Construction of a secure wireless power transfer system for robot fish

We have designed a prototype wireless power feeding system to the ornamental robot fish, considering it also as a preliminary experiment for application to the capsule endoscope. We insert a solenoidal resonator instead of the button battery in a robot fish, and send power wirelessly from the resonators which are placed above and below the aquarium. In order to mitigate the high voltage induced in the power transmitting coil due to the low coupling coefficient to the receiving resonator, the effect of operation frequency is studied, resulting in the choice of lower frequency. So as to comply with the EMC problems, electric/magnetic field distributions are measured being compared with ICNIRP recommendation. In addition, we have the real goldfish swim at the same time as the robot fish in the demo experiment for qualitative safety evidence.