For Inverters Patents (Class 363/55)
  • Patent number: 10381837
    Abstract: Photovoltaic systems and related techniques are provided. A method for commissioning a photovoltaic (PV) system may include obtaining data describing an arrangement of two or more components of the PV system; performing a test of the PV system, wherein performing the test includes determining whether the PV system complies with at least one PV system criterion based, at least in part, on at least a portion of the data describing the arrangement of the two or more components of the PV system; and in response to determining that the PV system complies with the at least one PV system criterion, activating the PV system and/or notifying a user of the PV system that the PV system complies with the at least one PV system criterion. The method may further include sending information associated with the PV system to a regulatory entity and/or an operator of an electrical grid.
    Type: Grant
    Filed: July 14, 2015
    Date of Patent: August 13, 2019
    Assignee: Fraunhofer USA, Inc.
    Inventors: Christian Hoepfner, Dirk E. Mahling, Matthew Alan Kromer, James R. Perkinson
  • Patent number: 10355639
    Abstract: The present disclosure relates to a photovoltaic system comprising at least one string of series-connected solar modules and an inverter, a test circuit which can be connected between the string and the inverter in at least one string line, and a testing method in particular for checking whether the inverter-side section of the string lines is closed and whether the inverter is connected.
    Type: Grant
    Filed: August 31, 2016
    Date of Patent: July 16, 2019
    Assignee: Phoenix Contact GmbH & Co. KG
    Inventor: Wolfgang Höft
  • Patent number: 10148192
    Abstract: A power supply system is disclosed. The power supply module comprises a three-phase voltage source, for generating a power source with three phases; a plurality of power supply modules, coupled to the three-phase voltage source, each comprising a plurality of major transforming modules corresponding to the three-phase voltage source for generating a plurality of direct-current voltages according to the three-phase voltage source; and at least a backup supply module, coupled to the plurality of power supply modules, each comprising a plurality of backup transforming modules corresponding to the three-phase voltage source, for generating the plurality of direct-current voltages corresponding to the three-phase voltage source by a backup transforming module corresponding to at least one of the plurality of major transforming modules of the plurality of power supply modules when the at least one of the plurality of major transforming modules is in an abnormal operation.
    Type: Grant
    Filed: April 25, 2018
    Date of Patent: December 4, 2018
    Assignee: Wiwynn Corporation
    Inventor: Kuan-Wei Hsu
  • Patent number: 9948093
    Abstract: The invention relates to a device and method for discharging an energy accumulator (C), in particular an intermediate circuit capacitor, in a high-voltage grid (3), in particular in a direct current intermediate circuit in a motor vehicle, having a direct current converter (5) connected downstream of the high-voltage grid (3), a low-voltage grid (4) connected downstream of the direct current converter (5), an power grid (7) connected downstream of the direct current converter (5) and parallel to the low-voltage grid (4) for supplying energy to a control circuit (9) of the direct current converter (5), and a first controllable switching element (S) which is connected to the connecting line between the direct current converter (5) and the low-voltage grid (4) and by means of which, in the event of a disturbance of the low-voltage grid (4), the direct current converter (5) and the power grid (7) can be disconnected from the low-voltage grid (4).
    Type: Grant
    Filed: December 29, 2011
    Date of Patent: April 17, 2018
    Assignee: Robert Bosch GmbH
    Inventors: Thomas Peuser, Jochen Fassnacht
  • Patent number: 9866105
    Abstract: According to an embodiment, a method of controlling an inverter including a rectification unit rectifying inputted AC power to DC power, a smoothing unit smoothing the DC power, and a power conversion unit received the DC power from the smoothing unit to convert the received DC power into AC power having a predetermined size and frequency, the method includes receiving an abnormal signal of the inverter or an electric motor for driving the inverter, determining whether a DC terminal voltage of the smoothing unit is equal to or greater than a low voltage failure level when the abnormal signal is received, determining whether the power conversion unit is operating, and blocking current output of the power conversion unit when the DC terminal voltage is equal to or greater than the low voltage failure level and the power conversion unit is operating.
    Type: Grant
    Filed: July 31, 2015
    Date of Patent: January 9, 2018
    Assignee: LSIS CO., LTD.
    Inventors: Hu Jin Lee, Chun Suk Yang
  • Patent number: 9755459
    Abstract: An outlet control system includes a transmitter-detector module having a plug and at least one outlet electrically connected to the plug, wherein the transmitter-detector module is configured to transmit a control signal in response to power being applied to the transmitter plug; and a receiver-switch module comprising a receiver plug and a receiver outlet electrically connected to the plug through a power switch, wherein the receiver-switch module is configured to receive the control signal from the transmitter-detector module and provide a signal to the power switch, such that said power switch is turned on to cause the receiver plug to be connected to the receiver outlet when power is being applied to the transmitter plug and is not turned on when the power is not being supplied to the transmitter plug.
