Abstract
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.
Highlights
In recent years, wireless sensor node (WSN) technology has developed rapidly and is widely used in environmental monitoring [1,2,3,4,5]
hybrid energy harvesting (HEH) systems are currently used in large-scale energy collection; related characteristics of forest microenergy, we developed a low-power HEH system with automatic research about microenergy collection applied to forests is rare
The feasibility of characteristics of forest microenergy, we developed a low-power HEH system with automatic selection this HEH system to collect microenergy and stabilize WSNs was verified
Summary
Wireless sensor node (WSN) technology has developed rapidly and is widely used in environmental monitoring [1,2,3,4,5]. Snyman and air and soil can be collected by a thermoelectric generator (TEG) to generate electricity for WSNs. Enslin [10] designed a photovoltaic system that collects photovoltaic energy to power WSNs. Photovoltaic energy is one of the most widely used types of environmental energy. Hybrid energy harvesting (HEH) systems have received considerable attention due provide stable power supply for WSNs. to their high conversion efficiency. HEH systems are currently used in large-scale energy collection; related characteristics of forest microenergy, we developed a low-power HEH system with automatic research about microenergy collection applied to forests is rare. Of on/off circuit functions and analyzed the power loss of each circuit part The feasibility of this HEH system to collect microenergy and stabilize WSNs was verified
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