期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 26, 期 6, 页码 1620-1626出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2010.2096475
关键词
DC-DC; RF energy scavenging; ultralow power; resistor emulation
资金
- National Science Foundation, Arlington, VA [0722023]
- Colorado Power Electronics Center, Boulder
- Direct For Computer & Info Scie & Enginr
- Division Of Computer and Network Systems [0722023] Funding Source: National Science Foundation
This letter presents a custom IC that provides an efficient interface between an ultralow power RF rectifying antenna (rectenna) power source and a microbattery for maximum power scavenging. The energy scavenger IC operates a boost converter in pulsed fixed-frequency discontinuous conduction mode to present a positive resistance to the rectenna. It uses current-starved circuitry, a nonoverlapping gate drive, and a subthreshold current source to achieve a nominal supply current in the 200-nA range for V-DD = 2.5 V. Experimental results are given with the IC scavenging energy from a 1.93-GHz patch rectenna to a battery with voltages ranging from 2.5 to 4.15 V. Overall conversion efficiency including all control losses is demonstrated at over 35% at an input power of just 1.5 mu W and at over 70% at input power levels over 30 mu W. The IC is fabricated in a 5-V, 0.35-mu m CMOS process. Although the IC was designed for RF energy scavenging, the low-power boost converter can be applied to other power sources such as wind, vibration, and temperature.
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