With Compensation Patents (Class 323/356)
  • Patent number: 10297383
    Abstract: A device for reducing a magnetic unidirectional flux component in the core of a three-phase transformer includes at least one compensation winding, which is magnetically coupled to the core of the three-phase transformer, a switch arranged electrically in a current path in series with the at least one compensation winding to feed current into the winding, where the effect of the current is directed opposite to the unidirectional flux component, and an apparatus for limiting current arranged electrically in a current path in series with the at least one compensation winding, and where two compensation windings are provided on different legs of the core of the three-phase transformer such that a greater reduction of the magnetic unidirectional flux component is achieved.
    Type: Grant
    Filed: December 10, 2013
    Date of Patent: May 21, 2019
    Assignee: Siemens Aktiengesellschaft
    Inventor: Peter Hamberger
  • Patent number: 10298037
    Abstract: Embodiments describe a charging component for an electronic device that includes an interface surface comprising a portion of an external surface of a housing of the electronic device; a plurality of contacts positioned at the interface surface and exposed for making contact with contacts of a connector; one or more sensors for detecting a separation event; an inductor coil positioned proximate to the interface surface, wherein a central axis of the inductor coil is perpendicular to at least a portion of the interface surface; and a processor coupled to the inductor coil and the one or more sensors, wherein the processor is configured to change an operation of the inductor coil based at least in part on a measurement from the one or more sensors.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: May 21, 2019
    Assignee: Apple Inc.
    Inventors: Paul X. Wang, Zheng Gao
  • Patent number: 10199160
    Abstract: Methods and apparatus for flux cancellation includes first and second inductors. A system cam include first and second inductors and a layer of magnetic material disposed between the first inductor and the second inductor. In embodiments, when the inductors are driven with a respective oscillating current, at least a portion of magnetic flux generated by the first inductor is substantially canceled by at least a portion of magnetic flux generated by the second inductor in the layer of magnetic material.
    Type: Grant
    Filed: March 22, 2018
    Date of Patent: February 5, 2019
    Assignee: WiTricity Corporation
    Inventor: Guillaume Lestoquoy
  • Patent number: 10090098
    Abstract: An arrangement for reducing a magnetic unidirectional flux component in the core of a transformer includes a measurement apparatus which provides a measurement signal corresponding to the magnetic unidirectional flux component, a compensation winding magnetically coupled to the core of the transformer, wherein magnetic flux flowing in the core induces a voltage in the compensation winding, a switch device arranged electrically in series together with the compensation winding in a current path, a control device which controls the switch device via a control parameter, where the switch unit comprises a magnetic core and a winding arrangement which is magnetically coupled to the magnetic core, and the control parameter is supplied to the winding arrangement such that the magnetic saturation state of the core is variable, whereby the conductive state of the switch unit can be produced.
    Type: Grant
    Filed: September 29, 2015
    Date of Patent: October 2, 2018
    Assignee: Siemens Aktiengesellschaft
    Inventor: Peter Hamberger
  • Patent number: 9917543
    Abstract: An inverter includes a plurality of inverter legs that each includes first, second, and third switches. A first control line connected to the first switch receives a first control signal. A second control line connected to the second switch receives a second control signal. A third control line connected to the third switch receives the first control signal. The first, second, and third switches are connected sequentially in series. A first connector line is connected between the first switch and the second switch and to a first winding of an electric machine. A second connector line is connected between the second switch and the third switch and to a second winding of the electric machine. The second control signal is complementary to the first control signal.
    Type: Grant
    Filed: October 19, 2016
    Date of Patent: March 13, 2018
    Assignee: Wisconsin Alumni Research Foundation
    Inventors: Bulent Sarlioglu, Di Han
  • Patent number: 9846181
    Abstract: A current sensor arrangement for measuring an effective primary current in a primary conductor having a magnetic core for magnetic coupling of the primary conductor to a secondary conductor and a controlled voltage source connected to the secondary conductor and configured to apply a voltage with adjustable polarity to the secondary conductor so that a secondary current passes through the secondary conductor. A measurement and control unit is coupled to the secondary conductor and configured to generate a measuring signal that represents the secondary current, to continuously detect the occurrence of magnetic saturation in the core, and to reverse the polarity of the voltage upon the detection thereof in order to reverse magnetization of the core. Furthermore, the measurement and control unit is configured to evaluate a spectrum of the measuring signal and determine a frequency of a current passing through the primary conductor based on the spectrum.
