Analytical Study of Multi-stage Switched-Capacitor Voltage Boost Converter for Ultra-low Voltage Energy Harvesting

Nakazawa, Yasuhiro; Hirose, Takahisa; Ozaki, Toshihiro; Tsuji, Yuto; Kanzaki, Shuto; Asano, Hitoshi; Kuroki, Nobutaka; Numa, Masahiro

doi:10.1109/iscas.2018.8351466

Cited by 6 publications

(4 citation statements)

References 19 publications

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“…This causes the output voltage to reduce and degrades the power conversion efficiency (PCE). A complementary circuit configuration is often adopted to cope with this problem [31]- [34]. Figure 3 (a) shows a schematic of the complementary circuit configuration including a load capacitor C L .…”

Section: Switched-capacitor Vbcmentioning

confidence: 99%

Design of Switched-Capacitor Voltage Boost Converter for Low-Voltage and Low-Power Energy Harvesting Systems

Hirose

Nakazawa

2020

IEICE Trans. Electron.

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This paper discusses and elaborates an analytical model of a multi-stage switched-capacitor (SC) voltage boost converter (VBC) for low-voltage and low-power energy harvesting systems, because the output impedance of the VBC, which is derived from the analytical model, plays an important role in the VBC's performance. In our proposed method, we focus on currents flowing into input and output terminals of each stage and model the VBCs using switching frequency f , charge transfer capacitance C F , load capacitance C L , and process dependent parasitic capacitance's parameter k. A comparison between simulated and calculated results showed that our model can estimate the output impedance of the VBC accurately. Our model is useful for comparing the relative merits of different types of multi-stage SC VBCs. Moreover, we demonstrate the performance of a prototype SC VBC and energy harvesting system using the SC VBC to show the effectiveness and feasibility of our proposed design guideline.

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Section: Switched-capacitor Vbcmentioning

confidence: 99%

Design of Switched-Capacitor Voltage Boost Converter for Low-Voltage and Low-Power Energy Harvesting Systems

Hirose

Nakazawa

2020

IEICE Trans. Electron.

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“…Thermoelectric generators (TEGs) can generate electric energy from a subtle temperature difference, and therefore they can be used as energy sources for wearable electronics applications. However, it is quite difficult to operate them stably because the output voltages of the TEGs are too low for LSI systems [12][13][14][15][16][17][18][19][20][21][22][23][24]. Therefore, a power management system (PMS) that can operate with an extremely low-voltage input is strongly required.…”

Section: Introductionmentioning

confidence: 99%

A 35-mV supply ring oscillator consisting of stacked body bias inverters for extremely low-voltage LSIs

Nishi

Matsumoto

Kuroki

et al. 2021

IEICE Electron. Express

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This paper proposes a ring oscillator (ROSC) for extremely low-voltage LSI applications. The ROSC consists of dedicated low-voltage stacked body bias inverters (SBBIs) that are based on the conventional selfbias inverter (SBI) and stacked inverter (SI). The proposed SBBI employs the advantages of both SBI and SI to oscillate at extremely low supply voltage. The voltage gain of the proposed SBBI is improved by controlling main inverter's supply (DD and Gnd) and body-bias voltages, by using stacked and feedback inverters. The novelty of our proposed SBBI is in the combination of the conventional low-voltage circuit design techniques and its demonstration at extremely low supply voltage. Simulated and measured results in a 0.18-m CMOS process with deep n-well option demonstrated that the proposed ROSC can operate at extremely low supply voltage of 35 mV and generate a clock with a 88% voltage swing from an input supply voltage of 50 mV. To the best of the authors' knowledge, this is the lowest supply voltage CMOS ring oscillator ever reported.

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“…To address this issue, DC-DC converters are used to generate a sufficiently higher voltage. [25][26][27][28][29][30][31][32][33][34][35] As a first step in the realization of such converters, an extremely low voltage oscillator is required to start the PMS. [32][33][34][35][36][37][38][39] A ring oscillator (ROSC) consisting of CMOS inverters is widely used because it can operate at lower supply voltages.…”

Section: Introductionmentioning

confidence: 99%

A 42 mV startup ring oscillator using gain-enhanced self-bias inverters for extremely low voltage energy harvesting

Matsuzuka

Terada

Matsumoto

et al. 2020

Jpn. J. Appl. Phys.

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Analytical Study of Multi-stage Switched-Capacitor Voltage Boost Converter for Ultra-low Voltage Energy Harvesting

Cited by 6 publications

References 19 publications

Design of Switched-Capacitor Voltage Boost Converter for Low-Voltage and Low-Power Energy Harvesting Systems

Design of Switched-Capacitor Voltage Boost Converter for Low-Voltage and Low-Power Energy Harvesting Systems

A 35-mV supply ring oscillator consisting of stacked body bias inverters for extremely low-voltage LSIs

A 42 mV startup ring oscillator using gain-enhanced self-bias inverters for extremely low voltage energy harvesting

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