Abstract
Wireless power transfer via magnetic couple resonance has been widely studied as an attractive research target. In order to improve the transmitting efficiency, not only increasing performance of antenna is important but also controlling secondary (receiver) side input impedance value. As a method of controlling secondary input impedance, the method of using a DC-DC converter is proposed in previous research. Mutual inductance what related to transmitting distance and load resistance value is needed to know for control the DC-DC converter. Moreover, the transmitting distance and load resistance has changed in actual WPT situation. Therefore, control method for DC-DC convertor what keep best efficiency in actual WPT situation is needed. In this paper, the novel method of controlling a DC-DC converter for maximize efficiency which used for wireless power transfer via magnetic couple resonance is proposed. A mutual inductance can be known the voltage sensor in secondary side by setting power supply voltage constant. Furthermore, efficiency could be maximized regardless of the state of load by controlling a DC-DC converter so that the secondary side voltage constant value. This principle was explained by equation. Thereby, even when transmission distance and a load resistance value change, wireless power transfer system keep best efficiency automatically without communication between primary to secondary side.
Highlights
Wireless Power Transfer (WPT) via magnetic resonant coupling which was first introduced in year 2007 [1]
In paper [4], experiment shows that transmission efficiency is increased by DC-DC converter
As a method of changing input impedance, DC-DC converter is more suitable for controlling secondary input impedance in WPT system because it has no mechanical elements and can fast response
Summary
Wireless Power Transfer (WPT) via magnetic resonant coupling which was first introduced in year 2007 [1]. With this method high transmission efficiency is obtainable over relatively larger gap compared to induction method. Controlling load impedance with DC-DC converter is proposed. In actual WPT system, transmitting distance and load value has been changing by operating condition. The control method for automatic adjustment in actual WPT system is not shown. The method for controlling DC-DC converter for WPT via magnetic resonant coupling is proposed. In an actual WPT system, control method of DC-DC converter for efficiency maximization automatically is explained.
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