    Type: Grant
    Filed: July 29, 2015
    Date of Patent: December 19, 2017
    Assignee: VACUUMSCHMELZE GMBH & CO. KG
    Inventors: Steffen Boettcher, Holger Schwenk
  • Patent number: 9762055
    Abstract: The invention relates to an electric energy storage system, comprising an inverter (6), several associations (21, 22), of an electric energy storage unit (1, 2) in series with a bidirectional chopper (3, 4), connected in parallel to a same input of the inverter (6), on the side of their chopper (3, 4), characterized in that at least one bidirectional chopper (3, 4), associated with an electric energy storage unit (1, 2) that can be charged and discharged asymmetrically, is sized asymmetrically for the charge and discharge of said associated storage unit (1, 2).
    Type: Grant
    Filed: April 26, 2013
    Date of Patent: September 12, 2017
    Assignee: SAFT
    Inventors: Younes Jaoui, Christophe Morin
  • Patent number: 9721718
    Abstract: A transformer includes multiple differential ports and first and second transformer windings. The first transformer winding includes a first transformer half-winding coupled to a first differential port of the differential ports. The first transformer winding also includes a second transformer half-winding coupled to a second differential port of the differential ports. An amplifier system that has a transformer is also provided. The amplifier system includes a first and a second stage amplifier. The first stage amplifier includes a first and a second amplifier. The second stage amplifier includes a third and a fourth amplifier. The transformer is coupled between the first stage amplifier and the second stage amplifier, where the transformer has a primary loop and a secondary loop. The primary loop of the transformer may be configured to receive differential signals of the first amplifier. A method for fabricating a transformer is also provided.
    Type: Grant
    Filed: April 29, 2015
    Date of Patent: August 1, 2017
    Assignee: AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD.
    Inventors: Sayedfarid Shirinfar, Ehsan Adabi Firouzjaei, Tirdad Sowlati, Ahmadreza Rofougaran
  • Patent number: 9602955
    Abstract: Systems and methods for concurrent wireless power transfer and data transmission are provided. A constraint encoder receives data bits for communication to a mobile device and encodes the data bits onto a transmit signal. The constraint encoder specifies signal constraints that cause the transmit signal to have a peak-to-power-average ratio (PAPR) during a given time interval sufficient to provide wireless power transfer to the mobile device. The system also includes a signal generator coupled to the constraint encoder. The signal generator generates the transmit signal according to the signal constraints. The system further includes a transmitter coil that is coupled to the signal generator. The transmitter coil is configured to transmit the transmit signal that has been encoded with the data bits to receiver coils of the mobile device. The encoded transmit signal is able to provide wireless power transfer and the encoded data bits to the mobile device.
    Type: Grant
    Filed: May 20, 2015
    Date of Patent: March 21, 2017
    Assignee: EMPIRE TECHNOLOGY DEVELOPMENT LLC
    Inventors: Harm Cronie, Xudong Ma
  • Patent number: 9602167
    Abstract: A remote energy transfer system is provided that is capable of wirelessly transmitting data and power through barriers. Generally, the remote energy transfer system comprises at least one power antenna, at least one data antenna, and at least one link controller operatively coupled to the power antenna and the data antenna. The link controller can be configured to at least partially control the energy transfer from the power antenna and the data transfer of the data antenna.
    Type: Grant
    Filed: March 28, 2013
    Date of Patent: March 21, 2017
    Assignee: TRIUNE SYSTEMS, LLC
    Inventors: Ross E. Teggatz, Jonathan Knight, Ken Moore, Emanuel Stingu
  • Patent number: 9330289
    Abstract: Disclosed is a communication apparatus comprising: a communication section which performs communication in an ASK modulation format with an RFID tag; and a control section which sets a modulation degree of the ASK modulation of the communication section to a large degree when polling of the RFID tag is performed by the communication section and which sets the modulation degree to a small degree when response information is received from the RFID tag through the communication section.
    Type: Grant
    Filed: February 27, 2012
    Date of Patent: May 3, 2016
    Assignee: CASIO COMPUTER CO., LTD.
    Inventors: Masaki Fujimoto, Keiichi Tanioka
  • Patent number: 9283858
    Abstract: A magnetic flux pad for generating or receiving magnetic flux has two pole areas (11, 12), a permeable core (14) and a coil (16) wound about the core. The pad allows useable flux to be generated at a significant height above a surface of the pad.
    Type: Grant
    Filed: February 5, 2010
    Date of Patent: March 15, 2016
    Assignee: Auckland Uniservices LTD
    Inventors: John Talbot Boys, Chang-Yu Huang
  • Patent number: 9041383
    Abstract: A method for linearizing voltage transmission through a transformer including a magnetic core and, input and output windings. A measurement signal is supplied to the input winding at a first frequency and an output signal is measured at the output winding of the transformer, wherein the voltage of the measurement signal may be so low that the transformer operates in a non-linear region. The method includes, for a conditioning signal, selecting a second frequency different from the first frequency, defining an amplitude value of the conditioning signal and supplying the conditioning signal to the input winding at the second frequency with the defined amplitude value so that the transformer operates in its linear region.
