Patents by Inventor Hitoshi Sado

Hitoshi Sado 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).

  • Protection circuit of drive system for motor
    Patent number: 5805396
    Abstract: A grounded terminal of a motor driver for controlling an actuator motor is connected to a ground terminal of a control unit through a grounded wire, and therefore connected to a grounded point. Since a ground wire of the stabilized power supply circuit is connected to the ground wire of the control unit, the stabilized power-supply circuit also has its ground connected with the grounded point disposed outside the control unit. A cut-wire avoidance diode is connected between the ground wire of the stabilized power supply circuit and a power transistor unit in a manner such that its cathode is connected to the power transistor unit, which enables the stabilized power-supply circuit to remain grounded even when the control unit is disconnected from the grounded point.
    Type: Grant
    Filed: September 20, 1996
    Date of Patent: September 8, 1998
    Assignee: Zexel Corporation
    Inventors: Hitoshi Sado, Hiroyo Saitoh