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EFIS/EMS Brownout/Reboot: “Voltage Slump Eliminator”

 
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Eric Page



Joined: 15 Feb 2017
Posts: 77

PostPosted: Mon Nov 20, 2017 4:18 pm    Post subject: EFIS/EMS Brownout/Reboot: “Voltage Slump Eliminator” Reply with quote

I’m starting a new thread on this topic in case anyone who might be interested missed the recent discussion, here:

http://forum.matronics.com/viewtopic.php?t=16768062

To recap, I’ve adapted Eric Jones’ design for a voltage slump eliminator (a device to prevent EFIS/EMS brownout/reboot during engine start) and designed a circuit board for it. The schematic (.PDF) is here:

http://forums.matronics.com/download.php?id=44941

An archive (.ZIP) containing the full design files can be downloaded here:

https://preview.tinyurl.com/yajod9m6

So far one member of the forum has expressed a desire for me to build one of these for him, so I’ve ordered a batch of circuit boards. If anyone else wants a complete unit, please let me know so I can order all of the components at once. You can reply to this thread or contact me directly.

The cost should be about $35 each, plus postage to your address. I’ll send a PayPal invoice, along with copies of my receipts, once I know the exact amount for each device and I have them ready to mail.

I’m happy to part with bare circuit boards as well; again, for my cost ($0.55/ea) plus postage.

Eric

P.S. For anyone seeing this in the future, you can contact me directly to see if I have any circuit boards on hand. The PDF schematic file contains a link to Digi-Key that will load a shopping cart with all necessary components.


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Last edited by Eric Page on Sun Dec 10, 2017 1:19 pm; edited 3 times in total
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Eric Page



Joined: 15 Feb 2017
Posts: 77

PostPosted: Tue Nov 28, 2017 12:44 pm    Post subject: Re: EFIS/EMS Brownout/Reboot: “Voltage Slump Eliminator” Reply with quote

Update: Twelve PCBs have arrived. I plan to submit a Digi-Key order for components tomorrow evening. If anyone else is interested in one of these, please let me know ASAP. Again, cost will be about $35 each, plus shipping.

I"m keeping two PCBs for my own future builds and one other is spoken for, so I have nine available for any forum member who wants a complete unit or a bare board. The price for bare boards is my cost ($0.46 ea) + shipping.

I will edit this post in the future as boards are taken to track the number I have left...

Current PCB inventory: 6


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Last edited by Eric Page on Wed Nov 29, 2017 5:51 pm; edited 2 times in total
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user9253



Joined: 28 Mar 2008
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Location: Riley TWP Michigan

PostPosted: Wed Nov 29, 2017 6:00 am    Post subject: Re: EFIS/EMS Brownout/Reboot: “Voltage Slump Eliminator” Reply with quote

Eric, I will take a $35 one.

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Joe Gores
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Eric Page



Joined: 15 Feb 2017
Posts: 77

PostPosted: Wed Nov 29, 2017 10:35 am    Post subject: Re: EFIS/EMS Brownout/Reboot: “Voltage Slump Eliminator” Reply with quote

This post has been deleted. It originally contained links to updated design files which have since been superseded. For the most current files, please see the first post in this thread, above.

Eric


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Last edited by Eric Page on Sun Dec 10, 2017 1:09 pm; edited 2 times in total
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Airdog77



Joined: 24 Nov 2013
Posts: 42
Location: Northern Virginia

PostPosted: Wed Dec 06, 2017 7:49 am    Post subject: Re: EFIS/EMS Brownout/Reboot: “Voltage Slump Eliminator” Reply with quote

Eric,

I'm looking for something like this specifically for my GNS480 GPS. Do you think your Slump Eliminator could handle a 480?

I checked the 480 manual and all I could find on power requirements is a voltage range of 10-36 volts.

If your device can support a 480 during start, then I definitely want one!

Thanks,
Wade


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Wade Parton
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Eric Page



Joined: 15 Feb 2017
Posts: 77

PostPosted: Wed Dec 06, 2017 10:24 am    Post subject: Re: EFIS/EMS Brownout/Reboot: “Voltage Slump Eliminator” Reply with quote

Wade,

I chose capacitors for the device based on another member's request to support an MGL Xtreme EFIS/EMS unit, which draws ~200mA and will operate down to 8V.

Going by the specifications in the installation manual...

http://www.aeroelectric.com/Installation_Data/Garmin/GNS480_IM.pdf

...in section 1.3 on page 1-6, we see that the GNS480 requires a minimum of 10V. Adding the three power inputs (Main, VHF Nav and Comm) together, the total "typical" current draw is 2.12A. Those minimum values probably assume that the boot sequence is complete, the GPS receivers are locked and the processor is mostly idle. It also assumes that it's warm enough that the backlight heater is off; add another 0.8A for the heater in low ambient temps.

