| Wireless power transfer(WPT)technology plays an irreplaceable role in Io T equipment,underwater power supply system,unmanned motion system and so on.Magnetically coupled WPT(MC-WPT)is one kind of the WPT technologies.By means of coil resonant coupling,high power and high efficiency of wireless energy transfer can be realized.So,it has been widely studied and applied in various fields.WPT technology provides a very practical and efficient solution for all kinds of equipment,such as power automation and unmanned operation.With the development of WPT technology,more and more applications empowered by WPT technology require high-speed communication to improve the robustness of the system while achieving high-performance power and information transmission.Based on the application system of MC-WPT technology,the topology of power and information parallel transmission system is designed in this paper,the feasibility of the proposed system was analyzed theoretically,and verified by simulation and experiment results.To analyze the interaction between energy and signal parallel transmission system,a coupling model of the system is established based on multi-coil mutual inductance coupling model method.The excitation voltage source,excitation current and current spectrum characteristics of power coil in MC-WPT system are analyzed.Based on the model,the coupling relationship between the signal transmission channel and the energy transmission channel is analyzed.The magnetic field distribution characteristics of the commonly used resonance coupling mechanism is analyzed.Based on the specific distribution of the magnetic field,several feasible signal coil structures are analyzed.To overcome the interference problems caused by non-ideal conditions such as lateral offset of the energy coupling mechanism,the related filter circuit is designed and analyzed.Finally,according to the frequency characteristic of the signal carrier and the current of the signal,the optimization method of the structure of the signal coil is discussed.To develop a related power transmission device,the resonance coupling coils commonly used are designed using the finite element simulation method,and the antiangle rotation characteristic is obtained.For the engineering application in this paper,an energy coupling mechanism with 200 W power output and transmission distance of 20 mm is designed based on the planar circular coupling mechanism.For this scenario,the LCCS resonant topology is selected and analyzed as the compensation structure,the output characteristics of the resonant topology and the parameter design method are analyzed,and the specific parameter design process is summarized.For the signal transmission system,the printed circuit board technology is used,the duplexer is used to achieve the isolated duplex communication of the signal,and the orthogonal frequency division multiplexing technology is used to improve the signal transmission rate and antiinterference ability.To verify the feasibility and validity of the theory,relevant circuit simulation models are built using commonly used simulation software,and related devices are built in the laboratory.The simulation and experimental results consistently verify the feasibility of the designed application system,and verify the correctness of this paper. |
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