Plural Electrical Conditions Patents (Class 322/24)
  • Patent number: 10461677
    Abstract: There is provided a vehicle-power-generator control apparatus and the control method thereof that does not notify a passenger of any erroneous alarm indicating an abnormality in an electric power generator, even when a power-generation stop command is received. it is determined that a vehicle power generator is not rotating, when the rotation speed, of the vehicle power generator, that is detected based on a power-generation voltage generated across an armature winding of the vehicle power generator is the same as or lower than a predetermined value; there is generated a power-generation stop holding signal obtained by delaying by a predetermined time a time point at which a power-generation stop signal, generated when the decoded command signal is a power-generation stop command signal for stopping electric-power generation, stops; then, the non-rotation determination signal is masked and invalidated, based on the power-generation stop holding signal.
    Type: Grant
    Filed: September 13, 2017
    Date of Patent: October 29, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masahiro Nakajima, Junya Sasaki, Katsuyuki Sumimoto
  • Patent number: 10272901
    Abstract: A method and an apparatus for controlling MHSG of a mild hybrid electric vehicle, may include detecting data for controlling the MHSG; determining a target torque of an engine based on the data; determining whether a pressure difference between a front end portion and a rear end portion of a particulate filter is equal to or greater than a first pressure based on the data; determining a loss amount of combustion torque of the engine based on the pressure difference when the pressure difference is equal to or greater than the first pressure; and performing torque compensation control of the MHSG based on the target torque of the engine and the loss amount of the combustion torque of the engine.
    Type: Grant
    Filed: December 6, 2017
    Date of Patent: April 30, 2019
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventor: Hyun Kim
  • Patent number: 10232721
    Abstract: A circuit arrangement for detecting a zero crossing of an alternating current is provided. The circuit arrangement includes a load through which the alternating current can flow, and an evaluation unit connected to the load and configured to evaluate an electrical voltage formed at the load, and to determining zero currents. The load comprises a capacitor through which the alternating current or a current to be measured derived therefrom can flow, and the evaluation unit is configured to account for a phase shift caused by the capacitor for determining the zero currents.
    Type: Grant
    Filed: September 15, 2014
    Date of Patent: March 19, 2019
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Manuel Blum, Thomas Komma, Mirjam Mantel, Monika Poebl
  • Patent number: 10012199
    Abstract: Provided is a power conversion device that can suppress a surge to be generated when a load, such as a battery, is disconnected from an output of an AC generator. A rectifier circuit connected between an output portion of the AC generator and a first load rectifies the output of the AC generator and supplies the rectified output to the first load. A switch circuit connected between the output portion of the AC generator and the second load rectifies the output of the AC generator and supplies the rectified output to the second load, on condition that a drive signal is in a first signal state indicating permission of a power supply from the AC generator to the second load. Additionally, the switch circuit transitions from a conductive state to a non-conductive state in response to the output of the AC generator, on condition that the drive signal is in a second signal state indicating prohibition of the power supply from the AC generator to the second load.
    Type: Grant
    Filed: May 30, 2014
    Date of Patent: July 3, 2018
    Assignee: SHINDENGEN ELECTRIC MANUFACTURING CO., LTD.
    Inventor: Tokihiko Iwakura
  • Patent number: 9876454
    Abstract: Automatic voltage regulation is shown involving full wave rectifying a power signal and generating a reference corresponding to an operating voltage level, line sampling the power signal and comparing it to the reference to generate a line sync signal synchronized to the power signal. Producing 90° out of phase signals synchronized to the line sync signal with a PLL locked onto the line sync signal that outputs a phase error signal. Generating a quadrature signal from the phase signals. Sampling the peaks of the rectified power signal using the quadrature signal to produce a control signal. Subtracting the error signal and damping signal from the reference to produce a duty cycle modulation signal. The duty cycle modulation signal controls a duty cycle of a field voltage control signal that oscillates at a predetermined frequency. The field voltage control signal is low-pass filtered to produce the damping signal.
    Type: Grant
    Filed: May 23, 2016
    Date of Patent: January 23, 2018
    Inventor: Alonso Rodriguez
  • Patent number: 9640997
    Abstract: A power grid of renewable sources is stabilized. Inverters for connecting power sources, such as wind turbines, batteries, or photovoltaics, to a grid are used to damp grid oscillations. The damping is distributed to the inverters, but based on measurements for the grid rather than local measurements. The control of the damping is based on grid wide analysis, and the damping is performed proportionately by already existing inverters distributed throughout the grid.
    Type: Grant
    Filed: July 30, 2012
    Date of Patent: May 2, 2017
    Assignee: Siemens Corporation
    Inventors: Divya Kurthakoti Chandrashekhara, Yaosuo Xue
  • Patent number: 9528499
    Abstract: A power oscillation damping controller is provided for a power generation device such as a wind turbine device. The power oscillation damping controller receives an oscillation indicating signal indicative of a power oscillation in an electricity network and provides an oscillation damping control signal in response to the oscillation indicating signal, by processing the oscillation damping control signal in a signal processing chain. The signal processing chain includes a filter configured for passing only signals within a predetermined frequency range.
