Omnidirectional Wireless Energy Transmission System Based On Multi-transmit Coil

Omnidirectional wireless energy transmission technology is a new type of power transmission technology,compared with traditional wireless energy transmission technology,can omnidirectional wireless energy transmission technology has the advantages of location good robustness,can have than traditional wireless energy transmission technology,the applicable scope of the wider is the development trend in the field of low power wireless can transmit.To achieve omnidirectional wireless power transmission,study of the direction of the wireless can transmit,get more directional magnetic field distribution is the important condition to realize omnidirectional wireless power transmission,this paper presents a new type of based on three in the space coordinate system X,Y and Z plane coil of omnidirectional wireless power transmission system.When the receiving coil needs a magnetic field in a certain direction,select different transmitting coil to conduct,and the all-direction wireless energy transmission can be realized.Based on the analysis of the electrical characteristics of the wireless energy transmission circuit,a control method based on the monitoring of the position current of the front end of the load is proposed.The relationship between the current and the side load power is derived through the formula.The current is measured by the coils before the formal operation of the system.The mutual inductance of the transmitting coil and the receiving coil is studied when the transmitting coil and the receiving coil are in different relative space positions,and the mutual inductance of the two coils is sorted out,according to which the mutual inductance of the receiving coil and the transmitting coil can be obtained and compared,and the transmitting coil can be selected accordingly.Comparing the two control methods of transmitting coil,the more precise control method based on mutual inductance between two coils is chosen,which can fully improve the efficiency of wireless energy transmission.Finally,a hardware prototype is built to successfully verify the power transmission capability of the omnidirectional wireless energy transmission technology.The experimental results show that the wireless energy transmission system is an omnidirectional wireless energy transmission technology,which can effectively receive the wireless energy even if the receiving coil moves or rotates in a limited three dimensional region.