A Dual-Mode Continuously Scalable-Conversion-Ratio SC Energy Harvesting Interface With SC-Based PFM MPPT and Flying Capacitor Sharing Scheme

Kim, Hyun‐Jin; Maeng, Junyoung; Park, Inho; Jeon, Jong Up; Choi, Yohan; Kim, Chulwoo

doi:10.1109/jssc.2020.3048481

Cited by 22 publications

(8 citation statements)

References 38 publications

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“…Although many works on high PCE, dynamic range RCP have been reported, most of these designs exhibit optimal performance for a minimum input voltage, Vin ranging from 0.3V to 0.8V, which is less attractive compared to the conventional charge pump with fixed voltage conversion ratio in the context of cost and design complexity. The reported work with a minimum Vin of less than 0.3V [53,84] usually suffers from low PCE or requires an external voltage source, which is not favorable for miniaturized EH applications. The PCE degradation is mainly due to insufficient supply voltage for the transistor's operation and higher overall power consumption in RCP due to additional control circuits.…”

Section: Discussionmentioning

confidence: 99%

“…In general, the fsw tuning can be achieved by altering the clock signal generator / VCO supply voltage or the number of inverter stages as discussed in section II. Tuning the VCO supply voltage is considered a better approach as the number of inverter stages is usually fixed in the CP circuit [14,[84][85][86][87][88]. To achieve fine CR tuning and further improve the PCE in WDR input voltage, [14] proposed a twodimensional MPPT reconfigurable CP topology where the RCP can tune two variables i) number of active CP stage N and ii) switching frequency fsw by utilizing constant on time (COT) regulation as shown in Figure 14(a).…”

Section: Frequency Modulationmentioning

confidence: 99%

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Low Voltage Switched-Capacitive-Based Reconfigurable Charge Pumps for Energy Harvesting Systems: An Overview

Ramiah

Churchill

et al. 2022

IEEE Access

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Conventional SC-based charge pump with fixed conversion ratio is predominantly adopted in energy harvesting (EH) systems, which becomes a bottleneck for attaining high power conversion efficiency (PCE) with wide dynamic range (WDR). This article reviews and explores the SC-based reconfigurable charge pump (RCP) as an alternative voltage-boosting element for the EH system. An overview of the RCP structure is established, followed by a comprehensive review of CP reconfigurable topologies along with state-of-art architecture. Design consideration of the RCP in terms of dynamic range, PCE, and VCE is provided to give a clear insight into the future development of RCP architecture for the EH system.INDEX TERMS Energy harvesting (EH), reconfigurable charge pump, wide dynamic range, capacitivebased converter, dc-dc converter, CMOS

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Section: Discussionmentioning

confidence: 99%

Section: Frequency Modulationmentioning

confidence: 99%

Low Voltage Switched-Capacitive-Based Reconfigurable Charge Pumps for Energy Harvesting Systems: An Overview

Ramiah

Churchill

et al. 2022

IEEE Access

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“…A lot of work has also been done on very low power MPPT solutions for efficient energy harvesting from indoor photovoltaic devices as well as other low power energy sources. − Depending on target output voltage and power, power losses of between 15% and only 5% have been achieved while keeping the control circuit current consumption from below 0.1 mA to 0.13 μA.…”

Section: Introductionmentioning

confidence: 99%

Indoor Energy Harvesting With Perovskite Solar Cells for IoT Applications─A Full Year Monitoring Study

Pirc,

Ajdič,

Uršič

et al. 2024

ACS Appl. Energy Mater.

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Indoor photovoltaics (IPV) hold enormous market potential driven by the rising demand for perpetual energy sources to power various small electrical devices and especially Internet of things (IoT) devices. Perovskite solar cells (PSCs) offer exciting prospects for this role. This study sets out to deepen our knowledge of PSC performance under realistic indoor conditions. For this purpose, we designed an indoor monitoring system that maintains four solar cells at their maximum power points and simultaneously logs their performance and environmental conditions. Throughout a 12-month period, we monitored the behavior of three PSCs and one crystalline silicon solar cell (c-Si SC), all with an active area of approximately 1 cm 2 . Measured daily energy yields in conjunction with a comparative overview of minimum energy requirements of different wireless technologies indicate that a single 1 cm 2 PSC should be enough to power an IoT device with one of the available short-range, low-power wireless technologies on most days of the year, a fact confirmed by a prototype device. There are, however, a few days every year when the available energy would not be enough to even power the maximum power point tracking, highlighting the need for at least some energy storage capacity. Solar cell orientation dependence measurements demonstrated a 36% advantage for optimal orientation and a 72% performance drop for the worst orientation compared to horizontal orientation. A one-year energy yield results show a remarkable three-to-one advantage in favor of the best PSC (148.8 mWh/cm 2 ) over the c-Si SC (46.0 mWh/cm 2 ). The best of the three PSCs also retained most of its initial performance throughout the year with a simple edge-sealing encapsulation.

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“…Several PMSs using MPPT have been studied. [16][17][18][19][20][21][22][23][24] The hill climbing MPPT architecture is widely used to maximize the output power. [17][18][19][20][21] In the architecture, we have to compare the PV cell's operating voltage with the voltage at the MPP.…”

Section: Introductionmentioning

confidence: 99%

Fully-integrated switched-capacitor voltage boost converter with digital maximum power point tracking for low-voltage energy harvesting

Matsumoto¹,

Ikeda²,

Sebe³

et al. 2023

Jpn. J. Appl. Phys.

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This paper proposes a fully-integrated switched-capacitor (SC) voltage boost converter (VBC) with a digital maximum power point tracking (MPPT) control circuit for low-voltage and low-power energy harvesting. The proposed digital MPPT control circuit converts analog voltage information of a PV cell into digital values and extracts the maximum power regardless of the harvester conditions and load current. Measurement results demonstrated that our proposed circuit can track the maximum power point of a PV cell successfully. The maximum voltage conversion ratio of our circuit was 5.6. The proposed power management system (PMS) generated a 2.58-V output voltage from a 0.46-V input voltage. The maximum power conversion efficiency was 63.6%.

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A Dual-Mode Continuously Scalable-Conversion-Ratio SC Energy Harvesting Interface With SC-Based PFM MPPT and Flying Capacitor Sharing Scheme

Cited by 22 publications

References 38 publications

Low Voltage Switched-Capacitive-Based Reconfigurable Charge Pumps for Energy Harvesting Systems: An Overview

Low Voltage Switched-Capacitive-Based Reconfigurable Charge Pumps for Energy Harvesting Systems: An Overview

Indoor Energy Harvesting With Perovskite Solar Cells for IoT Applications─A Full Year Monitoring Study

Fully-integrated switched-capacitor voltage boost converter with digital maximum power point tracking for low-voltage energy harvesting

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