Alpha Technologies Services, Inc.

Alpha Technologies Inc.

Other

James Patrick Richardson

Thanh Le

Litcho Datzov

Henry E St Louis, Jr

A James Owen, Jr

Than Quoc Le

Thanh Quoc Le

A ferroresonant transformer assembly comprising, a core, a main shunt, first, second, and third windings, first and second tap connectors, and a selection connector. The first windings configured to be operatively connected to a primary power source. The first tap connector operatively connected to a first intermediate point defined by the third windings. The second tap connector operatively connected to a second intermediate point defined by the third windings. The selection connector operatively connected to the at least one load. Based on voltage requirements of the at least one load, the selection connector is operatively selectively connected to a selected tap connector selected from the first and second tap connectors.

Ferroresonant transformer systems and methods

An uninterruptible power supply for providing an output power signal to a load comprises a ferroresonant transformer, a resonant capacitor, and an inverter. The resonant capacitor is operatively connected to the ferroresonant transformer. The inverter is operatively connected to the ferroresonant transformer. The inverter is configured to generate the output power signal based on at least one inverter control signal such that the output power signal is a quasi square wave having at least one change of phase and an upper limit. The at least one inverter control signal is held in an OFF state during at least a portion of the at least one change of phase, pulse-width modulated during at least a portion of the at least one change of phase, and held in an ON state when the output power signal is at the upper limit.

Switching systems and methods for use in uninterruptible power supplies

A ferroresonant transformer assembly, which is adapted to be connected to a primary power source, an inverter system, a resonant capacitor, and at least one load, comprises a core, a main shunt, and first, second, and third windings. The main shunt is arranged to define a primary side and a secondary side of the ferroresonant transformer. The first windings are arranged on the primary side of the ferroresonant transformer and are configured to be operatively connected to the primary power source. The second windings are arranged on the secondary side of the ferroresonant transformer and are configured to be operatively connected to the inverter system. The third windings arranged on the secondary side of the ferroresonant transformer and are configured to be selectively operatively connected to or disconnected from the resonant capacitor.

Ferroresonant transformer for use in uninterruptible power supplies

An uninterruptible power supply for providing an output power signal to a load has a ferroresonant transformer, a resonant capacitor operatively connected to the ferroresonant transformer, and an inverter operatively connected to the ferroresonant transformer. The inverter is configured to generate the output power signal based on at least one inverter control signal such that the output power signal is a quasi square wave having a first change of phase, an upper limit, and a second change of phase. The at least one inverter control signal is pulse-width modulated between the first change of phase and the upper limit, pulse-width modulated between the upper limit and the second change of phase, and held in an ON state when the output power signal is at the upper limit.

A ferroresonant transformer is adapted to be connected to a primary power source, an inverter system, and a resonant capacitor. The ferroresonant transformer comprises a core, a main shunt arranged to define a primary side and a secondary side of the ferroresonant transformer, first windings arranged on the primary side of the ferroresonant transformer, second windings arranged on the secondary side of the ferroresonant transformer, and third windings arranged on the secondary side of the ferroresonant transformer. The first windings are operatively connected to the primary power source.

The present invention may be embodied as an uninterruptible power supply comprising an input section, an output section, an inverter section, and a transformer. The transformer is operatively connected to the input section, the output section, and the inverter section. The uninterruptible power supply operates in a line mode and in a standby mode. In the standby mode, the output section generates an output power signal from a standby signal generated by the inverter section based on the alternative power source and at least one inverter control signal. When the uninterruptible power supply operates in the standby mode, the at least one inverter control signal is pulse-width modulated during at least a first portion of a cycle of the output power signal and not pulse-width modulated during at least a second portion of the cycle of the output power signal.

A ferroresonant transformer comprises a core, a main shunt, first windings, second windings, and third windings. The main shunt arranged relative to the core to define a primary side and a secondary side of the ferroresonant transformer. The first windings are arranged on the primary side of the ferroresonant transformer and are operatively connected to the primary power source. The second windings are arranged on the secondary side of the ferroresonant transformer and are operatively connected to the secondary power source. The third windings are arranged on the secondary side of the ferroresonant transformer and are operatively connected to the resonant capacitor. When a primary signal is present on the first windings, a first output signal is present on at least a portion of the third windings. When a secondary power is present on the second windings, a second output signal is present on at least a portion of the third windings.

A golf practice hole with a variable diameter rim provides a flexible material positioned over a series of radially-movable supports that each define a portion of an edge or rim of a hole. The flexible material is typically provided with expansion areas that can include slits that define separate flaps of material. The flaps of material are tensioned beneath the movable supports to maintain the flaps in engagement with the supports. As the supports are moved radially-inwardly and radially-outwardly, the material follows the supports and defines a continuous surface above the rim throughout a range of movement of the supports. The range of movement defines a corresponding range of hole rim diameters. The flexible surface remains free of discontinuities and breaks despite diametral changes in the rim and provides an improved playing surface.

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Bellingham, WA, United States of America

James Patrick Richardson