From: Jeff T. <je...@jt...> - 2008-02-06 22:49:39
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I am currently running these two boards plus a console-vx off a standard 5Vdc gumstix plug wart. We are about to move to battery power so I'm working on the charging and regulation circuits required. We have other '5 volt' stuff to run off the battery pack that really doesn't like to go much below 5 volts so we're looking at using a 4 cell NiMH pack (really 4x2 in parallel) instead of the normal 3 cell pack the the Wiki recommends. The netwifimicroSD page says it supports 3.6 to 6 volts, no issues there, but what about the Verdex and the console, can they handle an overvoltage? A 4 cell NiMH pack can run up to 5.6 volts freshly charged. To properly charge a 4 cell pack you need 1.41 volts x 4 for almost 6.65 volts across the stack. Since we normally charge 'in place' and float charge at 10C this is an issue. Can the three boards in question tolerate this on a continuous basis or will I need a regulator between the batteries and the gumstix? Thanks in advance and I will publish power consumption data once I develop some, we seem to be very sparse in that area, esp. for the wifi & network stuff. JT -- =================================================================== |Jeffrey S. Tyler CISSP Journeyman Sysadmin | |je...@jt... [Home phone/fax] 520-366-0415/0468| |jeffrey.tyler@SignalSolutionsInc.com [Office] 520-533-3293 | | -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=| |"A government that is big enough to give everything that you need| | and want is also big enough to take it all away," | | - Barry Goldwater. | =================================================================== |
From: Jay P. <jay...@tr...> - 2008-02-07 15:06:25
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Personally, I wouldn't run the boards directly off a battery. I'm putting a voltage regulator on my setup. ----------------------------------------------------- Jay Phillips Tronix LLC - http://tronixllc.com -----Original Message----- From: gum...@li... [mailto:gum...@li...] On Behalf Of Jeff Tyler Sent: Wednesday, February 06, 2008 2:49 PM To: stix Subject: [Gumstix-users] Max voltage for Verdex + NetwifimicroSD ? I am currently running these two boards plus a console-vx off a standard 5Vdc gumstix plug wart. We are about to move to battery power so I'm working on the charging and regulation circuits required. We have other '5 volt' stuff to run off the battery pack that really doesn't like to go much below 5 volts so we're looking at using a 4 cell NiMH pack (really 4x2 in parallel) instead of the normal 3 cell pack the the Wiki recommends. The netwifimicroSD page says it supports 3.6 to 6 volts, no issues there, but what about the Verdex and the console, can they handle an overvoltage? A 4 cell NiMH pack can run up to 5.6 volts freshly charged. To properly charge a 4 cell pack you need 1.41 volts x 4 for almost 6.65 volts across the stack. Since we normally charge 'in place' and float charge at 10C this is an issue. Can the three boards in question tolerate this on a continuous basis or will I need a regulator between the batteries and the gumstix? Thanks in advance and I will publish power consumption data once I develop some, we seem to be very sparse in that area, esp. for the wifi & network stuff. JT -- =================================================================== |Jeffrey S. Tyler CISSP Journeyman Sysadmin | |je...@jt... [Home phone/fax] 520-366-0415/0468| |jeffrey.tyler@SignalSolutionsInc.com [Office] 520-533-3293 | | -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=| |"A government that is big enough to give everything that you need| | and want is also big enough to take it all away," | | - Barry Goldwater. | =================================================================== ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ gumstix-users mailing list gum...@li... https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: Marcus W. <Marcus@Wolschon.biz> - 2008-02-07 15:09:10
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How big does the regulator have to be? 2008/2/7, Jay Phillips <jay...@tr...>: > Personally, I wouldn't run the boards directly off a battery. I'm putting a > voltage regulator on my setup. |
From: Jay P. <jay...@tr...> - 2008-02-07 15:13:28
