Research On Parallel Transmission Technology Of Power And Signal For Double LCL WPT System

Magnetic Coupling induced Wireless Power Transfer(MC-WPT)technology is an important branch of Wireless Power Transfer(WPT)technology,which has the advantages of flexibility,security and stability,has become a hot topic in the field of WPT.With the development of research and the high requirement of power transmission quality in existing applications,it is necessary to exchange the primary and secondary side information to improve the performance of the system.In this paper,under the condition of not significantly affecting the power transmission characteristics in the dual LCL M-WPT system that there is a shared coupling channel power signal parallel problem,a new power signal parallel circuit topology is adopted to achieve signal transmission.The system is mainly composed of two parts: power transmission channel and signal transmission channel.In this paper,the mutual inductance equivalent model and the fundamental analysis method are used to analyze the two parts.For the power transmission of the system,this paper discusses the constant current and voltage stabilizing characteristics of LCL resonant topology,gives the calculation formula of parameters and the analysis of basic transmission characteristics.For the signal transmission channel of the system,this paper proposes a new method of using the energy compensation capacitor branch as a signal coupling circuit at the same time,which reduces the influence of the signal coupling circuit on the energy resonance compensation;clever use of the impedance characteristics of energy storage components and LCL compensation The filtering capability of the topology effectively reduces the impact of electrical energy transmission on signal transmission without the need for additional blocking circuits.In order to realize the half-duplex communication function of the system,this paper discusses the feasibility of the signal carrier modulation method 2ASK communication technology,and puts forward the specific realization circuit of the signal transmission related circuit.By analyzing the signal transmission voltage gain,signalto-noise ratio and signal transmission rate,a circuit parameter design method is proposed to reduce the cross-interference between power transmission and signal transmission.Finally,in order to verify the correctness and feasibility of the theory in this paper,the system simulation platform is built according to the parameter design method proposed above.The simulation results show that the system realizes the parallel transmission of electric energy signals,and the mutual influence between electric energy transmission and information transmission is very small.