For Reactive Power Control Patents (Class 323/205)
  • Patent number: 10264634
    Abstract: An adaptive power regulation converter for battery powered emergency lighting LED driver is disclosed. The power feedback and power compensation circuits regulate the output power to LED strings and provides tighten regulated constant power and constant lumens for emergency light during power out time. The adaptive power regulation converter can be used for a great range of LED strings.
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: April 16, 2019
    Inventor: Jie Dong Wang
  • Patent number: 10228673
    Abstract: A method for controlling and/or closed-loop controlling an electric energy system. Empirical data are provided in a first data storage device for stabilizing the energy system, and a multi-dimensional decision matrix created with a data processing system in a second data storage device. The decision matrix respectively containing as a first dimension derived from the empirical data, system states of the energy system and in the energy system as a second dimension, possible results. Phasor measurement data for current and voltage with a high temporal resolution and a time stamp are obtained with phasor measuring devices distributed in the energy system and used to control the electric energy system. A system state and a result determined by the data processing system using the phasor measurement data and at least one step is selected and automatically carried out for securing the stability of the energy system.
    Type: Grant
    Filed: June 24, 2015
    Date of Patent: March 12, 2019
    Assignee: Siemens Aktiengesellschaft
    Inventors: Chris Oliver Heyde, Rainer Krebs, Edwin Lerch
  • Patent number: 10224836
    Abstract: Various embodiments include determining an alternating current (AC) voltage and frequency of a supply voltage coupled to a circuit input. The circuit includes a soft starter circuit that is coupled between the circuit input and a first side of an AC motor. A stator winding configuration of the AC motor is determined. A control transformer is configured in response to the AC voltage and frequency, wherein the control transformer is coupled to the circuit input. A jumper device is configured on a second side of the AC motor in response to the stator winding configuration of the AC motor.
    Type: Grant
    Filed: September 18, 2015
    Date of Patent: March 5, 2019
    Assignee: Halliburton Energy Services, Inc.
    Inventor: Troy Dale Bachman
  • Patent number: 10224938
    Abstract: Apparatuses and methods for indirect phase variation detection are disclosed herein. An example apparatus may include a clock generator circuit comprising a delay-locked loop (DLL) circuit configured to adjust a phase of a clock signal based on a phase of a feedback clock signal during an initial phase-lock operation. The DLL circuit includes a phase deviation detection circuit configured to detect a variation in a phase of the clock signal based on variations in gate delays of an oscillation circuit, and to initiate a subsequent phase-lock operation in response to detecting variations in the gate delays of the oscillation circuit.
    Type: Grant
    Filed: July 26, 2017
    Date of Patent: March 5, 2019
    Assignee: Micron Technology, Inc.
    Inventor: Hiroki Takahashi
  • Patent number: 10116473
    Abstract: An apparatus may include a delta-sigma modulator for quantization noise shaping of a digital signal, a digital-to-analog converter configured to generate an analog signal from the digital signal, and an amplifier configured to amplify the analog signal and powered from a charge pump, wherein the charge pump is configured to operate at a switching frequency approximately equal to a zero of a modulator noise transfer function of the delta-sigma modulator, such that the impact of charge pump noise on a total harmonic distortion noise of the apparatus is minimized.
    Type: Grant
    Filed: March 20, 2018
    Date of Patent: October 30, 2018
    Assignee: Cirrus Logic, Inc.
    Inventors: Pradeep Dhananjay, Tejasvi Das, Bhupendra Manola, Bruce E. Duewer
  • Patent number: 10090752
    Abstract: A power conversion device has a main switch connected to a positive electrode side line of a battery, at least one semiconductor power element connected between the main switch and a negative electrode voltage line, and an auxiliary circuit having an auxiliary switch, a resonance reactor and an auxiliary diode connected parallel to the main switch. The device further has a voltage detection part which detects an external side voltage of the main switch and a control circuit part performing a switching control of the main switch and the auxiliary switch based on the detection result of the voltage detection part. During the turned-off state of the main switch, the control circuit part turns off the auxiliary switch before the external side voltage of the main switch reaches an input voltage of the main switch. This external side voltage starts to increase when the auxiliary switch is turned on.
