Patents by Inventor Shoutaro Shindo

Shoutaro Shindo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Phase shift inverter, X-ray high-voltage device using same, X-ray CT device, and X-ray imaging device
    Patent number: 8588371
    Abstract: An inverter circuit allowing a single drive circuit to perform both tracking control for tracking resonance frequency fluctuations caused by load fluctuations, and power control, thereby reducing switching loss. An inverter drive circuit part obtains a phase difference between output current and output voltage directed to a load circuit connected to a midpoint of two arm circuits of the inverter circuit, and controls a phase of the driving signal directed to each semiconductor switch such that the phase difference becomes zero or a predetermined value, enabling an operating frequency of the inverter circuit part to track a resonance frequency of the load circuit, and enabling a current phase to be delayed with respect to a voltage phase, thereby achieving ZCS. Since the phase difference is used, an auxiliary circuit is not necessary for measuring a current value in proximity to the semiconductor switches.
    Type: Grant
    Filed: November 5, 2009
    Date of Patent: November 19, 2013
    Assignees: Hitachi Medical Corporation, Institute of National College of Technology, National University Cooperation Nagaoka University of Technology
    Inventors: Mina Ogawa, Itaru Ando, Kiyoshi Ohishi, Shoutaro Shindo
  • PHASE SHIFT INVERTER, X-RAY HIGH-VOLTAGE DEVICE USING SAME, X-RAY CT DEVICE, AND X-RAY IMAGING DEVICE
    Publication number: 20110222651
    Abstract: There is provided an inverter circuit which allows a single drive circuit to carry out both the tracking control for tracking resonance frequency fluctuations caused by load fluctuations, and the power control, thereby reducing switching loss. An inverter drive circuit part obtains a phase difference between output current and output voltage directed to a load circuit which is connected to a midpoint of two arm circuits of the inverter circuit, and controls a phase of the driving signal directed to each of the semiconductor switches in such a manner that the phase difference becomes zero or a predetermined value. This allows an operating frequency of the inverter circuit part to track a resonance frequency of the load circuit. In addition, this enables a current phase to be delayed with respect to a voltage phase, thereby achieving ZCS.
    Type: Application
    Filed: November 5, 2009
    Publication date: September 15, 2011
    Applicants: HITACHI MEDICAL CORPORATION, Institute of National Colleges of Technology, Japan, National University Corporation Nagaoka University of Technology
    Inventors: Mina Ogawa, Itaru Ando, Kiyoshi Ohishi, Shoutaro Shindo