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How does a optoisolator works?

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Anonymous

13y ago
Updated: 8/19/2019

Usually there is an LED and a photo transistor, embedded in the same component. The package is usually a DIL with either 6 pins or four, for single devices.

The idea is, that a signal is sent to the LED and picked up with the transistor, held in a sealed encapulation.

The only connection between the two is LIGHT, no other electrical connection.

So it prodides ultimate isolation to prevent stray voltages getting into sensitive areas.

They are used in switched mode power supplies, to provide a feed back signal between the Low voltage side and the high voltage side.

They are also used in home telephones, to send the 50vac ring signal to the electronic warbler circuit. To isolate the user from any high voltage.

(I have known phones suffering lightning strikes, to have the top blown off the OptoIsolator!).

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Wiki User

13y ago

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