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| Number | Title | Issue Date |
| 8144490 | Operation of a three level converter A method of operating a three level converter includes controlling the output voltage of the converter when a DC link voltage of the three level converter is lower than one-half of a rated DC link voltage of the converter by, for each leg of the converter, alternate... | 03/27/2012 |
| 7800926 | Method of controlling a three level converter A system and method are disclosed for controlling an inverter to provide an alternating inverter voltage to a load for a transition in which a change in active power (P) and/or reactive power (Q) within a transition time (Ttr) is carried out. The method i... | 09/21/2010 |
| 7414866 | Method for smoothing input current to a power delivery system having regeneration capability A method for smoothing input current to a power delivery system having regeneration capability. The method comprises evaluating input current to an input converter of the power delivery system for a first fundamental cycle, and shifting a window relative to a wavefo... | 08/19/2008 |
| 7375489 | Apparatus for generating sine waves of electromotive force, rotary switch using the apparatus, and generators using the rotary switch An apparatus generates sine waves of electromotive force (i.e. alternating current) from a battery. The battery includes a given number of cells connected in series. A stator and commutator is formed by a multiple of segments. Each of the segments is connected in se... | 05/20/2008 |
| 7369819 | Digital amplitude modulation transmitter with pulse width modulating RF drive A digital amplitude modulation (AM) transmitter with pulse width modulating RF drive is presented. A plurality of RF amplifiers, each, when turned on, amplifies an applied RF drive signal by the same amount to provide a unit step RF output. An encoder supplies turn-... | 05/06/2008 |
| 7313008 | Converter circuit for producing low harmonics A converter circuit is specified for at least one phase (R, Y, B), which converter circuit has a first switching group system which is provided for each phase (R, Y, B) and has a first main switching group which is formed by a power semiconductor switch and by a cap... | 12/25/2007 |
| 7307400 | Inverter operation with over-modulation A variable frequency drive including a plurality of power cells that are configured as three phases of series-connected cells to deliver power to a load. The drive is operated to increase the output voltage of each power cell using overmodulation. ... | 12/11/2007 |
| 7282871 | Backlight inverter for inductively detecting current A backlight inverter using electromagnetic induction and full-wave rectification at a second side of a main transformer includes a drive unit for generating a first voltage and a main transformer having first and second coils. The main transformer converts the first... | 10/16/2007 |
| 7277304 | Multiple inverter system with single controller and related operating method A multiple DC-to-AC inverter system, which is suitable for an electric or hybrid vehicle application, includes a plurality of inverters controlled by a single controller. One example embodiment includes four three-phase inverters driving one six-phase motor, where t... | 10/02/2007 |
| 7271573 | Low loss DC/DC converter including a multi-level controller that applies a monotonic sequence of voltage levels A direct current to direct current converter includes first and second switches to output voltages on first and second output terminals in response to appropriate turn-on voltages at first and second control terminals. The first control terminal may selectively comm... | 09/18/2007 |
| 7269036 | Method and apparatus for adjusting wakeup time in electrical power converter systems and transformer isolation An electrical power converter system adjusts a wakeup voltage periodically, to permit earlier connection and/or operation, to increase performance. The electrical power converter system selects between a mathematically adjusted wakeup voltage based on at least one p... | 09/11/2007 |
| 7253540 | Method for operating a parallel arrangement of semiconductor power switches The invention relates to a method for statically balancing the loading of power semiconductor switches (S1, S2, S3) in a parallel circuit (1). To achieve this in prior art, switching instants of individual switches (S1 | 08/07/2007 |
| 7199535 | Doubled-ended inverter drive system topology for a hybrid vehicle A double-ended inverter system for a vehicle having a load, a first energy source, and a first inverter system coupled to the first energy source and adapted to drive the load. The double-ended inverter system further having a secondary energy source, a second capac... | 04/03/2007 |
| 7196919 | Neutral point controller, method of controlling and rectifier system employing the controller and the method The present invention provides a neutral point controller for use with a three level rectifier. In one embodiment, the neutral point controller includes a primary drive circuit configured to provide primary drive signals for the three level rectifier thereby establi... | 03/27/2007 |
| 7190143 | Pulse width modulation (PWM) rectifier with variable switching frequency A method for controlling a device including a plurality of switching devices operated in accordance with a pulse width modulation technique includes receiving a reference voltage signal associated with a first pair of the switching devices. A switching signal is gen... | 03/13/2007 |
| 7180270 | Frequency converter for high-speed generators The present invention relates to a method and to a device for adapting the alternating current generated by a generator (1) and the alternating voltage generated by a generator (1) to a grid (8), whereby the generator (1) has at least one... | 02/20/2007 |
| 7170261 | Generator with dual cycloconverter for 120/240 VAC operation A generator system has two modes of operation, such as 120 VAC and 240/120 VAC. The generator system has a permanent magnet generator with two independent sets of windings that each generate a three phase AC voltage. One three phase AC voltage is coupled to a first ... | 01/30/2007 |
| 7161342 | Low loss DC/DC converter A direct current to direct current converter includes first and second switches to output voltages on first and second output terminals in response to appropriate turn-on voltages at first and second control terminals. The first control terminal may selectively comm... | 01/09/2007 |
| 7148673 | Method and apparatus including low loss DC/DC converter A direct current to direct current converter includes first and second switches to output voltages on first and second output terminals in response to appropriate turn-on voltages at first and second control terminals. The first control terminal may selectively comm... | 12/12/2006 |
| 7145266 | Parallel-connected inverters with separate controllers having impedance current regulators A control system (20) for a power converter (22) designed to convert DC power from a source (30) such as a battery, flywheel or fuel cell into AC power. The control system includes an impedance current regulator (106) for providing an imp... | 12/05/2006 |
