Patents by Inventor Duong Cong Le

Duong Cong Le 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).

  • Power factor correction autodetect
    Patent number: 9178413
    Abstract: A power supply system includes an Offline Total Power Management Integrated Circuit (OTPMIC). The OTPMIC controls a Power Factor Correction (PFC) converter, a main AC/DC converter, and a standby AC/DC converter. A PFC Autodetect circuit in the OTPMIC monitors current flow in the PFC converter. If a high power condition is detected, then the PFC Autodetect circuit enables the PFC converter. The high power condition may be a voltage drop across a current sense resistor of a predetermined voltage for a predetermined time, within one half period of the incoming AC supply voltage. If a low power condition is detected, then the PFC Autodetect circuit disables the PFC converter. The PFC Autodetect circuit stores an IMON value that determines the predetermined voltage, and a TMON value that determines the predetermined time. The IMON and TMON values are loaded into the Autodetect circuit across an optocoupler link of the standby converter.
    Type: Grant
    Filed: November 19, 2013
    Date of Patent: November 3, 2015
    Assignee: Active-Semi, Inc.
    Inventors: Steven Huynh, Hue Khac Trinh, Khanh Quang Dinh, Duong Cong Le, Degang Xia
  • POWER FACTOR CORRECTION AUTODETECT
    Publication number: 20150138856
    Abstract: A power supply system includes an Offline Total Power Management Integrated Circuit (OTPMIC). The OTPMIC controls a Power Factor Correction (PFC) converter, a main AC/DC converter, and a standby AC/DC converter. A PFC Autodetect circuit in the OTPMIC monitors current flow in the PFC converter. If a high power condition is detected, then the PFC Autodetect circuit enables the PFC converter. The high power condition may be a voltage drop across a current sense resistor of a predetermined voltage for a predetermined time, within one half period of the incoming AC supply voltage. If a low power condition is detected, then the PFC Autodetect circuit disables the PFC converter. The PFC Autodetect circuit stores an IMON value that determines the predetermined voltage, and a TMON value that determines the predetermined time. The IMON and TMON values are loaded into the Autodetect circuit across an optocoupler link of the standby converter.
    Type: Application
    Filed: November 19, 2013
    Publication date: May 21, 2015
    Applicant: Active-Semi, Inc.
    Inventors: Steven Huynh, Hue Khac Trinh, Khanh Quang Dinh, Duong Cong Le, Degang Xia