Title | ||
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A Thermal/RF Hybrid Energy Harvesting System With Rectifying-Combination and Improved Fractional-OCV MPPT Method |
Abstract | ||
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This paper presents a thermal/RF hybrid energy harvester. The energy harvesting system can scavenge energy from a thermoelectric generator (TEG) and a radio-frequency (RF) energy source simultaneously, and deliver the combined power to a single load. Two techniques are employed in the system to increase the end-to-end efficiency; the rectifying-combination technique is proposed to eliminate the power loss associated with a dedicated AC-DC converter before the combiner and an improved fractional open-circuit voltage (FOCV) maximum power tracking (MPPT) is considered for a high average efficiency. A dynamic power path control extracts the maximum RF power from a cross-coupled differential rectifier, and also behaves as an AC/DC energy combiner. The thermal/RF harvester system achieves a measured peak end-to-end power conversion efficiency (PCE) of 63.4%. The shorter sampling time of 26ms every 16s for the proposed FOCV MPPT method reduces the long charging tail required to refresh the sampling capacitor, resulting in a an improved average efficiency of 82.2% for the thermal harvester. Fabricated in 0.18
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CMOS technology, the prototype operates at a thermal input voltage ranging from 40 mV to 400 mV and an RF power from −18 dBm to −3 dBm and delivers an output voltage of 1.8 V. The total area of the fabricated circuit prototype is 1.22 mm
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Year | DOI | Venue |
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2020 | 10.1109/TCSI.2020.2982403 | IEEE Transactions on Circuits and Systems I: Regular Papers |
Keywords | DocType | Volume |
Energy harvesting,Radio frequency,Capacitors,Maximum power point trackers,Transducers,Switches,Voltage control | Journal | 67 |
Issue | ISSN | Citations |
10 | 1549-8328 | 3 |
PageRank | References | Authors |
0.41 | 0 | 3 |
Name | Order | Citations | PageRank |
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Zemin Liu | 1 | 64 | 12.71 |
Yu-Pin Hsu | 2 | 5 | 2.13 |
Mona Mostafa Hella | 3 | 68 | 14.51 |