Current monitor circuit
AssigneeHewlett-Packard Development Company, L.P.
InventorRonald R Gross
Life of this patent
Estimating the term…
Abstract
A current monitor circuit includes a sense resistor coupled to a direct current (DC) power supply to sense a current signal, an operational amplifier (op-amp) coupled to the sense resistor to sense a voltage developed across the sense resistor, and a low-pass filter coupled to the op-amp and an analog-to-digital converter (ADC). The low-pass filter reduces aliasing due to out-of-band signal content. The current monitor circuit is coupled to the ADC to provide real-time measurements of power supply load current as input to an active power management (APM) firmware.
Claims15
A current monitor circuit comprising:
- a sense resistor coupled to a direct current (DC) power supply to sense a current signal;
- an operational amplifier (op-amp) coupled to the sense resistor to sense a voltage developed across the sense resistor;
- and
- a low-pass filter coupled to the op-amp and an analog-to-digital converter (ADC), the low-pass filter to reduce aliasing due to out-of-band signal content,
- wherein the current monitor circuit is coupled to the ADC to provide real-time measurements of power supply load current.
A system to monitor a current load comprising:
- a direct current (DC) power supply to supply power to an electronic device;
- a current monitor circuit comprising:
- a sense resistor coupled to a direct current (DC) power supply to sense a current signal;
- an operational amplifier (op-amp) coupled to the sense resistor to sense a voltage developed across the sense resistor;
- and
- a low-pass filter coupled to the op-amp and an analog-to-digital converter (ADC), the low-pass filter to remove aliasing due to out-of-band signal content;
- and
- wherein the current monitor circuit;
- computes a power supply load based on the output of the current monitor circuit;
- and
- regulates power distributed through the electronic device based on the power supply load.
A computer program product for monitoring a current load of a power supply, the computer program product comprising:
- a non-transitory computer readable storage medium comprising computer usable program code embodied therewith, the computer usable program code to, when executed by a processor:
- compute a power supply load based on the output of a current monitor circuit, the current monitor circuit comprising:
- a sense resistor coupled to a direct current (DC) power supply to sense a current signal;
- at least one operational amplifier (op-amp) coupled to the sense resistor to sense a voltage developed across the sense resistor;
- and
- a low-pass filter coupled to the op-amp and an analog-to-digital converter (ADC), the low-pass filter to remove aliasing due to out-of-band signal content;
- and
- regulate power distributed through the electronic device based on the power supply load.
Dependencies are inferred from the claim text.