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Develop ultra capacitor power supply and LiFePO4 battery power supply
Develop ultra capacitor power supply and LiFePO4 battery power supply
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Old 19th February 2019, 11:59 PM   #461
ofswitched is offline ofswitched  Taiwan
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Quote:
Originally Posted by alazira View Post
Is there some reason all the tabs seem to be made of nickle?

Nickel has a relatively high melting point and is relatively resistant to high currents and high thermal energy at the moment of welding. If you spot-weld a copper piece with the same spot welding parameters, it is easy to generate a lot of sparks and burnt copper pieces...
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Old 20th February 2019, 12:58 AM   #462
iancanada is offline iancanada  Canada
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Develop ultra capacitor power supply and LiFePO4 battery power supply
Default LifePO4 26650 cells with tabs

Quote:
Originally Posted by Morde View Post
Is it really so that we need to spot weld the tabs? It's quite difficult to find batteries with the soldering tabs. Or maybe I haven't looked at the right places...
Quote:
Originally Posted by alazira View Post
Is there some reason all the tabs seem to be made of nickle?
Just found my old post of LifePO4 battery cells with tabs.

Develop ultra capacitor power supply and LiFePO4 battery power supply

a123 : A123 Systems APR18650M1A 1100mAh - A123 Systems AMP20M1HD-A, 2

Just hope it helps.

Regards,
Ian
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Old 20th February 2019, 01:25 AM   #463
MikeyFresh is offline MikeyFresh  United States
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Develop ultra capacitor power supply and LiFePO4 battery power supply
AA Portable Power Corp. in California dba BatterySpace.com offers these cells with tabs.
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Old 20th February 2019, 09:12 AM   #464
Morde is offline Morde  Finland
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Develop ultra capacitor power supply and LiFePO4 battery power supply
Quote:
Originally Posted by iancanada View Post
Just found my old post of LifePO4 battery cells with tabs.

Develop ultra capacitor power supply and LiFePO4 battery power supply

a123 : A123 Systems APR18650M1A 1100mAh - A123 Systems AMP20M1HD-A, 2

Just hope it helps.

Regards,
Ian
Thanks a lot Ian. I ordered me some batteries...
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Old 20th February 2019, 04:58 PM   #465
LinuxGeek is offline LinuxGeek
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Hi, I would like to use this LiFePo4 PSU, but i need one more 3.3V rail then available.
Is it possible to use one rail for the dac itself and the isolation ic ? I use the IL715E isolation chip and a 3.3V dac. Can i just connect them in parallel without big compromises in quality (of course only the clean side of the il715e). Or is a ferrite bead any good in this case ?
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Old 20th February 2019, 05:13 PM   #466
iancanada is offline iancanada  Canada
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Develop ultra capacitor power supply and LiFePO4 battery power supply
@LinuxGeek

Yes, it is possible. Because LifePO4 battery has very low internal impedance and without any feedback, you can share one 3.3V rail with DAC and isolator. Please just make sure both of them are connected to the LifePO4 output terminal directly.

Regards,
Ian
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Old 21st February 2019, 02:27 AM   #467
ofswitched is offline ofswitched  Taiwan
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Quote:
Originally Posted by MikeyFresh View Post
AA Portable Power Corp. in California dba BatterySpace.com offers these cells with tabs.
Search ebay with "LiFePO4 26650 Tabs", you can find more.
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Old 21st February 2019, 07:59 AM   #468
Morde is offline Morde  Finland
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Develop ultra capacitor power supply and LiFePO4 battery power supply
Hi Ian.
A question regarding the lifepo4 manual. It says on the page 9, chapter L, part 3.:
"(2). If any output voltage at J1 or J2 is lower than 3.3V, the power supply will turn off automatically to prevent
battery form over discharge.
"
Does it really shut down right below 3.3V? I thought that 3.3V is the nominal voltage for ANR26650M1B batteries and according to the battery manual you can discharge it all the way down to 2.0V. Is this 3.3V limit from the DAC and Fifopi electronics?
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Last edited by Morde; 21st February 2019 at 08:01 AM. Reason: a link was added
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Old 21st February 2019, 11:58 AM   #469
iancanada is offline iancanada  Canada
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Develop ultra capacitor power supply and LiFePO4 battery power supply
@Morde

Actually the threshold is 3V. The power supply will be shut down when the output voltage is lower than.

Thank you so much for finding a bug in the user's manual .

Regards,
Ian
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Old 22nd February 2019, 06:32 AM   #470
Ipoci is offline Ipoci  Italy
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Hello! This is my current DAC:
https://up.nexthardware.com/user_ima...oci_DSC252.jpg


I've the following separate power supply feeds:
+5V with Belleson regulator > DSC2.5.2 dac

+3.3V with Belleson regulator > DSC2.5.2 dac

+5V with Belleson regulator > DSC2.5.2 dac
+7V with LT3080 then +5V LT3083 > McFiFo
+7V with LT3080 then +5V LT3083 > DualXo
+7V with LT3080 then +5V LT3083 > BeagleBoneBlack
+5V with LT3080 > planned for DualXO Arduino display


Let assume to keep BeagleBone and Display powered by LPS, can I use a sigle UltraCapacitor board to feed the remaining 5 lines?



Is the board orderable?
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