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Appl. Sci. 2017, 7(8), 827; doi:10.3390/app7080827

A Power Processing Circuit for Indoor Wi-Fi Energy Harvesting for Ultra-Low Power Wireless Sensors

1
Faculty of Electrical Engineering, Universiti Teknologi Mara, Shah Alam 40450, Malaysia
2
Electrical and Computer Engineering Department, the University of Auckland, Auckland 1010, New Zealand
*
Authors to whom correspondence should be addressed.
Received: 13 July 2017 / Revised: 6 August 2017 / Accepted: 7 August 2017 / Published: 11 August 2017
(This article belongs to the Special Issue Smart Home and Energy Management Systems)
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Abstract

This article proposes a complete power processing circuit for an indoor 2.45 GHz Wi-Fi energy harvesting system. The proposed power processing circuit works by using power harvested from indoor Wi-Fi transmitters. The overall system of this work is simplified as an equivalent circuit and analyzed mathematically. A two-port network is analyzed in formulating the relevant equations of the equivalent circuit. The importance of matching the impedance of a harvesting antenna to the rectifier circuit is highlighted by using simulation analysis, and it is shown that the impedance matching for both components has satisfied the conditions for a high sensitivity circuit and radio frequency-to-direct current (RF-to-DC) power conversion. Actual experiments showed that the proposed power processing circuit could operate with an incident power as low as −50 dBm. It has been found that the proposed harvesting system stored 0.11 J in a 200 mF supercapacitor as the storage device in 20 hours of the experimentation periods. Moreover, actual results for the overall energy harvesting system is compared with previous research, and it has been found that the proposed system has advantages over the listed works. View Full-Text
Keywords: alternating current-direct current (AC-DC) converter; power conversion; energy storage; radio frequency; Wi-Fi; rectenna alternating current-direct current (AC-DC) converter; power conversion; energy storage; radio frequency; Wi-Fi; rectenna
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MDPI and ACS Style

Kadir, E.A.; Hu, A.P. A Power Processing Circuit for Indoor Wi-Fi Energy Harvesting for Ultra-Low Power Wireless Sensors. Appl. Sci. 2017, 7, 827.

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