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Depends on your load. I'm using a 1A output module from Dimension Engineering (they get another plug :) ) I think that will be enough for my verdex / robostix / netwifimicro-SD stack. ----------------------------------------------------- Jay Phillips Tronix LLC - http://tronixllc.com -----Original Message----- From: gum...@li... [mailto:gum...@li...] On Behalf Of Marcus Wolschon Sent: Thursday, February 07, 2008 7:09 AM To: General mailing list for gumstix users. Subject: Re: [Gumstix-users] Max voltage for Verdex + NetwifimicroSD ? How big does the regulator have to be? 2008/2/7, Jay Phillips <jay...@tr...>: > Personally, I wouldn't run the boards directly off a battery. I'm putting a > voltage regulator on my setup. ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ gumstix-users mailing list gum...@li... https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: Jay P. <jay...@tr...> - 2008-02-07 15:18:48
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It's early. I just realized what you said about your batteries. Your input voltage usually needs to be at least 1.5v about your output voltage for a regulator to work. So a nominal 6v battery supply cannot be assumed to supply enough voltage to provide a 5v output. So I'm not sure what you could do, short of using a higher voltage battery setup. Maybe use a diode drop to protect the gumstix from voltages higher than 6v? ----------------------------------------------------- Jay Phillips Tronix LLC - http://tronixllc.com -----Original Message----- From: gum...@li... [mailto:gum...@li...] On Behalf Of Marcus Wolschon Sent: Thursday, February 07, 2008 7:09 AM To: General mailing list for gumstix users. Subject: Re: [Gumstix-users] Max voltage for Verdex + NetwifimicroSD ? How big does the regulator have to be? 2008/2/7, Jay Phillips <jay...@tr...>: > Personally, I wouldn't run the boards directly off a battery. I'm putting a > voltage regulator on my setup. ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ gumstix-users mailing list gum...@li... https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: Steve S. <sa...@gm...> - 2008-02-07 15:43:10
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> Your input voltage usually needs to be at least 1.5v about your output You could use a low drop out (LDO) regulator which could cut that differential to below 0.5V Steve On Feb 7, 2008 7:18 AM, Jay Phillips <jay...@tr...> wrote: > It's early. I just realized what you said about your batteries. > > Your input voltage usually needs to be at least 1.5v about your output > voltage for a regulator to work. So a nominal 6v battery supply cannot be > assumed to supply enough voltage to provide a 5v output. > > So I'm not sure what you could do, short of using a higher voltage battery > setup. Maybe use a diode drop to protect the gumstix from voltages higher > than 6v? > > ----------------------------------------------------- > Jay Phillips > Tronix LLC - http://tronixllc.com > > > -----Original Message----- > From: gum...@li... > [mailto:gum...@li...] On Behalf Of Marcus > Wolschon > Sent: Thursday, February 07, 2008 7:09 AM > To: General mailing list for gumstix users. > > Subject: Re: [Gumstix-users] Max voltage for Verdex + NetwifimicroSD ? > > How big does the regulator have to be? > > 2008/2/7, Jay Phillips <jay...@tr...>: > > Personally, I wouldn't run the boards directly off a battery. I'm putting > a > > voltage regulator on my setup. > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2008. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2008. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |
From: Marcus W. <Marcus@Wolschon.biz> - 2008-02-07 16:19:47
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Actually there are some buck&boost-regulators, also called battery-life-expanders. They allown you to work with input-.voltages down to about half the output-voltage. As far as I understand it they use an inverter to double the input-voltage or something like that. In the end it means that you can draw power much longer from batteries that do not drop rapidly in their voltage when becomming empty. I do not think this happens with Lithium-Polymer but for NiMh this definately is worth a thought. Marcus 2008/2/7, Steve Sakoman <sa...@gm...>: > > Your input voltage usually needs to be at least 1.5v about your output > > You could use a low drop out (LDO) regulator which could cut that > differential to below 0.5V -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFHqy+mf1hPnk3Z0cQRAgb2AKDAXO++aEsbWcZgGSqeYFfETxfWrwCgoj4Y 7b3/UiHUe+wCHQVyEenXFDA= =3Bl/ -----END PGP SIGNATURE----- |