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Supplying the power requirements to a sensor network using radio frequency power transfer
Steven Percy1, Chris Knight, Francis Cooray
1Commonwealth Industrial Research Organisation (CSIRO), P.O. Box 330, Newcastle, NSW 2300, Australia. steven.percy@csiro.au
Sensors (Basel, Switzerland)
|September 27, 2012
Summary
This study presents an autonomous radio frequency power transfer system that tracks sensor nodes for efficient wireless charging. The system ensures continuous power for multiple devices, improving wireless power transmission range and reliability.
Area of Science:
- Electrical Engineering
- Wireless Communication
- Robotics
Background:
- Wireless power transmission enables charging without physical connections.
- Directional antennas increase range but require precise alignment.
- Maintaining power for multiple sensor nodes is challenging.
Purpose of the Study:
- To design and test an autonomous radio frequency power transfer system.
- To enable a base transmitter to track and power remote sensor nodes.
- To manage power distribution and charging order for a network of nodes.
Main Methods:
- Developed an autonomous system with a rotating base transmitter.
- Implemented a base station to monitor node energy levels and manage a charging queue.
- Designed and tested a radio frequency harvesting circuit.
Main Results:
- Achieved a radio frequency harvesting circuit with S11 of -31.5 dB.
- Demonstrated a conversion efficiency of 39.1% for power transfer.
- Successfully powered a network of three sensor nodes with different storage types.
Conclusions:
- The autonomous system effectively tracks and powers sensor nodes.
- The developed system enhances wireless power transfer capabilities.
- This technology supports efficient power management in multi-node networks.
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