Patents by Inventor Nag-Sig Choi

Nag-Sig Choi 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).

  • Driver circuit apparatus for driving a three-phase motor with a single magneto-sensitive device
    Patent number: 5852349
    Abstract: An integrated circuit for driving a three-phase motor in response to a single signal of the three-phase signals to be applied to stator coils of the motor. The circuit comprises a first amplifier for amplifying the single signal on the basis of a first inverse phase signal, which is a 180.degree. phase-shifted signal relative to the single signal, and outputting a first amplified phase signal. A first phase shifter receives the first phase signal and generates a second phase signal in response to the first phase signal, the second phase signal having a phase difference of 120.degree. relative to the first phase signal. A second phase shifter receives the first inverse phase signal and generates a second inverse phase signal in response to the first inverse phase signal, the second inverse phase signal having a phase difference of 120.degree. relative to the first inverse phase signal.
    Type: Grant
    Filed: October 25, 1996
    Date of Patent: December 22, 1998
    Assignee: Samsung Electronic, Co., Ltd.
    Inventor: Nag-Sig Choi