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Yositsugu Okamura - One of the best experts on this subject based on the ideXlab platform.

  • variable frequency inverter with sinusoidal voltage outputs using rotating coordinate transformation
    Electrical Engineering in Japan, 1997
    Co-Authors: Hirotami Nakano, Masayuki Jibiki, Akira Nabae, Yositsugu Okamura
    Abstract:

    An ideal inverter should have sinusoidal voltage and current outputs. Generally, output voltages of a voltage-source PWM inverter contain High-level switching frequency harmonies due to the PWM operation, while output currents are kept nearly sinusoidal. High-level harmonics contained in output voltages of a voltage-source inverter cause acoustic noises, iron losses and electromagnetic interferences. An LC Filter was used to suppress the switching frequency harmonics; however, there is a danger of resonance in the LC Filter. Accordingly, to remove harmonics of the LC Filter resonance frequency, the authors add a voltage feedback loop. A conventional system can operate without difficulty within 50 Hz. However, with accompanying increases in the output frequency, output voltages are largely delayed and reduced by a High-Pass Filter inserted in the feedback loop. These problems are caused by a High-Pass Filter inserted in the feedback loop. Accompanied by the inverter output frequency, a High-Pass Filter cannot remove the fundamental component perfectly. As a result, a small fundamental component is fed back, which causes a delay and decrease in output voltage. This paper proposes the application of coordinate transformation to a High-Pass Filter inserted in the feedback loop. As a result, the proposed system realizes an ideal Filter which can suppress fundamental frequency components perfectly, and improves the characteristics of the inverter with sinusoidal voltage outputs greatly. Theoretical analyses, simulations and experiments showed satisfactory results. © 1997 Scripta Technica, Inc. Electr Eng Jpn, 118 (4): 94–102, 1997

  • variable frequency inverter with sinusoidal voltage outputs using rotating coordinate transformation
    Ieej Transactions on Industry Applications, 1995
    Co-Authors: Hirotami Nakano, Masayuki Jibiki, Akira Nabae, Yositsugu Okamura
    Abstract:

    An ideal inverter should have sinusoidal voltage and current outputs. Generally, output voltages of a voltage-source PWM inverter contain High level switching frequency harmonics due to the PWM operation, while output currents are kept nearly sinusoidal. High level harmonics contained in output voltages of a voltage-source inverter cause acoustic noises, iron losses and electromagnetic interferences. An L-C Filter was used to suppress the switching frequency harmonics; however, there is reason to fear resonance in the L-C Filter. Accordingly, in order to remove harmonics of the L-C Filter resonance frequency, the authors add a voltage feed-back loop.A conventional system can operate without difficulty within 50Hz. However, with accompanying increases of the output frequency, output voltages are largely delayed and reduced by a High-Pass Filter inserted in the feed-back loop. These problems are caused by a High-Pass Filter inserted in the feed-back loop. Accompanied by the inverter output frequency, a High-Pass Filter can not remove the fundamental component perfectly. As the result, a small fundamental component is fed back, which causes a delay and decrease of output voltage.In this paper, the authors propose to apply coordinate transformation to a High-Pass Filter inserted in the feed-back loop. As a result, the proposed system has realized the ideal Filter which can suppress fundamental frequency components perfectly, and characteristics of the inverter with sinusoidal voltage outputs are greatly improved. And theoretical analysis, simulations and experiments showed satisfactory results.

  • A novel control strategy of the inverter with sinusoidal voltage and current outputs
    Proceedings of 1994 Power Electronics Specialist Conference - PESC'94, 1
    Co-Authors: Akira Nabae, Hirotami Nakano, Yositsugu Okamura
    Abstract:

    The authors have previously proposed a novel inverter with sinusoidal, voltage and current outputs (1992). In the novel inverter, the design of a High-Pass Filter inserted in the feedback circuit largely influences the output waveforms. In this paper, the authors show a solution to the design problem of the High-Pass Filter, applying a rotating coordinate transformation. >

Bocheng Bao - One of the best experts on this subject based on the ideXlab platform.