    Type: Grant
    Filed: March 3, 2016
    Date of Patent: September 5, 2017
    Assignee: Law Enterprises, LLC
    Inventor: Erin Wiggins
  • Patent number: 9641067
    Abstract: In various embodiments, a single-pole switching unit for limiting the energy flow in a series circuit having photovoltaic modules by a pulsating control signal present on at least one DC line is provided. The switching unit may include: a switching element, which is designed to reduce the current flow in the at least one DC line of the photovoltaic modules; a transmission element, which is designed to couple out an electrical control signal present on the DC line and to control the switching element merely with the energy of the coupled-out control signal; and a coupling element, which is arranged in parallel with the switching element and which conducts the control signal through the switching unit when the switching element is nonconducting.
    Type: Grant
    Filed: May 2, 2013
    Date of Patent: May 2, 2017
    Assignee: Solarworld Innovations GmbH
    Inventors: Olaf Storbeck, Michael Wolf, Matthias Georgi
  • Patent number: 9509143
    Abstract: A wide dynamic range charger module is configured to couple a variable power source such as a photovoltaic cell to a load. The module determines a maximum power point (MPPT) of the power source and based at least in part upon that MPPT selects one of a plurality of power converters to provide power to the load. The selection is such that the selected power converter is operating within its operating regime. The selected power converter may further be configured to a pre-determined input admittance which corresponds to the power source.
    Type: Grant
    Filed: March 16, 2015
    Date of Patent: November 29, 2016
    Assignee: Amazon Technologies, Inc.
    Inventor: David C. Buuck
  • Patent number: 9496716
    Abstract: An islanding detection apparatus minimizes a reduction in power quality and detects islanding when distributed generations are operated in parallel. Also, another islanding detection apparatus for parallel distributed generations synchronizes parallel distributed generations by periodically applying a reactive current at a half cycle. Further, another islanding detection apparatus for parallel distributed generations easily synchronizes parallel distributed generations even when inverters installed in the respective distributed generations are fabricated through different makers.
    Type: Grant
    Filed: April 16, 2015
    Date of Patent: November 15, 2016
    Assignee: KACO NEW ENERGY INC.
    Inventors: Kwang Seob Kim, Trung Kien Vu, San Kang, Min Jae Kim, Jae Yeon Choi
  • Patent number: 9298241
    Abstract: A redundant path power subsystem comprises a plurality of phase regulators in a multi-phase power converter. The plurality of phase regulators comprises at least N+2 phase regulators. N phases are sufficient to serve an electrical load coupled with the redundant path power subsystem. The redundant path power subsystem also comprises a plurality of power supplies, and a plurality of input and control paths between the plurality of power supplies and the plurality of phase regulators. The plurality of input and control paths comprises a plurality of multiplexing logic devices and a plurality of phase controllers. The plurality of phase controllers is operable to control the plurality of phase regulators. The plurality of multiplexing logic devices is operable to multiplex control signals from the plurality of power supplies and a microprocessor for the plurality of phase controllers.
    Type: Grant
    Filed: August 23, 2012
    Date of Patent: March 29, 2016
    Assignee: International Business Machines Corporation
    Inventors: Daniel J. Barus, Kevin R. Covi, William P. Kostenko, Jack P. Lee, Peter A. Wendling
  • Patent number: 9263356
    Abstract: A partition in lattice form forms a plurality of housing sections. A plurality of circuit blocks including a semiconductor block and a terminal base block are electrically connected one to another in a state of being housed in the housing sections to form a power semiconductor circuit. The semiconductor block is formed by covering an IGBT with an insulating material. A collector of the IGBT is connected to an electrode through a metal plate. The electrode is led out from an inner portion of the insulating material to a side surface of the insulating material. A terminal base block includes a power terminal to which an external power wiring for supplying electric power to the IGBT is electrically connected, and a screw hole into which a screw for fixing the power wiring is inserted.
    Type: Grant
    Filed: May 28, 2012
    Date of Patent: February 16, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventor: Noboru Miyamoto
  • Patent number: 9036383
    Abstract: In some aspects of the invention, overcurrent protection is carried out by suppressing fluctuations in current flowing through a switching element after overcurrent detection. A peak current reaching time detection circuit detects a peak current reaching time needed until current flowing through a switching element reaches a peak value. A difference voltage detection circuit, including a ½ time detection circuit which detects a time of ½ an ON time of the preceding cycle of the switching element, detects difference voltage between reference voltage used when detecting overcurrent flowing to a load and a signal which has detected current flowing through the switching element for the ½ time. A delay time adjustment circuit, based on at least one of the peak current reaching time and difference voltage, carries out adjustment and control of a delay time occurring until the time when the switching element is turned off after detecting the overcurrent.
