Power Stabilization Based on Double Energized Transmitting Coils in Dynamic Wireless Charging System for Inspection Robot

In a dynamic wireless charging system with short segmented transmitting coils, the operation mode of a single energized transmitting coil causes large power drop when the receiving coil moves to the central position between two transmitting coils. Power stabilization based on double energized transmitting coils is proposed to solve this issue. Firstly, the dynamic wireless charging system for inspection robots based on series short segmented transmitting coils and LCC compensation circuit in transmitting side is presented. Secondly, the uniform circuit model of wireless power transfer systems with single transmitting coil or double transmitting coils is developed. The system characteristics of a single energized transmitting coil and double energized transmitting coils varying with the position of the receiving coil are analyzed comparatively in one cycle of switching control of the segmented transmitting coils. According to the comparative analysis, when the receiving coil is at the central position between the two transmitting coils, the receiving power is stabilized by using the double energized transmitting coil structure. The relevant experiments are designed to verify the theoretical research.