    Type: Grant
    Filed: September 18, 2013
    Date of Patent: May 26, 2015
    Assignee: ABB Research Ltd.
    Inventors: Tord Bengtsson, Henrik Johansson, Stefan Roxenborg, Joseph Menezes, Zoltan Nagy, Mikael Sehlstedt
  • Patent number: 8791687
    Abstract: An apparatus and technique that reduces induced cross-talk current between transformer windings. The apparatus includes a transformer having a first secondary winding that provides a first voltage relative to earth ground, a second secondary winding that provides a second voltage relative to floating ground, and a shield disposed between the first and second secondary windings. A correction circuit connected to the first secondary winding is configured to generate a correction voltage. The correction voltage drives a shield to induce a correction current into the second secondary winding to reduce cross-talk current induced between the first and second secondary windings.
    Type: Grant
    Filed: May 24, 2012
    Date of Patent: July 29, 2014
    Assignee: Agilent Technologies, Inc.
    Inventor: Joe E. Marriott
  • Patent number: 8669745
    Abstract: In accordance with the invention there is also provided a voltage combiner comprising: a transformer having a first and second winding each having a first and second tap; and an inductor connected between the first and second taps of the second winding, wherein: the first tap of the first winding is adapted for connection to a first voltage, the first tap of the second winding is adapted for connection to a second voltage, and the second tap of the second winding is adapted to provide an output being the first and second voltages combined, and further wherein: the inductor is adapted to provide a bypass path for the current associated with the second voltage.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: March 11, 2014
    Assignee: Nujira Limited
    Inventor: Gerard Wimpenny
  • Publication number: 20140015510
    Abstract: A method for linearizing voltage transmission through a transformer including a magnetic core and, input and output windings. A measurement signal is supplied to the input winding at a first frequency and an output signal is measured at the output winding of the transformer, wherein the voltage of the measurement signal may be so low that the transformer operates in a non-linear region. The method includes, for a conditioning signal, selecting a second frequency different from the first frequency, defining an amplitude value of the conditioning signal and supplying the conditioning signal to the input winding at the second frequency with the defined amplitude value so that the transformer operates in its linear region.
    Type: Application
    Filed: September 18, 2013
    Publication date: January 16, 2014
    Inventors: Tord Bengtsson, Henrik Johansson, Stefan Roxenborg, Joseph Menezes, Zoltan Nagy, Mikael Sehlstedt
  • Patent number: 8314674
    Abstract: An electrical transformer with unidirectional flux compensation is provided. The transformer includes a soft magnetic core on which a primary winding arrangement, a secondary winding arrangement, and a compensation winding arrangement are arranged. The compensation winding arrangement is connected to a current control device which feeds a compensation current into the compensation winding arrangement using a control signal. A magnetic field measuring device measures the magnetic field in the core of the transformer or the stray magnetic field that closes outside the core via an air path and provides the control signal.
    Type: Grant
    Filed: June 12, 2007
    Date of Patent: November 20, 2012
    Assignee: Siemens AG Österreich
    Inventors: Peter Hamberger, Albert Leikermoser
  • Patent number: 8258772
    Abstract: The present invention is a DC-DC converter characterized by including a switch element that is provided between one end of a DC power source and one end of a load and turns ON and OFF current input from the DC power source, an inductance element that is provided between one end of the switch element on a load-side end and includes a doughnut-shaped magnetic core and a conductive wire wound around the magnetic core, a commutation switch provided between a node between the switch element and the inductance element and a ground potential, and a capacitance element provided between a node between the inductance element and the load and the ground potential, wherein a magnetic flux density of the magnetic core varies partially.
    Type: Grant
    Filed: February 23, 2011
    Date of Patent: September 4, 2012
    Assignee: Fujitsu Limited
    Inventors: Yu Yonezawa, Naoyuki Mishima
  • Patent number: 8237426
    Abstract: The present invention discloses a flux linkage compensator, which applies to an UPS system and comprises a load transformer flux linkage observer, a compensation voltage command generator, and a flux linkage command generator. The load transformer flux linkage observer generates a load transformer flux linkage signal. The flux linkage command generator generates a flux linkage command signal. The difference between the load transformer flux linkage signal and the flux linkage command signal forms a flux linkage deviation signal. The compensation voltage command generator generates a voltage compensation signal to make the flux linkage deviation signal approach zero. Thereby, the flux linkage compensator can compensate for the flux linkage deviation occurring in starting the UPS system. Thus, the present invention can perform voltage compensation fast and reliably and inhibit the inrush current effectively.
