Abstract: To calibrate a power measuring function of a wireless power device, an alternating electric signal is fed through a wireless power transmitter coil to drive the wireless power transmitter coil at an operating point. Voltage measurements and current measurements are performed upon the alternating electric signal or upon a current signal resulting therefrom. A power value is calculated from a resulting series of voltage values and series of current values. If, upon assessment, the calculated power value does not meet a specification, a compensatory change is introduced in the series of voltage values or current values to account for a phase shift between the voltage measurements and current measurements at the operating point. The compensatory change is stored and enables the power measuring function to produce wireless power measurement results at the operating point which are consistent with the specification.

Abstract: A method (1100) of calibrating a power measuring function (516; 716; 946) of a wireless power device (510; 710; 930) is presented. An alternating electric signal is fed (1110) through a wireless power transmitter coil (520; 720; 920) to drive the wireless power transmitter coil at an operating point. Voltage measurements and current measurements are performed (1120) upon said alternating electric signal or upon a current signal resulting therefrom in the wireless power device. A series of voltage values and a series of current values are produced (1130) from the voltage measurements and current measurements. A power value is calculated (1140) from the produced series of voltage values and series of current values. The method then assesses (1150) whether the calculated power value meets a specification.