Switched Capacitors Charge Pump with half-floating Topology for a high-efficient Solar Energy Harvester

Lopez-Gasso, Alberto; Beriain, Andoni; Solar, Héctor; Berenguer, Roc

doi:10.1109/dcis51330.2020.9268631

Cited by 2 publications

(3 citation statements)

References 10 publications

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“…In this work, we present a self-sustaining energy-efficient monolithic PMU that includes a charge pump adapted to photovoltaic cells with the capability of charging a large supply capacitor and managing the stored energy efficiently to provide the required supply voltage and power to low energy consumption wireless sensor nodes such an RFID sensor tag. Previous works developed by the authors in [ 15 ] proved and validated the architecture of the charge pump with simulations. This paper continues the previous design by adding on-chip all the necessary blocks, implementing it for fabrication in silicon on the TSMC 180 nm technology and the post-characterization of the energy harvester.…”

Section: Introductionmentioning

confidence: 99%

Power Management Unit for Solar Energy Harvester Assisted Batteryless Wireless Sensor Node

Lopez-Gasso

Beriain

Solar

et al. 2022

Sensors

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This work describes an energy-efficient monolithic Power Management Unit (PMU) that includes a charge pump adapted to photovoltaic cells with the capability of charging a large supply capacitor and managing the stored energy efficiently to provide the required supply voltage and power to low energy consumption wireless sensor nodes such as RFID sensor tags. The proposed system starts-up self-sufficiently with a light source luminosity equal to or higher than 500 lux using only a 1.42 cm2 solar cell and integrating an energy monitor that gives the ability to supply autonomous sensor nodes with discontinuous operation modes. The system occupies an area of 0.97 mm2 with a standard 180 nm CMOS technology. The half-floating architecture avoids losses of charging the top/button plate of the stray capacitors in each clock cycle. Measurements’ results on a fabricated IC exhibit an efficiency above 60% delivering 13.14 μW over 1.8 V. The harvested energy is enough to reach the communication range of a standard UHF RFID sensor tag up to 21 m.

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Section: Introductionmentioning

confidence: 99%

Power Management Unit for Solar Energy Harvester Assisted Batteryless Wireless Sensor Node

Lopez-Gasso

Beriain

Solar

et al. 2022

Sensors

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“…The selected solar cells KXOB25-05X3F and AM-1456 are compared after the outdoor test under the same illumination [15]. The key values are extracted to Table 4.8, although the full performance graphs can be found in Figures A.1 and A.2 in Appendix A.…”

Section: Solar Cellsmentioning

confidence: 99%

“…On the other hand, even though they have similar active area (143 mm 2 and 156.78 mm 2 KXOB25-05X3F and AM1456 respectively), the Ixys solar cell is more compact in dimensions with only 184 mm 2 versus 250 mm 2 from the AM1456 (Table 4.2). Table 4.8: Solar cell power performance comparison between Amorton AM1456 and IXYS KXOB25-05X3F from [15].…”

Section: Solar Cellsmentioning

confidence: 99%

Development of a low-power solar energy harvester PMU integrated circuit optimized for indoor environments.

Lopez-Gassó

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Wireless electronic devices face a common and important constraint: the limited lifespan of their batteries. The concept of quasi-perpetual electronic devices, particularly for tiny and low-power electronic systems, is progressively becoming attainable. En-ergy harvesting can be the part of the solution by improving, attenuating or even eliminating this limitation by extending its autonomy. The ﬁnal goal is to convert them into a virtually perpetual system. Energy Harvesting can be deﬁned as the collection and storage of ambi-ent energy from the surroundings, to later convert it into electrical energy and use it to power a small and low-power electronic devices. These devices are often. The energy harvesting technique is intended to be used in devices where it is impractical or inconvenient to use traditional battery or grid power sources. Moreover, it have recently received more attention due to its in-creasing use in the Internet of Things (IoT) and the appearing of Wireless Sensor Networks (WSN). This work describes an energy-eﬃcient monolithic Power Management Unit (PMU) that includes a charge pump adapted to photovoltaic cells with the capability of charging a large supply capacitor and managing the stored energy eﬃciently to provide the required supply voltage and power to low energy consumption wireless sensor nodes such as RFID sensor tags. The proposed system starts-up self-suﬃciently with a light source lumi-nosity equal to or higher than 245 lux, meaning a voltage input of 595 mV using only a 1.42 cm2 solar cell. The result energy harvester integrates an energy monitor that gives the ability to supply autonomous sensor nodes with discontinuous operation modes. The full PMU occupies an area of 1.073 mm2 using a standard 180 nm CMOS technology. The half-ﬂoating architecture of the integrated charge pump avoids losses of charging the top/button plate of the stray capacitors in each clock cycle. Measurements’ results on a fabricated IC exhibit an an output power of 13.9 µW with 70.2 percent of peak-to-peak eﬃciency at indoor light conditions (680lux) with an output voltage of 2V.

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Switched Capacitors Charge Pump with half-floating Topology for a high-efficient Solar Energy Harvester

Cited by 2 publications

References 10 publications

Power Management Unit for Solar Energy Harvester Assisted Batteryless Wireless Sensor Node

Power Management Unit for Solar Energy Harvester Assisted Batteryless Wireless Sensor Node

Development of a low-power solar energy harvester PMU integrated circuit optimized for indoor environments.

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