高自由度受限全向无线能量传输与可重构方法

In magnetic coupled wireless power transfer (WPT) systems, 2-D planar coils or 3-D polyhedral coils are often used as coupling structures. Two-dimensional planar coils are sensitive to spatial position changes in the coupling structure. Although existing 3-D polyhedral coils can achieve omnidirectional high degrees of freedom in power transfer, they fail to meet the requirements for different levels of degrees of freedom in practical applications and inevitably experience energy waste during power transfer. In order to address this issue, a new reconfigurable 3-D coil structure is proposed, capable of generating a locally omnidirectional magnetic field and achieving limited omnidirectional wireless power transmission. This coil adopts a nonoverlapping regular overall winding pattern, ensuring that each planar coil’s winding direction is different from that of adjacent planar coils, thereby enhancing the magnetic field between adjacent coils; moreover, the coil features reconfigurable properties, effectively enable the extension of degrees of freedom. By selecting different reconfiguration strategies, different levels of degrees of freedom can be generated, meeting the demands of various load conditions and reducing energy waste during power transfer. Experimental studies show that this system can achieve limited omnidirectional wireless power transmission and flexible extension of degrees of freedom, with an efficiency of 73%.