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Article

Design of Switched-Capacitor DC-DC Voltage-Down Converters Driven by Highly Resistive Energy Transducer

Faculty of Engineering, Shizuoka University, Hamamatsu 432-8561, Japan
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Author to whom correspondence should be addressed.
Academic Editors: Shailendra Rajput, Moshe Averbukh and Noel Rodriguez
Electronics 2022, 11(12), 1874; https://doi.org/10.3390/electronics11121874
Received: 4 June 2022 / Revised: 11 June 2022 / Accepted: 13 June 2022 / Published: 14 June 2022
(This article belongs to the Special Issue Energy Harvesting and Energy Storage Systems, Volume II)
Electrostatic vibration energy transducers have a relatively high output impedance (RET) and open-circuit voltage (VIN), so that voltage-down conversion is required for sensor/RF ICs. Switched-capacitor converters are the best candidate to create small-form-factor technology and are a low-cost solution because of their capability to fully integrate into sensor/RF ICs. To design switched-capacitor voltage-down converters (SC-VDCs) with a minimum circuit area for electrostatic vibration energy transducers, two steps are required. The first step requires an optimum design of DC-DC SC-VDCs driven by high RET with a minimum circuit area, and the second step requires an optimum design of AC-DC SC-VDCs based on the first step, to minimize the converter circuit area. This paper discusses circuit analysis and design optimization aimed at the first step. Switching frequency, the number of stages and the capacitance per stage were determined as a function of RET, VIN and the output voltage (Vo) and current (Io) to the load, to achieve a minimum circuit area. The relationship between Io and the power conversion efficiency was studied as well. The performance was validated by SPICE simulation in 250 nm BCD technology. An optimum design flow was proposed to design DC-DC SC-VDCs driven by high RET with a minimum circuit area under conditions where RET, VIN, Vo and Io were given. The second design step remains as future work. View Full-Text
Keywords: switched-capacitor converter; voltage-down converter; energy transducer; optimum design; electrostatic vibration energy harvesting; fully integrated; IoT switched-capacitor converter; voltage-down converter; energy transducer; optimum design; electrostatic vibration energy harvesting; fully integrated; IoT
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MDPI and ACS Style

Demura, Y.; Tanzawa, T. Design of Switched-Capacitor DC-DC Voltage-Down Converters Driven by Highly Resistive Energy Transducer. Electronics 2022, 11, 1874. https://doi.org/10.3390/electronics11121874

AMA Style

Demura Y, Tanzawa T. Design of Switched-Capacitor DC-DC Voltage-Down Converters Driven by Highly Resistive Energy Transducer. Electronics. 2022; 11(12):1874. https://doi.org/10.3390/electronics11121874

Chicago/Turabian Style

Demura, Yosuke, and Toru Tanzawa. 2022. "Design of Switched-Capacitor DC-DC Voltage-Down Converters Driven by Highly Resistive Energy Transducer" Electronics 11, no. 12: 1874. https://doi.org/10.3390/electronics11121874

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