Research On Identification And Resonance Decoupling Methods Based On Radio Energy Transmission

Wireless Power Transfer(WPT)is a brand new power transfer technology,which is completely different from traditional cable transfer.Compared to cable transfer,wireless power transfer is more flexible,which has better penetrability to non-metallic obstacles,and no power plug was required.Wireless power transfer improves the security of the power transfer,and brings great convenience for people's life.With the development of the research,wireless power transfer technology has been applied to all aspects of our life.For the untargeted,non-directional features and prone to be in danger of "stolen",an identification and resonance decoupling method based on frequency hopping communication is proposed in this article.The basic principle of identification method is to make the resonance frequency of the transmitting and receiving coils is randomly and synchronously changed according to the pseudo-random code sequence.Only when frequency hopping clock,hopping frequency and hopping sequence are all completely consistent,energy can be transmitted.And then determine whether the system is currently secure by detecting the power transmission status.By calculating system transmission efficiency and system energy consumption ratio method to determine the identity of the load in single-source single-user mode and single-source multi-user mode respectively,the power value of all receivers is transmitted to the transmitter end and compared with the total power value sent by the transmitter.If the obtained result is within the set normal range,the current resonance state is maintained,and if it is out of the normal range,the frequency of transfer and receiver coils hopping synchronously.Resonance decoupling is to make the wireless power transfer system to avoid the illegal user's resonant frequency.The basic principle is to break the resonant state between transfer coil and receiving coil and cut off the coupling magnetic field.The basic method is to change the number of capacitors connected to the resonant coil in the resonant frequency hopping array.The basic principle of wireless power transfer and frequency hopping communication were analyzed.Then the theory of identification and resonance decoupling is analyzed,and the method of realization is disserted.Based on the theoretical analysis,a hardware experimental platform is designed and the software is programmed.The proposed identification and resonance decoupling method are verified and the results are consistent with the theoretical analysis.The correctness of this method is proved,and experiments show that this method has less impact on the"legitimate" users.This research not only provides a solution to the power management of wireless power transfer system,but also plays a supporting role in electricity metering and is conducive to the further application and promotion of wireless power transfer technology.