A Switched Capacitor Multiple Input Single Output Energy Harvester (Solar + Piezo) Achieving 74.6% Efficiency With Simultaneous MPPT

Devaraj, Abhishekh; Megahed, M.; Liu, Yutao; Ramachandran, Ashwin; Anand, Tejasvi

doi:10.1109/tcsi.2019.2934985

Cited by 27 publications

(15 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to highlight the important features of the proposed wireless power transfer concept, the developed CP-based DC-DC converter was compared to other state-of-the-art works ( Table 1 ), where the results obtained from measurement under typical conditions are presented. From Table 1 , one can observe that the developed DC-DC converter is able to work with the similar input voltage values as reported in other works, except for designs presented in [ 40 , 41 , 42 , 43 , 44 ]. On the other hand, in our work, the converter was designed for ultra-low voltage ICs; therefore, the output voltage was much lower than 1 V. The maximum peak current of 38 µA was achieved for the input voltage of 0.2 V. If the input voltage increased, the output current of more than 100 µA can be reached.…”

Section: Discussionsupporting

confidence: 65%

“…On the other hand, in our work, the converter was designed for ultra-low voltage ICs; therefore, the output voltage was much lower than 1 V. The maximum peak current of 38 µA was achieved for the input voltage of 0.2 V. If the input voltage increased, the output current of more than 100 µA can be reached. The power conversion efficiency of the proposed converter is better than the one reported in the state-of-the art works, except for [ 40 , 41 , 45 ]. However, the converters presented in [ 40 , 41 ] are designed for higher values of the output voltage.…”

Section: Discussionmentioning

confidence: 68%

“…The power conversion efficiency of the proposed converter is better than the one reported in the state-of-the art works, except for [ 40 , 41 , 45 ]. However, the converters presented in [ 40 , 41 ] are designed for higher values of the output voltage. Finally, it is important to underline that the proposed topology achieves the best efficiency compared to the works without any MPPT algorithm [ 24 , 44 , 46 , 47 , 48 ].…”

Section: Discussionmentioning

confidence: 68%

See 2 more Smart Citations

Low-Voltage DC-DC Converter for IoT and On-Chip Energy Harvester Applications

Potocny¹,

Kovac²,

Arbet³

et al. 2021

Sensors

View full text Add to dashboard Cite

The power saving issue and clean energy harvesting for wireless and cost-affordable electronics (e.g., IoT applications, sensor nodes or medical implants), have recently become attractive research topics. With this in mind, the paper addresses one of the most important parts of the energy conversion system chain – the power management unit. The core of such a unit will be formed by an inductorless, low-voltage DC-DC converter based on the cross-coupled dynamic-threshold charge pump topology. The charge pump utilizes a power-efficient ON/OFF regulation feedback loop, specially designed for strict low-voltage start-up conditions by a driver booster. Taken together, they serve as the masters to control the charge pump output (up to 600 mV), depending on the voltage value produced by a renewable energy source available in the environment. The low-power feature is also ensured by a careful design of the hysteresis-based bulk-driven comparator and fully integrated switched-capacitor voltage divider, omitting the static power consumption. The presented converter can also employ the on-chip RF-based energy harvester for use in a wireless power transfer system.

show abstract

Section: Discussionsupporting

confidence: 65%

Section: Discussionmentioning

confidence: 68%

Section: Discussionmentioning

confidence: 68%

See 1 more Smart Citation

Low-Voltage DC-DC Converter for IoT and On-Chip Energy Harvester Applications

Potocny¹,

Kovac²,

Arbet³

et al. 2021

Sensors

View full text Add to dashboard Cite

show abstract

“…Unlike N and Vclk tuning which preserves the original CP circuit connection, Ceff tuning directly reconfigurable the circuit network by actively changing the charge transfer path to achieve different CR [30,64,97,102]. Compared to N tuning which suffers from low CR resolution, or Vclk tuning which requires a power-consuming boosting circuit, Ceff tuning features more flexibility in terms of CR tuning and offers a lower start-up requirement.…”

Section: Discussionmentioning

confidence: 99%

“…In an EH system, a step-up CP is responsible to boost up the low DC input voltage harvested from the EH transducer to a sufficiently high output DC voltage for load usage. Occasionally, step-down, or fractional CP [29,30] has also been implemented in the EH system to generate a fractional CR for higher configurable resolution.…”

Section: Rcp Model / Architecture a Charge Pumpmentioning

confidence: 99%

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

Ramiah

Churchill

et al. 2022

IEEE Access

View full text Add to dashboard Cite

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

show abstract

Efficient Power Coupling in Directly Connected Photovoltaic‐Battery Module

et al. 2022

View full text Add to dashboard Cite

The natural temporal mismatch between solar electricity generation and consumption necessitates the use of energy storage to stabilize "green" electricity supply. Integration of photovoltaic (PV) devices with energy storage has been widely discussed for different operation scenarios from large-scale installations to low-power indoor devices. At the same time, various energy storage technologies from batteries [1][2][3][4][5][6][7][8][9][10][11] and supercapacitors [11][12][13] to energy storage by water splitting [14][15][16] and water pumping [17] can be used. Any combination of PV and suggested energy storage technologies requires power coupling. To utilize the full power generation potential of a PV module, it must operate at the maximum power point (MPP) of its currentvoltage (I-V ) curve. The shape of the I-V curve and position of the MPP depend on the technology and PV module design and strongly depend on irradiance [18] and temperature, [19] which are both constantly changing in real-world applications. At the same time, the combined I-V curve of the devices connected to the PV module plays an equally important role. This I-V changes with variance of consumption rate and battery state of charge (SoC). Power coupling under these variable conditions is usually achieved using maximum power point trackers (MPPTs)-devices combining DC-DC converter capability with MPPT logic. [20][21][22][23][24][25][26][27][28][29] It provides dynamic power coupling-matching of the current characteristic resistance of the battery to the input resistance of energy storage and load. This approach ensures flexibility in component selection as well as stability under variable conditions. On the other hand, adding an MPPT means additional cost, power overhead due to self-consumption, reduced reliability, and increased maintenance efforts for a PV system.In contrast, a direct PV-to-battery connection can be a simple and cost-effective alternative. Even though there is no active MPP tracking in this simplified case, the concept is of interest because the domain of the battery operating points and the domain of MPPs of a PV module can overlap very closely. [30,31] The feasibility of direct power matching was previously investigated. [1,5,[30][31][32][33][34][35][36][37] Although a directly coupled solution requires careful preselection of the PV and battery components, [1,5,33,34,[37][38][39][40] the PV-battery device can potentially achieve high coupling factor over a significant range of irradiance

show abstract

A Switched Capacitor Multiple Input Single Output Energy Harvester (Solar + Piezo) Achieving 74.6% Efficiency With Simultaneous MPPT

Cited by 27 publications

References 25 publications

Low-Voltage DC-DC Converter for IoT and On-Chip Energy Harvester Applications

Low-Voltage DC-DC Converter for IoT and On-Chip Energy Harvester Applications

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

Efficient Power Coupling in Directly Connected Photovoltaic‐Battery Module

Contact Info

Product

Resources

About