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Differences between opto-couplers, photo-couplers & photodarlington opto-couplers ?

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dineshdeshmuk

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Differences between opto-couplers, photo-couplers & photodarlington opto-couplers ?

Differences between opto-couplers, photo-couplers & photodarlington opto-couplers ?

Advantages & Disadvantages of these ?

thanks
 

Re: Differences between opto-couplers, photo-couplers & photodarlington opto-couplers

Optocouplers (Optically Coupled) and Fotocouplers (Photocouplers) are same thing. Fotodarlington coupler have a Darlington Transistor in its output.Here are the images of a transistor output Optocoupler and a Darlington Transistor output Optocoupler.
Photo.jpg
Photo1.jpg
 
Re: Differences between opto-couplers, photo-couplers & photodarlington opto-couplers

" In electronics, an opto-isolator, also called an optocoupler, photocoupler, or optical isolator, is "an electronic device designed to transfer electrical signals by utilizing light waves to provide coupling with electrical isolation between its input and output"

The Photodarligton opto-couplers have a darligton transistor coupled with photo-sensor instead of a simple transistor at their output for carrying higher loads and better isolation.
 
Re: Differences between opto-couplers, photo-couplers & photodarlington opto-couplers

Isolation is not dependent on output device category. For example TCED4100 has a darlington output and CNY17 has a transistor output but both have 5000 volts isolation value. The optocouplers have a lot of different output devices but Isolation Voltage may be same, as the output device may be an IGBT, a thyristor, a TRIAC, a linear or a Logic level device, etc.
The darlington in the output device compared to a transistor gives a better power handling.
Hope I could make clear a bit.
 
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