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Re: AC switch fault current philosophy

From	Piotr Wyderski <peter.pan@neverland.mil>
Newsgroups	sci.electronics.design
Subject	Re: AC switch fault current philosophy
Date	2017-12-31 10:57 +0100
Organization	ATMAN - ATM S.A.
Message-ID	<p2aca7$v15$1@node1.news.atman.pl> (permalink)
References	<p22o2k$svd$1@dont-email.me> <p2314t$up7$1@dont-email.me> <p237v8$ht5$1@dont-email.me> <86a93e35-224a-4782-9d34-965aea68cd71@googlegroups.com> <p25dcj$6u7$1@dont-email.me>

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Piglet wrote:

> Exactly. Fast turn off makes possible something not possible before.

On the other hand, fast turn-off is necessary in the case of MOSFETs.
The SOAs invariably end at the 10us limit for short-circuit currents
and you don't have much time for any form of sophisticated analysis.
Most often a window comparator, so the device is necessarily on a,
erm, short fuse. This can be a drawback, because the value of I
doesn't matter that much, its I^2*R what causes damage.

> So which is better, a few milli-seconds of hundreds of amperes and which 
> causes a clearly identifiable indication of fault requiring manual 
> intervention to reset - or - a few tens of micro-seconds of tens of 
> amperes and a circuit that automatically resumes when the fault is cleared?

IMHO the best of both: a fast, auto-restarting MOSFET fuse.

