Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 8189352 | Single stage inverter device, and related controlling method, for converters of power from energy sources, in particular photovoltaic sources The present invention concerns a single stage inverter device for power converters, comprising switching means (M1-M4) capable to periodically connect an energy source, in particular a photovoltaic one, to an electric network or grid, the switching mea... | 05/29/2012 |
| 8144488 | Voltage source converter station The resistors of a filter block \in a voltage source converter station are connected with a floating neutral point. ... | 03/27/2012 |
| 8107266 | Converter for converting alternating voltage into direct voltage and conversely A converter for converting alternating voltage into direct voltage and vice versa in a converter station of a high voltage transmission system including a series connection of a plurality of converter valves. The converter has connections to transformers on both of ... | 01/31/2012 |
| 8098504 | Converter station for connecting an AC system to an end of an HVDC transmission line A converter station for connecting an AC system to an HVDC transmission line. At least two converters are arranged in two separate converter valve halls. The station includes a separate control device configured to control of each converter and an auxiliary power so... | 01/17/2012 |
| 8089785 | Power conditioning unit A photovoltaic power conditioning unit for delivering power from a dc photovoltaic power source to an ac mains power supply is disclosed. The photovoltaic power conditioning unit may include a non-electrolytic energy storage capacitor, a dc-to-dc converter having an... | 01/03/2012 |
| 8081497 | Converter station A converter station for connecting an AC system to a bipolar HVDC transmission line. A DC neutral arrangement includes first DC breakers enabling breaking of a first current path from the neutral bus of one pole to the neutral bus of the other pole at bipolar operat... | 12/20/2011 |
| 8014178 | Converter station A converter station for connecting an AC system to a bipolar HVDC transmission line. A DC neutral arrangement is provided with first DC breakers enabling breaking of a first current path from a neutral bus of one pole of the transmission line to a neutral bus of ano... | 09/06/2011 |
| 7969755 | Apparatus for electrical power transmission A device for the transmission of electrical energy includes at least one current converter. Each current converter has phase elements with respective arrangements of circuit elements that comprise at least two switchable power semiconductors each and at least two fr... | 06/28/2011 |
| 7848120 | Voltage-sourced HVDC system with modulation function A voltage-sourced High-Voltage Direct Current (HVDC) apparatus, which converts 3-phase AC voltage from a 3-phase AC power source into high voltage DC through a rectifier including switching elements, is provided. In the apparatus, a rectifier controller receives det... | 12/07/2010 |
| 7830679 | Transmission system A HVDC transmission system including at one end of a bipolar HVDC transmission line a converter station for connecting the transmission line to an AC system. The station has two converters and a DC neutral arrangement in common to the converters. The DC neutral arra... | 11/09/2010 |
| 7738267 | Systems and methods for common-mode voltage reduction in AC drives Control systems, methods and power conversion systems are presented for controlling common mode voltages in AC motor loads driven by inverter PWM control using switching sequences with only active vectors where a first vector of each switching sequence differs by on... | 06/15/2010 |
| 7710747 | Voltage-source inverter apparatus utilizing ripple voltage An inverter apparatus that can lengthen a lift span provides only a noise absorption film capacitor in a DC intermediate circuit between rectifying and inverter circuits, instead of a conventional electrolytic capacitor. In a voltage command generating unit, when a ... | 05/04/2010 |
| 7646617 | Method for controlling a direct voltage source and a voltage supply device The invention concerns a method for controlling a direct voltage source with a first direct voltage source (2) and a voltage monitoring device (24), which monitors an output voltage of the first direct voltage source (2) and acts upon a control ... | 01/12/2010 |
| 7633770 | Collection and transmission system A collection and transmission system includes: a system direct current (DC) link configured for carrying power from a source to a grid; and alternating current (AC) to DC power converter modules coupled in series to the system DC link on a source side of the system ... | 12/15/2009 |
| 7558087 | Multilevel AC/DC converter for traction applications A power supply system for railway traction applications including a multilevel AC/DC converter. The converter comprises a plurality of series-connected single-stage cycloconverters or direct AC frequency converters connected between an AC supply line and a traction ... | 07/07/2009 |
| 7439714 | Method for operation of a converter system The present invention relates to a method for operating a converter system of a wind turbine, wherein the converter system includes converter modules capable of converting electric power produced by a generator to electric power applicable to a utility grid. The con... | 10/21/2008 |
| 7416337 | Bag A bag, for e.g. collecting garbage or freezing foods, includes a thin, flexible material, e.g. plastic foil formed with an opening, which in its flat-laid state is bounded by two facing edges. A flexible stiffener made of plastic or a similar material is attached al... | 08/26/2008 |
| 7414870 | Inverter An inverter includes an intermediate circuit, inverter bridge branches downstream of the intermediate circuit for outputting a power signal, and a controller operable for individually turning on and off the inverter bridge branches. The controller may individually t... | 08/19/2008 |
| 7359223 | Power converter system and method A power converter system for supplying an output voltage is provided. The power converter system is adapted to operate in a normal mode and a fault mode. The system comprises a plurality of bridges and a plurality of transformers. The system further comprises a plur... | 04/15/2008 |
| 7358620 | Methods and apparatus for ride-through operation of a complementary device to a transient power source In accordance with certain exemplary embodiments, the present technique provides methods and apparatus for providing operating power to a complementary device to an induction device based uninterruptible power source (UPS) via a direct current (dc) bus. In one embod... | 04/15/2008 |
