Abstract
Aiming at the risk of electricity theft of wireless power transfer (WPT) technology due to its untargeted and non-directional characteristics, a novel method of identification and resonance decoupling based on frequency hopping communication is proposed. The basic principle of the identification method is to make the resonant frequency of transmitter coil and receiver coil jump synchronously and randomly according to the pseudo-random code sequence, which can identify the load in single-source single-user mode and single-source multi-user mode respectively by calculating energy consumption ratio. And if user is illegal, then the resonant frequency of system jumps randomly to cut off the power, which is named resonance decoupling. The experimental circuit is designed on the basis of theoretical analysis and the method is verified. The test results are consistent with theoretical analysis, which has proved the validity of the method. This paper not only provides a solution to the power management of WPT system, but also is a support for the measurement of electricity, moreover, it is conducive to the further application and promotion of WPT technology.
Highlights
Wireless Power Transfer (WPT) is a new technology which can bring innovatory progress in power transmission field
Much of the literature on coupled magnetic resonance (CMR) takes as its focus several issues, such as characteristics of power transfer efficiency (PTE, the ratio of the power received by the load to the power emitted by the transmitter coil) [7]–[9], characteristics of transmission [10]–[12] and modelling of CMR system [13], [14], which had achieved excellent research results
This paper proposed a novel method of identification and resonance decoupling based on frequency hopping (FH) communication
Summary
Wireless Power Transfer (WPT) is a new technology which can bring innovatory progress in power transmission field. The principle of identification based on FH is that the resonant frequency of the transmitter (Tx) coil and receiver (Rx) coil can be changed randomly according to pseudo-random (PR) code. The identification method proposed requires that the resonant frequency hopping randomly, identification can still be achieved without affecting PTE according to experimental results. The same FH instruction generated by the receiver PR code generator to change the resonant frequency of Rx coil synchronously. The transmitter sends the time synchronization signal to the receivers, start identification process It is judged whether the system has an illegal user by controlling the DDS amplitude to keep the transmission power constant.
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