Abstract
Power transmission is one of the key issues in wireless power transmission (WPT) systems and the maximum power transmission problem is considered in this paper. A load power model for the magnetic resonant coupling WPT system with string-to-string structure is carried out at first. And then, using the power normalization method, the theoretical performance is analyzed and a special working point called critical coupling point (CCP) is found. At this point, the system can transfer the possible maximum power. Thus, maximum power tracking (MPT) problem can be transformed into the critical coupling point tracking (CCPT) problem. Further, relationship between CCP and load resistance is analyzed. To achieve the maximum transmission power under any load, a DC-DC impedance conversion circuit is added at the receiving side so that the maximum power can be tracked by adjusting the equivalent load resistance dynamically. Simulation results show the effectiveness of the proposed method.
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