Trung Q Nguyen

US Patent:

6522190, Feb 18, 2003

Filed:

Oct 31, 2001

Appl. No.:

09/999103

Inventors:

Randhir Singh Malik - Cary NC
Trung Minh Nguyen - Durham NC
William Hemena - Raleigh NC

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H03K 1762

US Classification:

327408, 327 63, 307 64

Abstract:

The present invention provides a highly efficient power supply with redundant multiple input voltage sources. The power supply uses switching transistors, specifically MOSFETs, to create paths for current from one of the voltage sources to the load. The switching transistors are switched either âonâ or âoffâ by comparators which compare the output from the voltage sources. These comparators allow the highest voltage source to provide power to the load, and keep the other switching transistors âoffâ that connect the common load to other voltage sources. Because the switching transistors have lower conduction losses than diodes in conventional power supplies, the power supply in accordance with the present invention is more efficient.

US Patent:

6529162, Mar 4, 2003

Filed:

May 17, 2001

Appl. No.:

09/859927

Inventors:

Irwin L. Newberg - Pacific Palisades CA 90272
Oleg Brovko - Los Angeles CA 90066
Steve I. Hsu - Rancho Palos Verdes CA 90275
Robert A. Kosmala - Playa Del Rey CA 90193
Trung T. Nguyen - Huntington Beach CA 92646
Ricardo Rico, Jr. - Downey CA 90241

International Classification:

H01Q 322

US Classification:

342375, 342372, 342373

Abstract:

A system and technique for phased array antenna beam steering for transmitting and receiving without sending the waveform through an actual (physical) time delay when a time varying frequency is used as the waveform. The inventive system is adapted for use with an antenna having an array of radiating elements and includes a plurality of signal sources. Each source is adapted to provide a signal having a predetermined frequency offset signal for an associated radiating element or set of radiating elements. For transmit a plurality of first mixers is provided. Each of the first mixers is coupled to receive an excitation signal as a first input and the output from a respective one of the sources as a second input. The output of each mixer is coupled to a respective subset of the antenna radiating elements. In effect, each of the sources provides a virtual time delay.

US Patent:

6664920, Dec 16, 2003

Filed:

Nov 18, 1993

Appl. No.:

08/154051

Inventors:

Charles J. Mott - El Segundo CA
Trung T. Nguyen - Huntington Beach CA

Assignee:

Raytheon Company - Lexington MA

International Classification:

G01S 1338

US Classification:

342129, 342 70, 342196

Abstract:

A cancellation technique embodied in a system and a radar signal processing method that is employed to detect near-range targets. The present invention uses a frequency-modulation continuous-wave (FMCW) or stepped frequency waveform and is capable of detecting near-range targets that would normally be obscured by transmitter leakage and internal reflections. This cancellation technique works by transmitting one or more reference ramp signals and then subtracting the coherent average of the transmitted reference ramp signals from a group of succeeding transmitted and received ramp return -signals. The resulting group of FM ramp return signals is noncoherently integrated to achieve more stable target detection statistics. More particularly, the present technique implements the following processing steps. Generating a predetermined number of reference ramp signals.

US Patent:

6888490, May 3, 2005

Filed:

Jul 20, 2004

Appl. No.:

10/894792

Inventors:

Oleg Brovko - Los Angeles CA, US
Eric Wayne Day - Lomita CA, US
Trung T. Nguyen - Huntington Beach CA, US
Jing Zhao - Moreno Valley CA, US
Mark S. Klemens - Los Angeles CA, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

G01S013/90

US Classification:

342 25A, 342 25 R, 342 25 F

Abstract:

A synthetic aperture radar (SAR) image of a wide coverage area is acquired during a frame containing a first plurality of ambiguities induced in the SAR image from radar scatterers within the area. The area is illuminated with radar pulses and a segmented receive antenna oriented towards the area. The segmented receive antenna has a second plurality of sub-apertures, where the second plurality of sub-apertures is larger than the first plurality of ambiguities. Each sub-aperture has its own receiver. The digital stream from each receiver is stored in a computer for the duration of the frame to obtain frame data. A SAR image is extracted from the frame data. The first plurality of ambiguities are identified from analysis of the frame data, and a correction is computed to account for the first plurality of ambiguities contained within the synthetic aperture image. The correction is applied to reduce distortions caused by the ambiguities in the SAR image.