    Type: Grant
    Filed: September 11, 2013
    Date of Patent: May 19, 2015
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Jun Yabuzaki
  • Patent number: 9025350
    Abstract: The present application relates to a cascaded H-Bridge medium voltage drive, a power cell, and a bypass module thereof, wherein the bypass module is configured for bypassing a major circuit module of the power cell, while the major circuit module comprises a fuse, a rectifier, a bus capacitor and an H-Bridge inverter, two points led from the H-Bridge inverter being configured as a first output end and a second output end; a bypass circuit comprises a first bridge arm and a second bridge arm; a point led from the first bridge arm is configured as a first input end of the bypass circuit, a point led from the second bridge arm is configured as a second input end of the bypass circuit, and the first input end is electrically connected with the first output end, the second input end is electrically connected with the second output end.
    Type: Grant
    Filed: September 27, 2012
    Date of Patent: May 5, 2015
    Assignee: Delta Electronics (Shanghai) Co., Ltd.
    Inventors: Hongjian Gan, Qinglong Zhong
  • Publication number: 20150103572
    Abstract: An inverting apparatus and a control method thereof are disclosed herein. The inverting apparatus includes an inverter. The inverter is configured to convert electrical energy to an output current so as to generate an output terminal voltage. When the output current increases, the output terminal voltage increases correspondingly. The inverter includes a control unit. When the output terminal voltage increases and falls within an alert range, the control unit is configured to control the inverter to decrease the output current or maintain the current output current so as to prevent the output terminal voltage from increasing and exceeding a voltage threshold value that causes the inverter to fall into a trip protection mechanism.
    Type: Application
    Filed: May 22, 2014
    Publication date: April 16, 2015
    Applicant: AU OPTRONICS CORP.
    Inventor: Yuan-Bor JEAN
  • Patent number: 8988034
    Abstract: A drive system for an electric motor includes a connection for a battery, and an inverter having an input side connected to an intermediate circuit and an output side having a connection for an electric motor. The intermediate circuit includes a first thyristor connected in parallel with an intermediate circuit capacitance. The drive system may also include a rectifier having an input side connected at the output side of the inverter in parallel with the electric motor, and a second thyristor connected an output side of the rectifier. The first/second thyristor are configured to be activated by a monitor incorporated in or assigned to the drive system. In the event of a malfunction, the input and/or output side of the inverter can be electrically isolated to allow a multiply redundant armature short circuit.
    Type: Grant
    Filed: July 17, 2012
    Date of Patent: March 24, 2015
    Assignee: Siemens Aktiengesellschaft
    Inventors: Hans-Georg Köpken, Günter Schwesig
  • Patent number: 8964429
    Abstract: An inverter device includes: an inverter circuit configured to perform ON/OFF operations with a preset duty cycle to convert a DC power into an AC power and output the AC power to an AC motor; and a controller configured to change a duty cycle of the ON/OFF operations.
    Type: Grant
    Filed: March 14, 2012
    Date of Patent: February 24, 2015
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Yuki Horie, Shinji Watanabe, Yasushi Nakano, Yukihiro Shima
  • Publication number: 20150036397
    Abstract: An inverter and an over current protection method thereof are provided. The inverter includes an inverting circuit, a filtering capacitor and an over current protection circuit. The inverting circuit is configured to convert a DC input voltage into an AC output voltage and provide the AC output voltage to a load. The filtering capacitor is coupled to the inverting circuit and the load in parallel. The over current protection circuit is coupled to the inverting circuit and the filtering capacitor and configured to provide an over current protection mechanism. The over current protection circuit detects an AC current on the filtering capacitor and determines whether to enable the over current protection mechanism according to the AC current in order to restrain the power conversion operation of the inverting circuit.
    Type: Application
    Filed: July 4, 2014
    Publication date: February 5, 2015
    Inventors: Chuan-Yun Wang, Ming Xu, Jian-Guo Mu
  • Publication number: 20150036396
    Abstract: An assembly includes a converter and a controller. The converter has a winding around a transformer core, first and second switches configured to alternately connect respective winding segments to an input power, and first and second resistors respectively connected in series with the switches. The controller is configured to compare voltages corresponding to currents through the resistors and terminate operation of the converter when a difference between the voltages exceeds a threshold indicative of transformer core flux walking.
