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access icon free Fully integrated ultra-low power management system for micro-power solar energy harvesting applications

Abstract

A fully integrated, area-efficient and ultra-low power management system for micro-power solar energy harvesting applications is proposed. This system harvests energy from miniaturised solar cells connected in series to charge a rechargeable microbattery. This circuit occupies less area compared to conventional inductive and switched-capacitor DC-DC converters, while achieving better efficiency during battery charging. Owing to very low power consumption of the circuit, efficiency remains high even under reduced light intensity. The proposed circuit was fabricated in a 0.18 µm CMOS process and occupies a core area of only 0.15 mm2 to charge a NiMH microbattery. The average power consumption of the whole power management system is less than 300 nW.

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      • K. Jungmoon , K. Jihwan , K. Chulwoo . A regulated charge pump with a low-power integrated optimum power point tracking algorithm for indoor solar energy harvesting. IEEE Trans. Circuits Syst. II: Analog. Digit Signal Process. , 12 , 802 - 806

Related content

content/journals/10.1049/el.2012.0315
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