Contents I. Introduction
With the rapid development of new energy and intelligent control technologies, new energy products such as robots and electric vehicles have entered people's lives. However, how to ensure sufficient endurance for them has become a problem that people need to solve. The traditional contact-type conduction charging technology has complicated wiring, large space occupation, frequent insertion and removal in use, easy wear and tear, and may cause contact sparks to cause safety problems [1]–[2]. In recent years, the wireless power transfer (WPT) proposed by experts and scholars has provided new ideas for solving the problems of wired charging technology. So far, many experts and scholars have studied the working principle, overall architecture and load characteristics of wireless charging, and the magnetic coupling structure, which is the most important part of the wireless charging system, has naturally become the focus of research.