    Type: Grant
    Filed: October 1, 2009
    Date of Patent: August 7, 2012
    Assignee: National Tsing Hua University
    Inventors: Yu-Hsing Chen, Po-Tai Cheng
  • Patent number: 8183938
    Abstract: A method is provided for controlling a resonant circuit (1) of an ICPT system. The resonant circuit has a controlled variable reactance (2), and a predetermined perturbation is introduced in the magnitude of variable reactance. The change in a property of the resonant circuit in response to the perturbation is sensed, and the variable reactance is varied to alter the resonant frequency of the circuit in response to the sensed change.
    Type: Grant
    Filed: April 28, 2006
    Date of Patent: May 22, 2012
    Assignee: Auckland Uniservices Limited
    Inventors: John Talbot Boys, Grant Anthony Covic
  • Publication number: 20120049835
    Abstract: A saturation control unit for an interphase transforming unit is provided. The interphase transforming unit has a primary coil and a secondary coil which are magnetically coupled via a magnetic core member. The saturation control unit includes a minimum detecting unit and a maximum detecting unit. The minimum detecting unit detects a minimum value of a magnetizing current of the interphase transforming. The maximum detecting unit detects a maximum value of the magnetizing current. A saturation estimating unit is provided for estimating an offset value of the magnetizing current. A saturation control signal generating unit is provided for generating a saturation control signal for the interphase transforming unit based on the detected minimum value, the detected maximum value, and the estimated offset value.
    Type: Application
    Filed: September 25, 2009
    Publication date: March 1, 2012
    Inventors: Rodney Jones, Jan Sundvall
  • Patent number: 7982442
    Abstract: A method for voltage stabilization of an electrical power network system including a producing power network system side, a consuming power network side including a power load, a power transmission line with an impedance ZLN, a transformer and an on-line tap changer added to the transformer. The impedance of the line is measured in case of dynamic instabilities. A transformer ratio n is controlled by changing a voltage reference Vref of the on-line tap changer. The voltage reference is changed according to a feed forward compensation from the impedance of the line.
    Type: Grant
    Filed: February 11, 2005
    Date of Patent: July 19, 2011
    Assignee: ABB Technology Ltd.
    Inventors: Stefan Solyom, Bo Lincoln, Anders Rantzer
  • Publication number: 20110080157
    Abstract: The present invention discloses a flux linkage compensator, which applies to an UPS system and comprises a load transformer flux linkage observer, a compensation voltage command generator, and a flux linkage command generator. The load transformer flux linkage observer generates a load transformer flux linkage signal. The flux linkage command generator generates a flux linkage command signal. The difference between the load transformer flux linkage signal and the flux linkage command signal forms a flux linkage deviation signal. The compensation voltage command generator generates a voltage compensation signal to make the flux linkage deviation signal approach zero. Thereby, the flux linkage compensator can compensate for the flux linkage deviation occurring in starting the UPS system. Thus, the present invention can perform voltage compensation fast and reliably and inhibit the inrush current effectively.
    Type: Application
    Filed: October 1, 2009
    Publication date: April 7, 2011
    Inventors: Yu-Hsing CHEN, Po-Tai Cheng
  • Publication number: 20100194373
    Abstract: transformer includes a soft magnetic core on which a primary winding arrangement, a secondary winding arrangement, and a compensation winding arrangement are arranged. The compensation winding arrangement is connected to a current control device which feeds a compensation current into the compensation winding arrangement using a control signal. A magnetic field measuring device measures the magnetic field in the core of the transformer or the stray magnetic field that closes outside the core via an air path and provides the control signal.
    Type: Application
    Filed: June 12, 2007
    Publication date: August 5, 2010
    Applicant: SIEMENS TRANSFORMERS AUSTRIA GMBH & CO KG
    Inventors: Peter Hamberger, Albert Leikermoser
  • Patent number: 7755299
    Abstract: The invention relates to a transformer (10) for balancing the current in an AC circuit, comprising a primary winding (12), a secondary winding (14) and a main inductance (16). The transformer is characterized in that a capacitive component is connected in parallel to the primary winding (12) or to the secondary winding (14), whose capacitance value is determined such that the reactive current IL brought about by the main inductance (16) is substantially compensated. A transformer of this kind can preferably be employed in current balancing circuits as used, for example, in systems for backlighting LCD displays.
