A wireless power transmission system for robotic capsule endoscopy: Design and optimization

This paper presents an inductive coupled wireless power transmission (WPT) system for powering an endoscopic robotic capsule. The proposed WPT system was designed and optimized through manipulation of the core material, the quality factor (Q) and the load impedance matching of the receiving coil (RC). A MnZn ferrite core with high initial permeability was employed. The Q of the 3D RC was optimized by choosing an optimum number of strands and turns. At the optimum design condition the system was able to deliver at least 376 mW of usable power to the load when magnetic field (H-field) of 105 A/m was applied at the frequency of 250 kHz. The uniformity of H-field generated by the power transmitting coil (PTC) was sufficient to achieve 86% stability of received power. The proposed system reduces the required level of H-field by 50% and increases the load power by 22.3% as compared to the existing study.