Robert D Carroll

US Patent:

8461816, Jun 11, 2013

Filed:

Jun 16, 2010

Appl. No.:

12/816744

Inventors:

Venkat Sreenivas - Winchester MA, US
Robert T. Carroll - Andover MA, US
James Noon - Merrimack NH, US

Assignee:

International Rectifier Corporation - El Segundo CA

International Classification:

G05F 1/59
G05F 1/575

US Classification:

323272, 232283

Abstract:

A controller receives a value indicative of a number of phases in a power supply to be activated for producing an output voltage to power a load. The controller utilizes the value to adjust a magnitude of at least one control coefficient associated with the power supply. The control can also use the value of the input voltage to adjust the magnitude of at least one control coefficient. The controller digitally computes values for the one or more control coefficients based on the received value indicating the number of phases in the power supply to be activated for producing the output voltage. Based on the adjusted magnitude of the at least one control coefficient, the controller produces control signals to control the number of phases in the power supply as specified by the value to produce the output voltage.

US Patent:

20080216351, Sep 11, 2008

Filed:

Feb 8, 2008

Appl. No.:

12/069270

Inventors:

Robert Carroll - South Hamilton MA, US
Aaron Azevedo - Newburyport MA, US
Mike Rouse - San Diego CA, US
Brian Egne - Cardiff CA, US

Assignee:

ZuitSports, Inc. - Vista CA

International Classification:

A43C 11/00
A43C 7/00

US Classification:

36 501, 247124, 247121

Abstract:

A shoe has a quick-tighten lacing system with a shoelace partially wound around lacing control elements in a pair of rows between an ankle opening and a toe. The lacing system has one or two locking elements for enabling a quick tightening of the shoelace.

US Patent:

20120212193, Aug 23, 2012

Filed:

Apr 14, 2011

Appl. No.:

13/087188

Inventors:

Venkat Sreenivas - Winchester MA, US
Robert T. Carroll - Andover MA, US

International Classification:

G05F 1/10

US Classification:

323234

Abstract:

A control circuitry can be configured to receive an error signal indicating a difference between an output voltage of the power supply and a desired setpoint for the output voltage. According to one configuration, depending on the error signal, the control circuitry initiates switching between operating the control circuitry in a pulse width modulation mode and operating the control circuitry in a pulse frequency modulation mode to produce an output voltage. Operation of the control circuitry in the pulse frequency modulation mode during a transient condition, such as when a dynamic load instantaneously requires a different amount of current, enables the power supply to satisfy current consumption by the dynamic load. Subsequent to the transient condition, the control circuitry switches back to operation in the pulse width modulation mode.

US Patent:

20130119951, May 16, 2013

Filed:

Feb 14, 2012

Appl. No.:

13/396495

Inventors:

Venkat Sreenivas - Winchester MA, US
Robert T. Carroll - Andover MA, US

International Classification:

G05F 1/10

US Classification:

323234

Abstract:

A power supply system includes a PID control circuit, a signal shaping circuit, and a PWM control circuit. The PID control circuit generates a signal based on an error voltage of the power supply system. The signal shaping circuit receives and converts the signal outputted from the PID control circuit into a linear control signal. To reduce cost, the shaping circuit can include a piecewise linear implementation. During non-transient load conditions, the PWM control circuit utilizes the linear control signal outputted from the signal shaping circuit to adjust a switching period of a power supply control signal. The switching period of the power supply control signal is maintained within a desired range. During transients, settings of the PID control circuit are modified to provide a faster response. The switching period of the power supply control signal may be adjusted outside of the desired frequency range.

US Patent:

49930745, Feb 12, 1991

Filed:

Jan 11, 1989

Appl. No.:

7/295493

Inventors:

Robert J. Carroll - Winchester MA

International Classification:

H04R 128

US Classification:

381187

Abstract:

A spacing device which holds earphones away from the ears to create a sense of live music when the earphones are used in conjunction with loudspeakers. The spacers allow sound from loudspeakers set away from the user to reach the ear from all directions. When the spacer is worn to hold earphones a distance from the ear while listening to recorded music played through both earphones and loudspeakers from the same source the user experiences an increase in ambience or sense of concert-hall realism.

US Patent:

52573184, Oct 26, 1993

Filed:

Feb 11, 1991

Appl. No.:

7/653187

Inventors:

Robert J. Carroll - Winchester MA

International Classification:

H04R 128

US Classification:

381187

Abstract:

A spacing device which holds earphones away from the ears to create a sense of live music when the earphones are used in conjunction with loudspeakers. The spacers allow sound from loudspeakers set away from the user to reach the ear from all directions. A volume control connected between the earphones and amplifier provides sound level adjustment for creating an optimal condition of presence as sensed by the listener.

US Patent:

20160261182, Sep 8, 2016

Filed:

Mar 4, 2015

Appl. No.:

14/637485

Inventors:

- El Segundo CA, US
Venkat Sreenivas - Winchester MA, US
Parviz Parto - Laguna Niguel CA, US
Robert T. Carroll - Andover MA, US

International Classification:

H02M 3/04

Abstract:

A hybrid power supply circuit includes a digital circuit, a digital-to-analog converter circuit, and an analog compensator circuit (analog control circuit). According to one configuration, the digital circuit includes a digital pre-filter that substantially matches settings of analog filter circuitry present in the analog compensator circuit. During operation, the digital circuit receives control input indicating how to control a magnitude of an output voltage produced by the power supply circuit. The digital circuit passes the received through the digital pre-filter to produce a (filtered) digital reference voltage. The digital-to-analog converter circuit converts the received digital reference voltage into an analog reference voltage (a filtered rendition of the received control input). The analog compensator circuit receives and uses the digitally pre-filtered analog reference voltage as a basis to control the magnitude of the output voltage produced by the power supply circuit.

US Patent:

20140312858, Oct 23, 2014

Filed:

Jun 30, 2014

Appl. No.:

14/319692

Inventors:

Venkat Sreenivas - Winchester MA, US
Robert T. Carroll - Andover MA, US

International Classification:

H02M 3/156

US Classification:

323234

Abstract:

A control circuitry can be configured to receive an error signal indicating a difference between an output voltage of the power supply and a desired setpoint for the output voltage. According to one configuration, depending on the error signal, the control circuitry initiates switching between operating the control circuitry in a pulse width modulation mode and operating the control circuitry in a pulse frequency modulation mode to produce an output voltage. Operation of the control circuitry in the pulse frequency modulation mode during a transient condition, such as when a dynamic load instantaneously requires a different amount of current, enables the power supply to satisfy current consumption by the dynamic load. Subsequent to the transient condition, the control circuitry switches back to operation in the pulse width modulation mode.