摘要:
A power converter includes a first power input to receive AC input power, a second power input to receive backup power, a first DC bus configured to provide a positive DC output voltage, a second DC bus configured to provide a negative DC output voltage, and a power conversion circuit coupled to the first DC bus and the second DC bus. The power conversion circuit has an inductor, a first switch device coupled in series with the inductor, a second switch device coupled in series with the first switch device, and a bypass relay coupled in parallel with the second switch device. The power conversion circuit is switchably coupled to the first power input and the second power input, and is operable to charge the inductor and generate the positive and negative DC output voltages.
摘要:
An uninterruptible power supply includes a first input to receive input power from an input power source, an output to provide output power, a switch, a first logic power supply coupled to the switch, a back-up power source, a charger, a main logic power supply and power converter circuitry. The switch is configured to close when a characteristic of the input power is within a selected range. The first logic power supply is coupled to the switch and configured to receive input power from the input power source when the switch is closed. The first logic power supply has a first DC output. The back-up power source has a second DC output and is coupled to the first DC output at a common node. The charger has a third DC output and is coupled to the common node. The main logic power supply is coupled to the common node and is configured to receive at least one of the first DC output, the second DC output and the third DC output. The power converter circuitry is coupled to the backup power source and the first input and is configured to provides the output power derived from at least one of power at the first input and power from the backup power source.
摘要:
Embodiments of the present invention provide techniques for searching enterprise data using semantic information associated with enterprise applications. One or more searchable data definitions that describe searchable data associated with one or more enterprise applications may identify semantic relationships among searchable data in the application. An ontology for the application that describes semantic relationships among data associated with the application may be generated from the searchable data definitions. The ontology may be used to execute search queries and provide search results that include or result from semantic relationships among the searched data.
摘要:
Systems and methods are provided for distributing power to a load by controlling an uninterruptible power supply that has an inverter and a filter, where the filter has an inductor and a capacitor. The systems and methods apply a pulse width modulation control signal to the inverter, sample inverter inductor current and compare the inductor current to a reference current. A duty cycle of the pulse width modulation control signal is adjusted to drive the inductor current at a second sampling time to a value substantially equal to a reference current at a first sampling time. The systems and methods can filter harmonic distortion from output signals and control uninterruptible power supply output.
摘要:
Methods and systems for providing searchable data associated with enterprise applications are provided. An asynchronous feed may be generated from data stored in a database and searched by search engine crawlers. The feed may be populated with searchable data based on a searchable object definition that describes the location of searchable data within the database. The feed also may enforce access restrictions set by the enterprise applications to prevent unauthorized access to the searchable data.
摘要:
Systems and methods disclosed herein monitor and control input to a converter in one or more of a UPS, a frequency converter, or a line conditioner. Distortion due at least in part to ripple voltage can be removed from a control signal that controls input current to the converter. The systems and methods described herein afford a simple and effective way to reduce or eliminate one or more of subharmonic oscillation and total harmonic distortion from a converter input current during synchronous and asynchronous modes of operation. The converter may include one or more of a rectifier and an inverter.
摘要:
A power converter system is provided for supplying power to an electrical load. The power converter system includes a power converter circuit adapted to perform an AC to DC power conversion and an active clamp circuit coupled to the power converter circuit for regulating DC bus voltage overshoots. The power converter circuit is configured from a plurality of semiconductor switches having reverse voltage withstand capability.
摘要:
An article comprises a bobbin wire; an electrically insulating backing disposed upon the bobbin wire; a mica paper disposed upon the electrically insulating backing and wound around the backing; and a silicone coating disposed upon the electrically insulating backing. A method of manufacturing an article comprises disposing an electrically insulating backing upon a bobbin wire; disposing mica paper upon the electrically insulating backing; and coating the mica paper with a silicone coating.
摘要:
An aspect of the present invention simplifies provisioning of asynchronous interaction with enterprise suites having synchronous integration points. In one embodiment, a digital processing system receives, from a user, data indicating that asynchronous interaction is required for a synchronous integration point of an enterprise suite, and in response, auto-generates a set of service oriented architecture (SOA) artifacts designed to synchronously invoke the synchronous integration point and provide asynchronous interaction with external systems. The auto-generated SOA artifacts are then deployed in SOA server, whereby external systems can interact asynchronously to access a functionality provided by the synchronous integration point. According to another aspect, the system, also receives from the user, a second data indicating a set of policies to be applied, and in response, auto-generates the set of SOA artifacts to implement the set of policies during asynchronous interaction with external systems.
摘要:
A search modeling tool is provided that can communicate with multiple enterprise applications to create object definitions describing searchable data stored in each application. The object definitions may be used to extract searchable data from the applications, thus allowing for manipulation of the data in formats usable for text searching, user presentation, and other applications. The search modeler may interface with each application using common protocols, allowing for generalization of object definitions and subsequent crawling across a variety of enterprise applications.