Patent ID: 7759964
Filing Date: 2010-07-20
Classification: G01R,H02M

Abstract:
1. An apparatus to measure voltage, current and power comprising: a switching power supply stage of a power supply comprising an inductor and a switching device; a voltage measuring module configured to detect a peak voltage across the inductor for at least a portion of a switching period of the switching power supply stage, the peak voltage measured across the inductor being substantially proportional to a voltage at a power measurement point, wherein the power measurement point is a location in the power supply where a power measurement is desired; a current measuring module configured to detect a peak current in the switching power supply stage for at least a portion of a switching period of the switching power supply stage, the peak current being substantially proportional to a current at the power measurement point; a power measurement module configured to multiply the peak voltage with the peak current and a constant to obtain a power measurement substantially equal to the power measurement at the power measurement point.