Develop ultra capacitor power supply and LiFePO4 battery power supply

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jrling

Member
Joined 2010
Your measurements are of unknown make or quality of LiPO cells, with no mention of age, cycles of charge/discharge or temperature at place of test. All of which factors affect ESR of cells. Comparing that to the A123 26650 cells being used by Ian is definitely comparing 'apples with pears'.

A123 cells use their own patented technology and IMHO are the best quality LiFePO4 cells available. The manufacturer's data sheet here -
https://www.batteryspace.com/prod-specs/6610.pdf
states Internal ESR of 6 mOhms at 1kHZ. The usual current discharge for ESR readings seems to be 10 amps.

Whilst of course the manufacturer will pick the perfect test conditions to publish the result, I think with a company of the size and reputation of A123, we can accept that their result is genuine.

I have used those cells in my audio set-up for some years, with excellent results and nil failure rate.
 
dvb projekt

dvb projekt

Member
Joined 2009
Paid Member
iancanada said:
Fully assembled LifePO4Pure V2.0 PCB except the batteries. I was very busy this weekend. Will do a functional test is a day or two.


LifePO4PureV2.0_1 by Ian, on Flickr

Ian
Click to expand...

Hi Ian,

after i had discontinued my complete Red Baron DAC Projekt, i made my dreams come true and purchased a Chord Dave, i was not often here to see whats going on.

After i tried the fantastic roon SW, i swapped my complete library to a new roon NUC server with the RPi based allo DIGIONE Signature endpoint.

Remembering the outstanding LiFePo4 from 123 Systems with your FiFo in my Red Baron DAC, i powered the "clean side" of the DIGIONE again with these Batteries, with charger ect.

Now i stumbled over your new PSU and saw, that you are also switched to a RPi based DAC HAT...:) ...Cool...

Your PSU looks great and for me, because i am looking to a smarter version for my needs. Perhaps a bit too much lines, but hey...who knows what is in the future.

Is it possible to switch the Battery lines to one line to get more capacity? If so this were brilliant, because i need only one Battery line with 6.6V and the LDO line for the RPi with 5V.

Best regards,
Oliver
 
O

ofswitched

Banned
Joined 2018
jrling said:
Your measurements are of unknown make or quality of LiPO cells, with no mention of age, cycles of charge/discharge or temperature at place of test. All of which factors affect ESR of cells. Comparing that to the A123 26650 cells being used by Ian is definitely comparing 'apples with pears'.

A123 cells use their own patented technology and IMHO are the best quality LiFePO4 cells available. The manufacturer's data sheet here -
https://www.batteryspace.com/prod-specs/6610.pdf
states Internal ESR of 6 mOhms at 1kHZ. The usual current discharge for ESR readings seems to be 10 amps.

Whilst of course the manufacturer will pick the perfect test conditions to publish the result, I think with a company of the size and reputation of A123, we can accept that their result is genuine.

I have used those cells in my audio set-up for some years, with excellent results and nil failure rate.
Click to expand...

The batteries are all made in China, and they are all produced by machines. How much difference can the quality be? Just stick different brands and sell different prices. Battery shipping costs are particularly expensive, and when sold around the world, the price will include expensive shipping costs. A123's battery is more expensive, but I am afraid it is because of the expensive shipping cost.

If you don't care about the money, you can buy A123 directly, but I don't think you can buy it very well, so the difference will not be so great.

Intel also has a lot of patents and uses the most advanced process technology to mass-produce CPUs, but even so, he still makes some poor ones, so he puts low-frequency labels and sells them cheaper, and good ones puts high-frequency labels and sells more expensive. Sometime the low-cost CPU demand is relatively large, Intel will sell good quality chips at low prices, so you are lucky to buy such the CPU, and you can do overclocking. The same principle applies to the battery market.
 
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O

ofswitched

Banned
Joined 2018
jrling said:
Your measurements are of unknown make or quality of LiPO cells, with no mention of age, cycles of charge/discharge or temperature at place of test. All of which factors affect ESR of cells. Comparing that to the A123 26650 cells being used by Ian is definitely comparing 'apples with pears'.

A123 cells use their own patented technology and IMHO are the best quality LiFePO4 cells available. The manufacturer's data sheet here -
https://www.batteryspace.com/prod-specs/6610.pdf
states Internal ESR of 6 mOhms at 1kHZ. The usual current discharge for ESR readings seems to be 10 amps.

Whilst of course the manufacturer will pick the perfect test conditions to publish the result, I think with a company of the size and reputation of A123, we can accept that their result is genuine.

I have used those cells in my audio set-up for some years, with excellent results and nil failure rate.
Click to expand...

I only believe that LiFePO4 installed on Tesla is the best, but you can't buy it because Tesla has been screened. I don't believe A123 will be the best.

The same is the R-2R DAC, and it is not difficult to make, but MSB technology must invest a staggering cost to pick the resistor, so that MSB DAC has excellent sound, but the price is also very amazing.

I am more willing to use a simple measurement to initially screen the battery, then actually install it and listen with my ear to see if I can get lucky.
 
