Power consumption monitoring device for a power source

摘要

Examples are disclosed for an integrated circuit (IC) device coupled to a battery-operated power supply unit, such as an IC in a mobile computing device or wireless phone, to accurately determine energy usage drawn from the power supply unit under rapidly dynamic circumstances. A current sense signal of a power line from the power supply unit is digitized. The digitized current sense is added to an accumulator at a rate that is approximately proportional to a voltage of the power line from the power supply unit. The accumulator is then outputted and scaled to units relevant to energy measurements. The energy measurement is used to estimate remaining battery life. Triggering the digitization of the current sense signal may be by use of a pulse generation circuit, or by use of an overflow indicator of an accumulator for a digitized voltage sense signal.

主权项

1. An apparatus comprising:
a current sensor to provide a first voltage that indicates a current delivered by an energy source; a first analog to digital converter (ADC) operably coupled to the current sensor, the ADC to digitize the first voltage; a voltage sensor to provide a second voltage that indicates voltage measurement of a voltage associated with the current delivered by the energy source; a first accumulator operably coupled to the first ADC and the voltage sensor, the first accumulator to accumulate the digitized first voltage based upon the second voltage to represent a measurement of energy; a second ADC operably coupled to the voltage sensor to digitize the second voltage; and a second accumulator operably coupled to the second ADC, the second accumulator to accumulate the digitized second voltages, the first accumulator operably coupled to the second accumulator and accumulate the digitized first voltage based on an overflow indicator provided by the second accumulator.