    Type: Application
    Filed: August 5, 2013
    Publication date: February 5, 2015
    Applicant: Lear Corporation
    Inventors: Krzysztof Klesyk, George Kaminski
  • Patent number: 8946946
    Abstract: A converter device (for power conversion in e.g. a power plant such as a wind turbine is disclosed. An individual controller is provided for each phase of an electrical output power of the converter. If a voltage of one phase is indicated as being out of a predetermined voltage band, an active current of this phase is set to zero and optionally a reactive component of this phase is set to a value that depends on the indicated voltage.
    Type: Grant
    Filed: January 13, 2011
    Date of Patent: February 3, 2015
    Assignee: Siemens Aktiengesellschaft
    Inventors: Björn Andresen, Steffen Wulff
  • Patent number: 8937822
    Abstract: A 1, 2 or 3-phase DC to AC converter system for reducing the cost of solar energy installations achieves cost reduction by eliminating low-frequency power transformers. One DC input polarity is selectively switched to an output terminal when the instantaneous AC output from a second output terminal is desired to be of the opposite polarity, while the other DC input polarity is used to form an approximation to a segment of a sine wave of the desired polarity at the second output terminal. A common-mode AC signal is thereby created on the balanced DC input lines at a frequency which is a multiple of 1, 2 or 3 times the AC output frequency and which is useful for detecting ground faults in the DC circuit.
    Type: Grant
    Filed: May 8, 2011
    Date of Patent: January 20, 2015
    Inventor: Paul Wilkinson Dent
  • Patent number: 8928363
    Abstract: The dead time is secured stably in a semiconductor drive circuit for switching devices using a wide band gap semiconductor. The drain terminal of the switching device of an upper arm is connected to the positive terminal of a first power supply, the source terminal of the switching device of a lower arm is connected to the negative terminal of the first power supply, and the source terminal of the switching device of the upper arm is connected with the drain terminal of the switching device of the lower arm. A gate drive circuit provided for each switching device includes an FET circuit and a parallel circuit made of a parallel connection of a first resistor and a first capacitor and having a first terminal connected to the gate terminal of the switching device.
    Type: Grant
    Filed: September 30, 2011
    Date of Patent: January 6, 2015
    Assignee: Hitachi, Ltd.
    Inventors: Ayumu Hatanaka, Kaoru Kato, Katsumi Ishikawa, Naoki Maru
  • Patent number: 8908398
    Abstract: A method for operating a converter circuit is provided. The converter circuit includes a converter unit and a transformer. The transformer includes at least one winding set with a primary winding and a secondary winding. The converter unit is connected, on the AC voltage side, to the primary winding of the respective winding set. In order to compensate for undesirable saturation of the transformer, the converter unit is used to deliberately apply a DC voltage to the primary winding of the respective winding set of the transformer.
    Type: Grant
    Filed: December 2, 2011
    Date of Patent: December 9, 2014
    Assignee: ABB Technology AG
    Inventors: Beat Buchmann, Beat Ronner
  • Patent number: 8896260
    Abstract: A power supply unit for a press machine having a converter (converter circuit) connected to a commercial AC power supply, and an inverter (inverter circuit) connected to a press motor, includes an electrical energy bank, an inrush prevention circuit, an inrush prevention instruction signal generation section, and a contactor switch section, wherein contactors of the inrush prevention circuit are switched from on ON state to an OFF state and inrush prevention resistors of the inrush prevention circuit are connected to AC phase current paths on condition that the inrush prevention instruction signal generation section has generated and output an inrush prevention instruction signal (Sres) during press operation.
    Type: Grant
    Filed: December 4, 2012
    Date of Patent: November 25, 2014
    Assignee: Aida Engineering, Ltd.
    Inventor: Kazuhiro Kuboe
  • Patent number: 8890465
    Abstract: The invention relates to power converter circuits which are suitable, in particular, for mobile drive systems with stringent requirements in terms of weight minimization and availability as well as direct attachment to rotating field machines. Inter alia, the strictly modular design of the electronics and the very low expenditure on passive filter elements by virtue of the principle involved are characteristic.
    Type: Grant
    Filed: January 31, 2011
    Date of Patent: November 18, 2014
    Assignee: ECPE Engineering Center for Power Electronics GmbH
    Inventors: Rainer Marquardt, Nikolaus Michels
  • Patent number: 8884577
    Abstract: In a control apparatus for a rotary electric machine receiving power from a DC power supply, a DC-AC converting circuit is provided with serially connected circuits each having high-potential-side and low-potential-side switching elements. When a short-circuit occurs at the switching elements, all the switching elements are turned OFF for failsafe and a path connecting the machine and the battery is opened. In such a case, a switching element belonging to part of the switching elements is turned ON, with potential at all the terminals of the rotary electric machine being the same. A location of the short-circuit occurs is identified, based on changes in current passing through the machine and being detected in response to turning ON the switching element. The changes are at least one of a reduction change in deviation of the current from a zero point and a reduction change in an absolute value of the current.
