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| Number | Title | Issue Date |
| 8159845 | Current-sharing power supply apparatus A current-sharing power supply apparatus is applied to regulate voltage level of an input DC voltage, and the regulated DC voltage is stabilized in a predetermined voltage to be used on rear-end circuits. The current-sharing power supply apparatus includes a square-... | 04/17/2012 |
| 8144491 | Cascaded flying capacitor modular high voltage inverters A high voltage inverter is provided which includes a plurality of k-level flying capacitor H bridge modules, k being greater than 2, each having a positive dc terminal, a negative dc terminal, and two ac terminals, a connecting unit for connecting said ac terminals ... | 03/27/2012 |
| 8130518 | Multiphase grid synchronized regulated current source inverter systems Electric power from typically unstable multiple dc sources is converted to ac electric power of suitable quality for injection into an electric power grid. Conversion is accomplished by current regulation of the output from the dc sources to the input of each one of... | 03/06/2012 |
| 8050066 | MISFET with capacitors The present invention aims to enhance the reliability of a semiconductor device having first through fourth capacitive elements. The first through fourth capacitive elements are disposed over a semiconductor substrate. A series circuit of the first and second capaci... | 11/01/2011 |
| 8031495 | Prediction scheme for step wave power converter and inductive inverter topology A step wave power converter comprises multiple different bridge circuits configured to convert DC voltage inputs into AC voltage outputs. A controller is configured to estimate an average voltage output from the multiple different bridge circuits for controlling the... | 10/04/2011 |
| 8018746 | Parallel inverter system A parallel inverter system needs neither a dedicated line for synchronizing common portions nor switching operations, and includes a plurality of inverter units operating in parallel. An inverter control circuit of each inverter unit includes a sinusoidal signal gen... | 09/13/2011 |
| 8009449 | DC-to-AC power inverter and methods Embodiments of the invention relate generally to semiconductors for power generation and conversion applications, and more particularly, to devices, integrated circuits, substrates, and methods to convert direct current (“DC”) voltage signals to alternating curr... | 08/30/2011 |
| 7990743 | System and method for decreasing solar collector system losses A solar farm system is provided that is configured for reducing electrical loss. The solar farm system includes a plurality of PV arrays coupled to inverters and a collector system including a conductor or network of conductors. The collector system also includes a ... | 08/02/2011 |
| 7929325 | High efficiency, multi-source photovoltaic inverter A photovoltaic (PV) inverter system operates continuously in a buck converter mode to generate a sum of full wave rectified sine wave currents at a current node common to a plurality of buck converters in response to a plurality of full wave rectified sine wave curr... | 04/19/2011 |
| 7929326 | Distributed multiphase converters A direct current to pulse amplitude modulated (“PAM”) current converter, denominated a “PAMCC”, is connected to an individual source of direct current. The PAMCC receives direct current and provides pulse amplitude modulated current at its output. The pulses... | 04/19/2011 |
| 7903438 | DC-AC converter with fast response speed An exemplary direct current to alternating current converter includes a pulse width modulator having a plurality of pulse signal outputs that can provide a plurality of pulse signals, a driving circuit having a plurality of switching units, and a transformation circ... | 03/08/2011 |
| 7859871 | Method for controlling inverters The invention relates to a method for controlling the voltage and power of several HF inverters (2), connected in parallel at the output, of an electrically isolated inverter assembly as well as for distributing the load to these HF inverters (2) each ... | 12/28/2010 |
| 7830687 | Adaptive power electronics interface for hybrid energy systems An adaptive hybrid energy system is provided. The system includes a first DC energy source that generates a first DC output by converting a first type of energy into an electrical output. Additionally, the system includes at least a second DC energy source that gene... | 11/09/2010 |
| 7760525 | Voltage regulator A regulator for converting energy from an input source to a voltage of an output. The regulator comprising at least two conduction switches to conduct energy from the input source to the output. Each of the conduction switches operated at approximately 50% duty cycl... | 07/20/2010 |
| 7729144 | DC/DC power conversion device A DC/DC power conversion device with smoothing capacitors including three column circuits share the smoothing capacitors to be connected in parallel, each column circuit have a plurality of circuits connected in series where two MOSFETs are connected in series betwe... | 06/01/2010 |
| 7719865 | Power conversion apparatus In a power conversion apparatus that boosts a solar light voltage, converts it to AC and supplies AC power to a load or system, power loss is reduced and efficiency is improved. An inverter unit, in which AC sides of three single-phase inverters receive DC power fro... | 05/18/2010 |
| 7710752 | Transformerless utility-grid-interactive inverter An electrical DC-to-AC power conversion apparatus is disclosed that is primarily intended for use with solar photovoltaic sources in electric utility grid-interactive applications. The invention improves the conversion efficiency and lowers the cost of DC-to-AC inve... | 05/04/2010 |
| 7656690 | Voltage conversion device and computer-readable recording medium with program recorded thereon for computer to execute control of voltage conversion by voltage conversion device A control device calculates a voltage command value of a voltage step-up converter based on a torque command value and a motor revolution number and calculates the on-duty of an NPN transistor based on the calculated voltage command value and a DC voltage from a vol... | 02/02/2010 |
| 7656689 | Power converter and control method for a power converter using serially-connected DC power sources A control method for a power converter capable of reducing overall volume of a system and energy loss by using a plurality of power sources and distributing loads to them without a DCDC converter. The power converter has DC power sources and poles formed by connecti... | 02/02/2010 |