  • Inductor-free multi-stable Chua’s circuit constructed by improved PI-type memristor emulator and active Sallen–Key High-Pass Filter
    European Physical Journal-special Topics, 2019
    Co-Authors: Luo Jiaoyan, Mo Chen, Han Bao, Bocheng Bao
    Abstract:

    Based on an improved proportion-integral-type (PI-type) memristor emulator and an active Sallen–Key High-Pass Filter (HPF), a new memristive Chua’s circuit with inductor-free implementation is presented in this paper. The memristive Chua’s circuit possesses a line equilibrium state with unstable and stable region distributions, leading to the emergence of multi-stable patterns, i.e., the coexistence of multiple attractors for different initial values. With the normalized mathematical model, local basins of attraction, bifurcation plots and phase plane plots are numerically simulated, from which the initial values-related bifurcation behaviors are demonstrated and coexisting multiple attractors are obtained in the presented memristive Chua’s circuit. Finally, circuit simulations by PSIM software are performed and the results verify the numerical plots.

  • inductor free multi stable chua s circuit constructed by improved pi type memristor emulator and active sallen key High Pass Filter
    European Physical Journal-special Topics, 2019
    Co-Authors: Jiaoyan Luo, Mo Chen, Han Bao, Bocheng Bao
    Abstract:

    Based on an improved proportion-integral-type (PI-type) memristor emulator and an active Sallen–Key High-Pass Filter (HPF), a new memristive Chua’s circuit with inductor-free implementation is presented in this paper. The memristive Chua’s circuit possesses a line equilibrium state with unstable and stable region distributions, leading to the emergence of multi-stable patterns, i.e., the coexistence of multiple attractors for different initial values. With the normalized mathematical model, local basins of attraction, bifurcation plots and phase plane plots are numerically simulated, from which the initial values-related bifurcation behaviors are demonstrated and coexisting multiple attractors are obtained in the presented memristive Chua’s circuit. Finally, circuit simulations by PSIM software are performed and the results verify the numerical plots.

Luca Dellanna - One of the best experts on this subject based on the ideXlab platform.

  • The High-Pass Filter Hypothesis for Autism Spectrum Disorder (ASD)
    2018
    Co-Authors: Luca Dellanna
    Abstract:

    This paper proposes that one of the underlying causes of Autism Spectrum Disorder is the presence of a High-Pass Filter Effect applied to cognitive perception. Such an effect causes an enhancement of local details at the expense of global patterns. In particular, the High-Pass Filter Effect induces a disadvantage pertaining to mastering contextual fields (fields in which local features are noisy and information is distributed in adjacent perceptual pieces and in the relationship between them; for instance, interpersonal communication). Furthermore, in some cases, the High-Pass Filter Effect produces an advantage with respect to mastering detailed fields (fields in which information is intrinsic in modular, precise pieces of information; for example, computer science).In this paper, the High-Pass Filter Effect is explained, two secondary effects are described, (Peripheral Functionality Blindness and Prioritization by Specificity), and then a few examples of the way in which these effects induce the symptoms of Autism Spectrum Disorder are reported.

  • The Columnar Hypothesis for the High-Pass Filter Effect in Autism Spectrum Disorder (ASD)
    2018
    Co-Authors: Luca Dellanna
    Abstract:

    It has been suggested that one of the underlying causes of Autism Spectrum Disorder (ASD) is the presence of a High-Pass Filter Effect applied to cognitive perception (DellAnna, 2018a). Such an effect leads to an enhancement of local details at the expense of global patterns. This paper proposes a possible cause for the High-Pass Filter Effect, which is increased columnar density.It is already known that brains of people affected with ASD tend to have denser cortical column fields (Casanova, Buxhoeveden, Switala, & Roy, 2002). This paper, however, explains the way in which denser cortical columns fields lead to sharper, narrower categorizations in the intermediate perceptual areas of the cortex, which in turn induce the High-Pass Filter Effect and, consequently, most of the symptoms characteristic of ASD.

Hirotami Nakano - One of the best experts on this subject based on the ideXlab platform.