    Type: Grant
    Filed: August 15, 2007
    Date of Patent: July 13, 2010
    Assignee: Minebea Co., Ltd.
    Inventor: Robert Weger
  • Publication number: 20100123451
    Abstract: An inductive power transfer system includes a base unit comprising a first inductive element for providing input power to a second inductive element of a target unit providing output power, a positioning structure provided on at least one of the base unit and the target unit for removably positioning the second inductive element at a predetermined orientation and distance relative to the first inductive element, a switch element configured for selectively applying a time varying electric current to the first inductive element to produce a time varying magnetic field for inducing an electric current in the second inductive element, and a control circuit for monitoring one parameter indicative of an efficiency of power transfer and automatically selectively adjusting at least one characteristic of the time varying electric current responsive to the parameter to maximize an efficiency of power transfer from the base unit to the target unit.
    Type: Application
    Filed: November 14, 2008
    Publication date: May 20, 2010
    Applicant: Harris Corporation
    Inventor: Benjamin Freer
  • Patent number: 7675764
    Abstract: A power converter having input and output nodes and a method of operating the same. In one embodiment, the power converter includes a switching circuit including first, second and third active phase legs. Each of the first, second and third active legs includes a first switch coupled to one of the input nodes and a second switch coupled to another of the input nodes and has a common switching node therebetween. The power converter further includes a magnetic device including first, second and third primary windings, and first, second and third secondary windings. The first, second and third primary windings are coupled to the common switching node of the first, second and third active phase legs, respectively. The power converter still further includes a rectifier including first, second and third rectifier elements interposed between the first, second and third secondary windings, respectively, and one of the output nodes.
    Type: Grant
    Filed: August 25, 2008
    Date of Patent: March 9, 2010
    Assignee: Flextronics International USA, Inc.
    Inventors: Sriram Chandrasekaran, Vivek Mehrotra
  • Patent number: 7573363
    Abstract: A communication transformer for power line communication includes a magnetic core, a plurality of transfer-purpose windings wound on the magnetic core, and an additional winding. The additional winding is wound on the magnetic core in such a manner that the additional winding is positioned between the plurality of transfer-purpose windings, and does not contribute in signal transfer operations. The communication transformer is arranged such that a half way portion of the additional winding along a length direction thereof is electrically connected to a constant potential.
    Type: Grant
    Filed: November 12, 2004
    Date of Patent: August 11, 2009
    Assignee: Panasonic Corporation
    Inventor: Akihiro Yamashita
  • Patent number: 7573253
    Abstract: A system for managing electrical consumption includes a connecting means for connection to an incoming power supply of a facility, for connection in parallel, including a hot line and a neutral line, and at least one ground. The following components are connected between the hot line and the neutral line. They are connected in the order of at least one front capacitor of predetermined capacitance, at least one front arc suppressor, at least one front metal oxide varistor line transient voltage surge suppressor having a predetermined number of joules capability to suppress undesired power spikes, at least two inductor/metal oxide varistor iterative transformers, at least a second capacitor of its own predetermined capacitance, at least one metal oxide varistor having a predetermined number of joules capability and at least two capacitors, each having its own predetermined capacitance different form one another.
    Type: Grant
    Filed: July 19, 2006
    Date of Patent: August 11, 2009
    Assignee: DMI Manufacturing Inc.
    Inventor: Guy J. Lestician
  • Publication number: 20090184703
    Abstract: An compensated voltage transformer includes a voltage transformer. The voltage transformer includes a primary winding that receives a supply voltage, a meter winding that generates a first voltage based on a first turns ratio between the primary winding and the meter winding, and a power winding that generates a second voltage based on a second turns ratio of the primary winding to the power winding. A current transformer includes a primary winding and a secondary winding. The primary winding carries a load current that flows through the power winding and the secondary winding connects to the meter winding.
    Type: Application
    Filed: January 17, 2008
    Publication date: July 23, 2009
    Inventor: Glenn Warren Larson
  • Patent number: 7550951
    Abstract: A two-step charger includes an AC/DC power supply, a transformer, a compensator, a controller, a comparator and an isolating controller. The comparator detects whether a battery is connected to the transformer. If so, a command voltage of the charger is set at a high level. Since the battery voltage is lower than the command voltage, the controller orders the compensator to send out a compensating current. The current entering the primary side of the transformer is increased to promote the output current from the secondary side of the transformer. Once the comparator detects that the battery reaches as high as the charger, the command voltage is adjusted to a low level. The controller orders the compensator to stop outputting the compensating current. Therefore, a larger current can speed up battery charging. Once the battery is fully charged, the charging voltage is lowered to avoid high temperature.