    Type: Grant
    Filed: September 16, 2011
    Date of Patent: November 11, 2014
    Assignee: Denso Corporation
    Inventor: Hiroya Tsuji
  • Patent number: 8879292
    Abstract: An electrical circuit for a power converter is described. The circuit has been provided with several semiconductor switches and capacitors used for operating the power converter. A brake resistance for lowering energy is provided and is connected to the semiconductor switches provided without the need for an additional switch. The operation of the power converter and the current flowing through the brake resistance can be controlled by means of the existing semiconductor switches.
    Type: Grant
    Filed: November 20, 2012
    Date of Patent: November 4, 2014
    Assignee: GE Energy Power Conversion GmbH
    Inventors: Roland Jakob, Thomas Brückner
  • Patent number: 8861232
    Abstract: The current-sensing circuit (1) includes a shunt resistor (R1) connected in series with a path of current from an inverter (106), an operational amplifier (12) amplifying voltage across both ends of this shunt resistor (R1) with a predetermined gain, a low-pass filter (18) averaging output voltage of this operational amplifier (12), and an arithmetic unit (50) calculating the current flowing through the path based on output voltage of the low-pass filter (18). The supply voltage of the operational amplifier (12) is set higher than the supply voltage of the arithmetic unit (50). The output voltage of the operational amplifier (12) is averaged at the low-pass filter (18) to a lower value than the supply voltage of the arithmetic unit (50).
    Type: Grant
    Filed: March 18, 2010
    Date of Patent: October 14, 2014
    Assignee: Daikin Industries, Ltd.
    Inventors: Motonobu Ikeda, Satoshi Yagi, Ryousuke Yamamoto
  • Patent number: 8853989
    Abstract: A motor can be driven while reducing the power loss of the entire system where a plurality of devices that causes power losses exists. The system is provided with an inverter connected to a motor, a first converter that is connected between a fuel cell and the inverter and sets an output voltage of the fuel cell, a second converter that is connected between a power storage device and the inverter and sets an input voltage Vin of the inverter, and a controller that controls the first converter and the second converter. Under the operating condition (torque, number of revolutions) required for the motor, an input voltage of the inverter which minimizes a power loss of at least one of the motor, the first converter, the second converter and the inverter is determined, and the determined input voltage is output as a necessary voltage for the inverter.
    Type: Grant
    Filed: July 9, 2009
    Date of Patent: October 7, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Kenji Umayahara
  • Publication number: 20140268944
    Abstract: A surge blocking inductor. In one embodiment, the surge blocking inductor includes a core; a first winding wound about the core in a first direction; and a second winding wound about the core in a second direction, wherein the first winding and the second winding are magnetically independent when the core is in a non-saturated state, and wherein the first winding and the second winding are coupled magnetically when the core is in a saturated state.
    Type: Application
    Filed: May 29, 2014
    Publication date: September 18, 2014
    Applicant: Enphase Energy, Inc.
    Inventors: Martin Fornage, Arash Nejadpak
  • Publication number: 20140268943
    Abstract: A power system includes a DC power source having a maximum output voltage, a DC/AC inverter having an input coupled via a connection to the DC power source and an output for supplying AC power to a load, and a control circuit for controlling the DC/AC inverter. The control circuit is configured to maintain a DC voltage at the input of the DC/AC inverter above a threshold voltage to inhibit arcing as a result of a break in the connection between the DC power source and the DC/AC inverter. The threshold voltage is substantially equal to the maximum output voltage of the DC power source less a minimum arcing voltage for the connection between the DC power source and the DC/AC inverter.
    Type: Application
    Filed: March 13, 2013
    Publication date: September 18, 2014
    Applicant: ASTEC INTERNATIONAL LIMITED
    Inventor: Vijay Gangadhar Phadke
  • Patent number: 8829826
    Abstract: A regenerative load electric power management system can include a system bus, an input filter coupled to the system bus, a first bidirectional solid state power controller coupled to the system bus, a motor drive inverter coupled to the input filter, a second bidirectional solid state power controller coupled to the motor drive inverter, a bidirectional direct current DC-DC converter coupled to the second bidirectional solid state power controller and an energy storage bus coupled to the bidirectional DC-DC converter, the energy storage bus providing access to an energy storage device.
