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peter(at)mather.com
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 Posted: Tue Jan 08, 2008 3:15 am Post subject: Power Conditioning circuits |
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Bob
You have explained many times how avionics should be able to withstand the
vagaries of aircraft power without the need for an avionics master. I'm
playing around with some pal based circuits to provide derived information
in the cockpit using the serial outputs from the dynon and GPS. Do you have
a standard circuit you can recommend to take the aircraft power and derive a
safe supply to the electronics. Currently I'm just using a diode to protect
against reverse polarity, a transorb to take out the worst spikes and the
usual 7805 with a couple of capacitors either side of it.
Any info or suggestions gratefully received
Best regards
Peter
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nuckolls.bob(at)cox.net
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| Posted: Tue Jan 08, 2008 11:41 am Post subject: Power Conditioning circuits |
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At 10:56 AM 1/8/2008 +0000, you wrote:
| Quote: |
Bob
You have explained many times how avionics should be able to withstand the
vagaries of aircraft power without the need for an avionics master. I'm
playing around with some pal based circuits to provide derived information
in the cockpit using the serial outputs from the dynon and GPS. Do you
have a standard circuit you can recommend to take the aircraft power and
derive a safe supply to the electronics. Currently I'm just using a diode
to protect against reverse polarity, a transorb to take out the worst
spikes and the usual 7805 with a couple of capacitors either side of it.
Any info or suggestions gratefully received
|
Sure. See:
http://www.aeroelectric.com/Pictures/Schematics/power_conditioning.pdf
This is an excerpt from a program I'm doing for a client
that illustrates the general arrangement for achieving
a variety of power supplies and interfacing them with
aircraft wiring where inputs will be subject to 80v
100 mS spikes, 40V 1-second surge, HIRF, conducted
noise, and lightning.
I think this diagram will get you moving in the right
direction for achieving the desired level of immunity
from the wild-and-wooly critters that roam around
and near airplanes. Study this a bit and come back with
questions.
Bob . . .
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a.s.elliott(at)cox.net
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| Posted: Wed Jan 09, 2008 6:44 am Post subject: Power Conditioning circuits |
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While the time-tested certified aircraft avionics in my plane are probably well able to handle the voltage variations, I am not so sure about the experimental part of the panel. Because I have no round dial gauges at all, I chose to include a 12V automotive computer power supply (DC-DC regulator) between the main bus and those avionics. It keeps them alive during engine start. Here is the little one (90 watts) I used, but there are various versions with differing wattage capabilities. As a side benefit, it outputs regulated 5V I can use to power my iPod and charge my cell phone!
http://www.cappuccinopc.com/parts/p1290.asp
FWIW,
Andy Elliott, Mesa, AZ
N601GE (reserved)
601XL/TD/QB, Corvair, building...
[quote][b]
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gmcjetpilot
Joined: 04 Nov 2006
Posts: 170
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| Posted: Wed Jan 09, 2008 11:49 am Post subject: Power Conditioning circuits |
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| Quote: | From: "Peter Mather" <peter(at)mather.com (peter(at)mather.com)>
Subject: Power Conditioning circuits
>can recommend to take the aircraft power and
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| Quote: | derive a safe supply to the electronics.
Best regards Peter
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Not recommending but this is worth a look.
http://www.miracleantenna.com/Smoothie.htm
I talked to them on the phone. I asked a lot of
questions out of curiosity. They are willing to
explain the operations and design. They claim
it will protect from OV as well as transient spikes.
There is always DC-DC power supplies. I'm sorry
I can't recommend a brand, supplier or model but
if you Google DC-DC power supplies you will find
a lot info and products. These supplies are getting
smaller and lighter and cheaper.
Cheers George
[quote][b]
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