    Type: Grant
    Filed: June 10, 2011
    Date of Patent: December 27, 2016
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Thyge Knüppel, Sathees Kumar, Patrik Thuring
  • Patent number: 9197151
    Abstract: Disclosed is an alternator overvoltage protection circuit having a TRIAC and a MOSFET. The TRIAC is electrically connected to the MOSFET and the TRIAC is electrically connected to a magneto. The TRIAC is configured to ground the magneto when triggered by the MOSFET. The MOSFET is electrically connected to an alternator and configured to conduct when the alternator operates in an overvoltage condition. Also disclosed is a method of alternator overvoltage protection for a piece of outdoor power equipment, the method including providing a TRIAC and an alternator rotated by an engine having a magneto, wherein the alternator outputs a voltage when rotated by the engine. The method further includes configuring the TRIAC to ground the magneto when the alternator operates in an overvoltage condition, thereby disabling the magneto, which stops the rotation of the engine and stops the alternator from outputting voltage.
    Type: Grant
    Filed: January 3, 2014
    Date of Patent: November 24, 2015
    Assignee: MTD Products Inc
    Inventor: Maynard S. Guadiz
  • Patent number: 9186378
    Abstract: A method of starting a wind turbine generator of any type of polyphase AC machine, including, but not limited to, brushless DC or permanent magnet machines is disclosed. The machine starts from a dead stop or from low speed operation and is accelerated to the cut in speed for power production. The start-up is realized utilizing the common set of electrical conductors and the power converter also used for capturing the generated power. Under initial operation, the power converter executes a PWM modulation technique to drive the machine. Periodically, the PWM modulation is stopped to read the electrical position of the generator.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: November 17, 2015
    Assignee: EnSync, Inc.
    Inventors: Jeffrey A. Reichard, Nathan Jobe, Thomas Alan Laubenstein
  • Patent number: 9154069
    Abstract: An integrated generation control system includes at least one integrated control module, a rectification module, a communication module, a rectifier, a permanent magnet alternator, a generator, a maintenance module, a local control unit and a battery. The integrated control module includes an automatic voltage regulator, a power system stabilizer and an extensive gate controller. The rectification module is connected to the integrated control module. The communication module is arranged between the integrated control module and the rectification module. The rectifier is connected to the integrated control module and the rectification module. The permanent magnet alternator is connected to the rectifier. The generator is connected to the integrated control module.
    Type: Grant
    Filed: April 2, 2012
    Date of Patent: October 6, 2015
    Assignee: INSTITUTE OF NUCLEAR ENERGY RESEARCH ATOMIC ENERGY COUNCIL, Executive Yuan, R.O.C.
    Inventor: Ting-Chia Ou
  • Publication number: 20150123625
    Abstract: An arrangement for controlling a synchronous generator having a stator comprising at least one stator winding and having a rotor with an electromagnet driven by a field current is provided. The rotor is rotatable relative to the stator. The electromagnet is inductively coupled to the at least one stator winding. The arrangement includes a measurement system configured to measure at least one quantity and a controller configured to cause shutting down the field current when the at least one quantity satisfies at least one criterion associated with at least one malfunction.
    Type: Application
    Filed: March 25, 2013
    Publication date: May 7, 2015
    Inventor: Espen Haugan
  • Publication number: 20150115903
    Abstract: A vehicular charging system includes: a generator which has a field coil and is mounted on a vehicle; a storage battery which stores power; a storage state detection sensor which detects a charge state; and a power generation driving torque control device which calculates an actual value and a target value of power generation driving torque of the generator, and controls the generator based on the calculated target value. The power generation driving torque control device controls the generator based on a first target value of the power generation driving torque when a running state of the vehicle moves into a deceleration mode, and decreases the power generation driving torque to control the generator based on a second target value of the power generation driving torque when a charge state of the storage battery reaches a reference value, the second target value being smaller than the first target value.
    Type: Application
    Filed: April 10, 2014
    Publication date: April 30, 2015
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Keisuke KATSURADA, Wakaki MIYAJI
  • Patent number: 9002529
    Abstract: The present invention discloses a method and an apparatus for power control. An apparatus for power control in accordance with an embodiment of the present invention can include: a voltage comparing part configured to compute an error voltage by using a measured voltage measured at the generator and a reference voltage that is designated; a control module configured to compute a first reactive power value for power control of the generator by being inputted with the error voltage; and a driving module configured to compute a reference reactive power value by using the first reactive power value and a second reactive power value computed using an active power value of the power converter and configured to control the power converter in correspondence with the computed reference reactive power value.
    Type: Grant
    Filed: December 2, 2010
    Date of Patent: April 7, 2015
    Assignee: Samsung Heavy Ind. Co., Ltd.
