CQ220-8NR

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Thyristors (SCRs) and TRIACs have been implemented in many applications due to the advantages offered by their robust switching and controlling capabilities. One such type of device, CQ220-8NR, is a TRIAC that has specific applications and working principles compared to its counterparts. This article will focus on the CQ220-8NR application field and working principle.

CQ220-8NR is a TRIAC utilized to manage the power supply and distribution in high-power AC systems. It is designed to be compatible with a wide range of AC voltages and contains two thyristors that each have three terminals, making it better suited for controlling alternating current as it has no polarity issues. The device has a maximum conduction current of 25A and collector-emitter voltage of 800V. In addition, it also boasts a reliable working temperature range from -40 to 125 °C. The package of CQ220-8NR is TO-220, allowing for it to be used in a wide variety of applications, from industrial to electronic appliances.

However, due to the fact that TRIACs are known for their superior current-sharing capabilities, CQ220-8NR has some advantages that make it stand out from the rest. CQ220-8NR exhibits a low forward voltage drop and a low on-state conduction voltage, meaning it has both a lower power dissipation and a lower power loss. This reduces the total system power requirement and provides a cost-effective solution in applications that require large current-sharing capabilities.

In terms of its working principle, the CQ220-8NR is a bidirectional switching device that is composed of two thyristors. Its main function is to allow the current to flow through it in either direction when it is activated. The CQ220-8NR is triggered into conducting state when the DC gate current exceeds a certain threshold value. This is usually achieved through the application of a low DC voltage to the gate terminal.

In addition, CQ220-8NR can also be used as a dimmer switch in AC systems, as its adjustable conduction capability can be utilized to smoothly adjust the output current. This in turn allows for precise control of the output voltage. To decide where to set the conduction angle, a certain parameter should be used, depending on the voltage of the source, type of load and the strength of the system circuit.

In conclusion, CQ220-8NR is a TRIAC with unique features and applications. Its robust structure and low voltage drop allows it to be used in a wide range of AC systems, providing cost-effective solutions in applications that require large current-sharing capabilities. It is also capable of dimming the output current with its adjustable conduction capability, allowing for precise voltage control. CQ220-8NR is a perfect example of how TRIACs offer many advantages for controlling AC systems.

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