Amazon Technologies, Inc.

Xunwei Yu

Chang Hwa Rob Yang

Nayana Teja Chiluvuri

Kenneth Lawrence Staton

Matthew Liang Chaboud

Pushkaraksha Gejji

Cameron Dean Whitehouse

Ming Feng

Sajesh Kumar Saran

Krzysztof Marcin Walczak

Fu-Pang Hsu

Zhao Xu

Shelby Ovrom

A charger prevents charging of a wearable device battery when sweat or another conductive contaminant is present. The charger initially provides a low voltage to detect when the wearable device is engaged. When the wearable device is engaged, a measured current value exceeds a threshold minimum value. If sweat or another conductive contaminant is present, the additional conductive pathway provided by the contaminant will cause the measured value to exceed a threshold maximum, and charging of the battery is prevented. If a contaminant is not present, the measured value will be greater than the threshold minimum and less than the threshold maximum. A higher voltage may then be provided to charge the battery. When the device is removed from the charger, the measured value will decrease below the threshold minimum and the charger may return to providing low voltage to detect engagement of the device.

Systems for controlling charging of electrical devices

Described is an apparatus to concurrently measure multiple input voltages at a high sampling data rate, such as at least two mega-samples per second. The apparatus may include a plurality of voltage data acquisition components that concurrently sample different input voltages and produce respective voltage data samples. Each of the plurality of voltage data acquisition components may be directly coupled to a field programmable gate array that receives the voltage data samples, packetizes those voltage data samples, and provide the packetized voltage data samples to a system on chip.

Synchronous voltage signature data collection apparatus

Growing community of inventors

Kirkland, WA, United States of America

Xunwei Yu