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hasbroucka(at)yahoo.com
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 Posted: Thu Sep 26, 2013 4:07 am Post subject: De-Slumpifier, Voltage Buffer to Prevent Brownout |
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| Quote: | I built and tested the 12V De-Slumpifier and it behaves very well with no
surprises.
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OK, I'll bite. What is a De-Slumpifier?
| Quote: | The supercaps behave almost exactly
like a 250,000 uF/20V capacitor bank which used to fit into a suitcase.
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I' take a stab that this is a replacement for the typical filter Capacitor
for Alternator, and if so does your device save weight?
Alan ,
HasbrouckA(at)yahoo.com
SeaRey Amphibian, framework and hull assembled and covered. Working on VFR
avionics and wiring (Dynon Skyview full suite)and Paint. Top Priority is
keep it light, and place weight forward!
| Quote: |
I don't have a publishable test protocol, but for general
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Eric M. Jones
Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
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| Posted: Fri Sep 27, 2013 7:03 am Post subject: Re: De-Slumpifier, Voltage Buffer to Prevent Brownout |
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| Quote: | | OK, I'll bite. What is a De-Slumpifier? |
De-Slumpifier: A Supercapacitor device to prevent voltage slumps. Particularly to prevent microprocessors from rebooting when the battery voltage is pulled down trying to start the aircraft.
This particular design is for 12V and has 250,000 uF. It can be modified if you understand what it does, to support many similar applications. I have posted schematics and parts list and my giant giant enormous hand holding a prototype (elsewhere here).
| Quote: | | I'll take a stab that this is a replacement for the typical filter Capacitor for Alternator, and if so does your device save weight? |
A typical filter caps is a pretty small and simple part. You wouldn't save much, I think.
| Quote: | | SeaRey Amphibian, framework and hull assembled and covered. Working on VFR avionics and wiring (Dynon Skyview full suite)and Paint. Top Priority is keep it light, and place weight forward! |
If you aren't using my special Super-8-CCA battery cable, then you haven't yet heard about it. See may website. Buy 50'. Save pounds.
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_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net |
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Fri Oct 04, 2013 6:34 am Post subject: Re: De-Slumpifier, Voltage Buffer to Prevent Brownout |
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Eric sent me his prototype DeSlumpifier for testing on my RV-12. Prior to intalling it, I cranked the engine a few times with the ignition switches shut off. With no internal backup battery, the D-180 re-booted each time the engine was cranked. Next I installed the DeSlumpifier in series with pin 1 of the Dynon D-180 (Master Power). During engine cranking, the D-180 did not re-boot. It continued to operate normally. I repeated the test several times, cranking the engine for two seconds, waiting for 10 seconds, then repeating. In each case, the D-180 continued to operate without re-booting. Next on the agenda is actual starting of the engine and flight testing.
Joe
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Joe Gores |
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Wed Oct 09, 2013 3:42 pm Post subject: Re: De-Slumpifier, Voltage Buffer to Prevent Brownout |
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I went flying yesterday. Before starting the engine, I turned on all electrical loads. After the Dynon D-180 booted up, I checked the fuel pressure from the electric fuel pump. Total full-load master-switch on time was not more than a minute or two. During engine start, the Dynon D-180 rebooted. I gave airplane rides that required 4 more engine starts that day. The DeSlumpifier prevented Dynon reboots on those 4 starts. It seems that the battery must be fully charged for the DeSlumpifier to work. I conclude that the DeSlumpifier works most of the time, but not always, depending on battery charge.
Joe
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Joe Gores |
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Eric M. Jones
Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
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| Posted: Thu Oct 10, 2013 6:02 am Post subject: Re: De-Slumpifier, Voltage Buffer to Prevent Brownout |
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Joe, Thanks for testing the DeSlumpifier.
Bob, Thanks for your comments.
Putting in a DC-DC booster is possible, but it wouldn't be my design choice.
IMHO-- I think that merely adding capacitance may do the trick. When the capacitors discharge, they slump depending on the load requirements. When the battery is at low voltage, the caps may not be charged up to a point where they can supply enough energy for long enough to prevent rebooting.
Adding higher value caps is easy and cheap. Since the recharge time increases too, a judicious increase would be 2X.
So Joe, if you send me the DeSlumpifier back I'll put bigger caps in it and return it.
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net |
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