Magnetic Coupling Wireless Power Transfer provides an effective solution for the safe and reliable power supply of electrical equipment in unmanned environments such as deep space

deep sea and deep earth. With the development of the technology

various novel operation mechanisms

such as the parity-time symmetry mechanism and the complex eigenstate mechanism

have been proposed

but the differences in the principles of each mechanism are not fully recognized at present. In view of this

this paper firstly compares and analyzes the relationship between the characteristic values in the circuit discipline and the eigenvalues in the quantum and other disciplines

and confirms that the real eigenstate operation mechanism in the quantum and other disciplines is the self-excited oscillation mechanism in the circuit discipline. Then the physical principles

parameter criteria

realization methods and corresponding energy efficiency characteristics of the existing operation mechanisms are analyzed in detail

providing theoretical guidelines for the selection of the operation mechanism of the actual system. On this basis

we summarize the current research progress of the parity-time symmetry wireless power transfer system

and further discuss the existing key scientific and technological problems to be solved and the development trend.