Title :
A 1-mW Solar-Energy-Harvesting Circuit Using an Adaptive MPPT With a SAR and a Counter
Author :
Hoonki Kim ; Young-Jae Min ; Chan-Hui Jeong ; Kyu-Young Kim ; Chulwoo Kim ; Soo-won Kim
Author_Institution :
Dept. of Electr. Eng., Korea Univ., Seoul, South Korea
Abstract :
This brief presents an energy-harvesting system that uses an adaptive maximum power point tracking (MPPT) circuit for 1-mW solar-powered wireless sensor networks. The proposed MPPT circuit exploits a successive approximation register and a counter to solve the tradeoff problem between a fast transient response and a small steady-state oscillation with low-power consumption. The proposed energy-harvesting circuit is fabricated using a 0.35-μm CMOS process. The MPPT circuit reduces the transient response time by 76.6%, dissipates only 110 μW , and shows MPPT efficiency of 99.6%.
Keywords :
CMOS digital integrated circuits; counting circuits; energy harvesting; maximum power point trackers; solar cells; transient response; wireless sensor networks; CMOS process; SAR; adaptive MPPT; adaptive maximum power point tracking circuit; counter; low power consumption; power 1 mW; power 110 muW; size 0.35 mum; solar energy-harvesting circuit; solar-powered wireless sensor network; steady-state oscillation; transient response; Energy harvesting; maximum power point tracking (MPPT); solar cell; wireless sensor network (WSN);
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2013.2258262
