Research On Dual Port Solid-state Microwave Oven And Multiphysical Field Simulation And Experiment

Today,microwave ovens have become an indispensable part of people's lives.Magnetrons,as the core components of microwave ovens,have always played an important role in the development of microwave ovens,but their fixed and uncontrollable output frequency make the uniformity of microwave heating has been difficult to be effectively improved.In recent years,high-power solid-state microwave sources have been gradually applied to the field of microwave heating.On the one hand,microwave ovens using solid-state sources have extremely low operating voltage compared to traditional microwave ovens,and they are safer to operate;More importantly,solid-state microwave ovens can accurately control their output microwave power?frequency and phase,etc,the heating of food is more delicate and in-depth,microwave heating uniformity and efficiency can be effectively improved.Solid-state microwave ovens have gradually become an important direction for future microwave oven research.In this paper,the simulation design of high power and high efficiency solid-state amplifier is completed firstly,and the microwave antenna design and cavity matching are completed by HFSS software simulation,after that the machining test is carried out.Finally,the designed cavity model was used for the joint simulation of COMSOL with MATLAB,and the potato was used as a heating load to complete the multi-physics field simulation.After that,the test platform was built to complete the heating experiment.Mainly completed the following work:1.According to the design process of solid-state power amplifier,Firstly,the design index of power amplifier and the selection of finished device are determined.By using the ADS software and the model of the power amplifier,the matching of the input and output of the front and rear stages of the final power amplifier,the design of the bias circuit,the simulation of the large and small signals of the whole circuit,and the joint simulation of the schematic diagram and layout are completed.The simulation results show that the P1 dB of the amplifier in 2.4GHz is around 42 dBm,it's efficiency is higher than 55%.Finally,Altium Designer is used to draw PCB layout and processing.2.Using the original cavity model to complete the simulation of simplified work before.Five cups of 100 mL water were used as the matching load for microwave heating,and then complete PIFA antenna design using 3D simulation software HFSS simulation work.then processing antenna and the cavity,install the antenna on the top of the chamber,according to the simulation process,the antenna final testing results meet the design requirements.3.Establish a 3D geometric model of the same proportion in the multi-physics field simulation software COMSOL,considering the dielectric properties of potatoes,along with the change of temperature setting material parameters,boundary condition,meshing,electromagnetic-thermal coupling model is set up.The electromagnetic-thermal coupling model was established,and then MATLAB control script was used to study the multifrequency and multi-phase scanning simulation of potato under single and double ports.Finally,the microwave heating experiment of frequency and phase scanning under single port and double port was completed by building a test platform.