| 7145268 | Fault-tolerant three-level inverter A method for driving a neutral point clamped three-level inverter is provided. In one exemplary embodiment, DC current is received at a neutral point-clamped three-level inverter. The inverter has a plurality of nodes including first, second and third output nodes. ... | 12/05/2006 |
| 7102331 | Generator with dual cycloconverter for 120/240 VAC operation A generator system in accordance with the invention has two modes of operation, such as 120 VAC and 240/120 VAC modes of operation. The generator system has a permanent magnet generator with two independent sets of windings that each generate a three phase AC voltag... | 09/05/2006 |
| 7102343 | Methods and systems having multiple cooperating transformers Disclosed are methods, systems, and devices that include a power source having a first voltage having a first frequency, a power-consuming load(s), and a first transformer set comprising a delta-delta transformer and a first voltage controller coupled in series ther... | 09/05/2006 |
| 7102321 | Control method for peak power delivery with limited DC-bus voltage A method for driving a neutral point-clamped multi-level voltage source inverter supplying a synchronous motor is provided. A DC current is received at a neutral point-clamped multi-level voltage source inverter. The inverter has first, second, and third output node... | 09/05/2006 |
| 7095138 | Controller for plural supplies driving single load A controller is disclosed for determining that the currents from the two AC power sources are correctly phased. Required circuitry can be disposed within a housing from which extend power cables having single phase 240V AC, 50 A male connector plugs connected at rem... | 08/22/2006 |
| 7091625 | Home-use fuel cell system During a time zone where a power demand is smaller than an average value of the entire power demands of homes, an excess portion obtained by subtracting a power demand from a base power portion supplied by PEFC (1) is charged in a capacitor (7) and a l... | 08/15/2006 |
| 7053676 | Circuit arrangement for generating a signal having a specific waveform with an adjustable voltage level A circuit arrangement for generating specific waveforms includes a controllable voltage transformer circuit for generating an output signal (VOUT) with a specific waveform, which increases the voltage of its output signal depending on a first control sign... | 05/30/2006 |
| 7050279 | Method and apparatus for high impedance grounding of medium voltage AC drives To protect people and equipment, three-phase AC drives need to be properly grounded, and ground faults need to be quickly detected. Conventional methods of detecting ground faults are affected by external factors that reduce their sensitivity. As an improvement on c... | 05/23/2006 |
| 7049777 | Motor control device and motor control method A motor control device is provided with a neutral point shift section. The neutral point shift section shifts a neutral point (command neutral point) of phase voltage commands so that the values of the phase voltage commands after the shifting of the neutral point c... | 05/23/2006 |
| 7042110 | Variable speed distributed drive train wind turbine system A variable speed wind turbine employing a rotor connected to a multiplicity of synchronous generators with wound field or permanent magnet rotors. A passive rectifier and an inverter are used for power transfer back to the grid. A Turbine Control Unit (TCU) commands... | 05/09/2006 |
| 7030593 | Multiple path variable speed constant frequency device having automatic power path selection capability The present invention relates to variable speed constant frequency (VSCF) devices and methods for maximizing engine generator efficiency. In one embodiment, a VSCF device may include at least two paths for conducting power to the load. One path, a line inductor path... | 04/18/2006 |
| 6977480 | Power supply unit, distributed power supply system and electric vehicle loaded therewith A power supply unit, a distributed power supply system and an electric vehicle loaded therewith, capable of charge/discharge operation are disclosed. A first cell group is connected in parallel to a second cell group in which the electrolytic solution can be electro... | 12/20/2005 |
| 6977823 | Switch power supply apparatus The present invention provides a power supply apparatus with a plurality of digital control units. Each digital control unit is used to control an independent output terminal for outputting a stable output voltage. The output voltage is not fed back to the primary s... | 12/20/2005 |
| 6972976 | Compensation method for a voltage unbalance The invention relates to a method for compensating for a voltage unbalance in an electrical network, which is fed by using an apparatus based on controlling a flux linkage vector or a voltage vector. Concerning the apparatus based on controlling the flux linkage vec... | 12/06/2005 |
| 6969967 | Multi-level dc bus inverter for providing sinusoidal and PWM electrical machine voltages A circuit for controlling an ac machine comprises a full bridge network of commutation switches which are connected to supply current for a corresponding voltage phase to the stator windings, a plurality of diodes, each in parallel connection to a respective one of ... | 11/29/2005 |
| 6967559 | Transformer for high-voltage X-ray generator A power supply for a device which has a load, comprising a first resonant generator and a second resonant generator, coupled in parallel, each generator having a phase output. The power supply further comprises a control circuit coupled to the first and second gener... | 11/22/2005 |
| 6954004 | Doubly fed induction machine An electro-mechanical energy conversion system coupled between an energy source and an energy load including an energy converter device having a doubly fed induction machine coupled between the energy source and the energy load to convert the energy from the energy ... | 10/11/2005 |
| 6943531 | Portable power supply incorporating a generator driven by an engine A portable power supply includes an engine-driven generator that generates a first AC power. A rectifier rectifies the first AC power to a first DC power. A DC/DC converter converts a second DC power from a storage unit to a third DC power. A controller selectively ... | 09/13/2005 |
| 6939300 | Multiple level transmitter and method of transmitting Transmitters for generating multilevel transmit waveforms for medical diagnostic ultrasound are provided. Voltages from a plurality of sources are superposed or summed. Switches control the amplitude and polarity of the summed voltages so that a transmit waveform ha... | 09/06/2005 |
| 6940735 | Power converter system A power converter system advantageously employs a modular, bi-directionally symmetrical power converter assembly in a readily customizable configuration to interconnect a direct current power source to a three-phase alternating power grid. Connections external to th... | 09/06/2005 |
