Energy-Adaptive Buffering for Efficient, Responsive, and Persistent Batteryless Systems
| dc.contributor.author | Williams, Harrison | en |
| dc.contributor.author | Hicks, Matthew | en |
| dc.date.accessioned | 2024-05-02T12:35:09Z | en |
| dc.date.available | 2024-05-02T12:35:09Z | en |
| dc.date.issued | 2024-04-27 | en |
| dc.date.updated | 2024-05-01T07:49:11Z | en |
| dc.description.abstract | Batteryless energy harvesting systems enable a wide array of new sensing, computation, and communication platforms untethered by power delivery or battery maintenance demands. Energy harvesters charge a buffer capacitor from an unreliable environmental source until enough energy is stored to guarantee a burst of operation despite changes in power input. Current platforms use a fixed-size buffer chosen at design time to meet constraints on charge time or application longevity, but static energy buffers are a poor fit for the highly volatile power sources found in real-world deployments: fixed buffers waste energy both as heat when they reach capacity during a power surplus and as leakage when they fail to charge the system during a power deficit. To maximize batteryless system performance in the face of highly dynamic input power, we propose REACT: a responsive buffering circuit which varies total capacitance according to net input power. REACT uses a variable capacitor bank to expand capacitance to capture incoming energy during a power surplus and reconfigures internal capacitors to reclaim additional energy from each capacitor as power input falls. Compared to fixed-capacity systems, REACT captures more energy, maximizes usable energy, and efficiently decouples system voltage from stored chargeāenabling low-power and high-performance designs previously limited by ambient power. Our evaluation on real-world platforms shows that REACT eliminates the tradeoff between responsiveness, efficiency, and longevity, increasing the energy available for useful work by an average 25.6% over static buffers optimized for reactivity and capacity, improving event responsiveness by an average 7.7š„ without sacrificing capacity, and enabling programmer directed longevity guarantees. | en |
| dc.description.version | Published version | en |
| dc.format.mimetype | application/pdf | en |
| dc.identifier.doi | https://doi.org/10.1145/3620666.3651370 | en |
| dc.identifier.uri | https://hdl.handle.net/10919/118733 | en |
| dc.language.iso | en | en |
| dc.publisher | ACM | en |
| dc.rights | Creative Commons Attribution 4.0 International | en |
| dc.rights.holder | The author(s) | en |
| dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | en |
| dc.title | Energy-Adaptive Buffering for Efficient, Responsive, and Persistent Batteryless Systems | en |
| dc.type | Article - Refereed | en |
| dc.type.dcmitype | Text | en |