Fairchild Semiconductor Corporation

University of Connecticut

James Meacham

Krishna R Pattipati

Balakumar Balasingam

Tai-Sik Hwang

Bharath Pattipati

Yaakov Bar-Shalom

Travis Williams

Brian French

Gopi Vinod Avvari

A method includes calculating a first estimated state of charge (SOC) of a battery at a first time, receiving a voltage value representing a measured voltage across the battery at a second time, calculating a filter gain at the second time, and calculating a second estimated SOC of the battery at the second time based on the first estimated SOC, the voltage value, and the filter gain. Another method includes storing, in a memory, a library of equivalent circuit models representing a battery, determining an operational mode of a battery based on a load associated with the battery, selecting one of the equivalent circuit models based on the determined operational mode, and calculating a state of charge of charge (SOC) of the battery using the selected equivalent circuit model.

Battery state of charge tracking, equivalent circuit selection and benchmarking

In a general aspect, a method can include providing an indication that the electronic device has changed from a battery charging state to a battery discharging state and measuring an initial measured state-of-charge (MSOC) value of a battery of the electronic device. In the event the initial MSOC value is above a threshold value, the method can further include determining a compensation value based on the initial MSOC value and the threshold value, determining an initial reported state of charge (RSOC) value by scaling the initial MSOC value using the compensation value and reporting the initial RSOC value using the electronic device.

Reported state-of-charge scaling

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Gorham, ME, United States of America

James Meacham