US 12,316,146 B1
Systems for controlling charging of electrical devices
Nayana Teja Chiluvuri, Seattle, WA (US); Fu-Pang Hsu, Bellevue, WA (US); Xunwei Yu, Kirkland, WA (US); Zhao Xu, Bellevue, WA (US); Ming Feng, Cupertino, CA (US); Chang Hwa Rob Yang, Sammamish, WA (US); and Shelby Ovrom, Seattle, WA (US)
Assigned to AMAZON TECHNOLOGIES, INC., Seattle, WA (US)
Filed by AMAZON TECHNOLOGIES, INC., Seattle, WA (US)
Filed on Sep. 30, 2021, as Appl. No. 17/449,547.
Int. Cl. H02J 7/00 (2006.01)
CPC H02J 7/0031 (2013.01) [H02J 7/0036 (2013.01); H02J 7/0047 (2013.01); H02J 7/00714 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A system comprising:
a wearable device comprising:
a rechargeable battery;
a charging circuit connected to the rechargeable battery;
a charging contact connected to the charging circuit;
a ground contact connected to the charging circuit; and
a resistor connected between the charging contact and the ground contact, wherein the resistor is associated with a first resistance value; and
a charger device comprising:
first circuitry to provide a first voltage to the charging contact, wherein the first voltage is conducted across the resistor;
second circuitry to provide a second voltage greater than the first voltage to the charging contact, wherein the second voltage is conducted to the rechargeable battery; and
third circuitry in electrical communication with the charging contact and the ground contact, wherein the third circuitry detects a first current value associated with provision of the first voltage to the charging contact, and in response to the first current value being:
greater than a threshold minimum value that corresponds to the first resistance value, and
less than a threshold maximum value that is indicative of an alternate electrical conductive path between the charging contact and the ground contact,
the third circuitry causes the second circuitry to provide the second voltage to the charging contact to charge the rechargeable battery.