Patents by Inventor Tak Ming Leung

Tak Ming Leung 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).

  • PWM regulator with discontinuous mode and method therefor
    Patent number: 7298124
    Abstract: In one embodiment, a power supply controller has a variable frequency oscillator that is used for controlling a PWM controller. The power supply controller varies a frequency of the variable frequency oscillator.
    Type: Grant
    Filed: December 1, 2004
    Date of Patent: November 20, 2007
    Assignee: Semiconductor Components Industries, L.L.C.
    Inventors: Kwok Kei Toby Kan, Tak Ming Leung
  • POWER SUPPLY CIRCUIT AND METHOD OF SOFT SWITCHING
    Publication number: 20020149951
    Abstract: A power supply (10) has a first transistor (20) coupled for switching a coil current (I19) in response to a first control signal (VC1). A second transistor (30) has a body diode (32) for discharging the coil current to produce a power factor corrected signal (VPFC) . A conduction channel (31) of the second transistor is responsive to a second control signal (VC3) for developing a second coil current (I61) from the power factor corrected signal to adjust an output signal of the power supply, where the second control signal commences a time interval (TD2) after the first control signal terminates.
    Type: Application
    Filed: April 13, 2001
    Publication date: October 17, 2002
    Inventors: Tak Ming Leung, Yim Shu Lee, Hoi Lam Martin Chow, Tze Kau Man, Guy Fung Kai Cheung, Ka-Lon Chu
  • Power supply circuit and method
    Patent number: 6462966
    Abstract: A power supply (10) has a first transistor (20) coupled for switching a coil current (Il9) in response to a first control signal (VC1). A second transistor (30) has a body diode (32) for discharging the coil current to produce a power factor corrected signal (VPFC). A conduction channel (31) of the second transistor is responsive to a second control signal (VC3) for developing a second coil current (I61) from the power factor corrected signal to adjust an output signal of the power supply, where the second control signal commences a time interval (TD2) after the first control signal terminates.
    Type: Grant
    Filed: April 13, 2001
    Date of Patent: October 8, 2002
    Assignee: Semiconductor Components Industries LLC
    Inventors: Tak Ming Leung, Yim Shu Lee, Hoi Lam Martin Chow, Tze Kau Man, Guy Fung Kai Cheung, Ka-Lon Chu