A Three-Stage-Five-Coil IPT System Based on Cylindrical Solenoid Coupler Applied to State Detection Equipment of HV Device

A three-stage-five-coil inductive power transfer (IPT) system which is based on cylindrical solenoid coupler (CSC) is proposed in this article. The shape and parameters of the CSC are optimized. The five litz coils compensated by series capacitors are considered to form an IPT system based on equivalent CLC/S/CLC compensation topology with constant voltage characteristics. The mutual inductance between compensation auxiliary coil (CAC) and power transfer coil could be changed by moving the position of CAC, and the freedom of parameter design is enhanced. Mathematical model and loss model of the system are established, and power transfer characteristics of the system are analyzed. The system is considered to be used as a power source for state detection equipment of high-voltage (HV) device to achieve long-distance IPT, the effect of the coupler on the HV electric field is verified. Finally, a prototype with a length of 1.54 m was built. Based on the platform, output voltage and dc-dc power transfer efficiency curves with changed input voltage and load are obtained. The maximum efficiency of the dc-dc system can reach about 60%.

Automated summary

This article proposes a three-stage-five-coil inductive power transfer (IPT) system based on a cylindrical solenoid coupler (CSC). The shape and parameters of the CSC are optimized, and an equivalent CLC/S/CLC compensation topology is used to achieve constant voltage characteristics. By changing the position of the compensation auxiliary coil (CAC), the mutual inductance between CAC and the power transfer coil can be adjusted, enhancing the design flexibility. Mathematical and loss models are established, and the power transfer characteristics of the system are analyzed. A prototype is built to verify the performance, achieving a maximum efficiency of about 60% for the dc-dc system.