    Type: Grant
    Filed: October 3, 2006
    Date of Patent: June 23, 2009
    Assignee: Asian Power Devices Inc.
    Inventors: Yu-Chi Lai, Ji-Shun Liao
  • Patent number: 7525297
    Abstract: An impedance-compensated current transformer comprising a primary winding, a power source electrically coupled through the primary winding; a secondary winding magnetically coupled to the first primary winding, the secondary winding having a secondary winding impedance and a secondary winding resistance; and an impedance-compensation circuit electrically coupled across the secondary winding; wherein the impedance-compensation circuit actively reflects to the secondary winding a virtual impedance which is equal in magnitude and opposite in polarity to the secondary winding impedance.
    Type: Grant
    Filed: December 1, 2005
    Date of Patent: April 28, 2009
    Assignee: FALCO Ltd.
    Inventor: Umberto Gibellini
  • Patent number: 7436164
    Abstract: An untethered device is configured to inductively couple to a source device, which generates a varying magnetic field having a fixed frequency. The untethered device includes a tunable resonant circuit having a resonance frequency and configured to generate a supply voltage for the untethered device in response to the varying magnetic field. The untethered device further includes a frequency control circuit coupled to the tunable resonant circuit and configured to produce a control signal using signals developed within the tunable resonant circuit. The control signal is useable to adjust the resonance frequency of the tunable resonant circuit to the fixed frequency of the source device.
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: October 14, 2008
    Assignee: 3M Innovative Properties Company
    Inventor: Martin J. Vos
  • Patent number: 7417875
    Abstract: A power converter having input and output nodes and a method of operating the same. In one embodiment, the power converter includes a switching circuit including first, second and third active phase legs. Each of the first, second and third active legs includes a first switch coupled to one of the input nodes and a second switch coupled to another of the input nodes and has a common switching node therebetween. The power converter further includes a magnetic device including first, second and third primary windings, and first, second and third secondary windings. The first, second and third primary windings are coupled to the common switching node of the first, second and third active phase legs, respectively. The power converter still further includes a rectifier including first, second and third rectifier elements interposed between the first, second and third secondary windings, respectively, and one of the output nodes.
    Type: Grant
    Filed: February 8, 2006
    Date of Patent: August 26, 2008
    Assignee: ColdWatt, Inc.
    Inventors: Sriram Chandrasekaran, Vivek Mehrotra
  • Publication number: 20080186009
    Abstract: The present invention relates a system for compensating for a voltage dip and undervoltage containing a primary side and secondary side transformer, a voltage dip/swell detector, and a level detector/switch selector device, wherein the secondary side of the transformer possesses a minimally sufficient number of taps to allow the system to be modified to meet supply voltage dips. The system, in particular, allows for long term compensation of voltage dips and quick adjustment of load voltage, usually within one cycle. Methods of using the present invention are also presented.
    Type: Application
    Filed: February 2, 2007
    Publication date: August 7, 2008
    Applicant: The Hong Kong Polytechnic University
    Inventors: Kai Ming Tsang, Wai Lok Chan
  • Publication number: 20080157748
    Abstract: An apparatus for controlling the power flow in a high voltage network. A phase shifting transformer includes a tap changer.
    Type: Application
    Filed: August 27, 2004
    Publication date: July 3, 2008
    Applicant: ABB RESEARCH LTD.
    Inventors: Bertil Berggren, Mojtaba Noroozian
  • Publication number: 20080062589
    Abstract: The present the invention provides power supplies and circuitry for powering high-voltage devices.
    Type: Application
    Filed: February 1, 2007
    Publication date: March 13, 2008
    Applicant: Artificial Muscle, Inc.
    Inventor: Richard B. DRABING
  • Patent number: 7180282
    Abstract: Methods and apparatus for supplying power for use in metering electrical energy over a wide range of voltages with a single meter are disclosed. The wide ranging meter includes a processing unit for processing divided input voltage and a current component in order to determine electrical energy metering values. The processing unit is operable in response to supply voltages. A power supply, connected to receive the undivided voltage component, generates the supply voltages over the wide dynamic range. It is especially preferred for the power supply to include a transformer having first, second and third windings, wherein the undivided voltage component is provided to the first winding and wherein the second winding defines the output of the power supply. A switching member is connected to the first winding for permitting and preventing the flow of current in response to a control signal. A control member generates the control signal in response to the output of the power supply.