    Type: Grant
    Filed: December 27, 2017
    Date of Patent: October 2, 2018
    Inventors: Masaya Takahashi, Eisuke Takahashi, Takuya Kiguchi
  • Patent number: 10037307
    Abstract: A device for calculating an average of nonlinear data includes: an input module for receiving a nonlinear function F and nonlinear data y1and y2; a comparison module for deriving nonlinear data c1 and c2 sorted in a descending order, by comparing the nonlinear data y1 and y2; an index module for deriving an index value d1 according to a preset computation, from the sorted nonlinear data c1 and c2; a lookup table (LUT) memory for pre-storing an LUT of the index value d1 and a variable B by using a preset computation formula, and deriving the variable B corresponding to the index value d1 if the index value d1 is received; and a computation module for receiving c1 of the sorted nonlinear data and the variable B and deriving a final nonlinear output value A through the preset computation.
    Type: Grant
    Filed: February 26, 2016
    Date of Patent: July 31, 2018
    Inventor: Seokjin Han
  • Patent number: 10033267
    Abstract: The present application relates to power converters, particularly switch mode power converters sharing a load in which the converters are operated to share stresses between them. The application provides a controller (108) in which a stress share control loop (108a, 108b) is provided to ensure the associated converter is operating at an average stress. The stress share control loop has a proportional and an integral term in its feedback path. The integral term may be enabled or disabled. In use, the integral term is enabled in all but one controller.
    Type: Grant
    Filed: July 7, 2014
    Date of Patent: July 24, 2018
    Inventors: Karl Rinne, Basil Almukhtar, Elaine Sheridan
  • Patent number: 9979194
    Abstract: A power compensation apparatus compensates for power of a power system to be allowed to transmit from at least one or more power sources to a load. The power compensation apparatus includes a first system connected to the power system to compensate for active power and reactive power of the power system, a second system connected to the first system to store power necessary for compensating for active power and reactive power, and a third system connected to the second system to generate the power to be stored in the second system.
    Type: Grant
    Filed: August 23, 2017
    Date of Patent: May 22, 2018
    Assignee: LSIS CO., LTD.
    Inventor: Eun Jae Lee
  • Patent number: 9897072
    Abstract: A method for the operation of a pitch system of a wind turbine with at least one rotor blade, wherein the pitch system has at least one input rectifier and at least one pitch drive, each rotor blade can be rotated around its longitudinal axis by the one pitch drive or by at least one of several pitch drives, each input rectifier is supplied with alternating voltage by a supply network, and each pitch drive is supplied with electric power by the one input rectifier or by at least one of several input rectifiers, each pitch drive is connected to an emergency power storage device, whereby each pitch drive can be supplied with electric power by the emergency power storage device that is connected to it.
    Type: Grant
    Filed: November 17, 2014
    Date of Patent: February 20, 2018
    Assignee: Moog Unna GmbH
    Inventors: Alf Vetter, Matthias Pauli
  • Patent number: 9893625
    Abstract: Disclosed herein is a DC/DC power supply apparatus, which includes a plurality of power boards, a control board and a main board. The plurality of power boards are coupled in parallel with one another, and each power board includes a carrier circuit board and a power device disposed on the carrier circuit board. The control board includes a feedback control circuit and a PWM generator circuit; the feedback control circuit is configured to receive one or more feedback signals from the power boards; the PWM generator circuit outputs a PWM control signal to the power boards based on the feedback signal. The main board is electrically coupled to the power boards and the control board.
    Type: Grant
    Filed: March 19, 2015
    Date of Patent: February 13, 2018
    Inventors: Wen-Hua Li, Sheng-Li Lu, Zhong-Wang Yang, Jin-Ying Zhang, Qiong Zhang
  • Patent number: 9847647
    Abstract: A solar power conversion system includes a photovoltaic array having photovoltaic modules for generating direct current (DC) power. A power converter is provided in the system for converting the DC power to alternating current (AC) power. A transformer is coupled between the power converter and a power grid for transmitting the AC power to the power grid. The transformer is connected to the power grid at the point of common coupling (PCC) and to the power converter at output terminals. A reactance estimation module is provided in the system for estimating a short circuit reactance at PCC based on a small change in a measured voltage at output terminals with respect to a small change in a measured reactive power at the output terminals. Further, a maximum reactive power estimation module estimates a maximum reactive power based on the estimated reactance, the measured voltage at output terminals, and the measured reactive power at the output terminals.
    Type: Grant
    Filed: October 7, 2015
    Date of Patent: December 19, 2017
    Assignee: General Electric Company
    Inventors: William James Premerlani, Patrick Hammel Hart, Maozhong Gong
  • Patent number: 9844107
    Abstract: Driver circuitry is coupled between a power supply and at least one LED in a solid-state lighting fixture, such that a non-isolated direct current (DC) path exists between the power supply and the at least one LED. The driver circuitry is configured to receive an AC input voltage and generate a driver output current for driving the at least one LED from the AC input voltage. By using driver circuitry that is non-isolated from the at least one LED in the solid-state lighting fixture, the efficiency of the driver circuitry may be increased, while simultaneously reducing the cost and complexity of the driver circuitry compared to conventional driver circuitry.
