Yazar "Maruta, Hidenori" seçeneğine göre listele

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    Analysis of Sensorless Model Control DC-DC Converter in CCM
    (IEEE, 2016) Furukawa, Yudai; Watanabe, Shingo; Maruta, Hidenori; Matsui, Nobumasa; Colak, Lihami; Kurokawa, Fujio
    We have proposed the sensorless model control based on the static model equation of the dc-dc converter that is able to change the bias value corresponding to changes of the load current, the input voltage and output voltage. The sensorless model control can regulate the output voltage. On the other hand, the transient response of output voltage is not improved. Therefore, an improvement of the transient response is carried out by adding the transient improvement function which changes a bias value drastically for a short time at the start of the transient state. The purpose of this paper is to indicate the parameter setting of the transient improvement function that improves the transient response by the simulation analysis under changing the circuit condition.
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    Dynamic Characteristics Analysis of DC-DC Converter for Server Using Digital Current-Frequency Detector
    (IEEE, 2016) Furukawa, Yudai; Nibu, Shintaro; Maruta, Hidenori; FujioKurokawa; Hirose, Keiichi; Colak, Ilhami
    The purpose of this paper is to analyze the dynamic characteristics of proposed digital peak current mode dc-dc converter. The waveforms of the output voltage and the reactor current are derived by the small signal analysis. They are compared with simulation results assuming an actual large amplitude operation. It is confirmed that the tendency of the transient response is indicated based on the analysis results. The experimental result of the proposed method shows the validity of the proposed method and a gradual response is obtained by an improvement of the stability of dc-dc converter. Consequently, the proposed method can be a solution of implementing the peak current mode control in digital.
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    Dynamic characteristics of integral gain changeable digital control dc-dc converter for suppression of output capacitance
    (International Journal of Renewable Energy Research, 2016) Kajiwara, Kazuhiro; Tajima, Hidenobu; Maruta, Hidenori; Kurokawa, Fujio; Colak, Ilhami
    Stability of power converters has become more and more important in hybrid green energy systems because of its difficulties to maintain a stable dc-bus. This paper presents dynamic characteristics of a digital integral gain changeable control dc-dc converter to realize high stability with suppression of the output capacitance. The integral gain changeable control method uses a variable integral gain, which is changed by the value of load current. The stability analysis is conducted by Bode diagrams. It is shown that the transient response and stability of the integral gain changeable method are better than the conventional fixed integral gain control method even if the output capacitance is smaller than the conventional method. Simulation and experimental results show the effectiveness of our concept.
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    Dynamic Characteristics of Integral Gain Changeable Digital Control DC-DC Converter for Suppression of Output Capacitance
    (Int Journal Renewable Energy Research, 2016) Kajiwara, Kazuhiro; Tajima, Hidenobu; Maruta, Hidenori; Kurokawa, Fujio; Colak, Ilhami
    Stability of power converters has become more and more important in hybrid green energy systems because of its difficulties to maintain a stable dc-bus. This paper presents dynamic characteristics of a digital integral gain changeable control dc-dc converter to realize high stability with suppression of the output capacitance. The integral gain changeable control method uses a variable integral gain, which is changed by the value of load current. The stability analysis is conducted by Bode diagrams. It is shown that the transient response and stability of the integral gain changeable method are better than the conventional fixed integral gain control method even if the output capacitance is smaller than the conventional method. Simulation and experimental results show the effectiveness of our concept.
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    Improvement for Fast Response of Current Sensorless Model Control DC-DC Converter
    (IEEE, 345 E 47TH ST, NEW YORK, NY 10017 USA, 2016) Furukawa, Yudai; Maruta, Hidenori; Watanabe, Shingo; Kurokawa, Fujio; Matsui, Nobumasa; Çolak, İlhami
    The switching power supply is required the wide load range operation for the energy saving. In such a situation, the output voltage must be regulated. The model control is able to regulate the output voltage, because the bias value is varied depending on the static model equation. Thus, it is effective for switching power supply to implement the model control. The existing sensorless model cannot have a quick response. The purpose of this paper is to improve the transient response of the sensorless model control dc-dc converter by setting the parameter of the function that changes the operating point for a short time at the start of the transient state. It suppresses the undershoot of output voltage. The validity of the proposed method is confirmed by comparison with existing model control method and the proposed sensorless model method.