Patent ID: 9685824
Date: 2017-06-20
CPC Classifications: B60L,H02J,Y02T

Claim:
1. A contactless method of supplying power comprising: placing a portable device housing a receiving coil on a power supply stand provided with a transmitting coil and magnetically coupling the receiving coil of portable device to the transmitting coil of the power supply stand; and transmitting power from the transmitting coil to the receiving coil by magnetic induction while transmitting power adjustment signals from the portable device to the power supply stand, the power supply stand adjusting a transmitting coil output and supplying power requested by the portable device based on the power adjustment signals, wherein the power supply stand limits maximum output to a power output threshold value; wherein the portable device compares the power received from the power supply stand to a required power, and if the received power is lower than the required power, then the portable device sends an increase-power-request signal to the power supply stand as the power adjustment signal and the power supply stand increases the transmitting coil output, and if the received power is greater than the required power, then the portable device sends a decrease-power-request signal to the power supply stand and the power supply stand decreases the transmitting coil output, wherein the power supply stand adjusts output while limiting it to the power output threshold value, and wherein the power supply stand detects a duration of the increase-power-request signals from the portable device to the power supply stand, and if the increase-power-request signals are longer than a preset time period, then the power supply stand determines that a foreign object is present on the power supply stand.