From: carrotSnack <sci...@ho...> - 2011-01-30 00:21:24
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I'm trying to power my overo tide and summit from a 2S Lipo battery but I'm experiencing some problems. First I tried to use a http://www.pololu.com/catalog/product/2103 switching regulator rated up to 600mA and the gumstix would always reach "Starting kernel ... Uncompressing Linux... done, booting the kernel." then power off. When I replaced the switching regulator with a linear one and also a linear one from BEC it booted up into login no problem. I decided to see how amps it was using during boot on a wall outlet with an adapter to see maybe if it was going above 600mA but when I connect my DMM it stayed between 200-300mA as expected then peaked at ~280mA and the gumstix lost power at the same point it did when using the switching regulator on the battery. The only things I have attatched to my summit board is the power and usb console connection. The regulators are at 5v and my DMM can go up to 10A. Anyone know why my switching regulator or DMM wont work with my gumstix? -- View this message in context: http://old.nabble.com/Battery-power-issues-tp30797509p30797509.html Sent from the Gumstix mailing list archive at Nabble.com. |
From: William P. S. I. <bil...@xp...> - 2011-01-30 01:29:40
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All that I can suggest is that switching regulators in general and $10.00 ones in particular don't handle transient loads well. Linear regulators on the other hand do. In the past I've done a design which used a switching regulator to reduce the input voltage from 24 volts, to say about 9 volts, followed by a linear regulator to drop it to 5 volts. You get some of the efficiency of the switcher with the transient response of the linear. As far as switchers go you can try a Powertrends 78ST205HC from digikey. It should have a faster transient response. It has the same pin out as a 7805. You need a 100uF output capacitor. As for the DMM. I did the same measurement as you with no problems. It could be that things Are so marginal that the voltage drop across the DMM is affecting the Gumstix ... Good luck Bill -----Original Message----- From: carrotSnack [mailto:sci...@ho...] Sent: Saturday, January 29, 2011 7:21 PM To: gum...@li... Subject: [Gumstix-users] Battery power issues I'm trying to power my overo tide and summit from a 2S Lipo battery but I'm experiencing some problems. First I tried to use a http://www.pololu.com/catalog/product/2103 switching regulator rated up to 600mA and the gumstix would always reach "Starting kernel ... Uncompressing Linux... done, booting the kernel." then power off. When I replaced the switching regulator with a linear one and also a linear one from BEC it booted up into login no problem. I decided to see how amps it was using during boot on a wall outlet with an adapter to see maybe if it was going above 600mA but when I connect my DMM it stayed between 200-300mA as expected then peaked at ~280mA and the gumstix lost power at the same point it did when using the switching regulator on the battery. The only things I have attatched to my summit board is the power and usb console connection. The regulators are at 5v and my DMM can go up to 10A. Anyone know why my switching regulator or DMM wont work with my gumstix? -- View this message in context: http://old.nabble.com/Battery-power-issues-tp30797509p30797509.html Sent from the Gumstix mailing list archive at Nabble.com. ---------------------------------------------------------------------------- -- Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! Finally, a world-class log management solution at an even better price-free! Download using promo code Free_Logger_4_Dev2Dev. Offer expires February 28th, so secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsight-sfd2d _______________________________________________ gumstix-users mailing list gum...@li... https://lists.sourceforge.net/lists/listinfo/gumstix-users No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.872 / Virus Database: 271.1.1/3406 - Release Date: 01/29/11 14:34:00 |
From: Paul N. <pa...@id...> - 2011-01-30 23:18:04
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> I'm trying to power my overo tide and summit from a 2S Lipo battery but I'm > experiencing some problems. First I tried to use a > http://www.pololu.com/catalog/product/2103 switching regulator rated up to > 600mA and the gumstix would always reach > > "Starting kernel ... > > Uncompressing Linux... done, booting the kernel." > > then power off. When I replaced the switching regulator with a linear one > and also a linear one from BEC it booted up into login no problem. I decided > to see how amps it was using during boot on a wall outlet with an adapter to > see maybe if it was going above 600mA but when I connect my DMM it stayed > between 200-300mA as expected then peaked at ~280mA and the gumstix lost > power at the same point it did when using the switching regulator on the > battery. > The only things I have attatched to my summit board is the power and usb > console connection. The regulators are at 5v and my DMM can go up to 10A. > Anyone know why my switching regulator or DMM wont work with my gumstix? Don't know about the DMM, but I use these regulators: http://www.pololu.com/catalog/product/2110 This one would also work if you put the batteries in parallel. I tested with 3 eneloops and it booted: http://www.pololu.com/catalog/product/799 Note that the voltage regulator on the COM is design to work directly with 1S LiPo/LiIon batteries, and will boot if you connect the battery to the 3.3V pin on the expansion board, but some components on the expansion boards are connected directly to V_BAT, so things like the voltage on the USB host port may drop below spec. I don't use DVI or audio and have no doubt fried those ports by now. Thanks, -- Paul Nolan, CEO Idruna Software Inc. |
