Abstract: A power system for providing an output power to a load is provided. The system comprises a generator configured to generate an alternating current input power and an power converter system coupled to the generator and configured to generate an output power and provide the output power to the load through at least one transformer. The system further comprises a converter control system coupled to the converter system and configured to drive the converter system in an interleaved pattern to reduce harmonic components in the output power and the alternating current input power.

Abstract: Methods and apparatus for converting power from a power source are described. In one example embodiment, the method includes controlling multiple transformer and switchgear units coupled to a power source, and controlling multiple converter units connected in parallel. Each converter unit is coupled to a respective one of the transformer and switchgear units to form an individual thread. The transformer and switchgear unit and power converters are controlled so that the carrier waveforms for each individual thread are interleaved between each other over a carrier cycle.

Abstract: A top for a pop-up type irrigation sprinkler that utilizes a riser that pops up from a stationary sprinkler body in accordance with an embodiment to the present invention includes a cap which is threadedly attached to the sprinkler body; a co-molded seal positioned in a center of the cap with a riser opening in the center thereof, wherein the seal prevents water from leaking out of the sprinkler between the cap and the sprinkler body and between the seal and the riser.

Abstract: Systems and methods for assigning threads in a processor are disclosed. The method generally includes assigning one or more static threads to each port of a plurality of ports and processing incoming packets with the static threads. The port numbers of incoming packets processed by the static threads are stored and the number of packets processed by the static threads for each port is counted. An average thread workload for each port is calculated by dividing the number of packets processed by the number of static threads assigned to the port. A dynamic thread is assigned to the highest average thread workload port.

Abstract: A flush cap assembly for a sprinkler head in an irrigation system comprising an array of sprinkler heads, the flush cap having a body portion adapted to be removably attached to a sprinkler head, an opening in the body portion communicating with a fluid flow path in the sprinkler head through which water can exit the sprinkler head during flushing of the irrigation system, and a cover portion which is manually movable to cover and uncover the opening in the body portion to selectively prevent water from exiting a particular sprinkler head during flushing of the irrigation system. Also disclosed is a method of preparing an irrigation system for use in which flush cap assemblies as described are employed. The cover portion may be rotatable or otherwise operable, and may include an opening which is alignable with the body opening to permit water to exit during flushing.

Abstract: Methods and systems for application framework development for wireless devices are provided herein. Aspects of the method may include acquiring an MMI event from an MMI event queue within the MMI wireless framework. An identity of the acquired MMI event may be determined and the acquired MMI event may be dispatched to an event handler based on the determined identity of the acquired event. If the acquired MMI event comprises a timing event, the acquired MMI event may be dispatched to an MMI event owner within the MMI wireless framework. If the acquired MMI event comprises a keypad event, the acquired MMI event may be dispatched to a currently active MMI view within the MMI wireless framework. If the acquired MMI event comprises an addressed event, the acquired MMI event may be dispatched to a destination handler within the MMI wireless framework.

Abstract: A gradient amplifier arrangement is described that comprises a gradient amplifier power stage. The device may be employed to provide a current to a gradient coil, as in a MRI system. The circuitry disclosed includes a series coupling of a first bridge amplifier operating at a first voltage, a second bridge amplifier operating at a second voltage, a third bridge amplifier operating at a third voltage, and a gradient amplifier control stage. The amplifiers may provide output voltages at different levels, and may be switched at different times and frequencies to provide a range of output voltage and current levels.

Abstract: A photovoltaic illuminating device, comprising solar cell, electronic circuit, two rechargeable batteries, an illuminating means and a display frame to illuminate during nighttime a house's street address numerals on a roadside mailbox or its supporting post, using solar energy collected and stored in the rechargeable batteries during daytime, is disclosed.

Abstract: An AC ripple current reduction circuit for an AC converter having: an AC voltage source at the input; a first capacitor across which the circuit output voltage is provided; a first, main inductor in series with the first capacitor and the input; an auxiliary circuit including a second capacitor and a transformer coupled to the main inductor, the secondary of the transformer being in series with the second capacitor; and a means for enabling the flow of a time varying voltage across the first and second capacitors that has a frequency much less than the ripple frequency of the current in the main inductor.

Abstract: An actively quenched lamp includes a lamp and an active quenching means configured to quench the lamp. An infrared (“IR”) thermography imaging system includes at least one lamp configured to heat a surface of an object to be imaged, at least one active quenching means configured to quench the lamp, and an IR camera configured to capture a number of IR image frames of the object. A method, for actively controlling flash duration for IR thermography, includes generating an initial control signal T0, a lamp control signal T1, and a control signal T2. The method further includes activating a quenching means in response to initial control signal T0, to allow current I to flow to a lamp, activating the lamp in response to lamp trigger signal T1, and turning off the quenching means in response to control signal T2 to cut off the current I to the lamp.