| The wireless transmission of electric energy has been attracting much attention since it was put forward.Many scholars at home and abroad have done various researches in various fields.The magnetically coupled resonant wireless power transmission technology has many advantages.On the one hand,it can achieve energy transmission in long distance and depend less on transmission media;On the other hand,it requires the direction and angle of transmission not so complicating.That is,magnetically coupled resonant wireless power transmission technology has become the main research direction in wireless transmission technology.At present,the research of magnetically coupled resonant wireless power transmission technology mainly focuses on the traditional "one to one" coil transmission mode,but in some special cases,in order to meet the requirements of timeliness,there may need multiple receiver applications.The paper selects two receiving load cases for analysis.When the system load or coil distance changes,the output voltage of the system will also change,which will make the system's stability can be degraded,and affecting the quality of power supply,so we need to design a reliable control strategy to provide reliable electrical energy for electrical equipment.The thesis chooses the resonance circuit to analyze the transmission principle of single-load and dual-load MCR-WPT system by comparing the advantages and disadvantages of the field,coupled mode and circuit theory,and discusses the influence of coupling coefficient and load resistance on transmission efficiency,output power and voltage transmission ratio.And it concluded the change law of two kinds of influencing factors.After further analysis,the optimal transmission states of the single-load and dual-load MCR-WPT systems are obtained.The simulation of the single and two receiver coils of the MCR-WPT system is performed by MATLAB,which verifies the correctness of the theoretical analysis.In order to achieve a stable output of the system,a dual-load MCR-WPT system based on a DC-DC boost converter circuit was proposed.By using the integral to separate PID control,the duty cycle of the switching regulator was controlled in real time to maintain a constant load voltage at the receiving end.Then build the equivalent circuit model in MATLAB/SIMULINK,determine the parameters of each component of the main circuit of the system,and analyze the changes of the load terminal voltage when the load is switched and the coupling coefficient changes,and verify the control strategy through simulation,which is a good solution to solve the problem of unstable output voltage due to parameter changes.In the dual-load MCR-WPT system,the hardware design of voltage sampling circuit,the IGBT driver circuit,and the rectifier inverter circuit are briefly introduced.The selection and design of each circuit device are performed.The DSP-based hardware design for dual-load MCR-WPT system voltage regulation control is also presented.The resonant coil was further selected,and detailed calculations were performed for parameters such as self-inductance,mutual inductance,and parasitic resistance of the coil.In the experimental verification,the three-dimensional model of the MCR-WPT system was first simulated using the ANSYS Maxwell simulation software,and then experiments were performed on the same side of the coaxial cable and the other side of the coaxial cable through the experimental platform. |
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