Yazar "Ishibashi, T." seçeneğine göre listele

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    Design of an Inductor-less Step-Down AC/AC Converter Combined with a Symmetrical-Type Converter and Ladder-Type Converters
    (Institute of Electrical and Electronics Engineers Inc., 2020) Eguchi, K.; Asadi, Farzin; Ishibashi, T.; Oota, I.
    In this paper, a new inductor-less step-down ac/ac converter is designed by using switched-capacitor (SC) techniques. Unlike existing inductor-less ac/ac converters, the proposed ac/ac converter consists of ladder-type converters nested in a symmetrical-type converter. In the proposed ac/ac converter, the $1/4\times$ voltage gain is achieved by converting an ac input twice by the symmetrical-type converter and the ladder-type converters. The proposed new topology enables to reach not only high power efficiency but also high input power factor. To evaluate the characteristics of the proposed ac/ac inverter realizing the $1/4\times$ voltage gain, we conducted theoretical analysis and simulation program with integrated circuit emphasis (SPICE) simulations. The SPICE simulation results demonstrated that the proposed ac/ac converter can achieve about 84% power efficiency and 0.88 input power factor when the output power is 200W. © 2020 IEEE.
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    Design of an LED sink driver using a switched-inductor and switched-capacitor buck-boost converter with high voltage gains
    (Institute of Electrical and Electronics Engineers Inc., 2020) Eguchi, K.; Shibata, A.; Asadi, Farzin; Ishibashi, T.; Harada, Y.; Oota, I.
    A novel light emitting diode (LED) sink driver using a switched-inductor and switched capacitor (SISC) buck-boost converter is proposed in this paper. The proposed LED driver can achieve a high voltage gain by cascading the SI buck-boost block and the SC doubler block with a flying capacitor. The proposed negative SISC topology can provide not only high voltage gain but also flexible controllability of LED currents. The performance of the proposed SISC buck-boost converter was clarified by simulation program with integrated circuit emphasis (SPICE) simulations. In the performed simulations, the proposed SISC buck-boost converter can improve power efficiency about 6% from the conventional hybrid buck-boost converter when the duty factor D is 0.5 and the output power is 500mW. Furthermore, the feasibility of the proposed SISC topology was confirmed by breadboard experiments. © 2020 IEEE.
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    A high voltage multiplier using stacked hybrid Cockcroft–Walton/Dickson multipliers
    (IOP Publishing Ltd, 2021) Eguchi, K.; Nakashima, D.; Ishibashi, T.; Asadi, Farzin
    A high voltage multiplier is one of the most important components for shockwave non-thermal food processing systems. In the design of the high voltage multiplier for shockwave non-thermal food processing systems, not only high voltage gain but also high speed operation and low voltage stress of circuit components are required. In this paper, a novel high voltage multiplier with stacked topology is proposed for shockwave non-thermal food processing systems. Unlike conventional high voltage multipliers, the proposed multiplier is designed by stacking hybrid Cockcroft-Walton/Dickson multipliers (HCWDMs). In the proposed multiplier, high speed operation is achieved, because the stacked topology can reduce the number of multiplier stages. Furthermore, voltage drop of higher multiplier stages and voltage stress are mitigated by the stacked topology using HCWDMs. The validity of the circuit design is confirmed by the laboratory experiments regarding the prototype of the shockwave non-thermal food processing system. The experimental results demonstrate that the proposed multiplier can generate about 3.9 kV within 113 s by converting the ac input 100 V at 60 Hz. © 2021 Institute of Physics Publishing. All rights reserved.