Power source evaluation of a wireless power transfer system

With more than 230 products on store shelves and an estimation of 100 million wireless power devices in use by 2015 (IHS source), the wireless power market is rapidly growing. Moreover, current smartphones are used with several applications (music streaming, satellite navigation system or even NFC virtual key for car sharing) and thus a convenient power supply system is required. This paper addresses the complete modeling and characterization of this power source in a Wireless Power Transfer context by an original modeling approach. A good correlation between measurement and simulation is obtained both for electrical (e.g. input impedance, power, etc.) and electromagnetic (e.g. magnetic field) quantities. Through simulations performed on commercial software´s, the correlation simulation/measurement shows a difference of only 2% on the active power available on the load and the modeled behavior of the magnetic field corroborates with the measured one.