21.4 A >78%-efficient light harvester over 100-to-100klux with reconfigurable PV-cell network and MPPT circuit.
2016 IEEE International Solid-State Circuits Conference (ISSCC)(2016)
摘要
Energy harvesting is an attractive solution to extend system lifetime for internet of everything (IoE) nodes. Ambient light is a common energy source that can be harvested by photovoltaic (PV) cells. However, light intensity varies widely depending on location, ranging from ~10s of lux in dim indoor conditions to ~100klux under direct sunlight. Designing a fully integrated light harvester that spans such a wide range of light intensity with high efficiency is challenging, especially since typically low PV cell voltage requires a high upconversion ratio and PV-cell voltage/current characteristics change significantly with light intensity. Boost DC-DC converters are a typical energy-harvesting solution with high conversion efficiency, but they require a large off-chip inductor and hence cannot be fully integrated, increasing system size [1-3]. Recently, switched-capacitor (SC) DC-DC converters have been actively researched to enable fully-integrated energy harvesting using on-chip capacitors [4-6]. However, their efficiency has typically been limited to the 40-to-55% range at low input power levels (≤1μW) due to conduction/switching losses.
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关键词
efficient light harvester,reconfigurable PV-Cell network,MPPT Circuit,Internet of Everything node,IoE node,photovoltaic cells,light intensity,dim indoor,direct sunlight,high upconversion ratio,PV-cell voltage-current characteristics,off-chip inductor,switched-capacitor DC-DC boost converter,SC DC-DC converter,fully-integrated energy harvesting,on-chip capacitor,conduction-switching loss
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