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uweka
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Join Date: Jan 2007
Location: Berlin (Germany)
Posts: 332
Good Answers: 1

Opto-isolated USB-interface

07/27/2007 5:51 AM

Hi all,

Is there someone who knows an opto-isolated USB-interface ? I mean a relative simple converter, no USB-to-PC-to-ethernet-to-opto-to-ether...... and so on-solution.
Thanks Uwe

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Pathfinder Tags: USB opto-isolation
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bhankiii
Guru
Engineering Fields - Electrical Engineering - New Member

Join Date: Sep 2006
Location: El Lago, Texas, USA
Posts: 2639
Good Answers: 65
#1

Re: Opto-isolated USB-interface

07/27/2007 11:38 AM

Can you explain why you need opto-isolators? If it's just electrical isolation, I'd recommend using one of the NVE magnetic isolator chips. Much better than optos. Transformer coupling - like is commonly used on ethernet interfaces - might be another approach.
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uweka
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Join Date: Jan 2007
Location: Berlin (Germany)
Posts: 332
Good Answers: 1
#3
In reply to #1

Re: Opto-isolated USB-interface

07/30/2007 5:47 AM

Bhankiii,

yes, it`s "just" electrical isolation, but more than 5kV partial discharge free and with a low coupling capacity of <10pF. Those NVEs are only good for "normal" surroundings, not for HV applications. I found that those manufacturers often brag with isolations of thousands of volts but whwn you read the data sheet its only for 1 second or one minute and VDE approbations only allow use in mains applications up to 250V AC.
Thanks Uwe

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Duce
Active Contributor

Join Date: Jul 2007
Location: Houston, TX
Posts: 23
#2

Re: Opto-isolated USB-interface

07/27/2007 12:14 PM

Uwe,

Isolated converters may be found here.

http://www.bb-elec.com/tech_articles/the_usb_solution.asp

Sounds like you may be looking for a hub. That would be nice.

Luck, Duce
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uweka
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Join Date: Jan 2007
Location: Berlin (Germany)
Posts: 332
Good Answers: 1
#4
In reply to #2

Re: Opto-isolated USB-interface

07/30/2007 5:48 AM

No, Duce, unfortunately they don`t have. Thanks Uwe

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