This disclosure provides systems, methods and apparatus for detecting a presence of an object. In one aspect an apparatus for detecting a presence of an object is provided. The apparatus includes a sense coil formed from a conductor having a predetermined shape configured to attenuate currents induced in the conductor by an external time-varying magnetic field. The sense coil has an electrical characteristic that varies as a function of the presence of the object. The apparatus comprises a detection circuit coupled to the sense coil and configured to detect the presence of the object in response to detecting a difference between a measured value of the electrical characteristic and a reference value for the electrical characteristic. The reference value for the electrical characteristic is substantially the same as the measured value of the electrical characteristic in the absence of the object over at least a portion of the sense coil.
CLOVER LEAF AND BUTTERFLY COIL STRUCTURES FOR FLAT WIRELESS COUPLING PROFILES IN WIRELESS POWER TRANSFER APPLICATIONS
KLEEBLATT- UND SCHMETTERLINGSSPULENSTRUKTUR FÜR FLACHE DRAHTLOSE KOPPLUNGSPROFILE IN ANWENDUNGEN ZUR DRAHTLOSEN STROMÜBERTRAGUNG
STRUCTURES DE BOBINES EN FORME DE TRÈFLE À QUATRE FEUILLES ET DE PAPILLON POUR DES PROFILS DE COUPLAGE SANS FIL PLATS DANS DES APPLICATIONS DE TRANSFERT D'ÉNERGIE SANS FIL
2017-12-27
Patent
Electronic Resource
English
IPC: | G01V Geophysik , GEOPHYSICS / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung |
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