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| Number | Title | Issue Date |
| 8179701 | Variable frequency drive soft charge circuit A variable frequency drive comprises a diode rectifier receiving multiphase AC power and converting the AC power to DC power. An inverter receives DC power and converts the DC power to AC power to drive a load. A link circuit is connected between the diode rectifier... | 05/15/2012 |
| 8120932 | Low voltage ride through A system for connecting a wind turbine generator to a utility power network includes a first power converter that converts an AC signal from the wind turbine generator to a DC signal and supplies a controlled amount of reactive current to the wind turbine generator.... | 02/21/2012 |
| 8111528 | DC to AC inverter A DC to AC inverter has a DC power input port, a buck converter, a buck/boost converter, an output filter and an AC output port. The DC power input port has a positive input terminal and a negative input terminal, both connected to a DC source. The AC output port is... | 02/07/2012 |
| 8107267 | Systems and methods for common-mode voltage reduction in fully regenerative AC drives Control systems, methods and fully regenerative power conversion systems are presented for mitigating common mode voltages in AC loads by employing inverter and/or active rectifier PWM control using switching sequences with only active vectors where a first vector o... | 01/31/2012 |
| 8045346 | Modular multi-pulse transformer rectifier for use in asymmetric multi-level power converter In one embodiment, the present invention includes a system having multiple modular transformers each including a primary winding coupled to an input power source and phase-shifted secondary windings each coupled to a power cell. The system further includes different... | 10/25/2011 |
| 8014179 | Multi output voltage regulation of a synchronous generator in a power system In typical commercial/aerospace applications, synchronous generators provide power to both the high voltage and the low voltage loads. This disclosure describes a method of regulating the output voltage for all of the loads. ... | 09/06/2011 |
| 7983060 | Method for reducing the reactive power requirement of a fundamental frequency clocked power supply side converter under no load and with low motor loading The invention relates to a method for reducing the idle current requirement of a base frequency clocked supply side converter (1) on idle and with low motor loads, provided with controllable semiconductors (T1,T2,T3,T4, T5,T... | 07/19/2011 |
| 7952896 | Power conversion architecture with zero common mode voltage A controller for a power conversion system reduces common-mode voltage generated by the power conversion system by imposing a constraint on the control signals applied to the power conversion system. The power conversion system includes a plurality of switching devi... | 05/31/2011 |
| 7944717 | Power converter apparatus and power converter apparatus control method A converter section converts a three-phase ac input voltage into a dc voltage, and an inverter section converts the dc voltage converted by the converter section into a prescribed three-phase ac output voltage. The converter section converts the three-phase ac input... | 05/17/2011 |
| 7920392 | Dynamic voltage sag correction A voltage sag correction device includes an input terminal adapted to receive a first operating signal having a line-to-neutral voltage. The first operating signal is provided to a load through an output terminal. A regulator module includes a rectifying device adap... | 04/05/2011 |
| 7907427 | Inverter The inverter comprises a diode bridge (21) that rectifies an inputted three-phase AC voltage into a DC voltage, an inverter section (22) that converts the DC voltage converted by the diode bridge (21) into an AC voltage and outputs the resulting... | 03/15/2011 |
| 7881078 | Twelve-pulse HVDC transmission A device for transmitting electric power between alternating voltage networks includes converters interconnected by direct current lines and provided each with several six-pulse conversion bridges. The six-pulse conversion bridges of one same converter are capable o... | 02/01/2011 |
| 7869232 | Electric power converter suppressing output voltage variation due to input voltage fluctuation An electric power converter apparatus having a function of converting a power source voltage into an AC voltage having an arbitrary frequency and maintaining an output voltage constant even on the power source variation, in which the electric power converter apparat... | 01/11/2011 |
| 7855900 | Method and arrangement in connection with half-controlled network bridge A method and an arrangement are provided for controlling phase-specific thyristors of a half-controlled network bridge. The method includes identifying continuously a thyristor to be controlled on the basis of magnitudes of supplying phase voltages, controlling the ... | 12/21/2010 |
| 7848121 | Advanced matrix converter and method for operation A matrix converter may be provided with AC switches that comprise bi-directional sets of semiconductor switches that are gated with a common gating link. A low loss diode-bridge based snubber may facilitate introduction of time delay between sequential operations of... | 12/07/2010 |
| 7839663 | Converter and power converter that becomes it with the converter A converter includes a converter circuit 1 having a plurality of bridge-connected semiconductor switching devices for converting AC power into DC power, a smoothing condenser connected in parallel to the DC side of the converter circuit and a current detector... | 11/23/2010 |
| 7830681 | Modular multi-pulse transformer rectifier for use in asymmetric multi-level power converter In one embodiment, the present invention includes a system having multiple modular transformers each including a phase-shifted primary winding coupled to an input power source and phase-shifted secondary windings each coupled to a power cell. The system further incl... | 11/09/2010 |
| 7830680 | Power unit The invention makes it possible to secure a maximum output within the capacity range of an electrical power source by preventing an output from being cut by a protective function of a converter at the time of a temporary overload. A bidirectional DC-DC converter ... | 11/09/2010 |
| 7796410 | Switching power supply unit Provided is a switching power supply unit being able to perform voltage conversion between two DC power supplies, and perform appropriate charge operation based on an inputted AC voltage. When a main battery is preferentially charged, an SW control section performs ... | 09/14/2010 |
| 7791911 | Inverter device which maintains voltage during input voltage drop An inverter device includes a converter circuit that rectifies a first alternating current output from a power supply to generate a rectified current, a capacitor that stores therein the rectified current and outputs a direct current based on the rectified current, ... | 09/07/2010 |
