Supplying the Power Requirements to a Sensor Network Using Radio Frequency Power Transfer

Sensors

Steven Percy¹  Chris Knight¹  Francis Cooray² 

[1] Commonwealth Industrial Research Organisation (CSIRO), P.O. Box 330, Newcastle, NSW 2300, Australia; E-Mail:;Commonwealth Scientific and Industrial Research Organisation (CSIRO), P.O. Box 76, Epping, NSW 1710, Australia; E-Mails:

关键词: radio;    supercapacitor;    wireless power;    track;    position;    energy scavenging;    energy transfer;    impedance matching;   

DOI  :  10.3390/s120708571

来源: mdpi

【 摘 要 】

Wireless power transmission is a method of supplying power to small electronic devices when there is no wired connection. One way to increase the range of these systems is to use a directional transmitting antenna, the problem with this approach is that power can only be transmitted through a narrow beam and directly forward, requiring the transmitter to always be aligned with the sensor node position. The work outlined in this article describes the design and testing of an autonomous radio frequency power transfer system that is capable of rotating the base transmitter to track the position of sensor nodes and transferring power to that sensor node. The system's base station monitors the node's energy levels and forms a charge queue to plan charging order and maintain energy levels of the nodes. Results show a radio frequency harvesting circuit with a measured S11 value of −31.5 dB and a conversion efficiency of 39.1%. Simulation and experimentation verified the level of power transfer and efficiency. The results of this work show a small network of three nodes with different storage types powered by a central base node.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.