CS218-55P

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Thyristors, also known as silicon controlled rectifiers (SCRs), are widely used in AC power controls, such as motor speed control, dimmer control and lamp control. A CS218-55P is a type of SCR. This article will discuss its application field and working principle.

Application Field

The CS218-55P is particularly designed for controlling large AC loads in heavy duty applications. The thyristor can safely handle an AC power of up to 55Amps and an 1800V peak Inverse Voltage (PIV) in passive mode. It can also be used in a lively mode with a 690V peak Inverse Voltage (PIV). These features make it suitable for applications like welding machines, furnaces, electric ranges and ovens.

The CS218-55P is also suitable for motor speed control. When used as a motor speed control device, the CS218-55P will regulate the voltage and current to the motor, allowing for increased or decreased speed. This versatile thyristor can also be used for controlling pumps, chemical processes and other AC applications.

Working Principle

In the simplest terms, the working principle of a CS218-55P thyristor is based on the presence or absence of a gate current. When there is no gate current, the thyristor will remain off. Conversely, if a gate current is present, the thyristor will turn on. Once the thyristor is turned on, its output current will be limited only by the load’s resistance.

The CS218-55P thyristor is designed to be triggered by a positive voltage applied to the gate terminal. When the voltage is greater than the gate trigger voltage, the thyristor will turn on and the anode current will flow through the load. The current can only be turned off when the gate voltage is reversed (negative), or it can be controlled by reducing the current through the gate. Once the thyristor is turned off, it must be re-triggered before current can flow through it again.

The CS218-55P thyristor also has a built-in over-current protection. This feature prevents the thyristor from being damaged by excessive current. When the current is too high, the thyristor automatically turns off and the current is interrupted. The resistor connected in parallel with the thyristor limits the rate of current rise in the thyristor.

Conclusion

The CS218-55P thyristor is a popular choice for AC power control. Its ability to handle large AC loads and its over-current protection make it a safe and reliable device for many AC applications. The thyristor can be used for motor speed control, welding machines, furnaces, electric ranges and ovens, and many more AC power controlling tasks.

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