Message from @Goz3rr
Discord ID: 609501480642150411
it looks like varying current is how its done
> Fast charging at high voltage?
section explains that it does step down the voltage to increase the current
you can't increase voltage, it's not safe
```The diagram above shows how MediaTek’s PumpExpress 3.0 and 4.0 manage to reach up to 5A of charging current. If a 5A cable is connected, its technology bypasses the conventional switching charger to enable a higher current. In this case, the circuit negotiates the required voltage over the data lines, raising and lowering the Vbus charging voltage for maximum efficiency.```
i could fucking write a report on this
you can't increase current, it's limited by the batteries internal resistance and safety
all of these sources show that phones that support quick charging have batteries that support higher currents aswell
yes, that's the power going into the phone, and it slightly increases charging current for the battery
it increases it quite a lot
in that one case up to 5A
that's what's going into the phone
pre losses
- what the phone is actually drawing
in order for quick charge to charge a battery faster more power has to enter the battery. power can only exist as voltage and current. we've established that batteries are charged at a very specific voltage and that the current the battery sees varies with respect to the battery voltage
batteries are not charged at a specific voltage
it depends how discharged they are
the more discharged a battery is, the more current it wants to draw and it's limited by lowering the voltage
as it gets charged the voltage climbs to ~4.2V and current drops
yessss
you're not
its technically correct if you only consider the power going into the *phone* since thats how the quick charge standard works
let me look at the links you posted
the first one has nothing to do with charging
that's a datasheet for a quickcharge controller
it only negotiates power with a quickcharge charger
you could hook it up to fan for all it cares
i did see a variable powersupply build based on it or something like it
but yeah thats what makes it technically correct
the battery seees something different but the phone sees voltages according the quickcharge standard or whatever its using
the phone's charging port sees *
if you take apart the phone and plug it in and poke the charging port pin with a multimeter and it has successfully negotiated a higher voltage from the charger then the meter should show a higher voltage across the d+ and d- pins
the d+ and d- pins are data pins
wait yeah i forgot
the standard raises the vbus pin
d+ and d- never go higher than 3.3v
Fuckin nerds
you can keep posting diagrams and shit about power delivery
but i'm not arguing with you on that