Okey Guys,
apologies for being away all this while.
I'm in travel with limited connectivity, so please bear with me.
Lots of discussions going around, trying to sum them up w.r.t the design the way I understand them:).
Few changes incorporated:
1) Transistor...
Thanks @Hedges . That's the reason I opted for a 12V "Safe" portable system. No direct interference with line AC as well.
I believe we are playing with a very basic and safe system - which @ max could smoke black with a "Pop" sound from some cap - nothing more.
I don't know, I'm not fan of...
Not So much, just the component costs have exceeded that of a decent BMS.
May be Yes.
How do you suggest to go about it? Enroll @ University?
If not - what did you make out of things we are trying to do here?
No, I don't intend to write my thesis around physics behind functional principals of...
Here's the Spec sheet:
That R7 with 47K was there just to supply replenish/leakage current of ~1mA(45-12V) to Capacitor C1-> Mosfets.
My understanding is that Zeners work on Voltages and not on current.
Once the substrate collapses with zener voltage put across, impurities should release all...
Ahh, got caught up with a few things;).
:ROFLMAO: Absolutely, there's surely some "rush-up" work that I despise. Thanks for the fine eye!
P1 is the same connection originating from first positive electrode on the battery going all the way to Balance Mosfet M4.
Since resource is the same -...
It's delight to hear engineering stories and revelations behind pursuits of precision.
Although its pretty obvious but never realized what it takes to put accuracy and precision into electronic components.
A Big thumbs up (y) just for the passion.
By the way I rearranged schematic as per...
Yes Cal, its intentional to activate balancing only during charge cycle.
We can let it be there across all phases and hence the small balance current.
True, trying to rearrange things so we just have to deal with one ground for internal circuitry while the other ground comes into picture only...
PV negative is not connected directly to microcontroller but it latchges to SCC ground when mosfets are activated. SCC is internally hardwired with Battery ground - which is common ground for the microcontroller also.
I am not sure if we can read less than '0' volts at microcontroller inputs...
Update
Thanks @BiduleOhm for the critical review.
Corrected Mosfet charging mechanism by using optocouplers as drivers which shall utilize charge from PV source for the purpose.
Since now multiple drivers are to fed - beefed up current from Zeeners as well.
For the Voltage divider network...
Checked some of your videos. You are good at your work Brandon!
What line of work do you originally belong? Would be interested to see how this Power Bank takes up the shape.
TC
Hi,
here's the draft schematic for 4S Cell balance module.
Idea is to monitor voltage of each individual cell ( via voltage divider) and short local electrodes once voltage reaches pre-determined top charge.
While exact algorithm for balancing can be done in microprocessor, dissipating...
Thanks @Hedges for all those suggestions. They are kind of on the list and more.
Got LM335s for temp and Hall effect sensor for current monitoring.
This board and automation control is a very late afterthought, had installed analog battery and power monitors already.
Still its fun to have the...
Vds and Vds are originating from the same source - shouldn't they be at the same potential/ common reference?
And once Gate saturates from Vgs and start to conduct, complete system would be at battery ground reference anyways.:rolleyes: