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7577007 |
Power converting apparatus
A power converting apparatus used as an active filter includes single-phase multiplex inverter unit for converting DC power into AC power and a control unit for controlling the single-phase...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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6930459 |
Method for reducing the influence of a DC current component in the load current of an asynchronous motor
A method with which the load current and thus the load moment of an asynchronous motor that is controlled via a phase-controlled two-phase thyristor power controller, can be easily influenced so as...
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6880168 |
Chat application for video game machine
The present invention allows users to open and join a chat by means of a simple procedure from a video game machine, the present invention includes creating an opening message for opening an...
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6867987 |
Multilevel inverter control schemes
A multilevel inverter control system having logic configured to substantially minimize and area between a target waveform and a step signal of a multilevel inverter.
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6621719 |
Converter with additional voltage addition or subtraction at the output
A circuit for transmitting real power from a DC voltage side to AC voltage-side connections has a first power converter ( 4 ) with load connections ( 5 ) connected in series with second power...
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6430066 |
Electric power system having series connected capacitor
An electric power system comprises a plurality of capacitors connected in series, a plurality of DC-AC conversion circuits converting each DC voltage of the plurality of capacitor to an AC signal...
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6201452 |
Systems and methods for converting a stream of complex numbers into a modulated radio power signal
Modulation systems and methods can modulate a stream of complex numbers representing a desired modulation of a radio signal by representing a real part of each of the complex numbers in a stream of...
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6169676 |
Invertor
An invertor having a plurality of invertor bridges which operate in parallel and whose output voltages are summed. The invertor bridges are driven with pulse duration modulation according to an...
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6151227 |
Controller for power converter
The controller for a power converter of the present invention: calculates the range number in which the voltage command vector for a multi-level converter is present; rotates the voltage command...
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6097615 |
Power waveform synthesis using bilateral devices
Waveform synthesizers represent an input waveform as a sequence of numerical codes in a number base, each numerical code comprising a plurality of digits ordered by place significance. A plurality...
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6052296 |
Power breaker
A power converter circuit arrangement which comprises a first power converter and at least one further power converter is specified. The power converters are connected to the DC voltage...
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6031738 |
DC bus voltage balancing and control in multilevel inverters
A multilevel inverter system having four or more levels of output voltage on each inverter output line. The voltage across each of three or more series connected DC bus capacitors is provided to an...
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5995391 |
Control arrangement for a multilevel convertor
A control arrangement for a multilevel convertor employs an AC reference signal which is locked to the AC system frequency and is compared with a number of DC threshold levels. Intersections of the...
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5949666 |
Staircase adaptive voltage generator circuit
A staircase adaptive voltage generator circuit comprising a first capacitor connected between a first voltage reference and an output operational amplifier, through first and second switches,...
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5852553 |
Harmonic neutralized voltage sourced inverter employing phase shifting interphase transformers
Sets of phase shifting interphase transformers are used to combine the outputs of six-pulse static inverter stages to generate harmonic neutralized outputs with higher pulse counts. The phase...
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5841645 |
Multi-level inverter with low loss snubbing circuits
A multi-level inverter, including an AC output terminal, at least four DC input terminals with different potentials having a first DC input terminal with a maximum potential and a second DC input...
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5805437 |
Power electronic circuit arrangement having plural power converters
A power electronic circuit arrangement which comprises a first power converter is specified. A second power converter is connected between the load terminals of the first power converter and a...
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5801936 |
Semiconductor module for a power conversion device
An inverter device includes plural modules, each module being formed by a series circuit having a parallel circuit of a first switching device and a first diode, and a parallel circuit of a second...
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5784267 |
Quasi-sine wave and stepped square wave AC to AC converter
A switched AC to AC converter circuit comprises a rectifying circuit, which generates a rectified output signal from an alternating input voltage signal, and a switching circuit for controllably...
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5751138 |
Active power conditioner for reactive and harmonic compensation having PWM and stepped-wave inverters
An active power quality conditioner for compensating reactive power and harmonic distortion in power systems. A pulse width modulated (PWM) inverter (70) for each phase is controlled to produce a...
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5731970 |
Power conversion device and semiconductor module suitable for use in the device
An inverter device includes plural modules, each module being formed by a series circuit having a parallel circuit of a first switching device and a first diode, and a parallel circuit of a second...
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5682302 |
Adaptable power converter applying digitized-wave-generation for integrated circuit implementation
A power invertor system for converting a direct current (DC) input voltage to an alternate current (AC) output voltage with an output analog wave-shape. The power invertor system includes a...
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5657214 |
Stepped waveform PWM inverter
An inverter for converting DC power into AC power includes first and second subinverters having a plurality of controllable switches and three-phase outputs coupled to a summing transformer having...
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5652701 |
Inverter operation command apparatus
An inverter operation command apparatus having increase and decrease keys which, when operated according to predetermined requirements, allows the frequency to be set quickly, requires only the...
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5610807 |
Power converting system with a plurality of charging capacitors
A power converting system rendering an applied voltage to a load to be a continuous voltage waveform, wherein a plurality of capacitors are charged so that their terminal voltages will reach...
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5559686 |
Stepped waveform inverter control
A stepped waveform inverter and control therefor utilizes the inverter itself as a divide-by-N counter in a phase-locked loop to assure precise control over the output phase and frequency of the...
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5495403 |
Stepped-waveform power converter utilizing a summing transformer and a single inverter bridge
A summing transformer includes first and second sets of primary windings and first and second sets of secondary windings. The primary windings of the first set are connected in a wye configuration...
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5483433 |
Voltage control circuit for a multiple stage DC power supply, and applications thereof
A voltage controller capable of generating a staircase voltage is made up of a plurality of energy storage devices series connected with respective solid state switch devices. The solid state...
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5459655 |
Neutral-point clamped inverter device using semiconductor modules
An inverter device includes plural modules, each module being formed by a series circuit having a parallel circuit of a first switching device and a first diode, and a parallel circuit of a second...
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5446643 |
Harmonic blocking converter system
A harmonic blocking converter system for converting power between an AC source and a DC source includes a harmonic blocking transformer and a converter which generates undesirable harmonic currents...
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5442537 |
Method for setting operation constants in an inverter device
A method for setting a plurality of operation constants in an inverter device to control variably the speed of an induction motor, the method which changes a value representing the operation...
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5438503 |
Slew rate control in a multi-level switch
This invention employs timing circuitry for each voltage source in a multilevel power supply for an amplifier to control the change in voltage outputted from the associated voltage source over time...
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5373433 |
Power inverter for generating voltage regulated sine wave replica
A power inverter formed by several transformers having their secondary windings wired in series and their primary windings connected to respective switching bridges. The turns ratios of each of the...
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5355297 |
Three-level three-phase inverter apparatus
A three-level three-phase inverter apparatus operating on a proposed pulse width modulation method whereby good output voltages are obtained free of the effects of the minimum pulse width...
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5355296 |
Switching converter and summing transformer for use therein
A switching converter includes first and second controllable switches, a power source coupled to the switches and a closed flux path. First and second primary windings are mutually inductively...
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5339235 |
Fault compensating multi-step wave inverter
A multi-step, alternating current power supply that provides for a failed-operation redundancy safety system that compensates for a short-circuited power switch and maintains an AC regulated output...
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5337227 |
Harmonic neutralization of static inverters by successive stagger
Quasi-harmonic neutralized inverter systems are provided with interphase transformers connected in a waffle tree configuration and each having a pair of inputs for receiving staggered voltage...
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5317498 |
Electrical power generation system
An electrical power generation system for generating controlled AC output including a generator for converting mechanical input into variable frequency AC, a rectifier for rectifying the AC into DC...
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5301098 |
Feedforward inverter phase control
An inverter system for inverting variable input DC and providing therefrom controlled output AC including a feedforward sensor for sensing a variable parameter of the input DC, a feedback AC sensor...
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5282125 |
Power generation system with soft-start circuit
Control pulses having a first frequency are supplied to the switches of an inverter by a controller. During initial operation of the inverter, however, a softstart circuit supplied pulses to the...
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5276603 |
Sixteen level power supply with asynchronous controller
A sixteen level power supply including four voltage sources having stepped voltage values. The voltage sources are controlled by an electronic switch assembly and may be switched into series...
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5239454 |
Stepped-waveform inverter utilizing main and auxiliary subinverters
An inverter for converting DC power into AC power includes first and second controllable switches which are alternately operated to produce first and second AC waveforms which are combined to form...
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