A Small Wireless Power Transfer System for the Capsule Endoscopy

In order to solve the problem of energy limitation in capsule endoscopy, the button battery can be replaced by an external wireless power. A small wireless power transfer system for delivering power to capsule endoscopy has been presented here. The wireless power transfer system is built by using a small cylindrical receiving resonator and two cylindrical source resonators to transfer power through coupled magnetic resonance. Experimentally, it is found that the wireless power transfer efficiency is stable within a certain range due to the stable magnetic field generated by two source resonators. The proposed design has the significant advantage of stable power transfer and small size for capsule endoscopy.