An RF Energy Harvester With 44.1% PCE at Input Available Power of-12 dBm

作者：Hsieh Ping Hsuan^*; Chou Chih Hsien; Chiang Tao

来源：IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS, 2015, 62(6): 1528-1537.

DOI：10.1109/TCSI.2015.2418834

• DC-DC boost converter
• energy harvesting
• full-bridge differential rectifier
• passively powered device
• power conversion efficiency
• radio-frequency energy harvesting
• remotely powered device
• wireless sensor network
• wireless sensor node

A 900-MHz radio-frequency energy harvester is designed and implemented for remotely powered devices. An efficient power path structure with adaptive control is proposed to maintain close-to-optimal power conversion efficiency. The control circuit consumes low power by adopting a novel open-loop asynchronous implementation and duty-cycled operation. A startup circuit is also presented. Measurement results show minimum input available power for startup of -17 dBm. With input available power of -12 dBm and load resistance of 144 k Omega, the measured output power is 27.8 mu W, giving an output voltage of 2 V. This corresponds to an end-to-end power conversion efficiency of 44.1%. The harvester consumes quiescent current of 1.56 mu A at output voltage of 2 V.

• 出版日期2015-6
• 单位清华大学; 中国科学院电工研究所