Jeffrey A Curtis

US Patent:

6400591, Jun 4, 2002

Filed:

Mar 19, 2001

Appl. No.:

09/811974

Inventors:

David E. Reilly - Concord MA
Emanual E. Landsman - Lexington MA
Jeffrey Curtis - Dunstable MA

Assignee:

American Power Conversion - West Kingston RI

International Classification:

H04M 700

US Classification:

363125, 307 66

Abstract:

Embodiments of the present invention are directed to an uninterruptible power supply for providing AC power to a load. In embodiments of the present invention, the uninterruptible power supply includes an input to receive AC power from an AC power source, an output that provides AC power, a DC voltage source that provides DC power, the DC voltage source having an energy storage device, an inverter operatively coupled to the DC voltage source to receive DC power and to provide AC power. The inverter includes first and second output nodes to provide AC power to the load, first and second input nodes to receive DC power from the DC voltage source, a resonant element having a first terminal and a second terminal, the second terminal being electrically coupled to the first output node, a first switch electrically coupled between the first terminal of the resonant element and the first input node, wherein during a first time period, the first switch is controlled to allow an electrical current path to connect the resonant element to the capacitive element, an electrical current of the path storing energy in the resonant element and charging the capacitive element to a first voltage level, and during a second time period, the first switch is controlled to block the current path to cause the stored energy in the resonant element to further charge the capacitive element to a second voltage level during the second time period. The uninterruptible power supply further includes a transfer switch constructed and arranged to select one of the AC power source and the DC voltage source as an output power source for the uninterruptible power supply.

US Patent:

6728119, Apr 27, 2004

Filed:

Jun 4, 2002

Appl. No.:

10/162537

Inventors:

David E. Reilly - Concord MA
Emanuel E. Landsman - Lexington MA
Jeffrey Curtis - Dunstable MA

Assignee:

American Power Conversion - West Kingston RI

International Classification:

H02M 700

US Classification:

363 37, 363125, 307 66

Abstract:

Embodiments of the present invention are directed to an uninterruptible power supply for providing AC power to a load. In embodiments of the present invention, the uninterruptible power supply includes an input to receive AC power from an AC power source, an output that provides AC power, a DC voltage source that provides DC power, the DC voltage source having an energy storage device, an inverter operatively coupled to the DC voltage source to receive DC power and to provide AC power. The inverter includes first and second output nodes to provide AC power to the load, first and second input nodes to receive DC power from the DC voltage source, a resonant element having a first terminal and a second terminal, the second terminal being electrically coupled to the first output node, a first switch electrically coupled between the first terminal of the resonant element and the first input node, wherein during a first time period, the first switch is controlled to allow an electrical current path to connect the resonant element to the capacitive element, an electrical current of the path storing energy in the resonant element and charging the capacitive element to a first voltage level, and during a second time period, the first switch is controlled to block the current path to cause the stored energy in the resonant element to further charge the capacitive element to a second voltage level during the second time period. The uninterruptible power supply further includes a transfer switch constructed and arranged to select one of the AC power source and the DC voltage source as an output power source for the uninterruptible power supply.

US Patent:

20200021122, Jan 16, 2020

Filed:

Jul 11, 2018

Appl. No.:

16/032761

Inventors:

- Bedford MA, US
Insun Hong - Somerville MA, US
Andrew String - Lynnfield MA, US
Jeffrey Curtis - Dunstable MA, US
Travis Pierce - Bedford NH, US

International Classification:

H02J 7/00
G05D 1/00
G05D 1/02
B60L 11/18

Abstract:

A docking station for a robotic lawnmower includes a base, an electrical connector above the base and positioned along a longitudinal axis of the docking station, and a central guide member positioned on the base and along the longitudinal axis. The central guide member includes a right lateral surface extending away from the longitudinal axis and toward the electrical connector from a first end portion proximate the longitudinal axis to a second end portion, and a left lateral surface extending away from the longitudinal axis and toward the electrical connector from a first end portion proximate the longitudinal axis to a second end portion.

US Patent:

20160279808, Sep 29, 2016

Filed:

Mar 27, 2015

Appl. No.:

14/671304

Inventors:

- Bedford MA, US
Steven Shamlian - Watertown MA, US
Jeffrey Curtis - Dunstable MA, US

International Classification:

B25J 19/00
H02J 5/00
B25J 17/00
G01D 5/347
B25J 9/16

Abstract:

A rotatable coupling includes an input housing rotatably coupled to an output housing by a tube fixed to the output housing and on which tube the input housing rotates. The coupling includes two magnetic flux concentrators disposed about the tube and defining therebetween an annular cavity, a first concentrator fixed to the input housing and a second concentrator fixed to the output housing, such that relative rotation of the housings causes relative rotation of the concentrators on either side of the annular cavity. The coupling includes concentric coils disposed within the annular cavity that permit power transfer across the coupling, a first coil fixed to the input housing and a second coil fixed to the output housing; an emitter fixed to the input housing; and a receiver fixed to the output housing and positioned to receive the signals from the emitter during the relative rotation of the housings.