| 7787266 | Method for operating a frequency converter of a generator The method relates to the operation of a frequency converter of a generator in particular of a wind energy turbine, in the event of a substantial grid voltage drop, wherein the frequency converter (10) comprises an AC/DC converter (20), to be connected... | 08/31/2010 |
| 7742321 | Measurement of the current of a frequency converter A method and an apparatus for measuring the output currents of a frequency converter, preferably a vector-controlled frequency converter, which comprises a mains bridge (10) connectable to an alternating-current network and a load bridge (11) connectab... | 06/22/2010 |
| 7729138 | Control method for direct-current transmission In a method for controlling a rectifier and an inverter, which are connected together by a direct current circuit, a measuring direct current voltage and respectively, a measuring direct current are measured at at least one measuring point of the direct current circ... | 06/01/2010 |
| 7724548 | Control methods for pulse width modulation (PWM) A method of controlling a power converter is used to interface to a power grid or supply network operating at a frequency (Fnet) that is nominally fixed (say at 50 Hz, for example) but which can be varied as a way of controlling power imbalanced within the network a... | 05/25/2010 |
| 7710748 | AC/DC converter comprising plural converters in cascade The present invention relates to an AC/DC converter (1) of the type having an AC/DC conversion stage (2) and a DC/DC conversion stage (3), the AC/DC conversion stage (2) comprising an input filter stage (4), an input rectifier stag... | 05/04/2010 |
| 7688603 | Arrangement for monitoring a frequency converter An arrangement and method for monitoring a frequency converter, the frequency converter being a voltage-controlled PWM frequency converter provided with a control unit and having an uncontrolled or a main-frequency controlled main bridge connectable to an alternatin... | 03/30/2010 |
| 7684218 | Method and device for transforming and regulating a voltage signal The present invention is generally directed to an efficient voltage transforming and regulating device based on a High Frequency (HF) transformer and a HF Electromagnetic Voltage Regulator (HFEVR) serially connected to the transformer's coil(s). The transforming and... | 03/23/2010 |
| 7679941 | Power conversion system with galvanically isolated high frequency link A power conversion system has a three-phase AC input, where each AC input phase is linked to a string of cascaded single-phase AC-DC converters placed in series with a three-phase AC-DC converter. Each single-phase AC-DC converter in one embodiment includes a silico... | 03/16/2010 |
| 7633771 | Method and circuit for controlling a rectifier A method for controlling a rectifier, connected to an AC power network, of a drive converter which is provided with a load-end pulse-controlled rectifier is disclosed. An electronically controlled switch is electrically connected in parallel to every diode of the re... | 12/15/2009 |
| 7619907 | DC/DC power conversion device A DC/DC power conversion device includes n-stage circuits comprised of an inverter circuit for driving which is connected between positive terminals and negative terminals of smoothing capacitors, and a rectifier circuit which is connected between positive terminals... | 11/17/2009 |
| 7602622 | Compensator with filter for use with a three-phase drive powering a one-phase load The present invention is directed to a compensator-filter circuit for reducing low order current harmonics in a three-phase drive system driving a single-phase load, the three-phase drive system including a three-phase source voltage connected to a rectifier system ... | 10/13/2009 |
| 7586763 | Electric power converter circuit An electric power converter circuit includes a rectifying circuit having diodes, a coil, and a full-bridge circuit including switching devices, which are connected in cascade to an AC power supply 1, to convert an AC to a DC and to further convert the concert... | 09/08/2009 |
| 7567446 | Power conversion apparatus including a rectifier circuit and an inverter circuit A power conversion apparatus is disclosed. In the case where a coil is arranged in a power module, the circuit system between the ends of the coil in the power module, regardless of where the coil is located, is structurally isolated and insulated from each other. T... | 07/28/2009 |
| 7545655 | Inverter apparatus An inverter apparatus in which a control power source connected to a microcomputer or a peripheral circuit included in at least one of an inverter main body, a built-in option, and a parameter unit is provided in the inverter main body. The apparatus has an external... | 06/09/2009 |
| 7539029 | 3-phase solar converter circuit and method A conversion circuit for converting solar power into an alternating 3-phase mains comprises a converter for converting the power from a solar cell into an unipolar converter output voltage provided between a first and a second converter output terminal of the conver... | 05/26/2009 |
| 7535737 | AC/AC multiple-phase power converter configured to be mounted on a substrate An arrangement is provided a converter, an inverter, a smoothing condenser connected between the converter and the inverter, and reactors each connected between the connection point of each pair of IGBT switches of the converter and the output terminal of each phase... | 05/19/2009 |
| 7525824 | Method to control a frequency converter A method for the control of a static frequency converter, in which an alternating voltage provided by a generator with a first frequency is first rectified in a switched rectifier, and in which the DC-voltage thus present in an intermediate circuit is inverted to an... | 04/28/2009 |
| 7508685 | Stabilized power supply A stabilized power supply for X-ray tubes having a first rectifier circuit, an inverter circuit comprising main switches, a transformer, a second rectifier circuit an oscillation circuit and an inverter circuit. The power supply includes an auxiliary circuit that ca... | 03/24/2009 |
| 7499296 | Electric power converter device with control means and process and converting power An electric power converter with a control device that comprises a processing unit receives control signals and sends modulated signals to inverter stages of the electric power converter. The control device also controls a common stage of the electronic power conver... | 03/03/2009 |
| 7499297 | Low-harmonics, polyphase converter circuit A polyphase converter circuit having p≧3 phases (R, Y, B) and a converter circuit element provided for each phase (R, Y, B) is specified, each converter circuit element having a rectifier unit, a DC voltage circuit which is connected to the rectifier unit and an i... | 03/03/2009 |
