| In the process of achieving the strategic goal of "Double Carbon",Wireless Power Transmission(WPT)technology has become an emerging technology of great interest because it does not use electrical energy transmission medium,thus reducing the electrical energy loss in the transmission process.Among them,the Magnetic Coupling Resonant Wireless Power Transfer(MCR-WPT)technology has high transmission power,high efficiency,long distance and low electromagnetic radiation,and the multi-frequency and multi-load MCR-WPT system can meet the demand of synchronous power supply for different transmission frequency loads.However,the multi-frequency multi-load MCR-WPT system can meet the demand for simultaneous power supply to loads of different transmission frequencies.However,the complex energy transmission path between coils of multi-frequency multi-load MCR-WPT system greatly increases the difficulty of its design and control.For this reason,this paper conducts a study on the design of multi-frequency and multi-load MCR-WPT systems,trying to provide a unified system structure and its parameter design method,which has good theoretical research and engineering application value.Based on the analysis of the circuit topology and principle of multi-frequency multi-load MCR-WPT system,the paper selects the dual-frequency dual-load MCR-WPT system and conducts equivalent modeling analysis using Fundamental Harmonic Analysis(FHA)method to derive the expressions of system input and output power and transmission efficiency.According to the design requirements,the equivalent reflected impedance characteristics of the receiver side of the multi-frequency multi-load MCR-WPT system are studied under the case of multi-frequency power input,and the power channel flow of the power signal at different frequencies is analyzed.To be able to provide PWM control signals containing different signal frequency and amplitude information for the system inverter,Multi-frequency Multi-Amplitude(MFMA)superimposed modulation technique is proposed,which can realize the power distribution strategy among receiver loads simultaneously on the basis of a single inverter.The N-LC resonant compensation network is also designed to build an independent power transmission channel for the system.By analyzing the frequency characteristics of the input impedance of the dual-band,dual-load MCR-WPT system based on the N-LC resonant compensation network,the mathematical relationship between the system LC parameters and the system resonant frequency is deduced.According to the mapping relationship between system LC parameters and system resonant frequency,a multiobjective particle swarm(PSO)optimization algorithm is used to propose a multi-frequency and multi-load MCR-WPT system LC parameter optimization design scheme based on N-LC resonant compensation network,construct the parameter optimization adaptation function,and realize the synchronous optimization design of resonant frequency and power balance.To verify the effectiveness of the proposed system structure and parameter design method,simulations are performed from three aspects: multi-frequency input power supply,power distribution and independent power transmission channels.Finally,a set of experimental prototype of MFMA superimposed modulation-based dual-band,dual-load MCR-WPT system is built to verify the power distribution effect of different frequency channels. |
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