    Inventors: Hee Sang Ko, Jung Hoon Kim, Won Deok Baek, Tai Yeon Cho
  • Patent number: 8964337
    Abstract: Systems and methods for monitoring excitation of a generator based on a faulty status of a generator breaker are provided. According to one embodiment, a system may include a controller and a processor communicatively coupled to the controller. The processor may be configured to receive, from a contact associated with a generator breaker, a reported status of the generator breaker, receive operational data associated with one or more parameters of a generator associated with the generator breaker, and correlate the reported status of the generator breaker and the operational data. Based on the correlation, the processor may establish an actual status of the generator breaker, and, based on the actual status, selectively modify a mode of excitation of the generator.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: February 24, 2015
    Assignee: General Electric Company
    Inventors: Abhinandan Sharma, Shashidhar Nibhanupudi, Sridhar Nedunsezian
  • Publication number: 20150008889
    Abstract: Provided is a power-generation control device capable of appropriately using a drive belt looped around a power generator and an internal-combustion engine mounted on a vehicle. The device monitors a difference between an actual generated current of a rotating electrical machine and an estimated generated current estimated from estimated power-generation torque for controlling power generation of the rotating electrical machine, which corresponds to a power-generation torque command, or the like. When a difference equal to or more than a predetermined value occurs between the actual and the estimated generated currents, the power-generation control device limits the estimated power-generation torque so as to be reduced, and further limits the estimated power-generation torque with use of learning limiting power-generation torque calculated based on the estimated power-generation torque at a time when the difference has occurred between the actual generated current and the estimated generated current.
    Type: Application
    Filed: April 11, 2012
    Publication date: January 8, 2015
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kensuke Hayashi, Keiichi Enoki, Yoshimasa Nishijima
  • Patent number: 8928292
    Abstract: An integrated power system suitable for simultaneously powering marine propulsion and service loads. The system includes: (a) at least one generator configured with at least first and second armature windings configured to output respective first and second alternating current power signals of different voltages, the at least two armature windings positioned within the same stator slots so that they magnetically couple; (b) at least first and second rectifier circuits coupled to said generator to convert said first and second alternating current power signals into first and second direct current power signals; and (c) a first load to which said first direct current power signal is coupled and a second load to which said second direct current power signal is coupled.
    Type: Grant
    Filed: August 24, 2009
    Date of Patent: January 6, 2015
    Assignee: DRS Power & Control Technologies, Inc.
    Inventors: Gene Castles, Edgar S. Thaxton
  • Patent number: 8922173
    Abstract: A DC chopper comprising a control unit and a power circuit and a DC chopping method for a DFIG (doubly fed induction generator) system are provided. The input terminal of the control unit is coupled to a DC capacitor of a converter to detect a DC voltage. The power circuit includes input terminals, an overvoltage protection module, a rectifier module and output terminals. The overvoltage protection module comprises at least one discharge unit formed from a discharge resistor and a switch element, and the rectifier module is coupled in parallel to the overvoltage protection module. When a grid voltage drops, the control unit outputs a corresponding control signal to drive the switch element to be ON or OFF, and the output terminal of the power circuit absorbs a portion of rotor inrush current, so as to impose over-current protection.
    Type: Grant
    Filed: June 25, 2012
    Date of Patent: December 30, 2014
    Assignee: Delta Electronics (Shanghai) Co., Ltd.
    Inventors: Chang-Yong Wang, Jian-Fei Zheng, Fei Lu, Jian-Ping Ying
  • Patent number: 8912765
    Abstract: A generator system includes a generator having a stationary portion and a rotating portion. The generator includes a permanent magnet based exciter with permanent magnets disposed on the stationary portion. A first channel includes a first main field winding and a first main field power converter disposed on a rotating portion. The first main field power converter selectively delivers voltage from the exciter winding to the first main field winding. A second channel includes a second main field winding and a second main field power converter disposed on the rotating portion. The second main field power converter selectively delivers voltage from the exciter winding to the second main field winding. A generator control unit is connected to the first channel and the second channel. The generator control unit monitors an output voltage at each of the first channel and the second channel and generates the first and second control signals based on the output voltage.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: December 16, 2014
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Gregory I. Rozman, Jacek F. Gieras, Steven J. Moss
  • Patent number: 8901896
    Abstract: An electrical generator includes a stator having fractional-slot concentrated windings and a rotor having field windings. A drive is provided having a circuit to control current flow to the field windings and a controller to input an initial DC field current demand to the circuit to cause the circuit to output an initial DC field current representative of a DC field current demand that would cause an electrical generator having sinusoidal stator windings to output a desired AC power. The controller receives feedback on the magnetic field generated by the initial DC field current, isolates an ideal fundamental component of the magnetic field based on the feedback and to generate a modified DC field current demand, and inputs the modified DC field current demand to the circuit, thereby causing the circuit to output an instantaneous non-sinusoidal current to the field windings to generate a sinusoidal rotating air gap magnetic field.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: December 2, 2014
    Assignee: General Electric Company
    Inventors: Ahmed Mostafa El-Antably, Ayman Mohamed Fawzi El-Refaie, Robert Dean King
  • Patent number: 8890492
    Abstract: Starting and stopping an engine is automatically controlled based on a load without using a relay. An inverter engine-driven power generator has an alternator, a rectifying circuit, a DC/DC converter, and an inverter circuit. A load detection circuit is connected to an output of the inverter circuit in parallel. A load detection line of the load detection circuit is connected to an output line of the inverter circuit in parallel via resistors. A power supply formed of a battery is connected to the load detection line. A decision circuit outputs a load detection signal when a current having a preset value or more flows through the load detection line. A drive/stop CPU starts the engine in response to the load detection. The resistors are set at a resistance value which does not influence a load to which a generator output is supplied.
