Title: 120% Harvesting Energy Improvement by Maximum Power Extracting Control for High Sustainability Magnetic Power Monitoring and Harvesting System
Authors: Huang, Tzu-Chi
Du, Ming-Jhe
Kang, Yu-Chai
Peng, Ruei-Hong
Chen, Ke-Horng
Lin, Ying-Hsi
Tsai, Tsung-Yen
Lee, Chao-Cheng
Chen, Long-Der
Chen, Jui-Lung
Institute of Electrical and Control Engineering
Keywords: Charger;current transformer (CT);energy harvesting;low power;magnetic energy;maximum power point tracking (MPPT)
Issue Date: 1-Apr-2015
Abstract: The magnetic energy harvesting (MEH) circuit and the power monitoring system are proposed in this paper to enlarge the system sustainability on wireless sensing or the monitoring system. The proposed MEH circuit harvests magnetic power on power wires through a power sensing current transformer (CT) and charges power monitoring system. The MEH circuit includes the direct ac-dc rectifier and the maximum power extracting (MPE) control circuit. The direct ac-dc rectifier can directly rectify ac input to the dc output current. The proposed MPE control fits the characteristic of magnetic energy source compared to the conventional resistor emulation maximum power point tracking method. Owing to continuous tracking the maximum power of the CT, 120% harvesting power improvement can be achieved under the same CT\'s sensing current. Peak efficiency of 82% can be achieved under the sensing current of 8 A. The test chip is fabricated in 0.25 mu m CMOS process with an active area of 0.98 mm(2).
URI: http://dx.doi.org/10.1109/TPEL.2014.2330868
ISSN: 0885-8993
DOI: 10.1109/TPEL.2014.2330868
Volume: 30
Begin Page: 2262
End Page: 2274
Appears in Collections:Articles