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O

ofswitched

Banned
Joined 2018
dvb projekt said:
Hi Ian,

after i had discontinued my complete Red Baron DAC Projekt, i made my dreams come true and purchased a Chord Dave, i was not often here to see whats going on.

After i tried the fantastic roon SW, i swapped my complete library to a new roon NUC server with the RPi based allo DIGIONE Signature endpoint.

Remembering the outstanding LiFePo4 from 123 Systems with your FiFo in my Red Baron DAC, i powered the "clean side" of the DIGIONE again with these Batteries, with charger ect.

Now i stumbled over your new PSU and saw, that you are also switched to a RPi based DAC HAT...:) ...Cool...

Your PSU looks great and for me, because i am looking to a smarter version for my needs. Perhaps a bit too much lines, but hey...who knows what is in the future.

Is it possible to switch the Battery lines to one line to get more capacity? If so this were brilliant, because i need only one Battery line with 6.6V and the LDO line for the RPi with 5V.

Best regards,
Oliver
Click to expand...

DIGIONE's clock can't be replaced by itself, which is a big drawback, because the key to reclocker is the quality of the clock. It is highly recommended that you buy Ian's FIFO so you can replace a good clock yourself. Unfortunately, Pulsar Clock has been discontinued again and it is very likely that production will never be resumed.

The power quality requirements of RPi3 or DIGIONE are not high. Even if LiFePo4 is used, the improvement of sound should be limited. In your system, Chord DAVE should only be power by LiFePo4 or Ultra capacitor. It is recommended that you try to skip the internal AC-DC and provide DC power directly. Internal DC power supply of DAVE, one terminal can be replaced

If you need more capacitors, you can connect more batteries in parallel at a specific battery location, and the remaining battery locations are empty.

Ian LiFePO4 Power supply principle block diagram

Voltage rails:

1, Low noise linear regulated 5V 2A: for digital sections (before isolator is suggested);

2, Pure LifePO4 battery power 3.3V: for clock board;

3, Pure LifePO4 battery power 3.3V: for DAC;

4, Pure LifePO4 battery power 3.3V or 6.6V or 9.9V or 13.2V: for I/V stages or analog sections;

5, Pure LifePO4 battery power 3.3V or 6.6V or 9.9V or 13.2V: for I/V stages or analog sections;

Develop ultra capacitor power supply and LiFePO4 battery power supply
 
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O

ofswitched

Banned
Joined 2018
dvb projekt said:
Hi Ian,

after i had discontinued my complete Red Baron DAC Projekt, i made my dreams come true and purchased a Chord Dave, i was not often here to see whats going on.

After i tried the fantastic roon SW, i swapped my complete library to a new roon NUC server with the RPi based allo DIGIONE Signature endpoint.

Remembering the outstanding LiFePo4 from 123 Systems with your FiFo in my Red Baron DAC, i powered the "clean side" of the DIGIONE again with these Batteries, with charger ect.

Now i stumbled over your new PSU and saw, that you are also switched to a RPi based DAC HAT...:) ...Cool...

Your PSU looks great and for me, because i am looking to a smarter version for my needs. Perhaps a bit too much lines, but hey...who knows what is in the future.

Is it possible to switch the Battery lines to one line to get more capacity? If so this were brilliant, because i need only one Battery line with 6.6V and the LDO line for the RPi with 5V.

Best regards,
Oliver
Click to expand...



You can also buy the charging board and the relay module with a remote control to DIY LiFePo4 power supply yourself. On my own LiFePo4, I only installed the voltage detector and activated the charging when the battery is too low without the automatic charging design.

Although I can also increase the voltage detector, and switch to charging when the voltage is lower than the threshold, but I feel that the design of automatic charging has a higher risk, I still believe in my brain to choose timing to charge using the voltage detector.

Among the multiple rails, only 3.3V for DAC will be the most power-hungry, so only need to detect for 3.3V for DAC, the rest of the rails are charged simultaneously with 3.3V for DAC.

My own LiFePo4 power supply is almost finished. I just wait for the super capacitor to do spot welding the battery electrode.
 
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iancanada

iancanada

Member
Joined 2009
twitter.com/iancanadaTT
Paid Member
dvb projekt said:
Hi Ian,

after i had discontinued my complete Red Baron DAC Projekt, i made my dreams come true and purchased a Chord Dave, i was not often here to see whats going on.

After i tried the fantastic roon SW, i swapped my complete library to a new roon NUC server with the RPi based allo DIGIONE Signature endpoint.

Remembering the outstanding LiFePo4 from 123 Systems with your FiFo in my Red Baron DAC, i powered the "clean side" of the DIGIONE again with these Batteries, with charger ect.

Now i stumbled over your new PSU and saw, that you are also switched to a RPi based DAC HAT...:) ...Cool...

Your PSU looks great and for me, because i am looking to a smarter version for my needs. Perhaps a bit too much lines, but hey...who knows what is in the future.

Is it possible to switch the Battery lines to one line to get more capacity? If so this were brilliant, because i need only one Battery line with 6.6V and the LDO line for the RPi with 5V.

Best regards,
Oliver
Click to expand...


Thanks Oliver,

Yes, it's possible. Because all rails are isolated from each other, you can parallel rails that have same output voltage together to get higher performance.


Regards,
Ian
 
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