TY - JOUR
T1 - A Single-Inductor Dual-Path Three-Switch Converter with Energy-Recycling Technique for Light Energy Harvesting
AU - Wang, Yi Hsiang
AU - Huang, Yi Wei
AU - Huang, Peng Chang
AU - Chen, Hsuan Ju
AU - Kuo, Tai Haur
PY - 2016/11
Y1 - 2016/11
N2 - This work proposes an energy-recycling (ER) technique for power management among a photovoltaic (PV) module, battery, and load in light energy harvesting systems. The ER technique delivers all harvested PV energy directly to the load with surplus energy recycled from the load to the battery, and can eliminate inductor-sharing power switches in single-inductor dual-input dual-output (SIDIDO) converters. Accordingly, the proposed dual-path 3-switch (2P3S) converter, which operates in discontinuous-conduction mode and regulates load voltage by constant-on-time pulse-skipping modulation, was developed. Under dynamic PV power PP and load power PL profiles, the 2P3S converter's advantageous applications are identified by comparing efficiencies of state-of-the-art SIDIDO converters. The overall efficiency under static PP and PL profiles and indirect-path efficiency under dynamic PP and PL profiles are maximized by optimizing switch sizes and on-time. The chip has three power switches and a controller employing low-power circuits, and is fabricated in 0.5 μm CMOS process with 0.5 mm2 active area. The measured controller current is 0.85 μA. Under static PP and PL profiles, for PP of 40 μW, efficiency is 80.7% to 95.0% for 0 μW to 20 mW load power. Compared with other state-of-the-arts, the 2P3S converter has the highest efficiency under static PP and PL profiles and higher efficiency with more PV energy directly consumed by the load under dynamic PP and PL profiles.
AB - This work proposes an energy-recycling (ER) technique for power management among a photovoltaic (PV) module, battery, and load in light energy harvesting systems. The ER technique delivers all harvested PV energy directly to the load with surplus energy recycled from the load to the battery, and can eliminate inductor-sharing power switches in single-inductor dual-input dual-output (SIDIDO) converters. Accordingly, the proposed dual-path 3-switch (2P3S) converter, which operates in discontinuous-conduction mode and regulates load voltage by constant-on-time pulse-skipping modulation, was developed. Under dynamic PV power PP and load power PL profiles, the 2P3S converter's advantageous applications are identified by comparing efficiencies of state-of-the-art SIDIDO converters. The overall efficiency under static PP and PL profiles and indirect-path efficiency under dynamic PP and PL profiles are maximized by optimizing switch sizes and on-time. The chip has three power switches and a controller employing low-power circuits, and is fabricated in 0.5 μm CMOS process with 0.5 mm2 active area. The measured controller current is 0.85 μA. Under static PP and PL profiles, for PP of 40 μW, efficiency is 80.7% to 95.0% for 0 μW to 20 mW load power. Compared with other state-of-the-arts, the 2P3S converter has the highest efficiency under static PP and PL profiles and higher efficiency with more PV energy directly consumed by the load under dynamic PP and PL profiles.
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U2 - 10.1109/JSSC.2016.2598222
DO - 10.1109/JSSC.2016.2598222
M3 - Article
AN - SCOPUS:85027417342
VL - 51
SP - 2716
EP - 2728
JO - IEEE Journal of Solid-State Circuits
JF - IEEE Journal of Solid-State Circuits
SN - 0018-9200
IS - 11
ER -