Patent ID: 9088165
Filing Date: 2015-07-21
Classification: H02J

Abstract:
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 couple the portable device receiving coil to the power supply stand transmitting coil; and transmitting power from the transmitting coil to the receiving coil by magnetic induction while sending power adjustment signals from the portable device to the power supply stand to enable the power supply stand to adjust transmitting coil output based on the power adjustment signals and supply the power requested by the portable device, wherein the portable device compares the power received from the power supply stand to the power required with a given period; when the received power is lower than the required power, the portable device sends an increase-power-request signal to the power supply stand as the power adjustment signal; when the received power is greater than the required power, the portable device sends a decrease-power-request signal to the power supply stand as the power adjustment signal, wherein power adjustment signals include increase-power-request weighting values that increase corresponding to the size of the request to increase power supply stand output and/or rate-of-change weighting values that increase corresponding to the amount of change in the requested power; the weighting values, which are output with the given period, are added; and If the sum of the weighting values attains a set value, a foreign object is determined to be present.