[ARC5] [Milsurplus] HV Fuses: You Were Right, I Was Wrong.. more

[Peter Gottlieb]

Where I work we make solid state fuses (we call them silicon fuses) but mostly 
for low voltages (under 100 volts).  I have one on my desk which will 
continuously pass 800 amps, max voltage 60 volts, and is bidirectional.  There 
is hardware for fast/gross overloads and a micro which handles the slow reaction 
and allows a precise I^2t curve.  Haven't done it for high voltages but with an 
IGBT, sense resistor and opamp it shouldn't be hard.  For these purposes I would 
just use hardware.  Make sure the action is distinct on/off, protect from 
inductive (perhaps with slope control), and watch out for RF interference.

Peter


On 6/16/2012 12:54 PM, Bruce Long wrote:
> I like the fuse wire idea but $80 a reel is a little hard to swallow.
>
> Ten years ago my job and life situation required a fair bit of travel  At that time fuse wire was off the shelf for just a dollar or two .  Maybe a polite request to overseas hams to do a little shopping trip to the iron mogler would come up with something useful.
>
> Alternatively maybe I should be thinking about designing a cheap reliable solid-state fuse.
>
> What are the specs of the fuse you need?
>
>
>
> ________________________________
>   From: David Stinson<arc5 at ix.netcom.com>
> To: milsurplus at mailman.qth.net; arc5 at mailman.qth.net
> Sent: Saturday, June 16, 2012 11:57 AM
> Subject: Re: [ARC5] [Milsurplus] HV Fuses:  You Were Right, I Was Wrong..  more
>
> Gotta find an alternative.
> $15 a *pop* (pun intended) for the original-type fuse
> is out of the question.  I'll shelve the radio first.
> Too many kids to feed for $15 fuses.
> 73 D.S.
>
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