    Type: Grant
    Filed: August 25, 2014
    Date of Patent: December 12, 2017
    Assignee: Cree, Inc.
    Inventors: Yuequan Hu, Nicholas William Medendorp, Jr., Douglas E. Keiter
  • Patent number: 9843227
    Abstract: A power supply device according to an embodiment comprises a plurality of power sources 10 each including an antenna and an AC/DC conversion unit, a plurality of consolidating units 13_1 to 13_i, and a power supply unit 15. The consolidating units 13_1 to 13_i respectively include consolidating circuits 14_1 to 14_i that selectively consolidate a plurality of DC signals 21_1 to 21_n supplied by the plurality of power sources 10. The power supply unit 15 includes a consolidating circuit 16 that selectively consolidates the DC signals 21_1 to 21_i output from the plurality of consolidating units 13_1 to 13_i, and a voltage conversion circuit 17 that converts a DC signal 23 resulting from consolidation in the consolidating circuit 16, to a predetermined voltage.
    Type: Grant
    Filed: April 18, 2015
    Date of Patent: December 12, 2017
    Assignee: Renesas Electronics Corporation
    Inventors: Koichiro Noguchi, Koichi Nose, Yoshifumi Ikenaga, Yoichi Yoshida
  • Patent number: 9785167
    Abstract: A method is disclosed of controlling the operation of a system for providing electrical power to one or more electrical devices, the system comprising an adjustable power source root node and a plurality of adjustable power source remote nodes located remotely from the root node.
    Type: Grant
    Filed: August 7, 2015
    Date of Patent: October 10, 2017
    Assignee: UTILIDATA, INC.
    Inventor: David Gordon Bell
  • Patent number: 9772360
    Abstract: A detecting method for detecting an output impedance angle of an inverter includes controlling an inverter to output a second voltage signal and a current signal based on a first voltage signal; calculating an active power and reactive power based on the second voltage signal and the current signal; and calculating an output impedance angle of the inverter based on the product of the active power and a first amplitude parameter, the product of the active power and a second amplitude parameter, the product of the reactive power and the first amplitude parameter, and the product of the reactive power and the second amplitude parameter. The first amplitude parameter corresponds to a first amplitude of the first voltage signal, and the second amplitude parameter corresponds to the first amplitude of the first voltage signal and a second amplitude of an AC voltage.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: September 26, 2017
    Inventors: Jian-Hong Zhou, Cheng Lu, Jia-Min Zhang, Hong-Yang Wu
  • Patent number: 9643496
    Abstract: According to an embodiment, a power conversion apparatus for a vehicle is provided with a single-phase two-level converter and a single-phase three-level converter. The single-phase two-level converter is composed of a capacitor, first to fourth controllable switching devices, diodes connected in antiparallel with the controllable switching devices, respectively. The single-phase three-level converter is composed of two series-connected capacitors, fifth to tenth controllable switching devices, diodes connected in antiparallel with the controllable switching devices, respectively. The single-phase two-level converter and the single-phase three-phase converter are connected in series at the AC input/output points. The single-phase two-level converter has smaller switching loss than the single-phase three-level converter, and the single-phase three-level converter has higher withstand voltage property than the single-phase two-level converter.
    Type: Grant
    Filed: September 5, 2014
    Date of Patent: May 9, 2017
    Inventors: Yuusuke Kouno, Yosuke Nakazawa, Kentaro Suzuki, Ryuta Hasegawa, Tomoyuki Makino
  • Patent number: 9640339
    Abstract: An on-load tap changer has a switching tube, an oil suction pipe arranged centrally and coaxially along an axis inside the switching tube, and a kerosene drain screw so mounted in a base of the on-load tap changer that it is coaxial with an axis of the oil suction pipe, with the axis of the switching tube, and with an axis of the on-load tap changer. A bearing ring is so acted on by a resilient element at one side and radially with respect to the axis of the on-load tap changer that the switching tube and the oil suction pipe both mechanically positively cooperate with the bearing ring and are centered about the axis of the on-load tap changer.
    Type: Grant
    Filed: June 24, 2014
    Date of Patent: May 2, 2017
    Inventors: Klaus Hoepfl, Silke Wrede, Hubert Zwirglmaier
  • Patent number: 9621023
    Abstract: The present invention whose object is to reduce compensation current at the time when suppressing harmonic distortion caused by harmonic voltage, to reduce capacitance of an inverter, a resonance suppression device configured to suppress resonance which occurs when a power facility such as a wind power generator is connected to a power system includes: an inverter configured to supply alternating current to the power system, the inverter being in parallel with the power facility; a current command value generation unit in which voltage at a connection point between the power facility and the power system is inputted thereto and a current command value is obtained by multiplying, by a transfer function, a harmonic component contained in the voltage at the connection point; and a current control unit configured to control the alternating current outputted from the inverter based on the current command value.
    Type: Grant
    Filed: April 21, 2014
    Date of Patent: April 11, 2017
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventors: Kenya Murakami, Toru Jintsugawa, Tomohiro Koike, Kentaro Kofuji
  • Publication number: 20150145485
    Abstract: The various embodiments may include a power supply having a first loop in communication with a power stage of the power supply. A second loop in communication with the first loop may generate a negative reactance value that increases a power factor for the power supply to approximately one. A power supply may also include a rectifier coupleable to an input supply. A power factor compensation circuit coupled to the rectifier may generate a negative reactance. The negative reactance may reduce a phase angle between a current and a voltage provided to the input supply. A method may include sensing an output of a power supply, and adjusting the sensed value. The adjusted value may be compared to a reference value to generate an error value. The error value and a negative reactance value may be combined and the result may be provided to the power supply.
    Type: Application
    Filed: February 4, 2015
    Publication date: May 28, 2015
    Inventors: Manjing XIE, Zhixiang LIANG
  • Publication number: 20150137772
    Abstract: Systems and methods are disclosed for providing power factor correction (“PFC”) for multi-phase power delivery. A PFC sub-system can include multiple active PFC modules and multiple isolated DC-to-DC converters. Each active PFC module can increase a respective power factor associated with a respective phase of the multi-phase power system. Each DC-to-DC converter can be electrically connected to a respective active PFC module. Each isolated DC-to-DC converter can modify a respective DC voltage level for a respective DC voltage received from a respective active PFC module. Outputs of the isolated DC-to-DC converters are electrically connectable for providing a combined voltage or combined current to a load device. The combined voltage or combined current corresponds to the voltages received by the DC-to-DC converters from the active PFC modules.
    Type: Application
    Filed: November 19, 2013
    Publication date: May 21, 2015
    Inventors: Koffi Mawule, Paul C. Robinson
  • Patent number: 9031708
    Abstract: A VAR dispatch system. A central control system connected to a network is configured to receive data reflecting local variations in conditions on a power grid and to transmit system control commands over the network. A plurality of VAR dispatch devices are connected to the network and to the power grid. Each VAR dispatch device is configured to detect local variations in conditions on the power grid and to transmit the data reflecting such local variations to the central control system and to receive control commands from the central control system. Each VAR dispatch device is configured to store power and to output stored power to the power grid based on local variations in conditions on the power grid. Each VAR dispatch device is further configured to output stored power to the power grid when the VAR dispatch device receives system control commands from the central control system.
    Type: Grant
    Filed: July 17, 2008
    Date of Patent: May 12, 2015
    Assignee: GridPoint, Inc.
    Inventors: Ernest Penzenstadler, John Sauve, Guohui Yuan, Brian Golden
  • Patent number: 9030043
    Abstract: The present invention addresses the problem of avoiding that wind turbine voltage levels within a wind power plant do not exceed predetermined overvoltage and/or undervoltage protection levels. In particular, the present invention relates to shifting of an output voltage level of a wind power plant in order to protect an internal power plant grid against overvoltages.
    Type: Grant
    Filed: January 29, 2010
    Date of Patent: May 12, 2015
    Assignee: Vestas Wind Systems A/S
    Inventor: Jorge Martinez Garcia
  • Publication number: 20150123626
    Abstract: A power control apparatus includes: a first obtainment unit which obtains a power flow value at a power flow measuring point and a voltage value at a voltage measuring point provided; a power flow control unit which calculates a first power change value, to cause the power flow value to approach a predetermined target value; a voltage control unit calculates a voltage value at the voltage measuring point when the first power has been changed by the first power change value, and sets a second power change value, based on whether or not the voltage value falls within a predetermined voltage range; and a notification unit which notifies the power adjustment apparatus of a command value for causing the power adjustment apparatus to input or output the first power changed by the first power change value and the second power changed by the second power change value.