    Type: Grant
    Filed: July 11, 2003
    Date of Patent: February 20, 2007
    Assignee: Elster Electricity, LLC
    Inventor: Fred F. Schleifer
  • Patent number: 7122999
    Abstract: Circuits for shortening a rise time of a load include a main pulse transformer coupled to a load, an auxiliary pulse transformer coupled to the load, and a diode connected between the auxiliary pulse transformer and the main pulse transformer. The main pulse transformer delivers a main pulse to the load. The auxiliary pulse transformer delivers an auxiliary pulse to charge the capacitance associated with the load. The diode isolates the auxiliary pulse transformer from the main pulse. By charging the capacitance in this manner, a rise time of the main pulse is shortened and ringing of the main pulse on the load is reduced.
    Type: Grant
    Filed: February 23, 2004
    Date of Patent: October 17, 2006
    Assignee: Stangenes Industries, Inc.
    Inventor: Roger Hitchcock
  • Patent number: 7002333
    Abstract: Process and device for compensating the low frequency magnetic field in an inductive signal coupling unit. According to the invention the coupling unit comprises a ferromagnetic core (30) which encloses a conductor through which a low frequency current (1) is circulating in order to inject thereon a high frequency signal. Current (1), circulating through the conductor or the magnetic field (3) produced in the coupling unit, is detected, and a compensating current is obtained based on the value obtained in the detection carried out, and the compensating current obtained in the coupling unit is injected through a low pass filter (9) to produce a magnetic field (4) equal and opposite to the produced by current (1) of the conductor in the coupling unit, and thereby avoiding the saturation of the magnetic core (30) without adding insertion loss.
    Type: Grant
    Filed: December 13, 2004
    Date of Patent: February 21, 2006
    Assignee: DiSeno De Sistemas En Silico, S.A.
    Inventors: Jorge Vicente Blasco Claret, Antonio Poveda Lerma
  • Patent number: 6727791
    Abstract: A capacitive voltage transformers for distribution of the power from 10 kv high potential line, includes a insulating column with a high potential terminal, a ground terminal and capacitors C1 and C2 in series connection. The column is filled with oilless dry filler. The capacitors C1 and C2 formed by a plurality of separated metallized film capacitors respectively in series or in parallel connection. At the tapping point between the capacitors there is a leading-out terminal of the secondary voltage which is connected to an induction transformer L in parallel. The transformer includes a frame with “C” shaped iron cores and windings wound around the cores. There is an over-voltage protector P connected in parallel between the tapping point and ground. A capacitive voltage divider is integrally combined with the transformer to provide a small volume, low cost device with a savings in materials.
    Type: Grant
    Filed: December 4, 2002
    Date of Patent: April 27, 2004
    Inventors: Youdong Zhou, Decai Wang
  • Patent number: 6713999
    Abstract: A current sensor (1) is provided with low-pass filters (17 and 18) for stabilizing the pulse-duration modulated compensation signal. The current sensor is also provided with an additional RC element (40). Furthermore, a limiting means consisting of Zener diodes (44) and an ohmic resistance (45) is provided for suppressing fast current transients.
    Type: Grant
    Filed: February 15, 2002
    Date of Patent: March 30, 2004
    Assignees: Vacuumschmelze GmbH, Semikron Elektronik GmbH
    Inventors: Friedrich Lenhard, Stefan Schäfer, Paul Mourick
  • Patent number: 6661072
    Abstract: A piezoelectric ceramic transistor is formed from a single-layered or multi-stacked layers piezoelectric ceramic voltage transformer and a capacitor, the capacitor being series connected to an input terminal of the piezoelectric ceramic voltage transformer to prevent electric power and prevent loss due to feedback, thereby compensating and increasing vibrations of the piezoelectric ceramic voltage transformer. Alternatively, the above connection scheme is achieved by either serial connecting a capacitor between a power output of the transformer and a load terminal, or parallel connecting a first capacitor to a power input of the transformer while a second capacitor is series connected between a power output of the transformer and the load terminal to obtain an increased power and thereby increasing the load current.
    Type: Grant
    Filed: June 3, 2002
    Date of Patent: December 9, 2003
    Assignee: Shin Jiuh Corp.
    Inventor: Eddie Cheng
  • Patent number: 6577111
    Abstract: Differential measurement of a transformer magnetizing current and a delta-modulation technique is used to provide compensation for dc saturation of the transformer core, with faster response times, low losses, and with immunity to dc drift in the measuring electronics. During the half-cycle in which the output voltage transitions from its positive maximum to its negative maximum, the positive peak value of the magnetizing current is determined, and during the half-cycle in which the output voltage transitions from its negative maximum to its positive maximum, the negative peak value of the magnetizing current is determined. The positive peak magnetizing current value is compared to the similar value from the previous cycle, and the onset of core saturation in the positive direction is then determined. The negative peak magnetizing current value is compared to the similar value from the previous cycle, and the onset of core saturation in the negative direction is then determined.
