T
Thomas O'brien
Researcher at Qualcomm
Publications - 13
Citations - 172
Thomas O'brien is an academic researcher from Qualcomm. The author has contributed to research in topics: Terminal (electronics) & Voltage source. The author has an hindex of 5, co-authored 13 publications receiving 172 citations.
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Patent
Battery charging systems and methods with adjustable current limit
TL;DR: In this article, an electronic circuit comprising a regulator having an input coupled to a power source for receiving a voltage and a current and an output for providing an output current, an input voltage detection circuit coupled to the power source, and an adjustable current limit circuit for controlling the input or output current of the regulator was presented.
Patent
Systems and methods for charging a battery
Christian Gregory Sporck,Arikatla Varaprasad,Shadi Hawawini,Steve Hawley,Thomas O'brien,Kumar Seema,Aaron Melgar +6 more
TL;DR: In this article, a battery charger is configured to produce a charge current having a first current value into the battery, and control signals may be generated to increase the first voltage value of the input voltage if either the input current limit is activated or the duty cycle reaches a maximum duty cycle.
Patent
Charge pump circuits and methods
Kenneth C. Adkins,Sang Ton Ngo,M. Abid Hussain,Thomas O'brien,Sridhar Kotikalapoodi,George A. Hall +5 more
TL;DR: In this article, a charge pump is coupled in series with a second charge pump for supplying different power requirements of the circuit, such as low voltage, high voltage, and current.
Patent
Type-C factory and special operating mode support
Christian Gregory Sporck,Georgios Konstantinos Paparrizos,Hector Ivan Oporta,Shashank Prakash Mane,Bang Sup Lee,Thomas O'brien +5 more
TL;DR: In this paper, the authors present a system for testing devices adapted for connection to other devices using universal serial bus (USB) and demonstrate how a set of resistance values maintained by a USB Type-C connector can be used to control the startup of at least one processor on the device.
Patent
Systems and methods for cable resistance compensation
TL;DR: In this article, the authors present a circuit comprising a regulator coupled to receive an input voltage and an input current from an external power source across a cable, a voltage sensor coupled to sense the input voltage, a collapse detector coupled to detect whether or not the voltage is below a first value and a current limit circuit to control a maximum current in the regulator.