초록 ▼

Accurate power usage for a portable information handling system is provided using input power measurement circuitry. A calibration step is performed when the portable information handling system is powered down and charging. The calibration step includes obtaining a battery charge measurement from a

Accurate power usage for a portable information handling system is provided using input power measurement circuitry. A calibration step is performed when the portable information handling system is powered down and charging. The calibration step includes obtaining a battery charge measurement from a battery, and then using this measurement to calibrate an input power measurement made with respect to power being provided by the AC/DC adapter. Known losses from other sources within the system can also be considered in the auto-calibration of the input power measurement. Subsequently, when the portable information handling system is powered on and operating on power provided by the AC/DC adapter, power usage can be determined and reported using the auto-calibrated input power measurement as an indication of the power usage of the portable information handling system.

대표청구항 ▼

1. A method for operating a portable information handling system to calibrate and determine power usage information, comprising: providing a portable information handling system including a battery, a charger, and an AC/DC adapter;powering down the portable information handling system;charging the b

1. A method for operating a portable information handling system to calibrate and determine power usage information, comprising: providing a portable information handling system including a battery, a charger, and an AC/DC adapter;powering down the portable information handling system;charging the battery using the AC/DC adapter;while powered down calibrating an input power measurement for the portable information handling system by measuring battery charge with the battery; measuring input power with the charger; andcomparing the input power measurement to the battery charge measurement to determine a calibration factor for the input power measurement;powering on the portable information handling system;operating the portable information handling system using power provided through the AC/DC adapter; anddetermining power usage for the portable information handling system by measuring input power with the charger; adjusting the input power measurement by the calibration factor to generate calibrated power usage information; andutilizing the calibrated power usage information as an indication of power usage for the portable information handling system. 2. The method of claim 1, further comprising considering power losses from known sources in the calibrating step. 3. The method of claim 2, wherein the considering step comprises considering power losses due to losses caused by circuitry within the charger and losses caused by circuitry with the AC/DC adapter. 4. The method of claim 1, further comprising using a resistor to measure input power with the charger. 5. The method of claim 1, further comprising using a resistor to measure battery charge with the battery. 6. The method of claim 1, further comprising obtaining battery charge information from the battery through a battery management unit within the battery. 7. The method of claim 1, further comprising using an efficiency curve for the AC/DC adapter to convert power usage information from a DC measurement to an AC measurement. 8. The method of claim 1, further comprising performing the calibration step a plurality of times to improve accuracy of the calibration factor. 9. The method of claim 1, further comprising performing the calibration step every time the portable information handling step is powered down and the battery is being charged. 10. The method of claim 1, further comprising performing the calibration step only if the battery is being charged from below a selected charge state.