Study on impedance matching for magnetic resonant coupling wireless power transfer system

摘要

Magnetic resonant coupling wireless power transfer technology is a new type of power transmission technology. To maximize the power delivered on load at high efficiency, researchers usually adjust the system coupling state by using impedance matching techniques. In the paper, the condition of load power maximized is inferred by utilizing network theory. Aiming at the influence of the detuning between the primary and secondary coils on the efficiency and load power, some effective matching methods at load side are propose, such as the ideal transformer, T type LC network, and Π type LC network. The transmission efficiency and power before and after matching are evaluated using ADS simulation software and the results show that the load power and the efficiency are remarkably improved.