What about a cap? Say something like a 1000uF cap charge to something like
15V, should provide enough juice to ignite (and use a button cell to power
your electronics). TTYL

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Kosmerchock, Steve
> Sent: Monday, March 18, 2002 11:58
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: Current / voltage booster circuit.
>
>
> Dwayne,
>
> It's for a model rocket system. Controls the
> ignition of a second stage and a parachute charge.
> In air flights will last between 15s and 2 minutes
> ideally. Used a 9 volt battery before with a 9A
> peak FET to sink the current works OK, but a 9V
> battery is pretty heavy. Trying to lighten it up while
> keeping a small footprint. Thought about using a
> 12V battery for car alarms but doesn't have enough
> juice. Ignite time is user controlled via dip switches.
> So discharge time could range from 15s to 90s.
>
>
> Steve
>
> -----Original Message-----
> From: Dwayne Reid [mailto:dwayner@PLANET.EON.NET]
> Sent: Monday, March 18, 2002 9:51 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: Current / voltage booster circuit.
>
>
> At 11:41 AM 3/18/02 -0500, M. Adam Davis wrote:
> >It appears that your circuit would be using this 12 watt supply
> >infrequently.  If so you might consider using one of the solenoid driver
> >circuits from the data sheets from linear tech.  Many of their
> >regulators are suitable for this.
> >
> >The idea is to use a low current supply @ 6 or 12v to charge a
> >capacitor.  When the charge is enough it outputs a high (so your uC
> >knows when the supply is ready) and you can turn it on via a simple
> >mosfet or transister circuit.
> >
> >Though 6v @ 2a for a second would be a pretty hefty capacitor.
>
> Yep - so use a 2nd switcher.  Charge a largish capacitor to
> between 18 & 30
> Vdc, then follow that with a switcher to actually generate the 6V.  The
> higher the initial voltage, the smaller the storage cap can be.  30V is
> about as high as you want to go - most simple switchers have a 35V max
> input voltage rating.
>
> Steve - how much warning time to you have?  Do you have to be able to
> deliver that power pulse instantaneously or can you take 30 seconds to
> generate and store the charge required?
>
> dwayne
>
>
> Dwayne Reid   <dwayner@planet.eon.net>
> Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
> (780) 489-3199 voice          (780) 487-6397 fax
>
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