A Hybrid Microenergy Storage System for Power Supply of Forest Wireless Sensor Nodes
Key Laboratory of State Forestry and Grassland Administration on Forestry Equipment and Automation, School of Technology, Beijing Forestry University, Beijing 100083, China
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Electronics 2019, 8(12), 1409; https://doi.org/10.3390/electronics8121409
Received: 21 October 2019 / Revised: 13 November 2019 / Accepted: 22 November 2019 / Published: 26 November 2019
(This article belongs to the Special Issue Energy Efficient Circuit Design Techniques for Low Power Systems)
Wireless sensor nodes (WSNs) are widely used in the field of environmental detection; however, they face serious power supply problems caused by the complexity of the environmental layout. In this study, a new ultra-low-power hybrid energy harvesting (HEH) system for two types of microenergy collection (photovoltaic (PV) and soil-temperature-difference thermoelectric (TE)) was designed to provide stable power to WSNs. The power supply capabilities of two microenergy sources were assessed by analyzing the electrical characteristics and performing continuous energy data collection. The HEH system consisted of two separated power converters and an electronic multiplexer circuit to avoid impedance mismatch and improve efficiency. The feasibility of the self-powered HEH system was verified by consumption analysis of the HEH system, the WSNs, and the data analysis of the collected microenergy. Taking the summation of PV and TEG input power of 1.26 mW (PPV:PTEG was about 3:1) as an example, the power loss of the HEH system accounted for 33.8% of the total input power. Furthermore, the ratio decreased as the value of the input power increased.
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Keywords:
hybrid energy harvesting; wireless sensor nodes; ultra-low-power circuit; soil-temperature-difference thermoelectric; photovoltaic
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MDPI and ACS Style
Wang, H.; Li, W.; Xu, D.; Kan, J. A Hybrid Microenergy Storage System for Power Supply of Forest Wireless Sensor Nodes. Electronics 2019, 8, 1409.
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