A solar battery charger with maximum power point tracking

Pastre, Marc; Krummenacher, F.; Kazanç, Onur; Pour, Naser Khosro; Pace, Catherine; Rigert, Stefan; Kayal, Maher

doi:10.1109/icecs.2011.6122296

Cited by 11 publications

(10 citation statements)

References 4 publications

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“…As these blocks are used for both PMU and SIU, they are always active. In addition, a frequency-proportional 100nA BM current reference [10] is used for sensor interface circuit that is turned off when no sensing is in progress.…”

Section: System Architecturementioning

confidence: 99%

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A miniaturized autonomous microsystem for hydrogen gas sensing applications

Pour

Krummenacher

Kayal

2012

10th IEEE International NEWCAS Conference

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This paper presents a fully integrated, ultra-low power microsystem that is used for hydrogen gas sensing in an autonomous wireless sensor node. The proposed circuit harvests solar energy from a micro-power photovoltaic module to measure temperature and hydrogen concentration and transmits the measured value using wireless data transmission. A rechargeable NiMH microbattery is used to store harvested energy. Photovoltaic module charges this microbattery, using a highly area-and power-efficient power management circuit. In order to measure hydrogen concentration, conductance change of a miniaturized palladium nanowire sensor is measured and converted to a digital signal with 12-bit resolution, using an area-efficient readout circuit. The proposed microsystem has been implemented in a 0.18µm CMOS process and occupies a core area of only 0.47mm 2 . This circuit features a low current consumption of 200nA for power management circuit and an additional 1.1µA for sensor interface circuit. It operates with low power supply voltage in the 0.8V to 1.6V range.

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Section: System Architecturementioning

confidence: 99%

“…Table 1 presents die area and simulated maximum power consumption of these common blocks. A current-starved ring oscillator [10] was used to generate 1MHz clock frequency. A fixed 10nA beta-multiplier (BM) current reference was used to bias the power management circuit.…”

Section: System Architecturementioning

confidence: 99%

A miniaturized autonomous microsystem for hydrogen gas sensing applications

Pour

Krummenacher

Kayal

2012

10th IEEE International NEWCAS Conference

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“…A current-starved ring oscillator [5] has been used to generate 50 KHz clock frequency and a fixed 10nA betamultiplier (BM) current reference has been used to provide required bias current for battery charger and LD blocks. As these circuits are always active, they have been designed as ULP circuits working in weak inversion to minimize their average power consumption.…”

Section: Common Blocksmentioning

confidence: 99%

An ultra-low power li-ion battery charger for micro-power solar energy harvesting applications

Pour

Facchin

Krummenacher

et al. 2012

2012 19th IEEE International Conference on Electronics, Circuits, and Systems (ICECS 2012)

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This paper presents an ultra-low power, fully integrated solar energy harvester circuit for autonomous microsystems. The proposed circuit harvests solar energy from a micro-power photovoltaic module and stores the harvested energy in a miniaturized thin film Li-Ion microbattery, using a highly area-and power-efficient power management circuit. As neither inductor, nor large pumping capacitors have been used in this circuit, it occupies less area comparing to conventional inductive and switched-capacitor DC-DC converters. In addition, thanks to low power design of this circuit, it achieves more than 94% efficiency during battery charging. Even under reduced light intensity, when the harvested energy is only a few tens of microwatts, more than 92% efficiency is achievable. The proposed microsystem has been implemented in a 0.18µm CMOS process and occupies a core area of only 0.12mm 2 . This circuit features a low power consumption of 270nW in average.

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“…If V bat is not high enough, these blocks are activated with a lower duty cycle to minimize average power consumption. The power consumption and speed of digital circuits are reduced by reconfiguring the frequency in the used current-starved oscillator [41]. At the same time, in ultra-low power analog circuits, such as the discrete time incremental ADC that has been used for sensor interfacing, bias currents should be high enough to guarantee correct operation at the target clock frequency.…”

Section: Energy Harvesting and Power Managementmentioning

confidence: 99%

“…When reducing the clock frequency the bias currents in the sensor interface circuit are scaled down dynamically to further reduce the power consumption of analog circuits. A switched-capacitor beta-multiplier (SCBM) current source that generates frequency-proportional bias currents is used for this purpose [41]. In addition, a fixed 10 nA beta-multiplier (BM) current reference provides the required bias currents for clock generation and LD blocks.…”

Section: Energy Harvesting and Power Managementmentioning

confidence: 99%

A miniaturised autonomous sensor based on nanowire materials platform: the SiNAPS mote

et al. 2013

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Author(s)Koshro Pour, Naser; Kayal, M.; Jia, G. is set up to detect hydrogen gas concentration in the low ppm range and over a broad temperature range using a low power sensing interface circuit. Using Telran TZ1053 radio to send one sample measurement of both temperature and H 2 concentration every 15 seconds, the average and active power consumption for the SiNAPS mote are less than 350nW and 2.1 µW respectively. Low-power miniaturised chemical sensors of liquid analytes through microfluidic delivery to silicon nanowires are also presented. These components demonstrate the potential of further miniaturization and application of sensor nodes beyond the typical physical sensors, and are enabled by the nanowire materials platform.

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A solar battery charger with maximum power point tracking

Cited by 11 publications

References 4 publications

A miniaturized autonomous microsystem for hydrogen gas sensing applications

A miniaturized autonomous microsystem for hydrogen gas sensing applications

An ultra-low power li-ion battery charger for micro-power solar energy harvesting applications

A miniaturised autonomous sensor based on nanowire materials platform: the SiNAPS mote

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