    Type: Grant
    Filed: May 2, 2011
    Date of Patent: November 18, 2014
    Assignee: Honda Motor Co., Ltd.
    Inventors: Masanori Ueno, Makoto Ogawa
  • Patent number: 8854016
    Abstract: A power supply apparatus capable of setting a ripple current to be not more than an acceptable value regardless of an input voltage is obtained. The apparatus calculates switching frequency by a current detected by a current detector so that the switching frequency is set to be low if the current is large and the switching frequency is set to be high if the current is small. The switching frequency is set to be high if the input voltage is high and switching frequency is set to be low if the input voltage is low depending on a voltage inputted to an input terminal; and a switching element is controlled by restricting the switching frequency so that the switching frequency to be set by the current detected by the current detector is not lower than the switching frequency to be set by the input voltage.
    Type: Grant
    Filed: March 21, 2014
    Date of Patent: October 7, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Toru Daigo, Nobuhiro Kihara, Naoki Itoi
  • Publication number: 20140266076
    Abstract: A generator system includes a generator having a stationary portion and a rotating portion. The generator includes a permanent magnet based exciter with permanent magnets disposed on the stationary portion. A first channel includes a first main field winding and a first main field power converter disposed on a rotating portion. The first main field power converter selectively delivers voltage from the exciter winding to the first main field winding. A second channel includes a second main field winding and a second main field power converter disposed on the rotating portion. The second main field power converter selectively delivers voltage from the exciter winding to the second main field winding. A generator control unit is connected to the first channel and the second channel. The generator control unit monitors an output voltage at each of the first channel and the second channel and generates the first and second control signals based on the output voltage.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Applicant: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Gregory I. Rozman, Jacek F. Gieras, Steven J. Moss
  • Patent number: 8836292
    Abstract: An electric power generation system and method that permits enhanced power generation efficiency when applied to rotating electric power generation systems is disclosed. The system may be broadly described as generally improving energy generation efficiency by improving the efficiency of electric current extraction from stator coils in many alternator-based electric power generation systems. The system disclosed comprises a number of preferred embodiments, some of which utilize buck-boost converter technologies in conjunction with super-diode excitation/rectification to minimize I2R power losses within rotating power generation system components while at the same time reducing heat losses and thus increasing overall rectification circuitry system reliability.
    Type: Grant
    Filed: April 15, 2011
    Date of Patent: September 16, 2014
    Inventor: Kevin Mark Klughart
  • Patent number: 8829862
    Abstract: A motor vehicle regulator, including electronic regulation circuits, which can produce an excitation current in accordance with a difference between a set voltage and an output voltage measured at the terminals of an electric battery of the vehicle. The regulation circuits including a programmable signal processing interface for producing a signal, which is representative of the excitation current. The interface receives as input a plurality of signals which are representative of the excitation current. The interface including a device capable of selecting a signal which is representative, from amongst the plurality of representative signals, of the method for applying different forms of processing to the representative signal selected, and a second device for selection of processing to be applied to the representative signal. The representative signal, and the processing to be applied, being selected according to a program provided to the programmable signal interface.
    Type: Grant
    Filed: October 15, 2009
    Date of Patent: September 9, 2014
    Assignee: Valeo Equipements Electriques Moteur
    Inventors: Pierre Chassard, Pierre Tisserand, Vincent Gendron, Philippe Hazard
  • Patent number: 8829863
    Abstract: A field winding type rotary electric machine includes: a controller; a field current integration portion provided in the controller to calculate an integral value by integrating an excessive field current exceeding a field current threshold; a field current limiting portion provided in the controller and carrying out limiting processing to limit a field current to or below a predetermined value when the integral value reaches an integral value threshold defined as a reference value at or above which the field current is limited; a controller power supply connection switch switched ON and OFF for power feeding to the controller; a controller power supply connection determination portion switching ON and OFF the controller power supply connection switch; and a power feeding ON state maintaining portion maintaining an ON state of the power feeding to the controller from start to end of the limiting processing by the field current limiting portion.
    Type: Grant
    Filed: December 16, 2011
    Date of Patent: September 9, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kenichi Akita, Kenji Nakajima, Masato Mori, Mitsunori Tabata
  • Patent number: 8816605
    Abstract: An adaptive sliding-frequency triggering ignition method for electronic ballast of high pressure gas discharge lamp includes the steps of: measuring an accurate value of free oscillation frequency of the ballast load loop by using a single-chip before sliding-frequency triggering ignition, implementing safe and reliable sliding-frequency triggering ignition after calculating the initial frequency and ending frequency of sliding-frequency triggering ignition according to the accurate value. The method can safely and reliably finish sliding-frequency triggering ignition course, thus improving the parameters such as the quality, life of the high pressure gas discharge lamp electronic ballast.