    Type: Grant
    Filed: September 6, 2001
    Date of Patent: June 10, 2003
    Assignee: ABB Technology AG
    Inventors: David L. Dickmander, Aaron M. Jungreis, Jeffery Parker
  • Patent number: 6545453
    Abstract: Voltage regulation of power transformers by the use of a separate, removable, detachably coupled device external to the main transformer that can be attached to a main transformer unit when voltage regulation is desired. The device is connected to the three neutrals of the main transformer and can comprise: (a) a bank of three capacitors connected in wye, (b) a bank of three medium voltage (MV) or low voltage (XV) transformers, (c) one three-phase low voltage or medium voltage transformer, or (d) a combination of a XV/MV transformer and a capacitor bank.
    Type: Grant
    Filed: April 3, 2001
    Date of Patent: April 8, 2003
    Assignee: ABB Inc.
    Inventors: Mietek T. Glinkowski, Mark Perkins
  • Publication number: 20030006748
    Abstract: Voltage regulation of power transformers by the use of a separate, removable, detachably coupled device external to the main transformer that can be attached to a main transformer unit when voltage regulation is desired. The device is connected to the three neutrals of the main transformer and can comprise: (a) a bank of three capacitors connected in wye, (b) a bank of three medium voltage (MV) or low voltage (XV) transformers, (c) one three-phase low voltage or medium voltage transformer, or (d) a combination of a XV/MV transformer and a capacitor bank.
    Type: Application
    Filed: April 3, 2001
    Publication date: January 9, 2003
    Inventors: Mietek T. Glinkowski, Mark Perkins
  • Patent number: 6469486
    Abstract: A transformer group in which a multitude of transformers are used to supply energy to a single load. The transformers are connected in series; in order to assist in providing a “flux equalizing” affect, the invention includes a flux equalizer circuit. The flux equalizer circuit provides a series of flux windings. Each flux winding is associated with a single transformer. The windings are arranged in parallel. In this manner, a balancing of the output of the transformers is obtained; the power output from each transformer is “sensed” by its associated flux winding which is “shared” with the other transformers via their own associated flux winding. Power is process then through the secondary windings, rectifiers, and output filters to a common load.
    Type: Grant
    Filed: April 3, 2000
    Date of Patent: October 22, 2002
    Assignee: Ascom Energy Systems AG
    Inventor: Ionel Jitaru
  • Patent number: 6384588
    Abstract: A method for magnetically inducing voltages in the secondary windings of a transformer without saturating its core. The method includes (a) applying to a first primary driven winding a first set of voltages, thereby generating (i) a first current in the first primary driven winding, (ii) a first magnetic field having a first quantum of energy, and (iii) a magnetically induced second set of voltages in the first secondary winding; (b) interrupting the first current, thereby causing the first magnetic field to collapse, and (c) not later than interrupting the first current, clamping the first primary driven winding to a third set of voltages, thereby magnetically inducing a fourth set of voltages in the first secondary winding. At least one of the fourth set of voltages is less than at least one of the second set of voltages.
    Type: Grant
    Filed: April 13, 2000
    Date of Patent: May 7, 2002
    Inventor: Daniel F. Mulhauser
  • Patent number: 6326772
    Abstract: A power supply apparatus 200 comprises an energy supplying circuit 210 for supplying energy at a predetermined timing, and an energy preserving circuit 220 for receiving the energy supplied from the energy supplying circuit 210 and preserving the energy. The energy preserving circuit 220 includes an inductor 221, a capacitance 223 connected to one end of the inductor 221 at a node 222, and a capacitance 225 connected to the other end of the inductor 221 at a node 224. Energy is supplied to a load via at least one of the node 222 and the node 224.
    Type: Grant
    Filed: December 12, 2000
    Date of Patent: December 4, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Keiichi Kusumoto, Akira Matsuzawa
  • Publication number: 20010006342
    Abstract: A power supply apparatus 200 comprises an energy supplying circuit 210 for supplying energy at a predetermined timing, and an energy preserving circuit 220 for receiving the energy supplied from the energy supplying circuit 210 and preserving the energy. The energy preserving circuit 220 includes an inductor 221, a capacitance 223 connected to one end of the inductor 221 at a node 222, and a capacitance 225 connected to the other end of the inductor 221 at a node 224. Energy is supplied to a load via at least one of the node 222 and the node 224.
    Type: Application
    Filed: December 12, 2000
    Publication date: July 5, 2001
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Keiichi Kusumoto, Akira Matsuzawa