Alexandre P Ferreira

Author:

Alexandre Rodrigues Ferreira

ISBN #:

8588108119

Author:

Alexandre Rodrigues Ferreira

ISBN #:

8588108127

Author:

Alexandre Rodrigues Ferreira

ISBN #:

8588108135

Author:

Alexandre Rodrigues Ferreira

ISBN #:

8588108186

Author:

Alexandre Rodrigues Ferreira

ISBN #:

8588108194

Author:

Alexandre Rodrigues Ferreira

ISBN #:

8588108208

US Patent:

8493054, Jul 23, 2013

Filed:

Jun 14, 2011

Appl. No.:

13/159568

Inventors:

Wael El-Essawy - Austin TX, US
Alexandre Peixoto Ferreira - Austin TX, US
Thomas Walter Keller - Austin TX, US
Sani R. Nassif - Austin TX, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G01R 31/28
G01R 27/08

US Classification:

324 74, 324 7611, 324723

Abstract:

Calibration of a non-contact voltage sensor provides improved accuracy for measuring voltage on a conductor such as an AC branch circuit wire. In a calibration mode, a predetermined voltage is imposed on a first voltage sensing conductor integrated in the non-contact voltage sensor, while a voltage on a second voltage sensing conductor is measured using a circuit of predetermined input impedance. The capacitance between the wire and each of the voltage sensing conductors may be the same, so that in measurement mode, when the first and second voltage sensing conductors are coupled together, the effective series capacitance provided in combination with the predetermined input impedance is four times as great. The results of the voltage measurement made in the calibration mode can thereby be used to adjust subsequent voltage measurements made in measurement mode with the first and second voltage sensing conductors combined in parallel.

US Patent:

8508212, Aug 13, 2013

Filed:

Jun 14, 2011

Appl. No.:

13/159536

Inventors:

Wael El-Essawy - Austin TX, US
Alexandre Peixoto Ferreira - Austin TX, US
Thomas Walter Keller - Austin TX, US
Sani R. Nassif - Austin TX, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G01R 11/32

US Classification:

324 74, 324239, 324500, 323277

Abstract:

Calibration of a non-contact current sensor provides improved accuracy for measuring current conducted through a conductor such as an AC branch circuit wire. In a calibration mode, a predetermined current is injected through a voltage sensing conductor integrated in the non-contact current sensor. The magnitude of the magnetic field is measured using a sensing element of the non-contact current sensor. Then, when operating in measurement mode, a current conducted in a wire passing through the non-contact current sensor is determined by correcting the output of the non-contact current sensor using the result of the measurement made in the calibration mode. The voltage sensing conductor is used to provide an indication of the magnitude and/or the phase of the electrostatic potential on the wire. The calibration current may be a DC current, and calibration may be performed while the conductor is carrying an AC current.

US Patent:

20120200291, Aug 9, 2012

Filed:

Feb 9, 2011

Appl. No.:

13/024181

Inventors:

Gary D. Carpenter - Austin TX, US
Wael El-Essawy - Austin TX, US
Alexandre Peixoto Ferreira - Austin TX, US
Thomas Walter Keller - Austin TX, US
Juan C. Rubio - Austin TX, US
Michael A. Schappert - Wappingers Falls NY, US

Assignee:

INTERNATIONAL BUSINESS MACHINES CORPORATION - Armonk NY

International Classification:

G01R 33/02
G01R 1/04

US Classification:

324252, 324156, 324244

Abstract:

A detachable current and voltage sensor provides an isolated and convenient device to measure current passing through a conductor such as an AC branch circuit wire, as well as providing an indication of an electrostatic potential on the wire, which can be used to indicate the phase of the voltage on the wire, and optionally a magnitude of the voltage. The device includes a housing that contains the current and voltage sensors, which may be a ferrite cylinder with a hall effect sensor disposed in a gap along the circumference to measure current, or alternative a winding provided through the cylinder along its axis and a capacitive plate or wire disposed adjacent to, or within, the ferrite cylinder to provide the indication of the voltage.

