Analysis Of Magnetic Resonance Coupled Wireless Power Transfer System And Research On Detuning Control Strategy

Magnetic Resonant Wireless Power Transfer(MR-WPT)technology is one of the top ten technological breakthroughs in the world in recent years.Its advantages include:high transmission efficiency,suitable for medium transmission distance,and without any radiation effect on human body.In the foreseeable future,MR-WPT technology will be widely used in consumer electronics,biomedical,electric vehicles,military technology and other fields.The main work of this article is:1.Introduce the transmission principle of MR-WPT system in detail and use the mutual inductance theory to model the two-coil system.The relationships among transmission performance and working frequency,transmission distance and load of MR-WPT system are analyzed.2.To reduce the fluctuation of the transmission performance of the MR-WPT system with the change of transmission distance,a detuning method based on the differential phase-locked loop frequency tracking detuning control is adopted to realize the primary side detuning,secondary side resonance compensation detuning control strategy.The differential unit realizes the role of the phase detector.This method can generate non-oscillating quadrature signals without the output frequency signal,so that an accurate phase angle error signal can be obtained.By introducing the phase control unit,the output phase angle can be directly controlled.3.SIMULINK simulation is used to verify the performance of the control algorithm.The simulation results show that the proposed frequency tracking detuned control system has good steady-state and dynamic performance.4.A two-coil MR-WPT system with full-bridge inverter circuit based on DSP TMS320F28335 control is designed.Firstly,the transmission performance of the MR-WPT system with a resonant frequency of 100 kHz is tested under moderate power and moderate transmission distance,and then the detuning control strategy is implemented at a resonant frequency of 10 kHz.The performance was verified by experiments.The experimental results show the correctness of theoretical analysis and experimental device design.