Patent ID: 9558884
Date: 2017-01-31
CPC Classifications: H01F,H02J

Claim:
1. A power transmission apparatus comprising: a cover part attached to one of a power transmitter and an electronic apparatus, the power transmitter including a primary-side coil connected to an alternating-current power supply and a primary-side resonant coil configured to receive power from the primary-side coil by electromagnetic induction, the electronic apparatus including a secondary-side coil; a secondary-side resonant coil disposed in the cover part, and configured to transmit to the secondary-side coil the power received from the primary-side resonant coil by magnetic field resonance generated between the primary-side resonant coil and the secondary-side resonant coil; a voltage fluctuation detecting part configured to detect voltage fluctuation occurring in the secondary-side resonant coil; and a communication part configured to transmit a signal that represents the voltage fluctuation detected by the voltage fluctuation detecting part, wherein the cover part is attached to the electronic apparatus including the secondary-side coil, and the communication part transmits the signal that represents the voltage fluctuation.