Are you trying to re-invent a balanced charger by charging each cell in a sequence?
Yes and No, just looking at the subject out of interest!
Your idea will take 17 times longer than a normal balanced charger that charges all the cells at the same time.
Relays were used in low current circuits 60 years ago.
Not my idea, but the statement is incorrect. The Balancer and Charger are working separately.
The idea of using relays is in fact another persons idea.
The relays are a schematic representation just like the resistors.
Most anything that can be demonstrated with relay, can be replaced by solid state.
A modern balanced charger detects that a cell's voltage is higher than the others then it bypasses some of the charging current past that cell with a transistor or Mosfet.
Yes, all I am interested in is the logic used.
I have a few commercial options for suitable balance circuitry, the plan is to buy a commercial "Active Non-dissipative balance" system.
I am here to discuss a concept, that I do not believe will work.
My contribution was to suggest using a Voltage divider across bank, bank voltage divided by Cell Number.
The logic is it would nudge cells towards balance, whilst the main charging is provided across the series string.
The original idea proclaimed to use a capacitor, that was shared between cells to either source or sink depending on level.
I think this is rubbish, the sharing would most likely result in net loss. The poster wanted others to guess how it worked before giving any explanation. Ha.
I am looking at the general mythology in Charging Lifepo4 cells because I am very interested.
Most of my research has been in the characteristics of cells and Partial State of Charge.
After about 6months research I understand the cells, and charge requirements very well.
The reason why it takes so long, is there is no one answer, it starts with the application.
Are you interested in discussing the logic side of the concept?
If the basic concept as is, can be demonstrated!
Then I have a lot more to discuss about the logic or intelligent design that might be applied.
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Not strictly a voltage follower. It's a voltage-controlled voltage source, because it has gain.
Yes, so we remove the resistors. Use two transistors? Are you making a clarifying point or do you have circuit suggestion?
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So stop charging when the voltage reaches 3.6V or 61.2V total.
Here is a video on battery balancing. This is close to what I have talked about before. Have a separate battery charger/battery.
https://www.linear.com/solutions/1128
Thanks ronsimpson, I have the option of pre-built PCB.
I am not interested in Hardware fixed charge voltages, it has not got relevance in PSOC applications, other then, perhaps the cells operating limitations!
I also contacted a Chinese PCB Manufacturer by mistake, the company asked if I have a picture or IC they could make it.
This is a little odd, but they claim to provide many BMS to suppliers and open to ideas.
In any case, I will study the LTC3300 data sheets,
Cheers