Simultaneous Wireless Power And Multi-bit Parallel Signals Transfer Technology With Hybrid PWM Modulation Waves Control

Magnetic coupling wireless power transfer(MC-WPT)has solved the problems of device wear and contact spark caused by traditional wire charging,now it has become a hot research topic for scholars at home and abroad.With the deepening of research,the realization of signal communication from the primary side to the secondary side has gradually become one of the difficulties which need to be solved in MC-WPT systems.The technology of simultaneous wireless power and information transfer(SWPIT)has emerged for the above demands.It has been widely used in the fields of human implantable medical equipment,electric vehicles,etc.SWPIT technology with the shared channel has gradually become a significant research direction of SWPIT technology due to the advantages of low cost and high flexibility.It is concluded that the existing SWPIT technology with the shared channel can only realize the serial signal transmission,and it is hard to decouple power and signal transfer without the expensive additional carrier injection circuits.Therefore,there are shortcomings such as slow signal transmission rate and high dependence of signal transmission on power transfer.To solve the above problems,based on the idea that the parallel signal transmission rate is faster than the serial signal and pulse width modulation(PWM),the simultaneous wireless power and multi-bit parallel signals transfer(SWPMPST)technology with hybrid modulation waves PWM control is proposed in this thesis.Firstly,the research status of MC-WPT technology and SWPIT technology are introduced,and the advantages of SWPIT technology with the shared channel are highlighted.The purpose and significance of this thesis are also expounded.After that,SWPIT technology with the shared channel is studied,and the principle of power transfer and signal transmission in the SWPIT system with the shared channel is analyzed.The common problems of most SWPIT systems with the shared channel are summarized.Then,the SWPMPST with hybrid modulation waves PWM control is proposed.The circuit structure is given and the working principle is described as follows: after the serial baseband signal is converted to multi-bit parallel signals with the serialparallel conversion circuit,by using hybrid modulation waves PWM modulation,the power and multi-bit parallel signals are modulated into the system,and the primary current containing the frequencies of the power and multi-bit parallel signal modulation waves is formed.On the secondary side,the power and signal frequency separation network is composed to separate the power and multi-bit parallel signals,and the decoupled simultaneous wireless power and multi-bit parallel signals transfer is achieved.Finally,the multi-bit parallel signals are converted to the serial baseband signal with the parallel-serial conversion circuit.Subsequently,the parameters of the SWPMPST system with hybrid modulation waves PWM control are designed.The mathematical model of the system is established,the power efficiency,crosstalk,and signal rate characteristics of the system are analyzed,and the relationship between the characteristics and parameters of the system is discussed.Finally,the parameter design principles are given in combination with the system frequency response.Finally,the simulation and experimental platform are built to verify the SWPMPST system with hybrid modulation waves PWM control.The simulation and experimental results show that the simultaneous wireless power and two-bit parallel signals transfer can be achieved stably under the condition of load fluctuation and DC voltage adjustment.Compared with the serial signal transmission,the baseband signal transmission rate is increased by 2 times.The thesis has 81 pictures,7 tables,and 88 references.