Comment by ptsd_isv
13 hours ago
You can negotiate charging with essentially a single resistor. Deciding when to stop / balancing cells etc is the harder problem.
13 hours ago
You can negotiate charging with essentially a single resistor. Deciding when to stop / balancing cells etc is the harder problem.
> You can negotiate charging with essentially a single resistor.
For USB sure.... I'm pretty sure this doesn't charge over USB.
I'm surprised, and you'll be surprised, but this is true!! I gotta start actually looking shit up before saying something....
https://en.wikipedia.org/wiki/SAE_J1772#Signaling
J1772 is significantly more than a single resistor. And, while the signaling is analog, all practical implementations are going to use digital circuitry to generate and detect it.
Well, OP Amps are technically "analog" too.
Op-amps are absolutely, 100% analog in every sense; there's no need to limit this assertion with the nonstandard adverb "technically". The term "analog" was invented in the first place specifically to describe circuits made out of op-amps rather than "digital" circuits. And, yes, you can totally balance the charge on your cells using op-amps and similar analog circuits. You will probably want some sharp PWM waveforms in the circuit, but PWM isn't all the way to digital.
Well, they could be using vacuum tubes…