Wireless power supply device

The invention provides a wireless power supply device, and belongs to the technical field of electronics, the device comprises an energy sending module and an energy receiving module, the energy sending module comprises a first electrode and a second electrode, and the energy receiving module comprises a third electrode and a fourth electrode; the energy sending module is used for sending a first electric signal to the biological tissue surface through the first electrode, and the frequency of the first electric signal is target transmission frequency; the energy receiving module is used for receiving a second electric signal corresponding to the first electric signal from the biological tissue through the third electrode, converting the second electric signal into direct-current voltage and outputting the direct-current voltage to the brain-computer interface equipment. According to the embodiment of the invention, a closed circuit can be formed through a forward path between the first electrode and the thir