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

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

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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.

References

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      • Chen, G., Ghaed, H., Haque, R.: `A cubic-millimeter energy-autonomous wireless intraocular pressure monitor', ISSCC, February 2011, San Francisco, CA, USA, p. 310–312.
    2. 2)
      • Qiu, Y., Liempd, C.V., Veld, B.O.H., Blanken, P.G., Hoof, C.V.: `5µW-to-10mW input power range inductive boost converter for indoor photovoltaic energy harvesting with integrated maximum power point tracking algorithm', ISSCC, February 2011, San Francisco, CA, USA, p. 118–120.
    3. 3)
      • 1 onward link is available for this reference.
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    4. 4)
      • 1 onward link is available for this reference.
      • CrossRef
    5. 5)
      • 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

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content/journals/10.1049/el.2012.0315
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