Research On The Design And Transmission Characteristics Of Inverter Power Supply In Low-Power Wireless Power Transmission System

Wireless power transmission technology(Wireless Power Transfer,WPT)has a great advantage over the traditional wired electrical energy transmission technology in avoiding electrical risk.At present,the researchers have done a lot of research on the working principle,system structure and transmission characteristics of the magnetic resonant WPT system.The radio energy transmission system is generally composed of high-frequency inverter power supply,coil and load.The key to realize the efficient transmission lies in the high-frequency power supply.At present,there are two main types of high-frequency power supply of WPT system: inverter power supply and amplified power supply.The enlarged power supply is less used because of its system structure,which is less used at present.And the inverter power supply because of its efficient and other characteristics,used more.Therefore,the research on the inverter power supply has been widely concerned about,especially the topology optimization,efficiency improvement,miniaturization and other contents of the inverter power supply.In this paper,we study an inverter power supply suitable for low-power WPT systems and analyze the transmission characteristics of WPT.In this paper,we first study WPT systems with WPT containing high frequency inverter circuits and obtain its transmission characteristics.This paper introduces the four basic circuit structures of magnetic resonance WPT system,analyzes the selected series resonance structure,deduced the power and efficiency of WPT system and system related parameters,the basic principle of single-phase full-bridge inverter circuit was discussed,and simulation software was used to conduct circuit simulation analysis to verify the feasibility of the system.Second,a high-frequency inverter circuit is studied.A filter circuit suitable for the high-frequency inverter circuit is designed to solve the electromagnetic interference problem caused by the switching device,so as to realize the output of the high-frequency inverter power supply without electromagnetic interference.Specific research contents include: the single-phase bridge inverter circuit power MOSFET switch tube selection and design,the IR2110 drive circuit design,discusses the working principle and design of TLP250 optical coupling isolation circuit,explore the software and hardware design ideas based on STM32F103 control circuit,and in order to reduce the electromagnetic interference in the circuit,improve the stability of the output signal,research and design of the fifth order Butterworth low-pass filter circuit.Finally,the transmission characteristics of low-power WPT system are studied based on the high frequency inverter power.Specifically,the technical indexes of high frequency inverter power are tested,and the experimental platform of low power WPT system is designed and built to test the WPT system under different structures with the transmission distance and the transmission characteristics under different loads.The power,efficiency changes with the coil distance experiment shows that the output power and output efficiency is not the same rule,and under different coil structure,the change of power and efficiency also has some differences,the paper of the high frequency inverter power and explore small power WPT transmission characteristics can provide a reference for the study of small power WPT system.