    Type: Application
    Filed: May 13, 2013
    Publication date: May 7, 2015
    Inventor: Kenichi Watanabe
  • Publication number: 20150108952
    Abstract: A transmission system and a method for transmitting electrical power which has been produced by at least one off-shore wind turbine to a utility grid being located on-shore is provided. The transmission system has (a) an off-shore transformer, which is connectable to the at least one wind turbine and which is configured for changing a first AC voltage level provided by the at least one wind turbine to a second AC voltage level, (b) a subsea AC transmission cable having an off-shore input end and an on-shore output end, wherein the input end is connected to the off-shore transformer, and (c) a compensation unit for compensating at least partially a reactive power being produced within the subsea AC transmission cable, wherein the compensation unit is electrically coupled to the subsea AC transmission cable at a node being located in between the off-shore input end and the on-shore output end.
    Type: Application
    Filed: October 2, 2014
    Publication date: April 23, 2015
    Inventors: Jesper Moeller, Jan Thisted
  • Publication number: 20150102785
    Abstract: A dynamic high-energy switch used for correcting load imbalance through connecting and disconnecting capacitance in a power feed circuit.
    Type: Application
    Filed: October 10, 2013
    Publication date: April 16, 2015
    Inventor: Robert Turner
  • Patent number: 9002761
    Abstract: A system, method and apparatus for automatically adapting power grid usage by controlling internal and/or external power-related assets of one or more users in response to power regulation and/or frequency regulation functions in a manner beneficial to both the power grid itself and the users of the power grid.
    Type: Grant
    Filed: November 18, 2011
    Date of Patent: April 7, 2015
    Inventor: Rey Montalvo
  • Patent number: 8994468
    Abstract: A modulation method is provided. The modulation method includes the steps of receiving multiple sinusoidal signals, obtaining the maximum value of the sinusoidal signals, obtaining the median value of the sinusoidal signals, and obtaining the minimum value of the sinusoidal signals within a period to generate a difference between the maximum value and the minimum value, generating a difference according to an upper limit and a lower limit of a predetermined comparison value, and comparing the two differences to generate an optimized modulation signal.
    Type: Grant
    Filed: May 15, 2013
    Date of Patent: March 31, 2015
    Assignee: Industrial Technology Research Institute
    Inventors: Shih-Hsiang Chien, Yong-Kai Lin, Chin-Hone Lin
  • Publication number: 20150077068
    Abstract: According to an embodiment, a voltage fluctuation suppressing apparatus is provided with a power storage device connected to an electric power system, a basic control unit to control an output of the power storage device, a voltage detector to measure a voltage of a connection point to the electric power system, and an output control unit to divide a control amount to be outputted to the basic control unit into a reactive power command value and an active power command value and to output them. The output control unit is provided with a reactive power upper limit value calculation unit, a reactive power calculation/output unit, and an active power calculation/output unit.
    Type: Application
    Filed: September 16, 2014
    Publication date: March 19, 2015
    Inventors: Shinya Naoi, Yasuhiro Noro, Yasuyuki Miyazaki, Takahiro Shimoo, Toshiaki Asano, Hideyuki Miyaji, Shinji Yurino, Yuji Watanabe
  • Publication number: 20150069979
    Abstract: An apparatus is capable of improving the power factor of a power supply powered by a high power line and a ground power line. The apparatus comprises a line voltage detector and an ON time controller. The line voltage detector provides a scaled voltage to represent a line voltage of the high power line. The ON time controller has a valley voltage detector, which provides, in response to the scaled voltage, a valley representative representing a valley voltage of the line voltage. The ON time controller controls an ON time of a power switch in the power supply in response to the valley representative.
    Type: Application
    Filed: September 5, 2014
    Publication date: March 12, 2015
    Inventors: Chang-Yi Lin, Yi-Chuan Tsai
  • Publication number: 20150069978
    Abstract: A voltage control apparatus includes: a voltage value obtainment unit configured to obtain voltage values at the one or more voltage measuring points; an impedance obtainment unit configured to obtain a system impedance from a distribution substation to each of power adjustment apparatuses; a control variable calculating unit configured to calculate a control variable including at least one of (i) a value corresponding to an allowable upper limit of a voltage value at the first voltage measuring point and (ii) a value corresponding to an allowable lower limit of the voltage value at the first voltage measuring point, based on the voltage values at the one or more voltage measuring points and the system impedances; and a notification unit configured to notify the power adjustment apparatuses of the calculated control variable.
