Patent ID: 11901744
Assignee: SEIKO EPSON CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B  Y | IPC B  H

Claim 9:
10. A contactless power transmission system comprising a power transmitting device and a power receiving device,
wherein the power transmitting device is configured to:
contactlessly transmit a first signal having a first frequency and a first duty to the power receiving device, and
in a case where the power receiving device is in communication with the power transmitting device, contactlessly transmit a second signal having a second frequency that is different from the first frequency or having a second duty that is different from the first duty during a period having a prescribed length, and

the power receiving device, after contactlessly receiving the first signal from the power transmitting device, is configured to:
contactlessly receive the second signal from the power transmitting device,
in a case of having judged that a time length of a reception period during which the power receiving device has received the second signal is a first length, specify that an issued communication data issued by the power transmitting device is first communication data, and
in a case of having judged that the time length of the reception period is a second length that is different from the first length, specify that the issued communication data is second communication data that is different from the first communication data.