    Type: Grant
    Filed: October 21, 2008
    Date of Patent: August 26, 2014
    Inventor: Zheng He
  • Patent number: 8803488
    Abstract: A power supply apparatus capable of setting a ripple current to be not more than an acceptable value regardless of an input voltage is obtained. The apparatus calculates switching frequency by a current detected by a current detector so that the switching frequency is set to be low if the current is large and the switching frequency is set to be high if the current is small. The switching frequency is set to be high if the input voltage is high and switching frequency is set to be low if the input voltage is low depending on a voltage inputted to an input terminal; and a switching element is controlled by restricting the switching frequency so that the switching frequency to be set by the current detected by the current detector is not lower than the switching frequency to be set by the input voltage.
    Type: Grant
    Filed: September 2, 2011
    Date of Patent: August 12, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Toru Daigo, Nobuhiro Kihara, Naoki Itoi
  • Patent number: 8797002
    Abstract: The control device including: a power transistor (502) for controlling conduction/non-conduction of a field coil (3) in accordance with an output voltage of an AC generator (1) mounted on a vehicle; an RPM detection section (511) for detecting an RPM of the AC generator (1); a drive duty setting section (510) for determining whether or not the RPM detected by the RPM detection section (511) is equal to or higher than a predetermined threshold, and reducing a conduction ratio of the field coil (3) when determining that the RPM is equal to or higher than the predetermined threshold; and a driver (504) for driving the power transistor (502) based on the conduction ratio. In this manner, the conduction ratio of the field coil (3) is reduced to suppress the drive torque.
    Type: Grant
    Filed: November 26, 2012
    Date of Patent: August 5, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Keiichi Komurasaki, Kazunori Tanaka, Katsuyuki Sumimoto
  • Patent number: 8773080
    Abstract: An alternator has a field coil that produces a magnetic field which induces electricity in an coil arrangement. A field coil excitation system includes a generator with an output coil assembly for producing alternating electricity. A rectifier converts the alternating electricity into voltage and direct current at two nodes. A capacitor, between the nodes, has capacitance that forms a resonant circuit with inductance of the output coil assembly. Due to that resonant circuit, the voltage and direct current oscillate in a predefined phase relationship. A switch and the field coil are connected in series between the nodes. A controller renders the switch conductive for a time period specified by a received control signal. The switch is rendered non-conductive at the first occurrence of a minimum current level after the time period ends. The predefined phase relationship enables the minimum current level to be detected by sensing the voltage.
    Type: Grant
    Filed: December 16, 2010
    Date of Patent: July 8, 2014
    Assignee: Kohler Co.
    Inventor: Eric D. Albsmeier
  • Patent number: 8749205
    Abstract: In a control device for a vehicle AC generator, a voltage control includes target voltage adjusting means for adjusting a target voltage value in response to a target change command from an external control unit and a gradual excitation control circuit that controls an excitation duty to increase according to an excitation duty control characteristic when a vehicle load increases and when the target voltage adjusting means varies the target voltage value to a lower value. The gradual excitation control circuit includes duty characteristic varying means for varying the excitation duty control characteristic. The duty characteristic varying means varies a rate of increase of the excitation duty in a predetermined region of the excitation duty control characteristic in comparison with its other region.
    Type: Grant
    Filed: November 20, 2009
    Date of Patent: June 10, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Junya Sasaki, Katsuyuki Sumimoto
  • Patent number: 8736233
    Abstract: A power source device for rectifying the output of an AC generator in which magneto coils are in a star-shaped connection in three phases. The device includes a control rectifier circuit configured from a first control rectifier circuit for performing full-wave rectification on three-phase AC voltages, and a second control rectifier circuit for performing full-wave rectification on AC voltages obtained between neutral and each of two-phase AC output terminals selected from the three-phase AC output terminals of the generator, as well as on AC voltage obtained between the selected two-phase AC output terminals; and a controller controlling the first and second circuits so that the output of the first circuit is supplied to the load when the rotational speed of the generator is equal/less than a set speed, and the output of the second circuit is supplied to the load when the rotational speed exceeds the set speed.
    Type: Grant
    Filed: August 24, 2012
    Date of Patent: May 27, 2014
    Assignee: Kokusan Denki Co., Ltd.
    Inventors: Shuichi Muramatsu, Ryosuke Tonooka, Shinji Komatsu, Nozomu Katsumata, Masaki Asari, Hirofumi Yamaguchi
  • Patent number: 8680819
    Abstract: A field winding type rotary electric machine includes a motor generator; a field current detection unit; a field current control unit which controls a field current; a field current limiting determination section which calculates a field current integration value and determines whether or not the field current integration value reaches a predetermined field current integration threshold value; and a field current limiting command section which, when it is determined that the field current integration value reaches the predetermined field current integration threshold value, outputs a command which sets the field current to be lower than or equal to a predetermined field current limiting value to the field current control unit during a predetermined limiting time, and outputs a command which changes the predetermined limiting time depending on the field current. Accordingly, a temperature rise of the machine is suppressed and limiting of the field current can be released as needed.
