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Old 27th January 2017, 09:03 PM   #1
jborden is offline jborden  United States
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Default Dual Bank Floating Supercap Supply

This is a design for a dual bank floating supercap power supply. TL431 are used as voltage sensors, 2 for each bank, along with logic to keep the A and B supercap banks between a max and min voltage. The bank connected to the output is isolated from the supply charger by the relay, and thus will have leakage current determined by the relay -- zero for electromechanical and generally less than one uA for SSR.

The supercaps are placed in series. This circuit employs the ALD8100XX supercap balancing quad mosfet chip, so one chip for each 10v or so of supply assuming 2.7v supercaps. The modules can be placed in series to generate 10,20,30V supplies as needed.

The output will vary between the min and max voltages, a follow-on regulator can make a precise supply voltage.

The output voltage is truly floating.

Supercap PSU.jpg
v-sensor.png
supercap-module.png
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Old 30th January 2017, 12:37 AM   #2
jborden is offline jborden  United States
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The logic can be used with two battery packs as well, with automatic switching between discharge and recharge cycles between two packs.

This circuit individually charges each cell, and then connects all cells in series when in the discharge phase:

<JAB.R> Battery Pack.jpg
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Old 30th January 2017, 02:26 PM   #3
Crom is offline Crom  United Kingdom
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Interesting!
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Old 5th February 2017, 04:02 PM   #4
jborden is offline jborden  United States
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This board uses the NXP PSMN075-100MSE MOSFET to implement the relays -- datasheet indicates 10nA leakage current typical. I've used the TL431 and an NPN to make the +5V logic supply. On the left are the 4 TL431 based voltage sensors. Lower middle are the 4 logic chips. Above these to the right are the MOSFETs, and above to the left the series regulator.

<JAB.R> Dual Bank board.png
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Old 19th March 2017, 09:45 PM   #5
palmito is offline palmito  United States
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Default Very Interesting!

Are you using the design?

Are you going to sell pcbs or make gerbers available?

Thanks
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Old 19th March 2017, 11:16 PM   #6
jborden is offline jborden  United States
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Quote:
Originally Posted by palmito View Post
Are you using the design?

Are you going to sell pcbs or make gerbers available?

Thanks
I'm not using it yet but plan to. Still working out some details of the supercap board vs battery boards (what is posted will work with these other modules). If there is enough interest we can make a run of PCBs once its tested.
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Old 4th June 2017, 11:35 PM   #7
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jborden,

Did you see the supplies being used in this thread:

https://www.head-fi.org/f/threads/r2....839007/page-6

Sounds like a great application for your boards.

Anymore progress?

Very interested!

Greg in Mississippi
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Old 5th June 2017, 07:09 PM   #8
jborden is offline jborden  United States
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Hi Greg,

I have a board design but haven't had the time to test it -- nor have I ordered it myself yet. I am using batteries in my prototypes for the time-being and so my own implementation is pushed back.

Jonathan
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Old 7th June 2017, 01:34 PM   #9
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Jonathan,

I am sure you can find some willing alpha testers BESIDES me given the current interest in this type of power supply configuration AND the difficulties associated with implementing it in other manners.

My hand's up!

Greg in Mississippi
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