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Groups > sci.electronics.design > #433537
| From | Winfield Hill <hill@rowland.harvard.edu> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: ping Win, SiC fets |
| Date | 2016-11-02 15:36 -0700 |
| Organization | Rowland Institute |
| Message-ID | <nvdpoi0319h@drn.newsguy.com> (permalink) |
| References | <bfok1c9ijr8oat3h7ggpr7utlmkhsnqa7b@4ax.com> |
John Larkin wrote...
>
> Hey, Win,
>
> I think you were working with high-voltage SiC fets.
> What sort of fall times can you get at 1kV or so?
You could easily get 10ns, faster if you work at it.
I've slowed my 600V switch to 8ns to keep it smooth.
> I want to switch 6 or 7 kV to ground, fast, into a
> 50 ohm load, and need to stack fets. The higher
> the fet voltage, the fewer I need to stack and drive.
Also, 7kV and 50 ohms, with 50-ohm cable, means a
current of 70A. Switching that much current is one
thing, but trying to do it fast means inductive
voltage drops, V = L di/dt, will be a killer. You
can work to keep inductance under control with one
MOSFET and a ground plane, etc., but when you put
them in series, low-inductance paths go to hell.
Dunno, John, that's a very serious game to play.
Behlke does it, but they stick to slower speeds.
--
Thanks,
- Win
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ping Win, SiC fets John Larkin <jjlarkin@highlandtechnology.com> - 2016-11-02 15:17 -0700
Re: ping Win, SiC fets Winfield Hill <hill@rowland.harvard.edu> - 2016-11-02 15:36 -0700
Re: ping Win, SiC fets John Larkin <jjlarkin@highlandtechnology.com> - 2016-11-02 15:58 -0700
Re: ping Win, SiC fets Winfield Hill <hill@rowland.harvard.edu> - 2016-11-02 17:50 -0700
Re: ping Win, SiC fets John Larkin <jjlarkin@highlandtechnology.com> - 2016-11-02 18:02 -0700
Re: ping Win, SiC fets Winfield Hill <hill@rowland.harvard.edu> - 2016-11-02 18:34 -0700
Re: ping Win, SiC fets TTman <pcw1.cad@ntlworld.com> - 2016-11-03 08:52 +0000
Re: ping Win, SiC fets Martin Brown <|||newspam|||@nezumi.demon.co.uk> - 2016-11-03 09:24 +0000
Re: ping Win, SiC fets Jeroen Belleman <jeroen@nospam.please> - 2016-11-03 10:25 +0100
Re: ping Win, SiC fets John S <Sophi.2@invalid.org> - 2016-11-03 07:11 -0500
Re: ping Win, SiC fets Jeroen Belleman <jeroen@nospam.please> - 2016-11-03 14:32 +0100
Re: ping Win, SiC fets Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2016-11-03 09:00 -0700
Re: ping Win, SiC fets John S <Sophi.2@invalid.org> - 2016-11-06 17:47 -0600
Re: ping Win, SiC fets Tom Gardner <spamjunk@blueyonder.co.uk> - 2016-11-03 09:29 +0000
Re: ping Win, SiC fets TTman <pcw1.cad@ntlworld.com> - 2016-11-03 11:43 +0000
Re: ping Win, SiC fets Tom Gardner <spamjunk@blueyonder.co.uk> - 2016-11-03 12:16 +0000
Re: ping Win, SiC fets upsidedown@downunder.com - 2016-11-03 18:56 +0200
Re: ping Win, SiC fets John Larkin <jjlarkin@highlandtechnology.com> - 2016-11-03 08:59 -0700
Re: ping Win, SiC fets Winfield Hill <hill@rowland.harvard.edu> - 2016-11-03 10:40 -0700
Re: ping Win, SiC fets John Larkin <jjlarkin@highlandtechnology.com> - 2016-11-03 11:02 -0700
Re: ping Win, SiC fets Winfield Hill <hill@rowland.harvard.edu> - 2016-11-03 11:29 -0700
Re: ping Win, SiC fets dagmargoodboat@yahoo.com - 2016-11-02 15:42 -0700
Re: ping Win, SiC fets John Larkin <jjlarkin@highlandtechnology.com> - 2016-11-02 15:54 -0700
Re: ping Win, SiC fets dagmargoodboat@yahoo.com - 2016-11-02 17:10 -0700
Re: ping Win, SiC fets Winfield Hill <hill@rowland.harvard.edu> - 2016-11-02 17:53 -0700
Re: ping Win, SiC fets Winfield Hill <hill@rowland.harvard.edu> - 2016-11-02 17:54 -0700
Re: ping Win, SiC fets Cursitor Doom <curd@notformail.com> - 2016-11-03 15:38 +0000
triacs and electronics engineering Winfield Hill <hill@rowland.harvard.edu> - 2016-11-03 10:46 -0700
Re: triacs and electronics engineering Gunther Heiko Hagen <guntherxxx@quantserve.de> - 2016-11-03 18:01 +0000
Re: triacs and electronics engineering John Larkin <jjlarkin@highlandtechnology.com> - 2016-11-03 11:40 -0700
Re: triacs and electronics engineering Jon Elson <jmelson@wustl.edu> - 2016-11-03 13:56 -0500
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