	Best regards, Piotr

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AC switch fault current philosophy Piglet <erichpwagner@hotmail.com> - 2017-12-28 12:29 +0000
  Re: AC switch fault current philosophy Phil Allison <pallison49@gmail.com> - 2017-12-28 04:47 -0800
    Re: AC switch fault current philosophy Piglet <erichpwagner@hotmail.com> - 2017-12-28 16:53 +0000
    Re: AC switch fault current philosophy George Herold <gherold@teachspin.com> - 2017-12-28 13:16 -0800
      Re: AC switch fault current philosophy Phil Allison <pallison49@gmail.com> - 2017-12-28 16:51 -0800
  Re: AC switch fault current philosophy "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-12-28 09:03 -0600
    Re: AC switch fault current philosophy Piglet <erichpwagner@hotmail.com> - 2017-12-28 17:00 +0000
      Re: AC switch fault current philosophy Piotr Wyderski <peter.pan@neverland.mil> - 2017-12-28 20:21 +0100
      Re: AC switch fault current philosophy Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-12-28 11:57 -0800
        Re: AC switch fault current philosophy Piglet <erichpwagner@hotmail.com> - 2017-12-29 12:45 +0000
          Re: AC switch fault current philosophy Winfield Hill <hill@rowland.harvard.edu> - 2017-12-29 05:13 -0800
          Re: AC switch fault current philosophy Piotr Wyderski <peter.pan@neverland.mil> - 2017-12-31 10:57 +0100
  Re: AC switch fault current philosophy Don Kuenz <g@crcomp.net> - 2017-12-28 18:45 +0000
    Re: AC switch fault current philosophy "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-12-28 14:16 -0600
      Re: AC switch fault current philosophy Don Kuenz <g@crcomp.net> - 2018-01-03 17:57 +0000
        Re: AC switch fault current philosophy "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-01-03 14:29 -0600
          Re: AC switch fault current philosophy Don Kuenz <g@crcomp.net> - 2018-01-03 20:54 +0000
            Re: AC switch fault current philosophy "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-01-03 15:05 -0600
              Re: AC switch fault current philosophy Don Kuenz <g@crcomp.net> - 2018-01-03 22:07 +0000
    Re: AC switch fault current philosophy pcdhobbs@gmail.com - 2017-12-28 12:27 -0800
      Re: AC switch fault current philosophy tabbypurr@gmail.com - 2017-12-28 13:16 -0800
        Re: AC switch fault current philosophy pcdhobbs@gmail.com - 2017-12-28 14:42 -0800
          Re: AC switch fault current philosophy tabbypurr@gmail.com - 2017-12-28 15:25 -0800
            Re: AC switch fault current philosophy pcdhobbs@gmail.com - 2017-12-28 19:04 -0800
              Re: AC switch fault current philosophy tabbypurr@gmail.com - 2017-12-29 06:20 -0800
              Re: AC switch fault current philosophy George Herold <gherold@teachspin.com> - 2017-12-29 15:48 -0800
                Re: AC switch fault current philosophy krw@notreal.com - 2017-12-29 18:59 -0500
                Re: AC switch fault current philosophy Phil Allison <pallison49@gmail.com> - 2017-12-29 17:03 -0800
                Re: AC switch fault current philosophy Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-12-30 07:49 -0800
                Re: AC switch fault current philosophy tabbypurr@gmail.com - 2017-12-29 19:47 -0800
                Re: AC switch fault current philosophy upsidedown@downunder.com - 2017-12-30 11:42 +0200
                Re: AC switch fault current philosophy Phil Allison <pallison49@gmail.com> - 2017-12-30 02:01 -0800
                Re: AC switch fault current philosophy upsidedown@downunder.com - 2017-12-30 22:12 +0200
                Re: AC switch fault current philosophy tabbypurr@gmail.com - 2017-12-30 15:20 -0800
                Re: AC switch fault current philosophy upsidedown@downunder.com - 2017-12-31 14:12 +0200
                Re: AC switch fault current philosophy Phil Allison <pallison49@gmail.com> - 2017-12-30 16:33 -0800
                Re: AC switch fault current philosophy Phil Allison <pallison49@gmail.com> - 2017-12-31 18:30 -0800
                Re: AC switch fault current philosophy ehsjr <ehsjr@verizon.net> - 2017-12-30 19:00 -0500
                Re: AC switch fault current philosophy Phil Allison <pallison49@gmail.com> - 2017-12-30 21:13 -0800
                Re: AC switch fault current philosophy upsidedown@downunder.com - 2017-12-31 14:36 +0200
                Re: AC switch fault current philosophy Phil Allison <pallison49@gmail.com> - 2017-12-31 04:47 -0800
                Re: AC switch fault current philosophy tabbypurr@gmail.com - 2017-12-31 06:00 -0800
                Re: AC switch fault current philosophy tabbypurr@gmail.com - 2017-12-31 17:39 -0800
                Re: AC switch fault current philosophy Jasen Betts <jasen@xnet.co.nz> - 2018-01-01 04:19 +0000
                Re: AC switch fault current philosophy tabbypurr@gmail.com - 2017-12-31 21:38 -0800
                Re: AC switch fault current philosophy tabbypurr@gmail.com - 2017-12-31 05:54 -0800
                Re: AC switch fault current philosophy ehsjr <ehsjr@verizon.net> - 2018-01-01 22:25 -0500
                Re: AC switch fault current philosophy George Herold <gherold@teachspin.com> - 2018-01-02 06:27 -0800
                Re: AC switch fault current philosophy Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2018-01-02 10:10 -0500
              Re: AC switch fault current philosophy Piotr Wyderski <peter.pan@neverland.mil> - 2017-12-31 11:29 +0100
            Re: AC switch fault current philosophy ehsjr <ehsjr@verizon.net> - 2017-12-30 19:44 -0500
              Re: AC switch fault current philosophy Phil Allison <pallison49@gmail.com> - 2017-12-30 16:52 -0800
                Re: AC switch fault current philosophy ehsjr <ehsjr@verizon.net> - 2017-12-30 23:14 -0500
                Re: AC switch fault current philosophy Phil Allison <pallison49@gmail.com> - 2017-12-30 20:33 -0800
                Re: AC switch fault current philosophy ehsjr <ehsjr@verizon.net> - 2018-01-01 18:11 -0500
                Re: AC switch fault current philosophy Phil Allison <pallison49@gmail.com> - 2018-01-01 17:26 -0800
                Re: AC switch fault current philosophy tabbypurr@gmail.com - 2018-01-01 18:51 -0800
                Re: AC switch fault current philosophy ehsjr <ehsjr@verizon.net> - 2018-01-02 23:51 -0500
              Re: AC switch fault current philosophy tabbypurr@gmail.com - 2017-12-31 05:51 -0800
      Re: AC switch fault current philosophy Don Kuenz <g@crcomp.net> - 2017-12-29 14:19 +0000
      Re: AC switch fault current philosophy glen walpert <nospam@null.void> - 2017-12-29 16:03 +0000
      Re: AC switch fault current philosophy "Paul Hovnanian P.E." <paul@hovnanian.com> - 2017-12-29 20:01 -0800
        Re: AC switch fault current philosophy Michael A Terrell <mike.terrell@earthlink.net> - 2017-12-29 23:49 -0500
  Re: AC switch fault current philosophy Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-12-28 12:48 -0700
  Re: AC switch fault current philosophy George Herold <gherold@teachspin.com> - 2017-12-28 13:28 -0800

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