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Isolation of USB port

Question asked by fraccaroli.francesco on Dec 2, 2015
I'm using a STM32F4 device and I want to have a VCP on the USB Full speed port. I'm trying to understand how to isolate it, because the device I'm designing is for industrial purposes.
I found many solution that can provide isolation with a internal DCDC (for example LTM2884). Obviously, the more issue is the cost of that component.

In my opinion, the same results could be obtained using optocouplers, using in the isolated side the VBUS furnished by the host that is connecting on my device (it will be a PC). Someone has ever tried something like this? Could be a solution?

Thanks for the advices.