Patent ID: 7536577
Filing Date: 2009-05-19
Classification: G01V,G06F

Abstract:
1. A method for calibrating a power supply power measurement, said method comprising: providing a power supply output voltage to a first terminal of a sense resistor coupled between said power supply output voltage and a load to supply a load current to the load; connecting a first terminal of a precision reference resistor to said first terminal of said sense resistor; receiving a calibration command signal indicating a calibration state is in effect; selectively, in response to the calibration command signal indicating that a calibration state is in effect, conducting a precise predetermined current through said precision reference resistor to generate a voltage drop at a second terminal of said precision reference resistor, wherein the precise predetermined current differs in value from the load current; measuring a differential voltage between said second terminal of said precision reference resistor and said first terminal of said sense resistor to determine a reference current calibration value; and adjusting subsequent power supply output current measurements made with the sense resistor using the reference current calibration value.