Hi folks. A quick question I’m struggling to get my head around. I normally use my 18650s for modded bike lights but this is for another project.
So…as part of a portable radio I’m making, I’m building a little charging circuit.
So we start with 19VDC (4 amp) into my radio from a laptop charger.
My cells are Panasonic protected 3400mah. I’m using the charging board above to balance the cells.
So my question is: How much current will the charging 4S2P pack draw? My little buck regulator is only rated for 2-3amp. (I think 3amp needs a heatsink).
Do commercial chargers have some means of regulating the current available to the cells? I don’t want to burn out my regulator or allow the cells to charge too fast.
Both links do not work
If I understand what you are trying to do, why not choose a buck driver that can also regulate your input current to say, 1A
I like the idea
Without seeing the specs you may not even have to buck the charging voltage down to 16.8
I think it might actually have to be a little higher to allow for some headroom for the BMS circuit to operate. Depends on how the BMS board operates.
What you are planning on doing can be dangerous. Be very careful. Even if you know what you are doing, it can still be dangerous
It’s a constant current and constant voltage module. I think this should make things safe. I’m actually building my radio inside a steel ammo box so if things go boom I should be OK
I think I’ll stick to 1.5 amp charge current to keep things cool.
Well, obviously you need a CC-CV supply for that purpose. In fact, lots of flashlight led drivers are sorts of custom CC-CV supplies.
There are modules which, besides Constant Current and Constant Voltage output adjustments, allow you to dial a “termination current” and then display some sort of indication (leds, displays, etc) to inform you of the device's status.