From: carrotSnack <sci...@ho...> - 2011-01-31 03:14:10
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Idruna wrote: > > Don't know about the DMM, but I use these regulators: > http://www.pololu.com/catalog/product/2110 > > This one would also work if you put the batteries in parallel. I tested > with 3 eneloops and it booted: > http://www.pololu.com/catalog/product/799 > Do they both boot all the way into login? That step-down one has a higher switching frequency than mine so perhaps it handles transient loads better. I want to stay at 5v because I will have a 3g device connected to a usb port. That boost regulator looks interesting, using a 1S LiPo I could get ~10% less efficiency than the step-down one but just go for a mAh one possibly saving weight. Maybe I'll get that boost one and a better switching step-down, then get a 2S and 1S LiPo of the same weight and see which setup gives me the longest battery life. Also my DMM was a really cheap one since at the time all I wanted to use it for was getting a rough voltage reading, that's likely why my gumstix doesn't like it. -- View this message in context: http://old.nabble.com/Battery-power-issues-tp30797509p30803622.html Sent from the Gumstix mailing list archive at Nabble.com. |
From: Garry A. <boo...@op...> - 2011-01-31 03:59:52
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your problem is probably lead inductance rather than the step response of the regulator. Use short thick cables to feed the board. You can also add a moderate size capacitor (finger in the air 100uF 10V DC tantalum) at the input to the board to improve this. The DMM is the wrong tool to measure the voltage. USe a CRO across the input to the board. If the power droops more than 5% add more capacitance On 31/01/2011, at 2:14 PM, carrotSnack wrote: > > > Idruna wrote: >> >> Don't know about the DMM, but I use these regulators: >> http://www.pololu.com/catalog/product/2110 >> >> This one would also work if you put the batteries in parallel. I tested >> with 3 eneloops and it booted: >> http://www.pololu.com/catalog/product/799 >> > Do they both boot all the way into login? > That step-down one has a higher switching frequency than mine so perhaps it > handles transient loads better. > I want to stay at 5v because I will have a 3g device connected to a usb > port. > That boost regulator looks interesting, using a 1S LiPo I could get ~10% > less efficiency than the step-down one but just go for a mAh one possibly > saving weight. Maybe I'll get that boost one and a better switching > step-down, then get a 2S and 1S LiPo of the same weight and see which setup > gives me the longest battery life. > > Also my DMM was a really cheap one since at the time all I wanted to use it > for was getting a rough voltage reading, that's likely why my gumstix > doesn't like it. > -- > View this message in context: http://old.nabble.com/Battery-power-issues-tp30797509p30803622.html > Sent from the Gumstix mailing list archive at Nabble.com. > > > ------------------------------------------------------------------------------ > Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! > Finally, a world-class log management solution at an even better price-free! > Download using promo code Free_Logger_4_Dev2Dev. Offer expires > February 28th, so secure your free ArcSight Logger TODAY! > http://p.sf.net/sfu/arcsight-sfd2d > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: Paul N. <pa...@id...> - 2011-01-31 07:51:09
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> Do they both boot all the way into login? Yup, I use the first one with a Pinto, a USB hub powered in parallel, and a high power device or two plugged in. > That step-down one has a higher switching frequency than mine so perhaps it > handles transient loads better. It is rated for a lot higher load too. > I want to stay at 5v because I will have a 3g device connected to a usb > port. Which one do you have working? I only have the MC760 EVDO modem working so far, I need to get get some HSPA+ and LTE cards working. > That boost regulator looks interesting, using a 1S LiPo I could get ~10% > less efficiency than the step-down one but just go for a mAh one possibly > saving weight. Maybe I'll get that boost one and a better switching > step-down, then get a 2S and 1S LiPo of the same weight and see which setup > gives me the longest battery life. That would be interesting to see the results. With my high drain setup, I get about 4:20 with a 1500mAh 7.4V Li-ion. I can't remember what I had plugged in when I measured the 900mAh 14500 battery, but it ran about 90 minutes. 6 Eneloops with nothing plugged in to the hub ran for more than 10 hours, with a high power USB device, about 5. Am currently working on a design that runs from 4 18650s for an estimated run time of 12-18 hours, just trying to find someone to design a waterproof battery door. > Also my DMM was a really cheap one since at the time all I wanted to use it > for was getting a rough voltage reading, that's likely why my gumstix > doesn't like it. That's too bad, I was thinking of getting a cheap one to make measuring overall power draw easier. Thanks, -- Paul Nolan, CEO Idruna Software Inc. |
From: Paul N. <pa...@id...> - 2011-01-31 07:58:41
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> That's too bad, I was thinking of getting a cheap one to make measuring > overall power draw easier. Sorry, I meant a cheap bench power supply: http://cgi.ebay.com/Mastech-HY1502D-Regulated-Digital-DC-Power-Supply-/310291850324?pt=LH_DefaultDomain_0&hash=item483ed5e454#ht_1119wt_1139 Paul Nolan, CEO Idruna Software Inc. |