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Advantages of Optocoupler | disadvantages of Optocoupler

This page covers advantages and disadvantages of Optocoupler. It mentions Optocoupler advantages or benefits and Optocoupler disadvantages or drawbacks.

What is Optocoupler?

Introduction:
It consists of a pair of infrared LED and phototransistor. When signal is applied to infrared LED, it turns ON and consecutively light falls on phototransistor. As a result, phototransistor starts conducting. Here no electric connection between LED and phototransistor of optocoupler.

Optocoupler

• The figure-2 depicts triggering circuit which uses optocoupler. In this circuit, triggering pulses are given to LED of optocoupler.
• Optocouplers are used for various applications which include inverters, SMPS, choppers, AC motor drives etc.

Optocoupler triggering circuit

Benefits or advantages of Optocoupler

Following are the benefits or advantages of Optocoupler:
➨It offers very good response at lower frequencies.
➨Compact and cheaper optocoupler devices are available.

Drawbacks or disadvantages of Optocoupler

Following are the drawbacks or disadvantages of Optocoupler:
➨Optocoupler needs external biasing voltage for its operation.
➨Higher frequency response is poor.



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