Abstract
An energy-harvesting interface that incorporates a continuously scalable-conversion-ratio (CSCR) switched-capacitor (SC) dc-dc converter with maximum power point tracking (MPPT) is introduced in this paper. By exploiting unique characteristics of a CSCR SC converter, an MPPT based on the hill climbing algorithm is implemented with a real-Time power monitoring scheme with a frequency-mapped sampling capacitor DAC, allowing variation-Tolerant MPPT for various types of energy sources. The harvestable voltage range is significantly extended by a step-up/down convertible CSCR SC converter, and the voltage conversion efficiency is further improved with matrix-structured and load-mapped power switches. With the test chip fabricated in 28nm FDSOI technology, the proposed energy harvesting interface shows peak conversion efficiency of 89% and average efficiency of > 80% for 60-2, 794μ textW. MPPT efficiency of > 97 % is confirmed with energy harvesting measurement with a solar cell.
| Original language | English |
|---|---|
| Pages (from-to) | 1820-1831 |
| Number of pages | 12 |
| Journal | IEEE Transactions on Circuits and Systems I: Regular Papers |
| Volume | 69 |
| Issue number | 4 |
| DOIs | |
| State | Published - 1 Apr 2022 |
| Externally published | Yes |
UN SDGs
This output contributes to the following UN Sustainable Development Goals (SDGs)
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SDG 7 Affordable and Clean Energy
Keywords
- Continuously scalable-conversion-ratio (CSCR)
- Energy harvesting
- Maximum power point tracking (MPPT)
- Step-up/down converter
- Switched capacitor (SC) dc-dc converter
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