    Type: Application
    Filed: April 3, 2013
    Publication date: March 12, 2015
    Applicant: Panasonic Corporation
    Inventors: Kenichi Watanabe, Junji Kondoh
  • Patent number: 8970184
    Abstract: An apparatus, a method, and a computer program product are provided. The apparatus determines an input voltage and an input current of a power system driving a low power factor load, the input voltage varying based on a power cycle, determines at least a first portion of the power cycle at which the input current exceeds a threshold, and couples at least one substantially resistive load to the low power factor load during at least a second portion of the power cycle different from the at least a first portion of the power cycle.
    Type: Grant
    Filed: November 5, 2012
    Date of Patent: March 3, 2015
    Assignee: QUALCOMM Incorporated
    Inventor: William H. Von Novak, III
  • Publication number: 20150054473
    Abstract: In a reactive power compensation device, a control unit controls a magnitude of reactive power to be output by a reactive power output unit, based on a detected system voltage and one or more control parameters in a first operation mode. In a second operation mode, the control unit changes the magnitude of the reactive power to be output by the reactive power output unit to a power system in an output change period, calculates system impedances of the power system at a plurality of detection time points within the output change period, based on change amounts of the system voltage detected at the plurality of detection time points and corresponding change amounts of the reactive power, and, when a variation in the calculated system impedances is within an acceptable range, adjusts the one or more control parameters, based on the calculated system impedances.
    Type: Application
    Filed: March 19, 2014
    Publication date: February 26, 2015
    Inventors: Akihiro MATSUDA, Shinichi MATSUDA, Masatoshi TAKEDA
  • Patent number: 8953041
    Abstract: An Engineer's View (EV) wireless video system for powered and unpowered model railroad engines is disclosed. The invention uses commercially available wireless spy cameras, powered by a custom power supply circuit which is compatible with either DC or DCC track systems. The present invention is compatible with all commercial model railroad gauge diesel engines including HO and N Gauge or may be factory installed. The EV system demonstrates a remarkably stable and realistic image of a model railroad layout. Moreover, the present invention may also provide a stable source of power to the engine where stalling could occur at points of track defects.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: February 10, 2015
    Inventors: Richard Johnson Bartlett, Sr., William Travis Bartlett
  • Publication number: 20150022163
    Abstract: In one embodiment, a power factor correction (PFC) circuit can include: (i) a rectifier bridge and a PFC converter coupled to an input capacitor; (ii) a harmonic wave compensation circuit configured to shift a phase of a DC input voltage provided from the rectifier bridge, where the harmonic wave compensation circuit comprises a phase of about ?45° when a corner frequency is about 50 Hz; and (iii) a PFC control circuit configured to control the PFC converter, where the PFC control circuit comprises a first sampling voltage, and the harmonic wave compensation circuit is configured to control a phase of the first sampling voltage to lag a phase of the DC input voltage by about 45°.
    Type: Application
    Filed: July 10, 2014
    Publication date: January 22, 2015
    Inventors: Yunlong Han, Huiqiang Chen
  • Patent number: 8934268
    Abstract: A power electronic converter for use in high voltage direct current power transmission and reactive power compensation which includes at least one converter limb including first and second DC terminals for connection in use to a DC network. The or each converter limb includes at least one first converter block and at least one second converter block connected between the first and second DC terminals. The or each first converter block includes a plurality of line-commutated thyristors and at least one first AC terminal for connection in use to an AC network. The or each second converter block includes at least one auxiliary converter including a plurality of self-commutated switching elements. The self-commutated switching elements are controllable in use to inject a voltage to modify a DC voltage presented to the DC side of the converter limb and/or modify an AC voltage and an AC current on the AC side of the power electronic converter.
    Type: Grant
    Filed: April 8, 2010
    Date of Patent: January 13, 2015
    Assignee: Alstom Technology Ltd
    Inventors: David Trainer, Andre Paulo Canelhas, Colin Charnock Davidson, Carl David Barker
  • Publication number: 20150002107
    Abstract: Reducing current harmonics at light loads is disclosed. In an example, a method includes increasing output voltage of a boost converter to reach a higher potential in a low power mode. After reaching the higher potential, the method includes dropping a set point for the output voltage.
