Research On Power Characteristical Of Wireless Power Transmission Via Magnetic Resonance Coupling

The wireless power transmission systems via magnetic resonance coupling (RWPT) can have the same the advantage of high transmission power as induction radio transmission system, and the distance can be appropriately increased because it is a loose coupling transmission system.The mathematical models of the resonant circuit and the transmission circuit are given on theoretically, and related parameters are calculated. Then studied on high frequency ac inverter circuit, resonant circuit, the power transmission circuit, the frequency tracking circuit and drive pulse used for maintaining high transmission efficiency and power.First of all, summarize and compare three stages of wireless charging technology, analyses and studies thire technical characteristics, advantages and disadvantages. Summarize and compare the advantages and disadvantages of five ways of resonant circuit topology.To give some methods to improve the efficiency and distance of transmission.Then, analyse the theory of the two high-frequency AC circuits systems. RWPT resonance coupling model is built using the circuit model theory, and the consequence of the calculation is same as the consequence of the simulation. When the loads and distance of SS, SP resonant circuits are different, comparison the differences of their transmission characteristics through simulation.Moreover, choose the methed of frequency tracking to keep the whole system working at high power, high efficiency transmission state. Found that the tracking of the current frequency of transmitter of SP topology is the best. The simulation results said this kind of tracking methed can complete tracking purposes, and the transmission efficiency and power of system are better than no tracking system circuit.Finally, giving the idea designed by FPGA to produce the driving voltage, and join the frequency tracking module into driving voltage to realize frequency tracking. Then designed the hardware circuit experiment, and the reliability of the full bridge inverter circuit and class E amplifier circuit parameters are calculated. Combination of software and hardware, and realizes the drive pulse of FPGA, the hardware circuit to complete the function of high frequency inverter, realizing the real-time track of the resonant frequency of the whole circuit function.