Weird power issue

[Tugdual]

(05-13-2019 11:02 AM)Zaphod Wrote:  

(05-12-2019 06:37 AM)jebem Wrote:  Fast chargers are able to supply in excess of 5 amperes depending on the smartphone device being able to consume that current.

True, but this has no bearing cos the device will draw as much current as it needs, up to the maximum deliverable by the power supply. AT that point the power supply will current limit or shut down (or even reduce) current output.

Quote:What those fast chargers do is to supply up to 20 Volt in riple mode to force more current into the device being charged. This is well above the standard 5 Volt expected by the Prime, i would say.

Begging your pardon, unless there's something being lost in translation?, but this is nonsense!. USB is USB, it follows standards.
USB3/USBC allows a different charging voltage which can be 20VDC, but that's USB3/C

Considering the very low impedance of batteries, 20V would be an absolute killer! I checked my La Crosse battery charger and found that the max 1A is delivered with 1.5V that is only 0.3V above nominal battery voltage.