Dan R Poole

US Patent:

6789026, Sep 7, 2004

Filed:

May 2, 2003

Appl. No.:

10/428689

Inventors:

Evgenij Barsoukov - Dallas TX
Dan R. Poole - Austin TX
David L. Freeman - McKinley TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G01R 3136

US Classification:

702 63, 320104, 320132, 324427, 324428

Abstract:

A processor ( ) operates to determine amount of charge presently stored in a battery by determining that the battery is in a zero-current relaxed condition. Circuitry ( ) including a first ADC ( ) measures an open circuit voltage (OCV) of the battery prior to a period of time during which flow of current through the battery is not negligible. A program executed by the processor correlates the measured open circuit voltage (OCV ) with a corresponding value of the variable and selects the corresponding value as a value of the variable.

US Patent:

6832171, Dec 14, 2004

Filed:

May 2, 2003

Appl. No.:

10/428659

Inventors:

Evgenij Barsoukov - Dallas TX
Dan R. Poole - Austin TX
David L. Freeman - McKinley TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G01R 2500

US Classification:

702 65, 320132

Abstract:

An internal impedance of a battery ( ) is automatically determined by operating a processor ( ) to analyze current flowing through the battery to determine if a transient condition due to change of current is occurring and determining when the transient condition has ended. A voltage of the battery is measured while a steady current is being supplied by the battery. The present depth of discharge (DOD) of the battery is determined and a database is accessed to determine a corresponding value of open circuit voltage. The internal impedance is computed by dividing the difference between the measured voltage of the battery and the open circuit voltage at the present DOD by an average value of the steady current. A remaining run-time of the battery can be determined using a total zero-current capacity of the battery, integrating the current to determine a net transfer of charge from the battery, determining a value of total run-time that would be required to reduce the voltage of the battery to a predetermined lower limit, determining the duration of the integrating, and determining the remaining run-time by subtracting the duration of the integrating from the total run-time.

US Patent:

6892148, May 10, 2005

Filed:

May 2, 2003

Appl. No.:

10/428704

Inventors:

Evgenij Barsoukov - Dallas TX, US
Dan R. Poole - Austin TX, US
David L. Freeman - McKinley TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G01R031/36

US Classification:

702 63, 320132, 324427, 702 65

Abstract:

The remaining run-time (t_rem) of a battery is determined independently of the condition of the battery and the amount of load on the battery by obtaining the value of a present total zero-current capacity (Qmax) of the battery based on relaxed-battery OCV values measured just before and just after a charging or discharging cycle. A current through the battery is integrated to determine a transfer of charge (Q) from the battery, and a value of total run-time (t_total) that would be required to reduce the open circuit voltage of the battery to a predetermined lower limit (Vmin) is determined. The remaining run-time (t_rem) is determined by subtracting the duration of the integrating from the total run-time (t_total).

US Patent:

7443140, Oct 28, 2008

Filed:

Jan 11, 2006

Appl. No.:

11/329799

Inventors:

Yevgen Barsukov - Richardson TX, US
Dan Russell Poole - Austin TX, US
Jinrong Qian - Plano TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H02J 7/00

US Classification:

320136, 320135, 324427

Abstract:

A method for terminating battery discharge to avoid battery damage and maximize battery usage includes the steps of: (a) determining battery capacity; (b) storing a capacity result of the capacity determining; (c) determining battery voltage; (d) during a monitored battery operation, integrating battery current flow over a time interval to determine an integrated charge value at an end-of-interval-time; (e) determining an extant depth of discharge at the end-of-interval-time; (f) if the extant depth of discharge is neither within a first range of a maximum depth of discharge nor the battery voltage is within a second range of a minimum battery voltage, carrying out steps (d) through (f); (h) if the extant depth of discharge is within the first range of the maximum depth of discharge or if the battery voltage is within the second range of the minimum battery voltage, terminating the monitored battery operation.