| Wireless power transmission (WPT) technique has become one of the hottest topics forks enormous potential applications on industry, medical treatment, space science and etc. WPT technique makes it possible for electric and electronic devices working freely without wires, and sometimes it is the best/only solution for some special circumstances.The thesis mainly studies the transmission circuit and rectifying circuit for WPT technique. The main contributions of this thesis conclude:(1) The circuit of WPT system based on magnetic resonance. Firstly, acircuit model for the transmission circuit is founded and analyzed, which is great helpful for experiment. Secondly, the method of measuring resonate frequency of coils is studied, and an improvement for the measurement is presented to obtain a more accuracy result. Finally, the transmission circuit is constructed and measured, through adjusting the distances of each coils in the circuit, the circuit could work not only with high efficiency but also longer work distance.(2) The circuit for WPT system based on radiation. Firstly, theory about antenna is introduced and a microstrip patch antenna is designed in Advance Design System(ADS). Secondly, different rectifying circuits are introduced and the voltage doubler circuit is mainly studied. Thirdly, different diodes are simulated with each SPICE parameters in the rectifying circuit. Finally, a rectifying circuit is fabricated to test. |
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