    Type: Grant
    Filed: March 28, 2011
    Date of Patent: March 25, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kenichi Akita, Masato Mori, Kenji Nakajima, Mitsunori Tabata
  • Publication number: 20140070535
    Abstract: A method and system for dissipating energy in a direct current (dc) bus of a doubly-fed induction generator (DFIG) converter during a grid event is described. In one aspect, the method comprises monitoring operating conditions of an electrical system, the electrical system comprising at least a DFIG generator and a line side converter and a rotor side converter connected by a dc bus having a dynamic brake connected thereto; detecting an overvoltage on the dc bus or a condition indicative of an overvoltage on the dc link is detected, the overvoltage on the dc bus or condition indicative of the overvoltage caused by a grid event; and causing energy in the dc link to be dissipated using the dynamic brake.
    Type: Application
    Filed: September 7, 2012
    Publication date: March 13, 2014
    Inventors: Robert Gregory Wagoner, Allen Michael Ritter, Einar Vaughn Larsen, Anthony Michael Klodowski, Sidney Allen Barker
  • Publication number: 20140062424
    Abstract: In one aspect, a method for controlling a dual-fed induction generator (DFIG) during a high-voltage grid event is provided. The method includes setting, by a controller, an output of a closed-loop portion of a rotor current regulator to a fixed value such that a predictive feed-forward path sets an internal voltage for the DFIG; and detecting, by the controller, a condition of high dc voltage on a dc link or a condition predictive of high dc voltage on the dc link, and in response reduce a rotor torque producing current command to approximately zero, wherein the dc link connects a line-side converter connected to a system bus and a rotor-side converter connected to a rotor of the DFIG.
    Type: Application
    Filed: August 31, 2012
    Publication date: March 6, 2014
    Inventors: Einar Vaughn Larsen, Anthony Michael Klodowski, Sidney Allen Barker
  • Publication number: 20140049228
    Abstract: The invention relates to a synchronous power controller for a generation system based on static power converters, said controller comprising two main blocks referred to as: block 1 (electric block) (10) and block 2 (electromechanical block) (20), electric block 1 (10) being, in turn, formed by a virtual electrical characteristic controller (11) and a virtual 10 admittance controller (12) and the electromechanical block 2 (20) being formed by a virtual electromechanical characteristic controller (21) and an inertia and damping factor controller (22).
    Type: Application
    Filed: February 27, 2012
    Publication date: February 20, 2014
    Inventors: Pedro Rodríguez Cortés, José Ignacio Candela Garcia, Joan Rocabert Delgado, Remus Teodorescu
  • Patent number: 8648574
    Abstract: A power generator has a battery and an alternator driven by an engine. The battery assists a power energy of the alternator. An inverter circuit is connected to an output of a rectifying circuit. A DC/DC converter boosts a voltage of the battery and inputs the boosted voltage into a constant power regulator. The constant power regulator boosts an input voltage and secures a certain power. An output voltage of the rectifying circuit is monitored by a monitoring means and an output voltage of the battery is monitored by a monitoring means. When the output voltage of the rectifying circuit is equal to or less than a rated voltage, an auxiliary power value corresponding to the remaining amount of the battery is set as a power target value of the constant power regulator.
    Type: Grant
    Filed: April 28, 2011
    Date of Patent: February 11, 2014
    Assignee: Honda Motor Co., Ltd.
    Inventors: Masanori Ueno, Makoto Ogawa
  • Patent number: 8618776
    Abstract: In a power generator, three-phase armature windings and a switching unit are provided for each phase armature winding. The switching unit includes a pair of a high-side switching element with a first diode and a second low-side switching element with a second diode. The switching unit rectifies, through at least one of the high-side switching element, the first diode, the second low-side switching element, and the second diode, a voltage induced in each phase armature winding. A zero-cross detector detects a point of time when a phase current based on the voltage induced in each phase armature winding is reversed in direction as a zero-cross point of the phase current. A determiner determines an off timing of the high-side switching element or the low-side switching element for each phase armature winding relative to the zero-cross point detected by the zero-cross detector.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: December 31, 2013
    Assignee: Denso Corporation
    Inventor: Harumi Horihata
  • Patent number: 8593114
    Abstract: The present invention relates to a control device for a doubly-fed induction generator in which a feedback linearization method is enabled and further provides a control device for a doubly-fed induction generator in which a feedback linearization method is embedded, characterized in that the control device divides and measures positive sequency components and negative sequency components from stator voltage and current, rotor voltage and current, and signals of stator magnetic flux and rotor magnetic flux of the doubly-fed induction generator.
