used in a variety of electrical and electronic products. In this article, we will discuss the CQ218I-25M, its application field and working principle.

CQ218I-25M Overview

The CQ218I-25M is a TRIAC with a maximum current rating of 25 amps and a gate trigger voltage rating of 7 volts. It is a single-phase, semiconductor switch specifically designed for low-power applications. The CQ218I-25M is a cost-effective solution for motor speed control, security systems, lighting systems, and small power appliance control.

Application Field

The CQ218I-25M is primarily used in motor speed control applications. It can be used as a variable speed drive for controlling variable frequency AC motors or for controlling the speed of small AC induction motors. It is also used in security and access control systems, as well as in fan controls, and in small appliance control applications.

Working Principle

The CQ218I-25M works by controlling the voltage and current that is provided to an AC motor or appliance. The TRIAC is triggered when the gate voltage is applied to it. When the voltage is applied to the gate, the TRIAC becomes conducting and the current can then flow through the thyristor. The current then passes through the TRIAC, allowing the motor or appliance to be powered. The amount of current that is allowed to pass through the TRIAC is determined by the amount of voltage applied to the gate. By varying the amount of voltage applied to the gate, the amount of current that flows through the TRIAC can be controlled. By controlling the amount of current that flows through the TRIAC, the speed of the motor or appliance can be varied.

Conclusion

The CQ218I-25M is a TRIAC specifically designed for low-power applications. It is primarily used in motor speed control applications, security and access control systems, fan controls, and small appliance control applications. It works by controlling the voltage and current that is provided to an AC motor or appliance. By varying the amount of voltage applied to the gate, the amount of current that flows through the TRIAC can be controlled, and the speed of the motor or appliance can be varied.

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