| 摘要 |
PROBLEM TO BE SOLVED: To prevent an excessive voltage from being input into a power receiving device in wireless power transmission.SOLUTION: A power transmission device that wirelessly transmits power to one or more power receiving devices detects, if the total amount of power which is received by the one or more power receiving devices changes, whether the amount of change is larger than a predetermined amount. When detecting a larger change than the predetermined amount for the total amount, the power transmission device performs control so as to stop power transmission to the one or more power receiving devices or suppress the power transmitted to a predetermined power or less. Then, in a state where the power transmission is stopped or the power transmitted is suppressed to the predetermined power or less, the power transmission device specifies one of the power receiving devices, which exists within a power transmission range of the power transmission device and receives power from the power transmission device, and a reception power which is received by the power receiving device; and after specifying them, resumes transmission of the specified reception power to the specified power receiving device. |
