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Fuse model for pspice?

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Malcolm Reeves

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Oct 4, 2001, 4:57:16 PM10/4/01
to
Hi,

I am looking for a fuse model for pspice. I have the intusoft model
but pspice doesn't like it (and it is too late tonight to get my brain
around why). Hence if anyone knows a pspice fuse model it would save
my brain some strain :-).

TIA

...malcolm

--
Malcolm Reeves BSc CEng MIEE MIRSE, Full Circuit Ltd, Chippenham, UK
(mre...@fullcircuit.com, mre...@fullcircuit.co.uk or mre...@iee.org).
Design Service for Analogue/Digital H/W & S/W Railway Signalling and Power
electronics. More details plus freeware, Win95/98 DUN and Pspice tips, see:

http://www.fullcircuit.com or http://www.fullcircuit.co.uk

NEW - VHDL test bench tool

Jim Thompson

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Oct 4, 2001, 6:11:34 PM10/4/01
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On Thu, 04 Oct 2001 21:57:16 +0100, Malcolm Reeves
<mre...@fullcircuit.com> wrote:

|Hi,
|
|I am looking for a fuse model for pspice. I have the intusoft model
|but pspice doesn't like it (and it is too late tonight to get my brain
|around why). Hence if anyone knows a pspice fuse model it would save
|my brain some strain :-).
|
|TIA
|
|...malcolm

Hi Malcolm,

Current-controlled switch with hysteresis? Set so resistance rises
slowly with current, then snap!?

E-mail me the Intusoft model.

(If replying by E-mail please observe obscure method of anti-spam.)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| Jim-T@analog_innovations.com Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

For proper E-mail replies SWAP "-" and "_".

Spehro Pefhany

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Oct 4, 2001, 6:31:59 PM10/4/01
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The renowned Jim Thompson <Jim-T@analog_innovations.com> wrote:

> Current-controlled switch with hysteresis? Set so resistance rises
> slowly with current, then snap!?

I suspect you'd really want to model the element temperature as a function
of the current and time, and set the "snap" at the melting point, so that
you could see how close to failure the fuse is, say, with a loud burst of
music or with the turn-on transient of a power supply. If you're
interested in what happens *after* it blows, you'd have to model the
arcing- which I think is what kills thyristors in line voltage circuits.

There's another factor beyond just instant failure, fuses that are brought
close to melting eventually end up with saggy elements which fail if the
transient is repeated again and again.

Glass fuses, slo-blo, ceramic etc. etc. lots of kinds.

Best regards,
--
Spehro Pefhany --"it's the network..." "The Journey is the reward"
sp...@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
/.-.\
(( * ))
\\ // Please help if you can:
\\\ http://dailynews.yahoo.com/fc/US/Emergency_Information/
//\\\
/// \\\
\/ \/

Jim Thompson

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Oct 4, 2001, 7:31:10 PM10/4/01
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On Thu, 04 Oct 2001 22:31:59 GMT, "Spehro Pefhany"
<sp...@interlog.com> wrote:

|The renowned Jim Thompson <Jim-T@analog_innovations.com> wrote:
|
|> Current-controlled switch with hysteresis? Set so resistance rises
|> slowly with current, then snap!?
|
|I suspect you'd really want to model the element temperature as a function
|of the current and time, and set the "snap" at the melting point, so that
|you could see how close to failure the fuse is, say, with a loud burst of
|music or with the turn-on transient of a power supply. If you're
|interested in what happens *after* it blows, you'd have to model the
|arcing- which I think is what kills thyristors in line voltage circuits.
|
|There's another factor beyond just instant failure, fuses that are brought
|close to melting eventually end up with saggy elements which fail if the
|transient is repeated again and again.
|
|Glass fuses, slo-blo, ceramic etc. etc. lots of kinds.
|
|Best regards,

|Spehro Pefhany

Spehro, Move your "--" down one notch...save me from pasting your
name back in to maintain continuity :-)

Now the fuse: Probably need some way of modeling I^2*t which I think
is what you were alluding to. My fuses *never* sag, I use crowbar
circuits to clear them completely when my switchers go over-voltage...
they flash like a flashbulb and plate out on the glass ;-) Took me
awhile to get the PCB traces just right...for awhile there I could
blow several inches of trace ;-)

qrk

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Oct 4, 2001, 7:54:49 PM10/4/01
to
On Thu, 04 Oct 2001 16:31:10 -0700, Jim Thompson
<Jim-T@analog_innovations.com> wrote:

>On Thu, 04 Oct 2001 22:31:59 GMT, "Spehro Pefhany"
><sp...@interlog.com> wrote:
>
>|The renowned Jim Thompson <Jim-T@analog_innovations.com> wrote:

> My fuses *never* sag, ...

Glad to see you have such well toned fuses Jim!

-
Mark Chun
Santa Barbara, CA

Jim Thompson

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Oct 4, 2001, 8:06:06 PM10/4/01
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On Thu, 04 Oct 2001 23:54:49 GMT, ma...@reson.DELETE.ME.com (qrk)
wrote:

|On Thu, 04 Oct 2001 16:31:10 -0700, Jim Thompson
|<Jim-T@analog_innovations.com> wrote:
|
|>On Thu, 04 Oct 2001 22:31:59 GMT, "Spehro Pefhany"
|><sp...@interlog.com> wrote:
|>
|>|The renowned Jim Thompson <Jim-T@analog_innovations.com> wrote:
|> My fuses *never* sag, ...
|
|Glad to see you have such well toned fuses Jim!
|
|-
|Mark Chun
|Santa Barbara, CA

Why, Of Course !-)

Spehro Pefhany

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Oct 4, 2001, 9:17:33 PM10/4/01
to
The renowned qrk <ma...@reson.delete.me.com> wrote:
> Glad to see you have such well toned fuses Jim!

"perky" ';-)

dalale...@gmail.com

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Jun 8, 2016, 7:39:26 AM6/8/16
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Hello
what is the fuse model on pspice pls
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