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1. 05:38 PM - Re: Failed brownout battery experiment (Eric M. Jones)
2. 07:41 PM - Re: Failed brownout battery experiment (user9253)
Message 1
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| Subject: | Re: Failed brownout battery experiment |
Most supercap designs seem targeted to electric vehicles or locomotives. Here is
one to keep the Dynon from rebooting during starting. Bob N knows a hundred
times more than I do about the Dynon, but this design should work, or at the very
least provide a starting place for one that will by adding more caps. This
design is for 12V, but a higher voltage design is easy, too.
The advantage of this design is that it is about the size of a pack of chewing
gum and cost about $30. It is easy to build on a perf-board. Add your own features
as you like.
How it works: Ordinarily the power is fed through the DS1 to the Dynon Power Input.
The DS2 supplies power to charge the supercaps through current limiter R1.
each supercap is about .25" high X .800" diameter. Since they are in series,
the stack is actually only 250,000 uF X 20V max. R2-5 are voltage equilizers
and draw 30 mA. R1 dissipates 25W initially when charging the supercaps.
When the bus slumps below the charge voltage of the supercaps, current flows
through DS3 to supply the required power, then gets recharged as above.
BDZ is a bidirectional Zener to keep the Schottkys healthy, but it is optional.
You might want a 3A solid state fuse in the input.
Good luck. Note that this design is experimental and has not been tested.
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Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=407286#407286
Attachments:
http://forums.matronics.com//files/supercap_brownout_preventer_772.pdf
Message 2
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| Subject: | Re: Failed brownout battery experiment |
Thanks Eric. I have already ordered the DC to DC booster from eBay (China). If
that does not work out, I will build your circuit.
Since the Dynon normally is powered through a separate terminal, I believe that
DS-1 can be eliminated and DS-3 can be shorted. Since this circuit will only
be needed for less than a second during engine start, does R1 need to have
such a high wattage rating?
Joe
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Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=407298#407298
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