    Type: Grant
    Filed: August 25, 2011
    Date of Patent: September 9, 2014
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Gregory I. Rozman, Steven J. Moss
  • Patent number: 8804384
    Abstract: A converter includes at least device(s) for sensing the currents fed to the electric motor powered by the converter, the device(s) for current detection being arranged inside the converter, and the signals of the device(s) being fed to a nonlinear filter, whose output signals are fed to an additional filter that is connected to an analog-to-digital converter.
    Type: Grant
    Filed: November 23, 2004
    Date of Patent: August 12, 2014
    Assignee: Sew-Eurodrive GmbH & Co. KG
    Inventors: Thomas Schuster, Harald Wolf
  • Publication number: 20140211525
    Abstract: The invention relates to a method and an arrangement for the surge protection of inverters for photovoltaic systems, comprising at least one surge protection device which is physically integrated in the inverter or can be found in the vicinity of the inverter. The at least one surge protection device is connected to the DC side of the inverter. According to the invention, the inverter supplies a signal for setting or tracking the operating point at an operating level in the maximum power point (MPP) range, the response voltage of the surge protection device being predetermined, set, or selected on the basis of said signal.
    Type: Application
    Filed: August 21, 2012
    Publication date: July 31, 2014
    Applicant: DEHN + SÖHNE GMBH + CO. KG
    Inventor: Jens Ehrler
  • Patent number: 8792259
    Abstract: Software embodied in a machine-readable storage medium and useful for controlling alternating-current (AC) output of a power converter connected to an AC power network. The software is designed and configured to estimate the phase of the voltage on the AC power network that will be on the network when the network recovers from a fault. Such software allows a power-network-connected power source to ride-through a fault event and continue supplying power thereto at the designed phase and frequency. In one embodiment, the software provides this estimate by tracking the phase with a response time changed in inverse proportion to the voltage on the power network.
    Type: Grant
    Filed: May 29, 2013
    Date of Patent: July 29, 2014
    Assignee: Northern Power Systems, Inc.
    Inventor: Jeffrey K. Petter
  • Publication number: 20140204636
    Abstract: The present disclosure discloses a current limiting control method for a diode neutral-point-clamped three-level inverter and a related circuit. When a current in switching tubes is lowered to a value not greater than a first preset current value, the current limiting control method for a diode neutral-point-clamped three-level inverter and the related circuit drive an inside switching tube of the switching tubes to be turned on; after a first delay time, drive another inside switching tube to be turned on; after a second delay time, control an inside switching tube to be turned off and the other inside switching tube to be normally turned on; and control all the switching tubes to be turned on or off according to a control time sequence of the diode neutral-point-clamped three-level inverter circuit.
    Type: Application
    Filed: March 25, 2014
    Publication date: July 24, 2014
    Applicant: Huawei Technologies Co., Ltd.
    Inventors: Kelei LIU, Fuzhou WANG, Yihang LV
  • Publication number: 20140198544
    Abstract: In order to obtain a contactless power supply device which, even when a spatial gap between a primary winding and a secondary winding varies, is capable of not only accurately detecting whether or not the primary winding and the secondary winding come into the position opposite to each other, but also detecting how large the spatial gap between the primary winding and the secondary winding is created, the contactless power supply device is provided with a drive voltage detection unit which detects the drive voltage of an inverter circuit, a drive current detection unit which detects the drive current of the inverter circuit, and a primary component extraction unit which, from the drive voltage and the drive current, extracts a primary drive voltage and a primary drive current including the first order frequency-components having the same frequency as a drive frequency of the inverter circuit.
    Type: Application
    Filed: September 5, 2012
    Publication date: July 17, 2014
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kazufumi Tanaka, Sadayuki Matsumoto
  • Patent number: 8736102
    Abstract: The multifunctional power converter apparatus and method includes an input power stage configured to receive a DC input voltage from a DC power source and convert the DC input voltage to an AC or DC output voltage. At least one electrical power conversion electronic circuit is connected to an output of the input power stage, a DC output circuit; an AC output circuit; and a controller configured to control the input power stage, the DC output circuit and the AC output circuit. The controller is configured to automatically control the power converter output voltage based on a preselected user input.
    Type: Grant
    Filed: October 7, 2010
    Date of Patent: May 27, 2014
    Assignee: The Boeing Company
    Inventors: Lijun Gao, Shengyi Liu, Kamiar J. Karimi
  • Patent number: 8736206
    Abstract: A power converting apparatus including a power converter that converts a DC voltage into an AC voltage and applies the AC voltage to an AC rotating machine and a control unit that controls the power converter based on an operation command from the outside is provided. The power converting apparatus includes: a first calculating unit that calculates and outputs, from a d-axis current detection value and a q-axis current detection value detected by the AC rotating machine and current command values based on the operation command, first voltage command values to the power converter, magnetic fluxes of the AC rotating machine, and an angular frequency; and a second calculating unit that sets, as an initial value, at least one of the magnetic fluxes and the angular frequency input from the first calculating unit and calculates and outputs second voltage command value to the power converter and an angular frequency.
