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Design and experimental evaluation on an advanced multisource energy harvesting system for wireless sensor nodes
Hao Li1, Gaofei Zhang1, Rui Ma1
1Collaborative Innovation Center for Micro/Nano Fabrication, Device and System, State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China.
This study presents an effective multisource energy harvesting system for wireless sensor nodes (WSNs). The system efficiently manages power and harvests solar and vibration energy, offering a long-term continuous power supply.
Area of Science:
- Electrical Engineering
- Energy Harvesting
- Wireless Sensor Networks
Background:
- Wireless Sensor Nodes (WSNs) require reliable and sustainable power sources.
- Traditional power supplies for WSNs often face limitations in longevity and environmental adaptability.
- Efficient energy harvesting is crucial for the autonomous operation of WSNs.
Purpose of the Study:
- To develop an effective multisource energy harvesting system for wireless sensor nodes (WSNs).
- To integrate advanced power management and energy harvesting techniques for low power consumption.
- To ensure a long-term, continuous power supply for WSNs using ambient energy.
Main Methods:
- Implementation of an expandable power management module with lithium polymer battery charge/discharge control.
- Utilization of a maximum power point tracking (MPPT) circuit with an analog driving scheme for solar and vibration energy harvesting.
- Integration of a supercapacitor to mitigate battery current fluctuations and an analog switch for automatic power path selection.
Main Results:
- The developed system achieves low power consumption through MPPT and power management.
- A supercapacitor effectively reduces current fluctuations during battery operations.
- The system automatically switches power supply paths based on ambient energy and load demands.
- Efficiency of the energy harvesting system reached 75-85% in a 24-hour environmental test.
Conclusions:
- The proposed multisource energy harvesting system provides an effective and continuous power supply for WSNs.
- The integration of MPPT, power management, supercapacitor, and automatic switching enhances system efficiency and reliability.
- The system demonstrates practical viability for long-term WSN deployment.
