| Wireless power transmission technology is an epoch-making technology,it transfers electric energy from the power supply side to the load side through various relay energy,such as electromagnetic field energy,microwave,and ultrasonic waves.Magnetically-coupled inductive wireless power transmission technology(MCI-WPT)is a special case of Wireless power transmission technology,which uses the electromagnetic field coupled between the receiving and transmitting coils to realize the non-contact transmission of electric energy.This paper introduces the advantages and disadvantages,classification,and domestic and foreign research status on wireless power transmission technology,discusses the coil structure of the magnetically-coupled inductive wireless power transmission technology,analyzes the frequency bifurcation phenomenon,and improves its transmission performance by optimizing the coil structure of magnetically-coupled inductive wireless power transmission system.The main contents of this paper are as follows:First of all,In this paper,RLC series and parallel resonant circuits are analyzed,the single-resonance compensation circuit and multi-resonance compensation circuit of magnetically-coupled inductive wireless power transmission system are studied,and their total impedance and resonance conditions are obtained.Second,this paper establishes a mathematical model of the two-coil magnetically-coupled inductive wireless power transmission system,writes the formulas of the frequency bifurcation reaction parameter and transmission efficiency,and analyzes the influence of frequency bifurcation on transmit-received wireless power transmission technology.Thirdly,based on the two-coil magnetically-coupled inductive wireless power transmission system,the influencing factors of the effective transmission distance are analyzed,it is concluded that increasing the radius or the number of turns of the transmitting coil and the receiving coil can effectively improve the transmission distance of the magnetically-coupled inductive wireless power transmission system.Then,in order to improve the efficiency of the magnetically-coupled inductive wireless power transmission system,this paper has studied the frequency bifurcation phenomenon of three-coil magnetically-coupled inductive wireless power transmission system.It is concluded that the transmission performance of the three-coil MCI-WPT system is better than that of the two-coil MCI-WPT system.Finally,this paper builds an experimental platform for the transmit-receive MCI-WPT system and the transmit-relay-receive MCI-WPT system.The following conclusions were found and verified: the performance of the three-coil MCI-WPT system with the large radius of the relay coil is higher than that of the three-coil MCI-WPT system with the same radius,The performance of the three-coil MCI-WPT system with the equal radius is higher than that of the two-coil MCI-WPT system with the equal radius. |
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