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.
Highlights
The latest development of low power consumption electronic device has contributed to a variety of energy smart wireless sensors
Radio power transmitters can be used as an energy source for developling radio frequency energy harvesting systems (RFEHS), especially in urban areas where the transmitted radio frequency (RF) power is widely available at any time
This paper presents a method for designing a complete power processing circuit for an indoor
Summary
The latest development of low power consumption electronic device has contributed to a variety of energy smart wireless sensors. Due to the complexity of the multi-band system and the power drop at various rectifier diodes and power processing circuits, the radio frequency-to-direct current (RF-to-DC) conversion efficiency is often lower than the single-band RFEHS. This research proposes a power processing circuit for a 2.45 GHz Wi-Fi indoor energy harvesting system which can accept the operational input power as low as −50 dBm. The proposed circuit acts as an extension of a successful research reported in [13] with reduced charging time of the storage device. At the end of this research, the power processing circuit will be tested in a practical environment to demonstrate its actual performance with all the components of the proposed RFEHS. 2. The Proposed Power Processing Circuit for the Radio Frequency Energy Harvesting
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