INFORMATION HANDLING SYSTEM BATTERY CHARGE MANAGEMENT IN A DYNAMIC DISCHARGE ENVIRONMENT
First Claim
Patent Images
1. An information handling system comprising:
- a housing;
a processor operable to execute instructions that process information;
one or more power rails interfaced with the processor to supply power to the processor at a predetermined voltage;
a power supply interfaced with the one or more power rails to provide the predetermined voltage;
an external power port integrated in the housing and operable to accept external power from an external power source;
a battery integrated in the housing and operable to store power; and
a charger interfaced with the external power port and the battery, the charger providing power to the power supply, the charger receiving power from the external power port to charge the battery in one of a constant current charge mode or a constant voltage charge mode;
wherein the power supply selectively provides power to the one or more power rails from just the battery, just the external power port or both the battery and the external power port; and
wherein the charger when in the constant voltage charge mode reduces a maximum current to charge the battery based upon a battery charge state and charges the battery at the maximum current, the charger in response to a subsequent decreased battery charge state limiting actual charge current to the battery based upon the maximum current in a predetermined manner.
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Abstract
Dynamic battery discharge at an information handling system during battery charge, such as to support increased power use associated with processor turbo mode, is managed by setting a reduced maximum charge current dynamically during constant voltage charging so that battery voltage droop from discharge does not result in command of an excessive charge current after the discharge.
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Citations
20 Claims
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1. An information handling system comprising:
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a housing; a processor operable to execute instructions that process information; one or more power rails interfaced with the processor to supply power to the processor at a predetermined voltage; a power supply interfaced with the one or more power rails to provide the predetermined voltage; an external power port integrated in the housing and operable to accept external power from an external power source; a battery integrated in the housing and operable to store power; and a charger interfaced with the external power port and the battery, the charger providing power to the power supply, the charger receiving power from the external power port to charge the battery in one of a constant current charge mode or a constant voltage charge mode; wherein the power supply selectively provides power to the one or more power rails from just the battery, just the external power port or both the battery and the external power port; and wherein the charger when in the constant voltage charge mode reduces a maximum current to charge the battery based upon a battery charge state and charges the battery at the maximum current, the charger in response to a subsequent decreased battery charge state limiting actual charge current to the battery based upon the maximum current in a predetermined manner. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for managing an information handling system battery charge, the method comprising:
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determining a maximum current to charge the battery at time increments; comparing the maximum current determined at each present time increment with a maximum current determined at one or more previous time increments; and if the maximum current of the one or more previous time increments is less than the maximum current determined at a present time increment, setting current to charge the battery based upon the lowest maximum current of the previous one or more time increments. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method for charging a battery, the method comprising:
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charging the battery in a constant current mode if the battery has below a predetermined voltage, the constant current mode applying a charging current of not greater than a maximum current; charging the battery in a constant voltage mode if the battery has at least the predetermined voltage, the constant voltage mode applying a current of less than the maximum current, the applied current determined from a measured voltage of the battery; while in the constant voltage mode, tracking the applied current over time; while in the constant voltage mode, detecting a decrease in the measured voltage of the battery that determines an increase in the applied current; and while in the constant voltage mode, in response to the detecting a decrease in the measured voltage of the battery that determines an increase in the applied current, adjusting the increase in the applied current according to a previous applied current. - View Dependent Claims (17, 18, 19, 20)
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Specification