    Type: Application
    Filed: January 31, 2012
    Publication date: January 1, 2015
    Inventors: Daniel Humphrey, Mohamed Amin Bemat
  • Publication number: 20140375283
    Abstract: The present invention relates to a control method for supporting active power factor correction (APFC) loads, comprising: providing square wave width of an output voltage waveform to be a comparatively large value to improve effective value of the output voltage, in order to meet the requirements for active power factor correction (APFC) loads; and gradually decreasing square wave width of the output voltage waveform from the comparatively large value to a comparatively small value to gradually decrease effective value of the output voltage to a desirable stable voltage effective value.
    Type: Application
    Filed: September 17, 2012
    Publication date: December 25, 2014
    Inventors: Kaijun Xie, Wuhua Hu
  • Publication number: 20140369097
    Abstract: A controller for use in a power converter includes a load sensing circuit coupled to output an error signal in response to a feedback signal representative of an output of the power converter. The error signal is representative of a load coupled to an output of the power converter. A burst mode control circuit is coupled to output a burst mode control signal in response to the error signal. An offset current generator circuit is coupled to output an offset current in response to the error signal. A drive circuit is coupled to control switching of a power switch to control a transfer of energy from an input of the power converter to the output of the power converter in response to the error signal, the burst mode control signal, the offset current, and a current sense signal representative of a current through the power switch.
    Type: Application
    Filed: June 14, 2013
    Publication date: December 18, 2014
    Inventors: Daniel C. Prescott, Roger Colbeck
  • Patent number: 8907615
    Abstract: An electrical power generation system, such as a solar power inverter, can provide dynamic real-time power compensation, so as to mitigate the effects of voltage sags and swells (e.g., on a utility grid) and thereby provide voltage support functionality to a local grid. The electrical power generation system can do so by receiving first synchrophasor measurements that are taken at a point on the utility grid and transmitted to the electrical power generation system and by taking second synchrophasor measurements. The first and second synchrophasors indicate voltage magnitude and frequency of the alternating current (AC) at their respective measurement points. The electrical power generation system can compare the first synchrophasors with the second synchrophasors and based upon the comparison, vary the power factor of the power the electrical power generation system generates (e.g., by either supplying or absorbing reactive power).
    Type: Grant
    Filed: June 15, 2011
    Date of Patent: December 9, 2014
    Assignee: Advanced Energy Industries, Inc.
    Inventors: Michael A. Mills-Price, Michael Ropp
  • Publication number: 20140354245
    Abstract: A method for controlling electric power supply, the method comprising: (a) controllably down converting by a step-down power converter entry voltage from a power source and preventing up-conversion by a step-up power converter, substantially when the entry voltage is larger than a measured exit voltage and is in compliance with a first criterion that is based on the entry voltage and on the measured exit voltage; wherein the measured exit voltage is measured at an exit of both step-up power converter and the step-down power converter; and (b) controllably up converting by the step-up power converter the entry voltage and preventing down-conversion by the step-down power converter, substantially when the entry voltage is lower than the measured exit voltage and is in compliance with a second criterion that is based on the entry voltage and on the measured exit voltage.
    Type: Application
    Filed: December 6, 2012
    Publication date: December 4, 2014
    Applicant: ELTA SYSTEMS LTD.
    Inventors: Enrique Batikoff, Robert Zelig
  • Publication number: 20140347020
    Abstract: Electrical power is fed from a wind energy installation into an AC voltage system via an energy transmission path, which is delimited by an installation-side transformer and a system-side transformer. A power factor correction device is connected, at a common node between the energy transmission path and the AC voltage system using a closed-loop control device, which controls the wind energy installation and which receives a variable which is proportional to the reactive power on the energy transmission path and a further measured variable. A measurement signal produced at the output of the power factor correction device is used as further measured variable. The closed-loop controller has such a control characteristic that the voltage on the low-voltage side of the system-side transformer increases, depending on the reactive power on the energy transmission path, from the inductive range to the capacitive range.
    Type: Application
    Filed: September 15, 2011
    Publication date: November 27, 2014
    Inventor: Bernhard Strobl
  • Patent number: 8897042
    Abstract: A power source system including power-factor modifying circuits to modify a power factor of supplied electric power, a time difference circuit to output start signals for instructing the power-factor modifying circuits to start an operation to the power-factor modifying circuits at specified time intervals, and a control circuit to supply the electric power to the power-factor modifying circuit to start the power-factor modifying circuit when the power-factor modifying circuit acquires the start signal output from the time difference circuit.
