为实现微波无线能量传输(MWPT)系统中最高传输效率, 需要调节微波发射波束对准接收端。通过对微波发射端天线单元的相位进行闭环调节和控制, 实现接收端微波功率最大值的跟踪与锁定。本文构建2个发射天线单元的X波段微波无线能量传输系统, 基于LabWindows/CVI软件平台进行发射端功率放大器相位自适应控制, 实现系统最高效率传输。发射天线和接收天线的中心距离为152 cm, 功率放大器的最小移相步进5.625°。实测结果表明, 微波无线能量传输系统输出功率降为最大值一半的范围(3 dB动态范围)扩大了49%, 验证了本方法能准确地进行闭环自适应相位控制并锁定最高系统传输功率。

In order to realize the highest transmission efficiency in a Microwave Power Transmission (MWPT) system, microwave transmitting beam should be directed to the receiving end. Through a closed-loop regulation and control of phases of the microwave transmitting antenna unit, tracking and locking of the maximum receiving power is realized. In this paper, a microwave power transmission system with two units of X-band transmitting antennas is built and adaptively adjusting the phases at the transmitting end to achieve the highest efficiency is realized based on LabWindows/CVI platform. The center distance between the transmitting antenna and receiving antenna is 152 cm and the minimum phase shift step of power amplifier is 5.625°. Measured results show that the 3 dB dynamic range of the output power of the microwave wireless energy transmission system has been increased by 49%, and it controls the phase accurately and locks the highest system efficiency with an adaptive closed-loop.