Patents by Inventor Yuka Sugata

Yuka Sugata 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).

  • Motor driving device for supplying driving current to a three-phase motor through output transistors
    Patent number: 6762576
    Abstract: A driving current flowing through a first output transistor is given to a stator coil of a three-phase motor (first operation), a driving current flowing through the stator coil is output to the ground through a second output transistor (second operation), and no current flows through the stator coil during the off-state of both the first and second output transistors (third operation). Charge remaining in a gate of the first output transistor is rapidly output to the ground through an n-channel transistor for a short time at both the end of the first operation and the start of the second operation. Charge of a high voltage remaining in the stator coil is output to the ground through a voltage clamp circuit as a clamp current during the first and second operations while controlling the clamp current to a low value in a constant current circuit.
    Type: Grant
    Filed: January 27, 2003
    Date of Patent: July 13, 2004
    Assignees: Renesas Technology Corp., Mitsubishi Electric Engineering Company Limited
    Inventors: Katsumi Miyazaki, Daisuke Suetsugu, Yuka Sugata
  • Motor driving device for supplying driving current to a three-phase motor through output transistors
    Publication number: 20040017168
    Abstract: A driving current flowing through a first output transistor is given to a stator coil of a three-phase motor (first operation), a driving current flowing through the stator coil is output to the ground through a second output transistor (second operation), and no current flows through the stator coil during the off-state of both the first and second output transistors (third operation). Charge remaining in a gate of the first output transistor is rapidly output to the ground through an n-channel transistor for a short time at both the end of the first operation and the start of the second operation. Charge of a high voltage remaining in the stator coil is output to the ground through a voltage clamp circuit as a clamp current during the first and second operations while controlling the clamp current to a low value in a constant current circuit.
    Type: Application
    Filed: January 27, 2003
    Publication date: January 29, 2004
    Applicants: Mitsubishi Denki Kabushiki Kaisha, Mitsubishi Electric Engineering Company Limited
    Inventors: Katsumi Miyazaki, Daisuke Suetsugu, Yuka Sugata