    Type: Grant
    Filed: December 27, 2010
    Date of Patent: November 26, 2013
    Assignee: Korea Electrotechnology Research Institute
    Inventors: Jung Woo Park, Dae Wook Kang, Ji Woo Moon, Jin Soo Kwon, Deuk Woo Pae, Chang Hun Oh
  • Patent number: 8581558
    Abstract: A control device for a vehicle AC generator, in which a part can be shared even when electrical configuration positions of field coils of rotors of generators are different, is obtained. Switching elements connected in series to the field coil in order to control a field current; and a control signal processing unit, in which information as to whether the field coil is connected to the high potential side or connected to the low potential side is inputted, one of the high potential side terminal and the low potential side terminal is selected on the basis of the inputted information, a control signal is outputted, and ON/OFF control of the switching element is performed to control the field current of the field coil, are provided.
    Type: Grant
    Filed: December 16, 2010
    Date of Patent: November 12, 2013
    Assignee: Mitsubishi Electric Corporation
    Inventors: Katsuyuki Sumimoto, Noriyuki Wada
  • Patent number: 8570003
    Abstract: A double fed induction generator (DFIG) system and controller are presented in which the rotor side converter is preloaded with one or more initial values for resuming regulated operation to counteract transients upon deactivation of the crowbar protection circuit to provide grid fault ride through.
    Type: Grant
    Filed: April 13, 2011
    Date of Patent: October 29, 2013
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Haihui Lu, Zhenhuan Yuan, Lixiang Wei, Russel Kerkman, Richard Lukaszewski, Ahmed Mohamed Sayed Ahmed
  • Patent number: 8525489
    Abstract: A system for directly and instantaneously controlling the exciter of a generator. A voltage error calculator calculates a voltage error of output voltage of the generator which is regulated by an instruction voltage and a time constant. A switching signal generator generates switching signals in response to the voltage error. An exciter controller controls the exciter in response to the switching signals. Thus, the system can induce the maximum response characteristic of a power converter only by setting the time constant of a controller without a complicated design for determining gains of the controller. Further, the system can considerably inhibit overshoot from occurring in a transient response state.
    Type: Grant
    Filed: October 2, 2008
    Date of Patent: September 3, 2013
    Assignee: Kyungsung University Industry Cooperation Foundation
    Inventors: Jinwoo Ahn, Donghee Lee
  • Patent number: 8513924
    Abstract: The vehicle generator includes an armature winding including a plurality of phase windings, a switching section formed as a bridge circuit constituted of a plurality of pairs of an upper arm and a lower arm connected in series to rectify voltages induced in the phase windings, each of the upper and lower arms being constituted of a switching element parallel-connected with a diode, a control section for controlling on/off timings of the switching elements, and a voltage zero-cross detecting section for performing voltage zero-cross detection to detect, as voltage zero-cross points, time points at which at least one of line-to-line voltages among the phase windings of the armature winding changes in polarity. The control section is configured to start on-off control of the switching elements based on the voltage zero-cross points detected by the voltage zero-cross detecting section.
    Type: Grant
    Filed: February 18, 2011
    Date of Patent: August 20, 2013
    Assignee: Denso Corporation
    Inventor: Harumi Horihata
  • Patent number: 8513911
    Abstract: A power converter that interfaces a motor requiring variable voltage/frequency to a supply network providing a nominally fixed voltage/frequency includes a first rectifier/inverter connected to a stator and a second rectifier/inverter. Both rectifier/inverters are interconnected by a dc link and include switching devices. A filter is connected between the second rectifier/inverter and the network. A first controller for the first rectifier/inverter uses a dc link voltage demand signal indicative of a desired dc link voltage to control the switching devices of the first rectifier/inverter. A second controller for the second rectifier/inverter uses a power demand signal indicative of the level of power to be transferred to the dc link from the network through the second rectifier/inverter, and a voltage demand signal indicative of the voltage to be achieved at network terminals of the filter to control the switching devices of the second rectifier/inverter.
    Type: Grant
    Filed: August 22, 2011
    Date of Patent: August 20, 2013
    Assignee: Converteam Technology Ltd.
    Inventors: Rodney Jones, Christopher Newton
  • Patent number: 8497664
    Abstract: A generator system that includes a six-phase AC machine and an active rectifier bridge employing low on-resistance switches, such as MOSFET switches, for converting the AC current from the machine to a DC current. The system also includes a switch control circuit to switch the MOSFET switches in synchronization with the six-phase current flow. The system determines the phase-to-ground voltages of the machine for inputs to the switch control circuit. The control circuit calculates the phase-to-phase voltages from the phase-to-ground voltages. The control circuit uses a specific control scheme to determine if each of the phase-to-phase voltages is above or below first and second predetermined threshold voltages, where if the phase-to-phase voltage is above the first threshold voltage, the control circuit closes the switch, and if the phase-to-phase voltage is below the second threshold voltage, the control circuit opens the switch.
