US 9,812,878 B1
Dynamic current redistribution for portable electronic devices
Marcel Colman Eric Stieber, Sunnyvale, CA (US); Thomas Gang Wang, San Jose, CA (US); and Vidhyananth Ramasamy Venkatasamy, Sunnyvale, CA (US)
Assigned to Amazon Technologies, Inc., Seattle, WA (US)
Filed by Amazon Technologies, Inc., Seattle, WA (US)
Filed on Dec. 14, 2015, as Appl. No. 14/968,325.
Application 14/968,325 is a continuation in part of application No. 14/744,782, filed on Jun. 19, 2015.
Int. Cl. G06F 1/26 (2006.01); H02J 7/00 (2006.01)
CPC H02J 7/0021 (2013.01) [H02J 7/007 (2013.01); H02J 7/0052 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
determining, by a user device, that a charging adapter is connected to the user device, the user device comprising a first battery and a power management integrated circuit;
determining, by the user device using a power management integrated circuit, that the charging adapter has a rated maximum output current value;
determining that the rated maximum current value is greater than a first maximum charging load value of the first battery;
charging the first battery at the first maximum charging load value with a first charging current;
determining that a second battery is connected to the user device, the second battery having a second maximum charging load value that is greater than the first maximum charging load value;
determining a second charging current value that is a difference between the rated maximum current value and the first maximum charging load value;
charging the second battery at the second charging current value with a second charging current;
determining that the second charging current value is less than the second maximum charging load value;
increasing the second charging current to a third charging current value, wherein the third charging current value is less than the second maximum charging load value;
determining, by the user device using the power management integrated circuit, that an input voltage at the user device is equal to or greater than 4.75 volts;
increasing the second charging current to a fourth charging current value, wherein the fourth charging current value is less than the second maximum charging load value;
determining that the input voltage is less than 4.75 volts; and
reducing the second charging current to a fifth charging current value.