Patents by Inventor Yuan-Jui Fang

Yuan-Jui Fang 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).

  • High speed charging/discharging circuit having a capacitive element to provide a negative reference potential
    Patent number: 6576885
    Abstract: A charging/discharging circuit comprises a PNP transistor controlled by a diode, an NPN transistor arranged on a discharging path and controlled by at least one photodiode, and a capacitor arranged between a photodiode and the NPN transistor. During charging stage, a charging current flows through the diode to produce a voltage drop, which cuts off the transistors to prevent leakage current. The photodiode generates a photo current such that the capacitor presents a negative voltage on one contact thereof, which facilitates the discharging process.
    Type: Grant
    Filed: August 13, 2001
    Date of Patent: June 10, 2003
    Assignee: Opto Tech Corporation
    Inventor: Yuan-Jui Fang
  • Charging/discharging circuit with fast operation
    Publication number: 20030029990
    Abstract: A charging/discharging circuit comprises a PNP transistor controlled by a diode, an NPN transistor arranged on a discharging path and controlled by at least one photodiode, and a capacitor arranged between a photodiode and the NPN transistor. During charging stage, a charging current flows through the diode to produce a voltage drop, which cuts off the transistors to prevent leakage current. The photodiode generates a photo current such that the capacitor presents a negative voltage on one contact thereof, which facilitates the discharging process.
    Type: Application
    Filed: August 13, 2001
    Publication date: February 13, 2003
    Inventor: Yuan-Jui Fang