| With the development of science and technology,wireless power transmission technology is applied more and more widely,especially in some special situation,and compared with traditional cable power supply.The wireless power transmission technology has its unique advantages,and can improve the reliability of power supply equipment,the convenience in the operation.For wireless power transmission system,the transmission distance and the external disturbance will cause the system frequency to deviate from the inherent resonance frequency,and thus causing the system transmission efficiency drop rapidly.In this paper,based on the research of the principle of the wireless power supply system,the coupling coil parameters are measured actually and calculated theoretically,the wireless power supply system is modeled according to the coil parameters,simulation is done using Matlab to analysis the transmitter and receiver parameters influence on the efficiency of the system.In this paper,the performance of the traditional frequency tracking control is analyzed,a frequency tracking strategy based on PID control and digital phase lock loop is proposed,and the transfer function of the loop is deduced,and also its loop control law is studied.Each module of the digital frequency tracking system is designed by HDL Verilog language,and the system is verified using Simulink and Modelsim software.On this basis,the digital frequency tracking system hardware circuit based on FPGA is designed,and tests are done.The dynamic waveform of the frequency tracking.is obtained,and the correctness and feasibility of the design strategy digital frequency tracking system based on the FPGA are verified.The digital control method overcomes many shortcomings of the traditional frequency tracking that using analog phase lock loop,it has the advantages that design is more flexible,and it is easy to modify and implement,and it will be not affected by temperature and voltage,and the center frequency programming is adjustable. |
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