A method for detecting a foreign metal object near an inductive wireless power transfer system is based on combined inductive sensing and thermal sensing. A sensing system senses the object based on an inductive or thermal effect. The sensing system includes a sense element which has an electrical characteristic that changes in a presence of the object based on the inductive effect. A mediating heat-sensitive material has a property that varies as a function of temperature and changes the electrical characteristic of the sense element as the property changes. The mediating heat-sensitive material is heated by the foreign object when the foreign object is heated by a magnetic field generated by the wireless power transfer system. A controller measures the electrical characteristic and determines a presence of the object based on the change in the measured electrical characteristics.
FOREIGN OBJECT DETECTION USING COMBINED INDUCTIVE AND THERMAL SENSING
FREMDKÖRPERDETEKTION MIT KOMBINIERTER INDUKTIVER UND THERMISCHER ERFASSUNG
DÉTECTION D'OBJET ÉTRANGER FAISANT APPEL À LA DÉTECTION INDUCTIVE ET THERMIQUE COMBINÉE
2024-12-11
Patent
Electronic Resource
English
Foreign object detection using combined inductive and thermal sensing
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