A 5μW-5mW input power range, 0-3.5V output voltage range RF energy harvester is designed to charge super-capacitors for RFID applications. Voltage protection techniques are used to improve the peak output voltage from 2.5V to 3.5V resulting in a 100% increase in stored energy. An all analog low power maximum power point tracking (MPPT) controller with an embedded power estimator increases the maximum tracking speed by 8x, improves the input power range by 8x, and accumulates 35% more energy during charging transients. The chip is fabricated in TSMC's 65nm GP process, occupies an area of 0.15mm2, and has a measured peak efficiency of 91%.
|Original language||English (US)|
|Title of host publication||2018 IEEE Custom Integrated Circuits Conference, CICC 2018|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Number of pages||4|
|State||Published - May 9 2018|
|Event||2018 IEEE Custom Integrated Circuits Conference, CICC 2018 - San Diego, United States|
Duration: Apr 8 2018 → Apr 11 2018
|Name||2018 IEEE Custom Integrated Circuits Conference, CICC 2018|
|Other||2018 IEEE Custom Integrated Circuits Conference, CICC 2018|
|Period||4/8/18 → 4/11/18|
Bibliographical noteFunding Information:
V. CONCLUSIONS This paper describes an inductive buck-boost DC-DC converter with an adaptive MPPT controller for energy harvesting. A built-in power estimator adapts the MPPT frequency and sampling capacitors with the input power level. This improves the input power range to 1000x, reduces the track time by 8x and improves transient efficiency. Voltage protection techniques extend the maximum output voltage to 3.5V (in a 65nm CMOS GP process), resulting in a 100% increase in the stored energy. The circuit has a peak conversion efficiency of 91%, and an MPPT efficiency of 98.7%. Acknowledgements: Research supported by US Army TATRC.
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