---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 08/22/13: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:38 PM - Re: Failed brownout battery experiment (Eric M. Jones) 2. 07:41 PM - Re: Failed brownout battery experiment (user9253) ________________________________ Message 1 _____________________________________ Time: 05:38:18 PM PST US Subject: AeroElectric-List: Re: Failed brownout battery experiment From: "Eric M. Jones" 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. -------- 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 _____________________________________ Time: 07:41:15 PM PST US Subject: AeroElectric-List: Re: Failed brownout battery experiment From: "user9253" 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 -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=407298#407298 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.