    Type: Grant
    Filed: January 24, 2011
    Date of Patent: November 25, 2014
    Assignee: Fujitsu Limited
    Inventors: Hiroshi Yamaki, Susumu Eguchi
  • Publication number: 20140328096
    Abstract: The present disclosure provides techniques for power factor correction on a constant current system. In an example embodiment, the present disclosure provides a power factor correction circuit which receives a constant current power input. The power factor correction circuit provides an input voltage tuned to match the phase of the input current. The input voltage is tuned via charging and draining an input capacitor by a switching device. The switching device is driven on a duty cycle synchronously associated with the input current waveform.
    Type: Application
    Filed: May 3, 2013
    Publication date: November 6, 2014
    Inventor: Traver Gumaer
  • Patent number: 8872484
    Abstract: Aspects relate to utilizing power factor correction to compensate for a leading power factor produced mainly due to electromagnetic interference (EMI) capacitors in front of a power factor correction stage. Provided is a power supply that includes a power factor correction circuit that includes a second harmonic generator component. The harmonic generator component includes a filter component and an integrator component. The filter component is configured to receive a rectified voltage and a power factor correction current and block a direct current component. The integrator component is configured to receive an alternating current component from the filter component and produce a harmonic that causes an angle of the power factor correction current to change from a leading power factor to a unity power factor or to a lagging power factor.
    Type: Grant
    Filed: August 17, 2011
    Date of Patent: October 28, 2014
    Assignee: Google Inc.
    Inventor: Sangsun Kim
  • Patent number: 8868313
    Abstract: A method for controlling the combustion in a gas turbine including measuring, with one or more probes situated adjacent to the combustion chamber of the turbine, the amplitude of the pressure oscillations inside the combustion chamber and the persistence time or cycle of the same oscillations, evaluating the behavior under fatigue conditions of the combustion chamber, by constructing the Wohler curve for a certain material which forms the combustion chamber for a predefined combustion frequency and for the amplitude and cycle values of the pressure oscillations measured, measuring the cumulative damage to the combustion chamber during functioning under fatigue conditions of the turbine using the Palmgren-Miner hypothesis and exerting protection actions of the turbine if the cumulative damage value measured is exceeded.
    Type: Grant
    Filed: April 7, 2008
    Date of Patent: October 21, 2014
    Assignee: Nuovo Pignone S.p.A.
    Inventor: Antonio Asti
  • Patent number: 8856557
    Abstract: An apparatus, system, and method are disclosed for providing power balancing for power supplies. A power module measures an amount of input power for each of a plurality of switching power supplies. A conversion module converts the measured amount of input power of each power supply to a digital power measurement signal. An averaging module determines an average amount of input power per power supply based on a summation of the digital power measurement signal of each power supply. A comparison module compares the digital power measurement signal of a power supply to the determined average amount of input power per power supply. An input power adjustment module adjusts the input power of the power supply to cause the amount of input power of the power supply to be substantially equal to the determined average amount of input power per power supply.
    Type: Grant
    Filed: June 3, 2010
    Date of Patent: October 7, 2014
    Assignee: International Business Machines Corporation
    Inventors: Robert DiMarco, Randhir S. Malik
  • Publication number: 20140292287
    Abstract: A semiconductor device, comprising first and second field effect transistors arranged in a cascode configuration: wherein the first field effect transistor is a depletion mode transistor; and wherein the second field effect transistor comprises a first source to gate capacitance and a second additional source to gate capacitance connected in parallel to the first source to gate capacitance. A power factor correction (PFC) circuit comprising the semiconductor device. A power supply comprising the PFC circuit.
    Type: Application
    Filed: March 13, 2014
    Publication date: October 2, 2014
    Applicant: NXP B.V.
    Inventors: Philip RUTTER, Maarten SWANENBERG
  • Publication number: 20140285163
    Abstract: A PFC circuit includes: a switching circuit having a power switch; an on time control circuit for controlling an on time period of the power switch; a first off time control circuit; a second off time control circuit; and a logic circuit selectively controls the power switch working under CCM or DCM; when working under CCM, the first off time control circuit controls an off time period of the power switch and when working under DCM, the second off time control circuit controls the off time period of the power switch.
    Type: Application
    Filed: March 21, 2014
    Publication date: September 25, 2014
    Inventors: Sicon Lin, Yiqing Jin, Yuancheng Ren, Junming Zhang
  • Publication number: 20140266081
    Abstract: An embodiment relates to a method for adjusting a dead zone, wherein an amplitude of an oscillating signal is determined, and wherein the dead zone is adjusted based on the amplitude of the oscillating signal.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 18, 2014
    Applicant: Infineon Technologies Austria AG
    Inventor: Alfredo Medina GARCIA