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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 10th January 2019, 03:45 PM   #421
merlin el mago is offline merlin el mago
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That's the commercial product substitute?

UltraCap™ LPS-1 – UpTone Audio
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Old 10th January 2019, 03:52 PM   #422
wealas is offline wealas
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Not really, the Uptone has only one output but the worst part are the LDOs after the capacitors.

Last edited by wealas; 10th January 2019 at 04:16 PM.
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Old 10th January 2019, 03:54 PM   #423
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by wealas View Post
Not really, the Uptone has only one output but the worst part are the LDOs after the batteries.
Thank you.
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Old 12th January 2019, 04:35 PM   #424
Dave S is offline Dave S  United Kingdom
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Quote:
Originally Posted by sq225917 View Post
There's sprung terminals soldered through the board
Thanks Simon.
I have ordered cells with "U" tags. I guess I can cut them off (after I've run my output impedance tests).
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Old 13th January 2019, 10:13 PM   #425
Jorgen E is offline Jorgen E  Denmark
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Originally Posted by iancanada View Post
@dvb projekt

You can not use the two 3.3V rails for the 6.6V output. So, you can parallel the rest two 6.6V rails together. In this case, 4 cells will be needed.

That's exactly what I'm looking for too Have been following You or at time, and saw the projekt last Year.

If I only need the two 6,6V can I then leave the rest batteryholders empty ?

Is it with an integrated charger og is it bougt seperately ?

What's the price an how do I order ? Do You have an ongoing 2019 buy ?
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Old 13th January 2019, 10:51 PM   #426
iancanada is offline iancanada  Canada
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Develop ultra capacitor power supply and LiFePO4 battery power supply
Quote:
Originally Posted by Jorgen E View Post
That's exactly what I'm looking for too Have been following You or at time, and saw the projekt last Year.

If I only need the two 6,6V can I then leave the rest batteryholders empty ?

Is it with an integrated charger og is it bougt seperately ?

What's the price an how do I order ? Do You have an ongoing 2019 buy ?
Yes, you can leave the rest of battery footprints empty if you don't need them. But you may need a couple of jumper wires at bottom side of PCB. Programmable battery charger is integrated on the PCB but you will need a external DC power. Standard 18.5V 3.5A laptop adapter would be good to go.

Regards,
Ian
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Old Yesterday, 08:51 PM   #427
Dave S is offline Dave S  United Kingdom
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Further to my post #399. I tested 3 pcs of 26650 A123 LiFePO4 cells in series.
The cells were brand new then ~95% charged/balanced before the tests. Experience with LiIon cells shows the the performance of the cells can improve after a few cycles.

I measured the output impedance at 44mOhms for the 3 cells, so approx 15mOhm per cell. The transient response is also rather better than the LiIon cells.

Conclusion: Very impressive performance!
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Old Yesterday, 09:04 PM   #428
Crom is offline Crom  United Kingdom
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Quote:
Originally Posted by Dave S View Post
Further to my post #399. I tested 3 pcs of 26650 A123 LiFePO4 cells in series.
The cells were brand new then ~95% charged/balanced before the tests. Experience with LiIon cells shows the the performance of the cells can improve after a few cycles.

I measured the output impedance at 44mOhms for the 3 cells, so approx 15mOhm per cell. The transient response is also rather better than the LiIon cells.

Conclusion: Very impressive performance!

Interesting Dave S, thanks for posting your findings - our ears don't deceive us on this one! Do you have the traces to compare to your other testing...I'm just interested?
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Old Yesterday, 10:06 PM   #429
Jorgen E is offline Jorgen E  Denmark
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What type of soldering taps if any on the LifePo - U-type ?
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Old Yesterday, 10:25 PM   #430
Dave S is offline Dave S  United Kingdom
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Hi Crom,

Pic 1: 5mV/div 20uS/div
Pic 2: 10mV/div 2uS/div (close up of load-on waveform)
Pic 3: 5mV/div 2uS/div (close up of load-off waveform)

Battery voltage = 10.24V. Load resistor = 220R. Therefore the load switches between 0 and 45mA at 10KHz and deltaV = 2mV.
So ESR = 2/45 = 44.4mOhms (for 3 cells in series)

Click the image to open in full size.
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