| 7602626 | Power conversion apparatus In a power conversion apparatus that boosts a solar light voltage, converts it to AC and supplies AC power to a load or system, a second inverter is connected in series to one of two terminals on the AC side of a first inverter that uses, as its DC source, a DC volt... | 10/13/2009 |
| 7596007 | Multiphase DC to DC converter A multiphase DC to DC converter includes an input, an output, at least first and second converters, an inductor, an output capacitor, and a drive circuit. The drive circuit is configured for switching the first and second converters with a predetermined phase shift ... | 09/29/2009 |
| 7596008 | Power conversion apparatus A power conversion apparatus includes a first single-phase inverter that uses as a DC power source a first DC voltage that is boosted from a solar light voltage by a boosting chopper circuit. The first single-phase inverter is arranged between two single-phase inver... | 09/29/2009 |
| 7586768 | Electric power conversion apparatus for plural DC voltage sources and an AC electrical load An electric power conversion apparatus includes a power converter connected to at least a first DC voltage source, a second DC voltage source and an AC electric motor. A control unit controls the power converter to generate a first PWM pulse train for supplying a fi... | 09/08/2009 |
| 7577006 | Non-linear droop control system and method for isochronous frequency operation Non-linear frequency droop control for isochronous frequency operation of parallel inverters includes generating a droop constant corresponding to the power level of the given inverter for maintaining the predetermined frequency range of the given inverter; generati... | 08/18/2009 |
| 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 multiplex inverter unit. The single-phase multiplex inverter unit includes a... | 08/18/2009 |
| 7558092 | Switching power supply unit A switching power supply unit is provided, in which a convertible voltage range can be more widened. A transformer having four windings at a high-voltage side, the windings having the number of turns equal to one another, and four inductors are provided in correspon... | 07/07/2009 |
| 7535738 | Method and apparatus including multi-drive configurations for medium voltage loads A method and apparatus for converting X phase intermediate voltages on X intermediate lines to output voltage for driving a single three phase load, the apparatus comprising a positive DC bus, a negative DC bus and first and second three phase drives that each inclu... | 05/19/2009 |
| 7522435 | Power supply converter/s with controller/s responsive to voltage, current, and power Each of power supply units in a power supply system according to the present invention includes a power supply module, a voltage increase/decrease circuit for increasing the voltage across the power supply module and outputting the increased voltage to a load, and a... | 04/21/2009 |
| 7483281 | Multi-channel power converter with switching frequency modulation circuit for power saving The present invention provides a control circuit for a multi-channel power converter to save power at light load. The control circuit comprises a modulation circuit and an oscillation circuit to modulate the switching frequency of switching signals for power saving.... | 01/27/2009 |
| 7450406 | Power supply arrangement A power supply arrangement (1) has a first input for connecting to a first power source, at least one second input for connecting to at least one second power source and an output for connecting to a load. The arrangement (1) comprises at least two par... | 11/11/2008 |
| 7443129 | Quenching device for a converter bridge with line regeneration There is described a method for controlling a quenching device for a converter bridge with line regeneration, whereby the converter bridge controlled by a network-timed control circuit by ignition pulses is connected with its three inputs to the phases of a three-ph... | 10/28/2008 |
| 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 |
| 7433212 | System linking apparatus for generated electric power A system linking apparatus for generated electric power which may be made smaller and more efficient. The system linking apparatus is intended for connecting an electric power system to an output of a power generator through a linking inverter (PWM inverter). The sy... | 10/07/2008 |
| 7425806 | System and method for controlling a variable speed drive A variable speed drive is provided having a converter to convert an AC voltage to a DC voltage, a DC link to filter and store energy from the converter, and a plurality of inverters. Each inverter is configured to convert a DC voltage to an AC voltage and is electri... | 09/16/2008 |
| 7420826 | Parallel inverters and controlling method thereof Parallel inverters without any communication buses and the controlling method thereof are provided. The parallel inverters are controlled by an instant voltage. Each inverter includes an output voltage waveform controller and a load-sharing controller. The output vo... | 09/02/2008 |
| 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 |
| 7414869 | Switching power supply unit A switching power supply unit is provided, in which widening of the input voltage range can be achieved while suppressing production of a surge current. A transformer having two primary windings having the number of turns equal to each other, and two inductors are p... | 08/19/2008 |
| 7394232 | Interleaved switching converters in ring configuration A switched mode power supply assembly that has a plurality of power supply modules cyclically coupled to each other. Each power supply module has a synchronization control module for generating a synchronization control signal for a next neighboring module and for r... | 07/01/2008 |
| 7388766 | Harmonic control and regulation system for harmonic neutralized frequency changer A control and regulation system for use with a harmonic neutralization frequency changer system. In the generalized frequency changer system, a direct converter frequency changer is used to convert bulk power, but unwanted harmonics are introduced. Input and output ... | 06/17/2008 |
| 7378758 | Parallel inverter system The invention relates to a parallel inverter system, in which each inverter includes a synchronized square wave generator, a voltage given generator, a voltage regulating unit and a power amplifier unit. All of the above components are connected in parallel. The out... | 05/27/2008 |
