CQ220I-8D

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Thyristors, alternatively known as silicon-controlled rectifiers, are a type of semiconductor with four layers of alternating N-type and P-type materials. These devices act like switches that can conduct electricity when a voltage is applied across the two layers. The CQ220I-8D is a one quadrant triac optical isolator and belongs to the family of thyristors. Although it is made up of different materials than the usual thyristor, the principles it works on is similar to thyristors.

The working principle of the CQ220I-8D is based on the principle of optocoupler. It comprises of an LED light source and an optical detector, forming the core component of this optocoupler. As light from the LED is detected by the optical detector, the triac is triggered leading to conduction of current. Here, the LED acts as a light-sensitive switch for triggering the triac, enabling it to turn on and off as needed.

The CQ220I-8D is a one quadrant triac optical isolator consisting of a silicon controlled rectifier (SCR) and an LED. The LED, when triggered by light, activates a silicon controlled rectifier that serves as the controlling component in the module. The triac consists of two refractory diodes, connected in inverse parallel that essentially makes it a bistable component thereby allowing it to be switched on or off in response to applied gate signal or triggered light.

The in-built light-sensitive switch is capable of accurately adjusting the current flowing in the load, thus a decrease in power is also achieved. By virtue of being a one quadrant triac isolator, the CQ220I-8D allows for a short circuit current rating of 0.12A and a AC load current rating between 0.1A and 0.5A.

The application of this thyristor includes its suitability for applications that require load control at high voltage levels which involve the use of light-sensitive switches. For example, its use in switching inductive loads such as relays, motors and transformers is ideal as it offers a safer way of controlling these expensive and heavy items without the risks of shock hazard or fire hazard. The use of an optocoupler alone ensures that there is complete electrical isolation between the power source and the load.

Apart from providing an electronic control solution while avoiding direct contact with high voltage loads, the CQ220I-8D is also suitable for applications where high current rapid burst are needed, such as in medical imaging with X-ray machines, instead of using mechanical switching or contactors.

In summary, the CQ220I-8D is a one quadrant triac optical isolator that belongs to the family of thyristors. It works on the principle of optocoupler and is suitable for applications that require load control at high voltage levels. It also offers excellent isolation from the high voltage load, thereby reducing the risks of shock hazard or fire hazard, and is also suitable for applications where high current rapid burst are needed.

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