US Patent:

20120200293, Aug 9, 2012

Filed:

Apr 19, 2012

Appl. No.:

13/451524

Inventors:

Gary D. Carpenter - Austin TX, US
Wael El-Essawy - Austin TX, US
Alexandre Peixoto Ferreira - Austin TX, US
Thomas Walter Keller - Austin TX, US
Juan C. Rubio - Austin TX, US
Michael A. Schappert - Wappingers Falls NY, US

Assignee:

INTERNATIONAL BUSINESS MACHINES CORPORATION - Armonk NY

International Classification:

G01R 33/02

US Classification:

324252

Abstract:

A method of measurement using a detachable current and voltage sensor provides an isolated and convenient technique for to measuring current passing through a conductor such as an AC branch circuit wire, as well as providing an indication of an electrostatic potential on the wire, which can be used to indicate the phase of the voltage on the wire, and optionally a magnitude of the voltage. The device includes a housing that contains the current and voltage sensors, which may be a ferrite cylinder with a hall effect sensor disposed in a gap along the circumference to measure current, or alternative a winding provided through the cylinder along its axis and a capacitive plate or wire disposed adjacent to, or within, the ferrite cylinder to provide the indication of the voltage.

US Patent:

20120319676, Dec 20, 2012

Filed:

Jun 14, 2011

Appl. No.:

13/159554

Inventors:

Wael El-Essawy - Austin TX, US
Alexandre Peixoto Ferreira - Austin TX, US
Thomas Walter Keller - Austin TX, US

Assignee:

INTERNATIONAL BUSINESS MACHINES CORPORATION - Armonk NY

International Classification:

G01R 19/00
G01R 1/20

US Classification:

324126

Abstract:

A detachable current sensor provides an isolated and convenient device to measure current passing through a cable such as an AC power cable or non-metallic (NM) sheathed cable. Information about the magnitude and or phases of the currents passing through and/or voltages on the conductors is obtained by measuring the magnetic field at multiple circumferential positions around the cable using multiple semiconductor magnetic field sensors. A processing subsystem coupled to the multiple semiconductor magnetic field sensors determines information about the currents flowing in the conductors of the cable, including the current magnitude(s), and/or the phases and number of phases present in the cable, which can form part of a power measurement system that is used for energy monitoring, and/or for control purposes.

US Patent:

20130054981, Feb 28, 2013

Filed:

Aug 23, 2011

Appl. No.:

13/215565

Inventors:

Thomas M. Brey - Cary NC, US
Wael R. El-Essawy - Austin TX, US
Alexandre P. Ferreira - Austin TX, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1/26

US Classification:

713300

Abstract:

A mechanism is provided for dynamically changing power caps for a set of powered elements. Current being consumed by the set of powered elements P on a branch circuit is measured and available current on the branch circuit is determined. A new total power cap for a current time period t is identified based on a current total power cap and the measured current. A difference in total power caps (ΔTPC) is determined and, for each powered element p in the set of powered elements P at the current time period, a new power cap PC (p,t) is determined based on the previous power cap PC(p,t−1) and the difference of the total power caps to the set of powered elements P. A power cap of each powered element p is then dynamically set to the new power cap PC (p,t).

US Patent:

20130054985, Feb 28, 2013

Filed:

Aug 21, 2012

Appl. No.:

13/590733

Inventors:

Thomas M. Brey - Cary NC, US
Wael R. El-Essawy - Austin TX, US
Alexandre P. Ferreira - Austin TX, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1/26

US Classification:

713300

Abstract:

A mechanism is provided for dynamically changing power caps for a set of powered elements. Current being consumed by the set of powered elements P on a branch circuit is measured and available current on the branch circuit is determined. A new total power cap for a current time period t is identified based on a current total power cap and the measured current. A difference in total power caps (ΔTPC) is determined and, for each powered element p in the set of powered elements P at the current time period, a new power cap PC (p,t) is determined based on the previous power cap PC(p,t−1.) and the difference of the total power caps to the set of powered elements P. A power cap of each powered element p is then dynamically set to the new power cap PC (p,t).

US Patent:

20130054993, Feb 28, 2013

Filed:

Aug 25, 2011

Appl. No.:

13/217624

Inventors:

Wael R. El- Essawy - Austin TX, US
Alexandre Peixoto Ferreira - Austin TX, US
Juan Carlos Rubio - Austin TX, US

Assignee:

INTERNATIONAL BUSINESS MACHINES CORPORATION - Armonk NY

International Classification:

G06F 1/26
G06F 1/32

US Classification:

713323, 713300

Abstract:

A system, and computer program product for relating a data processing system with a power branch circuit are provided in the illustrative embodiments. A second signal is combined with a power signal to form a combination signal, the power signal including a first power usage by the data processing system and a second power usage by a modulating signal. The second signal is synchronized with the modulating signal in the power signal. A determination is made whether an amplitude of a frequency of the second signal is increasing in the combined signal over a period. Responsive to the determining being affirmative, the data processing system is related with the power branch circuit.