| The biggest feature of wireless energy transmission technology is that there is no electrical connection line and interface between the electrical load and the power supply equipment,and it can realize non-contact isolated power supply to the electrical equipment.Applying wireless energy transmission technology to high-temperature and humid kitchens can improve the safety and convenience of kitchen electrical use.However,the traditional "one-to-one" wireless energy transmission system with a single transmitting coil and a single receiving load has certain limitations in the kitchen environment with a large number of types of loads.The "many-to-many" wireless energy transmission system with multiple transmitting coils supplying multiple loads at the same time can better meet the power supply requirements of kitchen appliances..However,the "many-to-many" wireless energy transmission system has a complex structure,and it is difficult to design the transmission array and it is difficult to achieve multi-load compatibility.In this paper,based on the above background,a "many to many" wireless energy transmission system is studied.Based on the similarity in principle between wireless energy transmission and induction heating technology,combined with the functional requirements of the kitchen appliance power supply system,this paper proposes a "many-to-many" wireless energy transmission system structure compatible with two types of loads: iron pot and rice cooker.The resonance compensation topology matching the system operating conditions is selected,and the circuit model is established for analysis,and its impedance characteristics and power efficiency expressions are derived.From the perspective of circuit theory and energy coupling,the effect of mutual coupling between multiple transmitting coils on the system is analyzed.The transmit coil array is the core of a "many to many" system,and the form of the transmit coil array directly affects the performance of the system.This paper focuses on the research and design of the transmitter array,selects the shape of the coil,proposes a transmitter coil structure that can effectively reduce the coupling between the transmitter coils.Designs a coil arrangement method that can generate a relatively uniform magnetic field to provide stable power supply to a load at any position,and a multi-transmission coil connection method that meets the requirements of independent conduction and arbitrary switching of the coil.The complete topological structure of the system is proposed,and combined with the array form,a multi-transmission coil switching strategy and primary power adjustment strategy with area control are proposed.The rationality of system topology design and the feasibility of control strategy are verified through simulation.Corresponding to the system topology,the main hardware circuit is designed,and the parameter calculation and device selection are performed for the rectifier,inverter and switching circuit.The driving circuit and main control circuit are designed.Through the joint simulation method of ANSYS-Maxwell and ANSYS-Simplorer software,the system field-circuit coupling simulation model is established and analyzed,and the basic voltage and current waveforms of each part of the circuit are obtained to verify the compatibility of the power supply system to the two loads.Study the load phase shifting power modulation characteristics and the power efficiency characteristics of the load at different positions on and above the power supply surface. |
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