    Type: Grant
    Filed: November 19, 2009
    Date of Patent: July 30, 2013
    Assignee: GM Global Technology Operations LLC
    Inventors: Lei Hao, Chandra S. Namuduri
  • Patent number: 8476871
    Abstract: The present invention relates to a method and system for controlling a doubly-fed induction machine. In operation a rotor current vector is processed with a rotor position estimate vector. A scalar error quantity is the determined in dependence upon a stator current vector and the processed rotor current vector. The scalar error quantity is integrated and an estimate of the rotor angular frequency is determined in dependence upon the integrated scalar error quantity. To obtain a rotor position estimate, the estimate of the rotor angular frequency is integrated and a rotor position estimate vector is determined in dependence upon the rotor position estimate. The rotor position estimate vector is then provided for processing the rotor current vector. As output signals a signal indicative of the rotor position estimate vector and a signal indicative of the estimate of the rotor angular frequency are provided for controlling the doubly-fed induction machine.
    Type: Grant
    Filed: November 28, 2007
    Date of Patent: July 2, 2013
    Assignee: The Royal Institution for the Advancement of Learning/McGill University
    Inventors: Boon T. Ooi, Baike Shen, Victor Low
  • Patent number: 8456138
    Abstract: A programmable system includes a first level protection circuit comprised of discharge tube CR1/ CR2 and piezoresistor MOV1/MOV2 in series; a second-level protection circuit comprised of the series arm of capacitor C1 and resistor R1 in parallel with a transient voltage suppression diode TVS1, and inductors L1/L2 connected to the ends of first level and second-level protection circuits respectively. A control circuit includes a PWM driver module and a SCM. The PWM driver module is connected to the PWM control port of the SCM and its output is connected to an IGBT module. The control circuit is also connected to a series communication module and to a user interface. The features of the invention are: strong-shock resistance; a wide range of load adaptability; and ability of accurately and steplessly regulating and adjusting with high frequency and high power load.
    Type: Grant
    Filed: July 14, 2010
    Date of Patent: June 4, 2013
    Assignees: MacMic Science & Technology Co., Ltd., Luxtech 360 LLC.
    Inventors: Xishe Lei, Xiao Bao Wang
  • Publication number: 20130119948
    Abstract: A vehicle electrical system comprises a generator, voltage regulator, switch module, and control device. The generator includes a field coil and one or more stator windings coupled together via the switch module. The generator provides electrical current to one or more electrical loads. The voltage regulator maintains the generator output voltage at a constant voltage by varying the field current. The switch module may include low-power transistors. The control device monitors the field current, output voltage and stator current and applies control signals to the switch module to improve transient recovery due to sudden variations in the electrical load and increase system efficiency during normal operation.
    Type: Application
    Filed: November 16, 2011
    Publication date: May 16, 2013
    Inventor: Stoyan Borissov Bekiarov
  • Patent number: 8432137
    Abstract: A method for generating and controlling power by means of at least one controlled permanent magnet machine (PMM) with a permanent magnet (PM) rotor and a stator with a magnetic flux diverter circuit for controlling the output of the PMM, comprises the steps of: rotating the PM rotor at a velocity sufficient to develop a high frequency alternating current (HFAC) power output from the stator; transforming the HFAC output to produce a desired non-HFAC power output; sensing desired power output parameters; generating a control signal responsive to the sensed parameters; and applying the control signal to the magnetic flux diverter circuit to control the desired power output.
    Type: Grant
    Filed: May 19, 2009
    Date of Patent: April 30, 2013
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Gregory I. Rozman, Vietson M. Nguyen, Jacek F. Gieras, Sastry V. Vedula
  • Patent number: 8415930
    Abstract: Provided is a power supply device including: a magneto generator (1), which includes: a rotor including a magnet forming a magnetic field; and a stator which generates an alternating current in stator windings by rotation of the rotor; a rectifying unit (3) which rectifies the alternating current generated by the magneto generator to a direct current; a variable transformation-ratio direct current voltage transformer (40) which transforms an output voltage of the direct current of the rectifying unit to a voltage between input terminals of an electrical load (2) to which electric power is supplied; and a voltage control unit (5) which controls a transformation ratio of the variable transformation-ratio direct current voltage transformer in accordance with at least one of an operating state signal regarding the rotation of the rotor of the magneto generator and an electrical load state signal of the electrical load.
    Type: Grant
    Filed: May 3, 2010
    Date of Patent: April 9, 2013
    Assignee: Mitsubishi Electric Corporation
    Inventors: Nobuhiro Kihara, Masayoshi Maeda, Shinji Kawaguchi, Hiroshi Okuda, Fumito Uemura, Takahiro Urakabe, Masaya Inoue, Naoki Itoi, Kenji Ishi
  • Patent number: 8410761
    Abstract: A control circuit for use with an AC alternator has a plurality of outlet lines leading from the alternator, each receiving a phase of current generated by the alternator. Tap lines are associated with each of the power lines and are associated with a switch. The switches drain power to a drain when in a first state, and allow the power to pass downstream to a system load when in a second state. A switch control changes the switches between the first and second state. A detector detects when the current signal is approaching a zero crossing between a cycle positive portion and a negative portion. The switch control takes in the information with regard to the approaching zero crossing, and change the switches between the first and second states based upon the detected zero crossing point. An alternator is also disclosed.
    Type: Grant
    Filed: August 2, 2010
    Date of Patent: April 2, 2013
    Assignee: Hamilton Sundstrand Corporation
    Inventor: Thomas Bekasi