Maxim Integrated Products, Inc.

Marvin Lyle Peak, Jr

Bradley M Harrington

Matthew Ray Harrington

Jason Allen Wortham

Urs H Mader

David Harrington

Angelo Genova

Joseph Brian Vanden Wymelenberg

A circuit is provided that includes a parasitic power circuit that powers a parasitic circuit. The parasitic power circuit derives a supply voltage from an external AC or other signal suitable for use as a communications signal. A PMOS transistor or transistors is utilized to enable a supply voltage capacitor to charge substantially to the same voltage as the channel voltage of the communications signal.

Active parasite power circuit

An electric circuit comprising means for communicating with an external device coupled to means for measuring the charge condition of an external battery. In some embodiments, the circuit comprises at least one level shifter for changing the reference voltage of communication signals. In some embodiments, the circuit comprises a first driver and a second driver for driving external switching elements for the controlled charge and discharge of the battery.

Low side NMOS protection circuit for battery pack application

Integrated MOSFET current sensing for fuel-gauging. A 1MOSFET through which the current is to be sensed is coupled to a 2MOSFET of the same type, the 2MOSFET being biased to have the same resistance as the 1MOSFET. The 2MOSFET has a much smaller area than the 1MOSFET, and is coupled to a current source representing a maximum current through the 1MOSFET. The voltage across the 1MOSFET relative to the voltage across the 2MOSFET provides a measure of the current through the 1MOSFET. Various embodiments are disclosed, including embodiments in battery packs to eliminate the need for additional and expensive external components.

Integrated MOSFET current sensing for fuel-gauging

Growing community of inventors

Highland Village, TX, United States of America

Marvin Lyle Peak, Jr