Need help about this balancing circuit connections

Thread Starter

hamzaaaaay

Joined Jan 5, 2025
2
I'm working on designing an active capacitive cell balancer using IRFZ44N MOSFETs, the TC4422 Driver IC, and an STM32 microcontroller. The STM32 will read the voltage of each cell using its ADC and control the MOSFETs through GPIO pins.

The system is for a prototype battery made of 10 supercapacitors (400F, 2.7V), grouped into 5 cells, with each cell consisting of two supercapacitors connected in parallel. The goal is to balance the voltage across these cells.

I’ve put together a rough schematic and would love some feedback. I'll also be using current-limiting resistors to protect the system.
Need your insights about this.... I'm guessing this might not work and need many improvements.
View attachment 339617View attachment 339617
 

DickCappels

Joined Aug 21, 2008
10,661
When clicking on the link in your post I get the message:
"Error 404
The page you requested was not found"

Try pasting the drawing directly into your post.
 

MisterBill2

Joined Jan 23, 2018
27,180
I am guessing that the "battery" is a series stack of the capacitor pairs. I am also thinking that probably the STM32 does not have differential inputs to it's analog section. In addition, probably there will also be a problem with common mode voltage limits for any analog input scheme.
These concerns are based on my experience with multiplexed analog inputs in the past, so they certainly will require a close examination of the analog input section specifications of that STM32 system.
 
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