Detecting device removal from surface of multi-coil wireless charging device

• Main Authors: WINTERS JUSTIN, GOODCHILD, ERIC, H, SCOTT JAMES
• Format: Patent
• Language: Chinese; English
• Published: 29.04.2022
• Subjects: CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DETECTING MASSES OR OBJECTS; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERATION; GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE; MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION,OR SHOCK; MEASURING MAGNETIC VARIABLES; PHYSICS; PRINTED CIRCUITS; SYSTEMS FOR STORING ELECTRIC ENERGY; TESTING

Systems, methods, and devices for wireless charging are disclosed. The charging device has a plurality of charging units disposed on a charging surface, a charging circuit, and a controller. The controller may be configured to cause the charging circuit to provide a charging current to the resonant circuit when the receiving device is placed on the charging surface; providing a measurement time slot by lowering or terminating the charging current of the charging circuit for a period of time; and determining whether the receiving device has been removed from the charging surface based on a measurement result of a characteristic of the resonant circuit during the measurement time slot. A characteristic of the resonant circuit may represent an electromagnetic coupling between a transmitting coil in the resonant circuit and a receiving coil in the receiving device. 公开了用于无线充电的系统、方法以及设备。充电装置具有被设置在充电表面上的多个充电单元、充电电路以及控制器。可以将控制器配置成，使充电电路在接收装置置于充电表面上时，向谐振电路提供充电电流；通过使充电电路降低或终止充电电流达一定时段来提供测量时隙；以及基于在测量时隙期间的谐振电路的特性的测量结果来确定