Patents by Inventor Tranh T. Nguyen

Tranh T. Nguyen 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).

  • Patent number: 7307474
    Abstract: An amplifier is provided. The amplifier comprises an H-bridge with two halves. A capacitor and two inductors are coupled to the H-bridge. Each inductor, a half of the H-bridge, and the capacitor are configured as a boost converter.
    Type: Grant
    Filed: December 21, 2005
    Date of Patent: December 11, 2007
    Assignee: NPhysics, Inc.
    Inventor: Tranh T. Nguyen
  • Patent number: 7221216
    Abstract: A self-oscillating switching amplifier having an error amplifier output combined with the output of an output signal differentiator according predetermined weighing factors to force a small oscillation around the averaged output signal at a high frequency. The feedback voltage is sensed at the output of the switching amplifier. Additional feedback can be derived from a switching node of the power switch. The switching of the power switch can be dynamically changed from binary switching when the amplitude of the audio signal is low, to ternary switching when the amplitude of the input signal is high to minimize distortion of the output signal. The amplifier can be supplied with a pulsing voltage. In certain embodiments the output signal differentiator is simply a capacitor or a LC resonance circuit coupled directly to an appropriate speaker terminal for the highest possible self-oscillating frequency of the switching amplifier.
    Type: Grant
    Filed: May 18, 2005
    Date of Patent: May 22, 2007
    Assignee: NPhysics, Inc.
    Inventor: Tranh T. Nguyen
  • Patent number: 6496059
    Abstract: A family of power amplifiers called class-N amplifiers comprising a modulator, a pulse-transmitting means, a power switch, a power transformer, and a synchronous demodulator. The modulator produces both PWM pulses and polarity pulses sent via pulse-transmitting means to the power switch to modulate an unregulated DC supply voltage electrically isolated from the amplifier's input and output, and to the synchronous demodulator. The power transformer transmit modulated voltage to the synchronous demodulator, which drives a load. There is no intermediary DC voltage in the amplifiers which operate in ternary mode.
    Type: Grant
    Filed: November 17, 2000
    Date of Patent: December 17, 2002
    Inventor: Tranh T. Nguyen
  • Patent number: 5857529
    Abstract: An apparatus for uprooting weeds comprising a rotatable handle, a base, a rotatable contacting assembly co-axial with the handle, and a co-axial co-directional rotation multiplying assembly linking the handle to the contacting means wherein the rotation of the contacting means is many times the rotation of the handle so that the weed uprooting action can be achieved by pulling the handle pependicularly by a short distance.
    Type: Grant
    Filed: September 26, 1996
    Date of Patent: January 12, 1999
    Inventor: Tranh T. Nguyen