Frequency analysis of current source inductively coupled power transmission circuit based on mathematical model algorithm

For inductively coupled power transmission system with low-order compensation, the primary current of loosely coupled transformer is sensitive to load changes, which makes the output power unstable. When the working frequency of the system is the natural resonance frequency of the secondary side, the primary winding current of the loosely coupled transformer can be kept constant when the load changes. In this paper, the dynamic characteristics of a current source inductively coupled power transmission system are analyzed, and the resonant frequency of the circuit is discussed. Based on the mathematical model algorithm, the general solutions of different state variables are obtained, and the different resonant frequencies are discussed. Under certain parameters, simplified expressions of resonant frequency under different conditions are obtained by approximation. At this time, the resonant frequencies of primary and secondary sides are only related to the parameters of their respective sides. In the system, energy can be transmitted from a stationary primary power supply to one or more movable secondary loads through electromagnetic fields. Because it does not need to be contacted by wires, potential hazards caused by contact are avoided.