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Date: Mon, 14 Aug 2017 19:19:29 +0000
From: "Peter Stuge (peter AT stuge DOT se) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Mechanical relay using mosfets?
Message-ID: <20170814191929.GS22159@stuge.se>
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Rob Butts (r DOT butts2 AT gmail DOT com) [via geda-user AT delorie DOT com] wrote:
> I was thinking of using high current mosfets as the relays however since
> I'm connecting in some cases one motor wire (red) to another motor wire
> (white) how do I operate the gate? Can I use a 5V micro?

Maybe consider IGBT[1] parts for the switching.

And consider isolating the IGBT/FET gate driver. Either optically or
e.g. with SiLabs 8630 digital isolators which use RF internally.
More expensive, but push-pull outputs.


//Peter

[1] Fairchild Semiconductor Application Note 9020 "IGBT Basic II"
https://www.fairchildsemi.com/application-notes/AN/AN-9020.pdf