US Patent:

7679217, Mar 16, 2010

Filed:

Dec 28, 2007

Appl. No.:

11/966432

Inventors:

Cecil C. Dishman - Raleigh NC, US
Eino A. Lindfors - Raleigh NC, US
Randhir S. Malik - Cary NC, US
Trung M. Nguyen - Morrisville NC, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H02J 9/00

US Classification:

307 64, 307 87

Abstract:

An apparatus, system, and method are disclosed for a high efficiency redundant power system. First and second power supplies are connected in parallel to power a load. Each power supply includes a primary stage and a regulator stage. Each primary stage regulates voltage on an internal bus that is input for each regulator stage. Each regulator stage regulates a regulated bus connected to the load. A power meter detects power provided to the load and determines if the provided power is below a predefined power threshold. A regulator control module shuts down the regulator stage of the first power supply after the provided power falls below the predefined power threshold so the second power supply powers the load and the primary stage of the first power supply remains operational. A recovery module starts up the regulator stage of the first power supply after failure of the second power supply.

US Patent:

7698585, Apr 13, 2010

Filed:

Jul 10, 2008

Appl. No.:

12/170983

Inventors:

Randhir S. Malik - Cary NC, US
Trung M. Nguyen - Durham NC, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1/32

US Classification:

713320, 713300, 323246

Abstract:

An apparatus, system, and method is provided for reducing idle power in a power supply. The apparatus includes a connection module to determine whether a load is connected to the output terminal of the power supply. Also included is an idle module that turns off the power supply for an idle interval when the connection module determines that a load is not connected to the output. A monitor module turns on the power supply for a monitor interval when the idle interval ends. During the monitor interval, the connection module determines whether the load has been connected to the output terminal of the power supply. An activation module turns on the power supply if the connection module determines, during the monitor interval, that the load has been connected to the power supply. If the load has not been connected, another idle interval is initiated.

US Patent:

7724487, May 25, 2010

Filed:

Jul 10, 2008

Appl. No.:

12/171086

Inventors:

Cecil C. Dishman - Raleigh NC, US
Randhir S. Malik - Cary NC, US
Trung M. Nguyen - Durham NC, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H02H 3/00
H02H 3/08
H02H 9/02
H02H 9/08

US Classification:

361 82, 361 84, 361 931, 361 939

Abstract:

An apparatus, system, and method are disclosed for preventing reverse current in a switching power supply. An electrical connector receives an input current from an electric source. An input current limiting module substantially prevents the input current from reaching a switching power supply when the input current is flowing in a reverse direction. A voltage reduction module reduces an input voltage of the switching power supply to a switching voltage when the input current is flowing in a forward direction. A switching module closes a switch in response to the voltage reduction module providing the switching voltage. The switch provides the input current a lower impedance path to the switching power supply than does the input current limiting module.

US Patent:

7908505, Mar 15, 2011

Filed:

Sep 28, 2007

Appl. No.:

11/864613

Inventors:

Randhir S. Malik - Cary NC, US
Cecil C. Dishman - Raleigh NC, US
Ted A. Howard - Cary NC, US
Eino A. Lindfors - Raleigh NC, US
Trung M. Nguyen - Morrisville NC, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1/30

US Classification:

713340, 713300, 713330, 714 47, 714 48

Abstract:

An apparatus, system, and method are disclosed for event, time, and failure state recording in a power supply. Disclosed is a power supply that receives AC voltage as an input and provides regulated DC voltage as an output; a microcontroller integrated into the power supply that regulates output voltage and monitors, records, and reports operating conditions of the power supply; and a non-volatile solid-state storage that can be repeatedly read from, written to, and erased by the microcontroller and integrated within the microcontroller such that only a single address is needed to access both the microcontroller and the solid-state storage, the solid-state storage configured to store operating data received from the microcontroller, the operating data including the recorded operating conditions of the power supply.