Research And Application Of Key Issues In Wireless Power Transmission

Wireless power transmission is a kind of new energy transmission technology based on magnetic field and electric field.It uses near-field magnetic coupling characteristics,based on the principle of resonance to achieve the wireless transmission of energy.This method is safe,efficient,stability and other advantages.Wireless power transmission is mainly used for wireless charging of electrical equipment.At present,the traditional way of charging mainly use wires to connect power and electrical equipment,damaged wires exposed in the air not only exists security risks,but also occupy a lot of space,resulting in cumbersome indoor wiring,charging equipment mobility is poor.Wireless charging is a way of non-contact charging,which can overcome many shortcomings of traditional power transmission.Compared with wired charging,the wireless charging method is flexible and can quickly and safely charge the electrical equipment,which makes up the shortage of the traditional charging way in security and occupying the space and so on.Therefore,the research of wireless power transmission technology has important practical significance and application value.The key of wireless energy transmission refers to the transmission medium of physical space,such as high-frequency alternating magnetic field,microwave,electromagnetic wave,RF radio wave to realize the transmission of power from the transmitter to the receiver through non-contact.In this paper,based on the analysis of the development of wireless power transmission at home and abroad,and on the basis of relevant application background,through the study of wireless power transmission principle and transmission characteristics,as well as the simulation and analysis of the model,the wireless power transmission technology will be applied to wireless charging,and design of the wireless charging system circuit.The main of this paper work as follows:Firstly,the wireless power transmission system is analyzed and studied,including: wireless power transmission differences,the basic principles of wireless power transmission and the current research key problems and trends and application prospects,put out research plan combined with the subject program.Secondly,through the theoretical analysis and simulation of the wireless power transmission model,the influence of the change of the key parameters on the system transmission efficiency and transmission characteristics is investigated.Including the influence of different distances on the mutual inductance parameters,the influence of different mutual inductance parameters on the transmission efficiency,different frequency different load different topological structure to the transmission characteristic influence and so on,through the research and the analysis,has provided the theory instruction for the wireless charging system hardware platform construction.Finally,in this paper,combined the study of wireless power transmission characteristics,designed to charge the battery for the wireless charging system hardware circuit,including power supply circuit,DC-AC inverter circuit,protection circuit,control circuit,acquisition circuit and frequency adjustment circuit,and then the relevant parameters of the collection and experimental analysis,the final completion of a transmission distance of 6cm,the transmission efficiency of up to 83%,transmission power of 30 W wireless charging system.