| 7336510 | Method and system for increasing load start-up capability of a DC-to-AC converter A power system for increasing a load start-up capability of a DC/AC converter includes a DC/AC converter, a processor coupled to the DC/AC converter and a memory subsystem coupled to the processor. The memory subsystem stores code that when executed by the processor... | 02/26/2008 |
| 7336052 | Device for powering a variable speed drive Variable speed drive comprising a main rectifier module (10) including thyristors (K1, K2, K3) to power a main continuous bus (15) from an external power network (5), an inverter module (30) delivering a variable cont... | 02/26/2008 |
| 7324360 | Power converter methods and apparatus for variable speed high power machines 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 parall... | 01/29/2008 |
| 7324314 | Disconnect switch with early break feature A disconnect switch that provides a simple and economical means for preventing the possibility of stray/surge current from damaging the solid state components of an inverter drive is provided. The disconnect switch includes early break auxiliary contact(s) that open... | 01/29/2008 |
| 7321500 | Electric power converter A voltage source converter for high power application containing a plurality of valves, each valve containing a plurality of extinguishable semiconducting elements, and a valve control unit containing a computer and a pulse-width modulator providing an executing con... | 01/22/2008 |
| 7317292 | AC motor control method and control device It is possible to control the DC intermediate voltage to be constant without using a device for returning regenerative resistance or regenerative energy to a power source and to safely continue operation of an AC motor even if an instantaneous stop occurs. An AC mot... | 01/08/2008 |
| 7317301 | Auxiliary power supply An auxiliary power supply equipment for a high voltage installation includes a power source at ground potential, a load circuit at high potential, and a transmission link for coupling the power source to the load circuit. The power source includes a high frequency v... | 01/08/2008 |
| 7305291 | Mobile energy management system A recreational vehicle includes a chassis having a living space, an electrical system for providing electrical power to the living space, an air conditioner for cooling the living space, a heater for heating the living space, and a plurality of appliances within the... | 12/04/2007 |
| 7304835 | Mainframe and power supply arrangement A mainframe and power supply arrangement is disclosed to include a mainframe, which has a base frame holding a DC power jack and connector modules, a circuit module, which includes a sliding carrier detachably slidably inserted into the base frame and a circuit boar... | 12/04/2007 |
| 7301248 | Control method for voltage boosting circuit A control method for a voltage boosting circuit adapted to be used in an uninterruptible power supply is proposed. The uninterruptible power supply includes a battery module and a voltage boosting circuit comprising a plurality of switch elements, in which the unint... | 11/27/2007 |
| 7286918 | Mobile energy management system A recreational vehicle includes a chassis having a living space, an electrical system for providing electrical power to the living space, an air conditioner for cooling the living space, a heater for heating the living space, and a plurality of appliances within the... | 10/23/2007 |
| 7277302 | 12-pulse converter including a filter choke incorporated in the rectifier The invention provides a 12-pulse converter comprising an autotransformer having a primary winding connected in a delta configuration and two secondary windings connected in star configurations, the two secondary windings being connected to two rectifier bridges tha... | 10/02/2007 |
| 7274576 | Power converter with reduced common mode voltage An improved power converter that produces reduced-levels of common-mode voltages, or even entirely eliminates such voltages, is disclosed herein, along with a method of reducing common-mode voltages. In at least some embodiments, the improved power converter is equi... | 09/25/2007 |
| 7274579 | Converter circuit and motor driving apparatus A converter circuit for converting an output voltage from an AC power supply includes a rectifier circuit for rectifying the output voltage of the AC power supply; first and second capacitors connected in series, for smoothing the output of the rectifier circuit; an... | 09/25/2007 |
| 7265960 | Trip coil drive circuit and electrical switching apparatus including the same A drive circuit, such as an electronic trip device, is for a shunt trip coil of a network protector. The drive circuit includes an alternating current input adapted to receive an alternating current voltage and a first half-wave rectifier adapted to provide a plural... | 09/04/2007 |
| 7259475 | Uninterruptible power supply for the backup of AC-power supply The present invention relates to an uninterruptible power supply, more specifically, to an uninterruptible power supply for the backup of AC-power supply which comprises an electric double layer capacitor as an energy storage device. The uninterruptible power supply... | 08/21/2007 |
| 7256516 | Battery charging system and method A charging system for simultaneously charging the batteries of a plurality of battery powered vehicles. The charging includes one or more DC-DC power converters having one or more charging ports configured to plug into the batteries. The DC-DC power converters are e... | 08/14/2007 |
| 7250794 | Voltage source converter A voltage source converter with a line-side diode rectifier, a load-side inverter with an electronic circuit, a power supply for the electronic circuit, and a slim DC link with a DC link capacitor is described. The slim DC link connects a DC output side of the line-... | 07/31/2007 |
| 7233082 | Interconnecting power generation system To provide an interconnecting power generation system which can detect an abnormality in the utility power supply and can be isolated from a utility power system and can prevent damage to a turbogenerator. An interconnecting power generation system comprises:... | 06/19/2007 |
| 7227331 | Safety interlock and protection circuit for permanent magnet motor drive A circuit for protecting against controller failure wherein the controller provides control signals for controlling a DC to AC inverter fed by a DC bus and driving a permanent magnet motor, the circuit comprising a first circuit for monitoring the DC bus voltage and... | 06/05/2007 |
