Inductive-capacitive combined power transfer system and its power superposition characteristic for rail transit inspection vehicle charging

An inductive-capacitive combined power transfer (ICCPT) system is proposed to meet the requirement of the fast charging for rail transit inspection vehicles (RTIV). Compared with existing wireless power transfer (WPT) systems with multi-ports, both inductive and capacitive couplers are used to eliminate the same-side coupling, and a dual-band compensation network is designed to realize the open-loop constant voltage (CV) output for the parallel-output. A reflection impedance model of the capacitive coupler is proposed, based on which an ICCPT system model is established. The dual-band compensation network is analyzed, and its parametric design is presented. The power superposition and CV output characteristics of the proposed system are proved theoretically. A 650 W ICCPT prototype is constructed and two sub-systems bear half of the total power. When the load varies from 10 to 100 Omega, the fluctuation of the output voltage is about 6%, and the maximum efficiency is 87.3%.

Automated summary

An inductive-capacitive combined power transfer system is proposed for fast charging of rail transit inspection vehicles. The system utilizes both inductive and capacitive couplers to eliminate same-side coupling and features a dual-band compensation network for open-loop constant voltage output. Theoretical analysis and experimental verification demonstrate the power superposition and efficiency of the system.