Adaptive Maximum Power Point Finding Using Direct V OC /2 Tracking Method With Microwatt Power Consumption for Energy Harvesting

Maximum power transfer occurs in many energy harvesters at their half open-circuit voltage (VOC /2). A novel implementation method of maximum power point finding based on the VOC /2 method is presented by exploiting the capacitor charging voltage across a smoothing capacitor connected in parallel wi...

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Vydáno v:IEEE transactions on power electronics Ročník 33; číslo 9; s. 8164 - 8173
Hlavní autoři: Chew, Zheng Jun, Zhu, Meiling
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 01.09.2018
Témata:
Capacitors
Converters
Energy
Energy conversion efficiency
Energy harvesting
Harvesters
High pass filters
Maximum power
Maximum power transfer
Open circuit voltage
Piezoelectricity
Power consumption
Power efficiency
Programmable controllers
Rectifiers
Smoothing
ISSN:0885-8993, 1941-0107
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Shrnutí:Maximum power transfer occurs in many energy harvesters at their half open-circuit voltage (VOC /2). A novel implementation method of maximum power point finding based on the VOC /2 method is presented by exploiting the capacitor charging voltage across a smoothing capacitor connected in parallel with the energy harvester. The presented technique has a specifically designed high-pass filter, which has a peak output voltage that corresponds to the VOC /2 of the energy harvester. The control circuit filters and differentiates the voltage across the smoothing capacitor to directly determine the timing of reaching the VOC /2 of the energy harvester without having to find the VOC first and is fully implemented using discrete analog components without the need of a programmable controller, leading to low power consumption of the method. In this paper, the control circuit is used in conjunction with a full-wave diode bridge rectifier and a dc-dc converter to harvest energy from a piezoelectric energy harvester (PEH) as the studied case. The PEH was subjected to various strain levels at low frequencies from 2 to 10 Hz. Experimental results show that the implemented circuit is adaptive to various vibration amplitudes and frequencies and has a maximum power point finding efficiency of up to 98.28% with power consumption as low as 5.16 μW.
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ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2017.2774102