PROCEDE DE RECHERCHE DE LA PRESENCE D'UN OBJET PARASITE POUR UNE UNITE EMETTRICE DE PUISSANCE PAR INDUCTION MAGNETIQUE

摘要

The method (60) involves defining a reference value of a main phase difference between a terminal voltage of a transmission coil of a transmitting unit and a current in the coil, and a reference value for effectiveness for transfer of power (600). The difference is estimated (610), and effectiveness for transfer of the power is estimated (611). A determination is made (630) to check whether a parasitic object is present in a coverage area by comparing the reference value of the difference and the estimated difference and the reference value for effectiveness with the estimated effectiveness. An independent claim is also included for a transmitting unit for a magnetic induction based power transmitting system.