With those numbers, the Voltage Slump Eliminator would support a GNS480 for somewhere between 1/2 and 3/4 of a second; so, not very useful.

If it's possible to power only the "Main" input to the GNS480 and leave the VHF Nav and Comm sections unpowered until after engine start, then the situation improves a bit: ~1.1 second.

It would certainly be possible to source much larger supercapacitors and make the circuit work at higher loads, but it would take about 12 Farads to get the same performance at a 2.12A load down to 10V that the 0.625-Farad design achieves at a 200mA load down to 8V. That much capacitance would be significantly larger -- and perhaps heavier -- than a small battery.

In this case, it looks like a lead-acid battery or one of the TCW Li-Fe-PO packs...

http://www.tcwtech.com/ibbs_integrated_backup_battery_system_3ah_6ah.html

...might be your best bet.

Eric


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Last edited by Eric Page on Sun Dec 10, 2017 1:21 pm; edited 1 time in total
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Airdog77



Joined: 24 Nov 2013
Posts: 42
Location: Northern Virginia

PostPosted: Wed Dec 06, 2017 10:57 am    Post subject: Re: EFIS/EMS Brownout/Reboot: “Voltage Slump Eliminator” Reply with quote

Eric,

Thanks for assessing this! I already have TCW's 3AH IBBS, but alas, it's full up Wink

I also looked at their Intelligent Power Stabilizer, and for significantly less cost thought I'd check on your system first. I did note in TCW's IPS install manual that for Garmin GPS units it only calls for hooking up the main power connection, and not the VHF Nav/Com, as you highlighted as well.

As many builders/pilots have noted, I simply don't want to be burning unnecessary fuel while inputing a flight plan.

Thanks!
Wade


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user9253



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Location: Riley TWP Michigan

PostPosted: Wed Dec 06, 2017 2:59 pm    Post subject: Re: EFIS/EMS Brownout/Reboot: “Voltage Slump Eliminator” Reply with quote

Wade,
I think that the new and improved deslumpifier is worth a try with your GNS480. I connected the original design by Eric Jones to my Dynon D-180 and it was borderline. Sometimes it prevented brownout and sometimes not. According to the D-180 installation manual, the D-180 draws 1.5 amps.
1/2 to 3/4 second of protection might be long enough. The starter motor draws lots of current at first. But as it comes up to speed, it draws less and less. So the battery voltage only sags for a short time. Bob N has conducted tests and recorded data pertaining to starter current and voltage sag. Perhaps he will give his opinion on the length of time that the battery voltage sags below 10 volts. If the avionics were wired with dedicated conductors from the battery instead of sharing the current path with the starter motor, then the voltage drop to the avionics would be less. That discrete avionics current path could be accomplished via an E-Bus or a separate relay.


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Airdog77



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PostPosted: Wed Dec 06, 2017 3:39 pm    Post subject: Re: EFIS/EMS Brownout/Reboot: “Voltage Slump Eliminator” Reply with quote

Thanks Joe, good gouge.

My starting circuit and Main/E-Bus feed split right at the master contactor, so I'm thinking that's in line with what you're saying. Moreover, I could connect it right off the battery bus if need be.

Eric - not to barge into your proverbial kitchen and mess up the recipe, but is there any way to squeak just a bit more capacitance out of your/Eric's design?

I'll promise not to hook up the VHF Nav/COM! Wink

Either way, I'll take a unit to test out... but if you could supercharge one just a bit that'd be awesome (of course I'd pay whatever the cost difference is).

Thanks again guys!
Wade


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Eric Page



Joined: 15 Feb 2017
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PostPosted: Sun Dec 10, 2017 1:14 pm    Post subject: Re: EFIS/EMS Brownout/Reboot: “Voltage Slump Eliminator” Reply with quote

Due to a circuit board layout error (which I'm blaming on stray particles from space...) the screw holes in these PCBs are a full diameter out of alignment from the mounting bosses in the enclosures. Fortunately, PCBs are cheap these days, so I've revised the board and ordered new ones. They should be here o/a 16 Dec.

If you downloaded the related archive for this project, please update your files. The PCB CAD file and Gerber files have changed, and there was a minor update to an annotation in the schematic.

To avoid having to update multiple posts if there are further changes, I'm only updating links in the original forum post. Thus, links for the current schematic and design file archive can be found in the first post of this thread, above.

Link for email users: http://forums.matronics.com/viewtopic.php?t=16768408

Eric


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