    Type: Grant
    Filed: April 27, 2009
    Date of Patent: May 27, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masaki Kono, Keita Hatanaka
  • Publication number: 20140139260
    Abstract: A method of detecting an islanding condition for a grid tied inverter includes receiving a plurality of sensed operating conditions for the grid tied inverter, and determining, based on the sensed operating conditions, whether a first fault has occurred. After determining that a first fault has occurred, the method includes determining whether a second fault has occurred. An islanding fault signal is generated when the second fault is determined to have occurred.
    Type: Application
    Filed: November 21, 2013
    Publication date: May 22, 2014
    Inventors: Jayaraman Vijay Shankar, Suryanarayana Potharaju
  • Patent number: 8730690
    Abstract: An electric machine drive system is described. The system includes an inverter, an electric machine coupled to the inverter by at least one output conductor and including a ground connection, and an active common mode current reducing device coupled between the ground connection of the electric machine and the inverter.
    Type: Grant
    Filed: November 30, 2010
    Date of Patent: May 20, 2014
    Assignee: General Electric Company
    Inventors: Rixin Lai, Joseph Smolenski
  • Patent number: 8717719
    Abstract: The invention relates an inverter that may be set up as part of a power generation system for the connection of a number of substrings, which, using DC switches, can be connected to each other in series into a string and with the inverter. The inverter includes a bridge circuit to transform the power generated by the string comprising series-connected substrings into a grid-compatible AC voltage and to feed the power into a grid. The inverter also includes a ground fault detector arranged on the AC side of the bridge circuit for ground fault monitoring of the string. A controller connected to the ground fault detector controls the DC switches so that in case of a ground fault, a complete decoupling of the connection of the string from the bridge circuit and a separation of the string into potential-free substrings is performed. A method of operating such a power generation system is also described.
    Type: Grant
    Filed: May 11, 2011
    Date of Patent: May 6, 2014
    Assignee: SMA Solar Technology AG
    Inventors: Matthias Victor, Frank Greizer
  • Publication number: 20140119072
    Abstract: A method for detecting an arc fault in a photovoltaic power circuit includes operating a photovoltaic generator at a first working point. A first signal related to a DC-current and/or a DC-voltage in the power circuit is determined. The first signal is analyzed and it is determined whether the signal indicates the presence of an electric arc in the power circuit. If so, the photovoltaic generator is operated at a second working point and a second signal related to the DC-current and/or the DC-voltage is determined. The first and second signals are then compared; and the occurrence of an arc fault in the power circuit is selectively signaled based on the comparison.
    Type: Application
    Filed: December 13, 2013
    Publication date: May 1, 2014
    Inventors: Holger Behrends, Sebastian Bieniek, Thorsten Buelo, Markus Hopf, Gerd Bettenwort, Marcel Kratochvil, Christopher Merz, Oliver Prior
  • Publication number: 20140092653
    Abstract: In an electronic circuit, a first circuit region is electrically connected to an input circuit region of an isolated switching power source, and a second circuit region is electrically connected to an output circuit region thereof. A driver of an IC is located in the second circuit region and drives a target device based on output power supplied to the second circuit region via the output circuit region from the isolated switching power source. A transferring module of the IC transfers a value of a parameter indicative of the output power from the second circuit region to the first circuit region while maintaining electrical isolation between the first and second circuit regions. An operating module of the IC performs on-off operations of a switching element to perform feedback control of the value of the parameter indicative of the output power to a target value.
    Type: Application
    Filed: October 1, 2013
    Publication date: April 3, 2014
    Applicant: DENSO CORPORATION
    Inventors: Tomotaka SUZUKI, Tsuneo MAEBARA
  • Patent number: 8687393
    Abstract: A power converter module is disclosed, which is an all-digital module. The power converter module includes a reference voltage generation unit, a voltage loop control unit, a current loop control unit, an input voltage compensation unit, and a pulse width modulation generation unit, to transfer input power to stable output power for providing power to an external loading device through driving bridge switch unit with external driver. The voltage loop control unit and the current loop control unit contain a proportion-integral-differentiation controller for receiving signal related to voltage and current of loading device to form voltage control loop and current control loop. The pulse width modulation generation unit contains function of deciding necessary stop time to improve quality of output power and decrease the effect of input power and loading variation, and to provide stable sine-waveform output power to the external loading device.