  • variable frequency inverter with sinusoidal voltage outputs using rotating coordinate transformation
    Electrical Engineering in Japan, 1997
    Co-Authors: Hirotami Nakano, Masayuki Jibiki, Akira Nabae, Yositsugu Okamura
    Abstract:

    An ideal inverter should have sinusoidal voltage and current outputs. Generally, output voltages of a voltage-source PWM inverter contain High-level switching frequency harmonies due to the PWM operation, while output currents are kept nearly sinusoidal. High-level harmonics contained in output voltages of a voltage-source inverter cause acoustic noises, iron losses and electromagnetic interferences. An LC Filter was used to suppress the switching frequency harmonics; however, there is a danger of resonance in the LC Filter. Accordingly, to remove harmonics of the LC Filter resonance frequency, the authors add a voltage feedback loop. A conventional system can operate without difficulty within 50 Hz. However, with accompanying increases in the output frequency, output voltages are largely delayed and reduced by a High-Pass Filter inserted in the feedback loop. These problems are caused by a High-Pass Filter inserted in the feedback loop. Accompanied by the inverter output frequency, a High-Pass Filter cannot remove the fundamental component perfectly. As a result, a small fundamental component is fed back, which causes a delay and decrease in output voltage. This paper proposes the application of coordinate transformation to a High-Pass Filter inserted in the feedback loop. As a result, the proposed system realizes an ideal Filter which can suppress fundamental frequency components perfectly, and improves the characteristics of the inverter with sinusoidal voltage outputs greatly. Theoretical analyses, simulations and experiments showed satisfactory results. © 1997 Scripta Technica, Inc. Electr Eng Jpn, 118 (4): 94–102, 1997

  • variable frequency inverter with sinusoidal voltage outputs using rotating coordinate transformation
    Ieej Transactions on Industry Applications, 1995
    Co-Authors: Hirotami Nakano, Masayuki Jibiki, Akira Nabae, Yositsugu Okamura
    Abstract:

    An ideal inverter should have sinusoidal voltage and current outputs. Generally, output voltages of a voltage-source PWM inverter contain High level switching frequency harmonics due to the PWM operation, while output currents are kept nearly sinusoidal. High level harmonics contained in output voltages of a voltage-source inverter cause acoustic noises, iron losses and electromagnetic interferences. An L-C Filter was used to suppress the switching frequency harmonics; however, there is reason to fear resonance in the L-C Filter. Accordingly, in order to remove harmonics of the L-C Filter resonance frequency, the authors add a voltage feed-back loop.A conventional system can operate without difficulty within 50Hz. However, with accompanying increases of the output frequency, output voltages are largely delayed and reduced by a High-Pass Filter inserted in the feed-back loop. These problems are caused by a High-Pass Filter inserted in the feed-back loop. Accompanied by the inverter output frequency, a High-Pass Filter can not remove the fundamental component perfectly. As the result, a small fundamental component is fed back, which causes a delay and decrease of output voltage.In this paper, the authors propose to apply coordinate transformation to a High-Pass Filter inserted in the feed-back loop. As a result, the proposed system has realized the ideal Filter which can suppress fundamental frequency components perfectly, and characteristics of the inverter with sinusoidal voltage outputs are greatly improved. And theoretical analysis, simulations and experiments showed satisfactory results.

  • A novel control strategy of the inverter with sinusoidal voltage and current outputs
    Proceedings of 1994 Power Electronics Specialist Conference - PESC'94, 1
    Co-Authors: Akira Nabae, Hirotami Nakano, Yositsugu Okamura
    Abstract:

    The authors have previously proposed a novel inverter with sinusoidal, voltage and current outputs (1992). In the novel inverter, the design of a High-Pass Filter inserted in the feedback circuit largely influences the output waveforms. In this paper, the authors show a solution to the design problem of the High-Pass Filter, applying a rotating coordinate transformation. >

Sheldon Schultz - One of the best experts on this subject based on the ideXlab platform.

  • Terahertz plasmonic High Pass Filter
    Applied Physics Letters, 2003
    Co-Authors: Nicholas X. Fang, Cheng Sun, Xiang Zhang, Willie J. Padilla, Dimitri Basov, David R. Smith, Sheldon Schultz
    Abstract:

    Metamaterials, which contain engineered subwavelength microstructures, can be designed to have positive or negative e and μ at desired frequencies. In this letter, we demonstrate a metamaterial which has a “plasmonic” response to electromagnetic waves in the terahertz (THz) range. The sharp change of reflection and transmission at this plasma frequency makes the structure a High Pass Filter. The reflection response is characterized by Fourier transform infrared spectroscopy, and a plasma frequency at 0.7 THz is observed, which agrees with the theoretical calculation. The metamaterial is a two-dimensional cubic lattice consisting of thin metal wires, having wire diameter of 30 μm, lattice constant of 120 μm, and wire length of 1 mm. The microstereolithography technique is employed to fabricate the High-aspect-ratio lattice.