Today's Message Index:
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1. 12:26 AM - Re: AeroElectric-List Digest: 8 Msgs - 08/16/13 (Franz Fux)
2. 05:10 AM - Re: Failed brownout battery experiment (user9253)
3. 08:05 AM - Re: Re: Failed brownout battery experiment (Richard Girard)
4. 10:23 AM - Re: Failed brownout battery experiment (nuckollsr)
5. 06:43 PM - Re: Failed brownout battery experiment (user9253)
Message 1
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| Subject: | Re: AeroElectric-List Digest: 8 Msgs - 08/16/13 |
unable to respond to any mail until the 20th of August,
Message 2
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| Subject: | Re: Failed brownout battery experiment |
> AA cells are not well suited to 1+ amp discharge situations but as you've discovered,
D-cells took the hit nicely. A d-cell array is certainly cost attractive
but gives you another battery to maintain.
Actually my successful experiment used 4 AA batteries. Two D batteries did not
keep the D-180 from rebooting, nor did 3 AA. I did not try 3 or 4 D batteries,
mainly because I did not have battery holder.
A capacitor or DC-DC booster will offer a more elegant solution. Or perhaps a
combination of DC booster supplying a higher voltage to a capacitor. Mouser sells
a 25volts 150000uF part number 647-LNR1E154MSE at a reasonable cost. Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=406912#406912
Message 3
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| Subject: | Re: Failed brownout battery experiment |
Thanks Bob, I learned a little more.
I have a day of machining parts, about which I know a fair amount, followed
by removing the fuel filter, which is in the fuel tank and about which I
know next to nothing, from my wife's car. Should things go badly with the
car I can at least reflect on the knowledge that I have learned a little
about the mysteries of electron herding so I can probably learn about in
tank fuel filters and possibly about replacing an in tank fuel pump, too. I
feel better already.
Rick
do not archive
On Fri, Aug 16, 2013 at 10:30 PM, nuckollsr
<bob.nuckolls@aeroelectric.com>wrote:
> bob.nuckolls@aeroelectric.com>
>
> [/quote] Did you mean 14 *volts*? How can you tell that it would support
> that for a half a second brownout?[/quote]
>
>
> The dc-dc converter in consideration is a step-up device with an input
> range of 3-32 volts, an output range of 5-35 volts. The only constraints on
> picking an operating point is to have the output set to always be greater
> than the input . . . which can in this case be as much as 15 volts. So some
> comfortable head-room above 15 is in order. The higher the selection, the
> lower the current demanded by the Dynon's switchmode power supply. 17 would
> probably work too. Here's some input/output combinations the supplier says
> this critter will handle.
>
> Test comparison sample reference:
> Input 3V Output 12V 0.4A 4.8W
> Input 5V Output 12V 0.8A 9.6W
> Input 7.4V Output 12V 1.5A 18W
> Input 12V Output 15V 2A 30W
> Input 12V Output 16V 2A 32W
> Input 12V Output 18V 1.6A 28.8W
> Input 12V Output 19V 1.5A 28.5W
> Input 12V Output 24V 1 A 24W
>
> Our 'target low input' is on the order of 7 v so we're asking the little
> feller to put out 14 watts max with 7v in and some output with headroom
> above 15volts . . . 19 seemed like a handy number.
>
>
> Actually if wired so the converter gets input power only with the starter
> button pushed, we can eliminate the possibility of operation with the
> alternator running. So adjusting for say 15 volts output would suffice for
> the fully charged, unloaded battery case . . . with all bases covered for
> battery voltage profile during cranking . . . especially during starter
> inrush.
>
> Good question.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=406904#406904
>
>
--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
Message 4
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| Subject: | Re: Failed brownout battery experiment |
> Actually my successful experiment used 4 AA batteries. Two D batteries did not
keep the D-180 from rebooting, nor did 3 AA. I did not try 3 or 4 D batteries,
mainly because I did not have battery holder.
> A capacitor or DC-DC booster will offer a more elegant solution. Or perhaps
a combination of DC booster supplying a higher voltage to a capacitor. Mouser
sells a 25volts 150000uF part number 647-LNR1E154MSE at a reasonable cost. Joe
Yeah, a smaller capacitor charged to a higher voltage would probably do it too.
The AA experiment obviously worked but even though their 'sag' under load did
not torpedo the experiment, it's going to affect service life. Consider a
4xD as a soldered up pak with flying leads. I'm pretty sure this would give you
a good service life . . . probably a couple of years as long as your airplane
is not stored in a closed hangar under an Arizona sun.
The dc to dc converter we looked at first set for a 12v output and driven from
the downstream side of your starter button seems pretty elegant.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=406922#406922
Message 5
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| Subject: | Re: Failed brownout battery experiment |
Bob,
Thanks for the advice.
I will use 4 AA batteries temporarily and order a DC-DC booster for a long term
solution. Do you think that the DC-DC converter will come alive and boost the
voltage before the starter contactor energizes the starter motor?
Electronics should be faster than a mechanical device.
Thanks, Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=406941#406941
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