    Type: Grant
    Filed: March 15, 2012
    Date of Patent: April 1, 2014
    Assignee: Inno-Tech Co., Ltd.
    Inventors: Shu-Chia Lin, Wen-Yueh Hsieh, Ching-Yuan Lin
  • Publication number: 20140078793
    Abstract: Arc flash mitigation devices are employed to protect personnel during maintenance of photovoltaic inverters. During normal operation, an alternating current (AC) output of a photovoltaic inverter is coupled to a low voltage winding of a step up transformer through a bus-bar (e.g., an electrically conductive interconnect), which has higher current rating than a fuse. During maintenance, the bus-bar is replaced with the fuse. The fuse may be employed in conjunction with a switch. The switch may be a disconnect switch that places the bus-bar in parallel with the fuse during normal operation, and decouples the bus-bar from the fuse during maintenance. The switch may also be a transfer switch that places either the bus-bar or the fuse in series with the AC output of the photovoltaic inverter and the low voltage winding of the step up transformer.
    Type: Application
    Filed: September 18, 2012
    Publication date: March 20, 2014
    Inventors: Seshadri SIVAKUMAR, Jiyong LIAN, Venkat Reddy KONALA, David BARR, Priyantha SIRISOORIYA, Jacqueline AHMAD, Jason SPOKES
  • Publication number: 20140062356
    Abstract: A method for operating an inverter, wherein the inverter can be connected to a DC voltage source on the input side for the purpose of electrical energy supply, wherein the inverter has a plurality of controllable switches which are switched alternately in order to provide a polyphase electric current on a corresponding plurality of phase lines of the inverter, in particular in order to supply an electric machine with electric current in polyphase fashion, wherein at least one electrical variable of at least one of the phase lines and at least one switch-on time of at least one of the controllable switches are detected and an input current is determined on the basis of the detected variables.
    Type: Application
    Filed: August 28, 2013
    Publication date: March 6, 2014
    Inventors: Christian Djonga, Andrea Deflorio, Daniel Zimmermann
  • Publication number: 20140062368
    Abstract: The invention relates to a control device (12) for actuating a pulse-controlled converter of an electric drive system, having: an open-loop/closed-loop control circuit (12a) which is configured to generate pulse-width-modulated actuation signals for switching devices of the pulse-controlled converter; a fault logic circuit (12b) which can detect fault states in the drive system and which is configured to select a switching state or a sequence of switching states for the switching devices of the pulse-controlled converter which are assigned to the corresponding fault state; and a protection circuit (12c) which is embodied in hardware and which comprises a signal delay device (15), which is configured to delay the actuation signals in order to implement a minimum protection time, and a locking device (16a, 16b) which is configured to lock two complementary switching devices of a bridge branch of the pulse-controlled converter with respect to one another.
    Type: Application
    Filed: February 28, 2012
    Publication date: March 6, 2014
    Applicant: ROBERT BOSCH GMBH
    Inventors: Julia Roessler, Martin Trunk, Andreas Schoenknecht, Tim Bruckhaus
  • Patent number: 8655460
    Abstract: A drive control device having an inverter with semiconductor switches controlled by control signals is operated by calculating with a control logic a control signal time instant for each control signal, transmitting during operation the control signal time instants with the control logic during switching pauses of the semiconductor switches from a low-voltage side of the drive control device to a high-voltage side of the drive control device having the inverter, and generating the control signals for controlling the semiconductor switches on the high-voltage side based on the transmitted control signal time instants.
    Type: Grant
    Filed: May 15, 2012
    Date of Patent: February 18, 2014
    Assignee: Siemens Aktiengesellschaft
    Inventors: Dieter Eckardt, Hans-Peter Krätz
  • Patent number: 8624538
    Abstract: A motor driving apparatus is provided that performs AC/DC conversion by suppressing harmonics of the input at the time of normal operation, while on the other hand, allowing system operation to continue in the event of an overload by avoiding system stoppage.
    Type: Grant
    Filed: March 21, 2011
    Date of Patent: January 7, 2014
    Assignee: FANUC Corporation
    Inventors: Tomokazu Yoshida, Takashi Harada, Shinichi Horikoshi, Yasusuke Iwashita
  • Publication number: 20130343104
    Abstract: A method of managing recovery from an event in an electrical circuit leading to a loss of control of an inverter in the electrical circuit is disclosed, the method comprising sampling a parameter of operation before the event, monitoring for occurrence of the event, calculating an estimated value of the parameter at a time after the event based on an extrapolation of the monitored parameter and controlling the inverter using the estimated value of the parameter.
    Type: Application
    Filed: June 18, 2013
    Publication date: December 26, 2013
    Inventor: Michael Cade