With Power Supply System Patents (Class 219/660)
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Publication number: 20120024842Abstract: A circuit arrangement for an induction cooking device and an induction cooking device with a circuit of this kind, wherein the circuit includes a resonant circuit with at least one induction coil for the inductive heating of an induction cooking dish and at least one capacitor, as well as a variable circuit element for the variation of the inductivity and/or the capacity of the resonant circuit. The variable circuit element in preference is a choke controllable with direct current and the switching circuit in preference is operated with a constant frequency.Type: ApplicationFiled: April 28, 2011Publication date: February 2, 2012Applicant: INDUCS AGInventors: Albert Thomann, Christian Fuchs, Martin Behle
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Publication number: 20110315677Abstract: A device for heating an object by an electromagnetic induction comprises at least one rotor, and the rotor comprises at least one permanent magnet. The device also comprises a stator for providing varying magnetic field arranged to interact with at least one magnet of the rotor and causing said rotor to rotate around the axis. The magnets of said rotor is arranged to provide varying magnetic field and eddy currents within the object when said rotor is rotated so that said object is heated by the electromagnetic induction generated by said varying magnetic field and eddy currents.Type: ApplicationFiled: February 26, 2010Publication date: December 29, 2011Applicant: EFFMAG OYInventor: Pekka Suominen
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Publication number: 20110303655Abstract: A welding equipment for metallic materials capable of performing heat treatment such as tempering based on partial heating in spot welding is provided. The welding equipment 1 sandwiches metallic materials 9 with a pair of electrodes 4, 4, and heats different regions of the metallic materials 9 by energization, with the pair of electrodes 4, 4 maintained at the same position with respect to the metallic materials 9. The welding equipment includes a first heating means 6 connected to the pair of electrodes 4, 4 for heating and welding the internal region of the circle defined by projecting the cross-sectional area of the axis of the electrodes on the metallic materials by applying power having a low first frequency, a second heating means 8 for heating a ring-shaped region along the circle by applying power having a second frequency that is higher than the first frequency, and an energization control unit 10 for independently controlling the first and the second heating means 6, 8.Type: ApplicationFiled: September 30, 2009Publication date: December 15, 2011Applicants: NATIONAL INSTITUTE FOR MATERIALS SCIENCE, NETUREN CO., LTD.Inventors: Takahiko Kanai, Munehisa Hatta, Fumiaki Ikuta, Kazuhiro Kawasaki, Eizaburo Nakanishi, Tsuyoshi Yoshida, Kotobu Nagai, Masao Hayakawa, Takehiko Itagaki
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Publication number: 20110297668Abstract: An inductive heater humidifier for heating fluids is provided by the present disclosure. The humidifier includes a reservoir having a ferromagnetic bottom plate. The reservoir is disposed on top of a non-metallic cover plate, which rests on a topless ferrite base. The ferrite base includes induction coil for generating heat. The induction coil is energized to produce eddy currents that generate heat, which is convectively transferred to the reservoir via the bottom plate to heat fluid in the reservoir.Type: ApplicationFiled: June 4, 2010Publication date: December 8, 2011Applicant: Watlow Electric Manufacturing CompanyInventor: Cal Swanson
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Publication number: 20110284527Abstract: An auxiliary welding heating system includes an induction heating coil disposed adjacent to a welding torch or plasma cutter. The auxiliary welding heating system further includes an induction power supply configured to generate an alternating current and a step-down transformer coupled to the induction power supply. The induction heating coil is coupled to the step-down transformer and is configured to receive the alternating current and induce eddy currents in a welding work piece to heat the welding work piece before an advancing welding arc or plasma cut to a homologous temperature of at least approximately 0.5.Type: ApplicationFiled: May 19, 2011Publication date: November 24, 2011Applicant: Illinois Tool Works Inc.Inventors: Todd Earl Holverson, Jerald Edward Jones, Valerie Lisa Rhoades, Stephen King Madden
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Publication number: 20110274449Abstract: A heating control device which is capable of detecting an abnormality of an object to be heated accurately. A power-supply unit applies the electric power to the electromagnetic induction heating coil. A magnetic flux detecting unit detects a magnetic flux emitted from the electromagnetic induction heating coil across the object, and outputs a voltage corresponding to the detected magnetic flux. A changing unit changes at least one of the detected magnetic flux voltage value and an abnormality detection threshold value based on relationship between an electric power set value that defines the electric power and an input voltage inputted to the power-supply unit. A determination unit compares the detected magnetic flux voltage value changed by the changing unit to the abnormality detection threshold value, and determines an abnormality of the object when the detected magnetic flux voltage value is larger than the abnormality detection threshold value.Type: ApplicationFiled: May 4, 2011Publication date: November 10, 2011Applicant: CANON KABUSHIKI KAISHAInventor: Ryuta MINE
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Publication number: 20110259880Abstract: A mechanical scraper with synchronized pulse electrothermal deicing includes a heating element that is coupled to a power supply and that is operable to convert power from the power supply into heating energy. A controller controls the magnitude and duration in which power is applied to the heating element, such that only an interfacial layer of ice at an ice-object interface is disrupted for a sufficient period of time to allow the scraper to move or remove the dislodged ice/snow. A scraper then works over the surface to be deiced, thus removing the ice before the interfacial layer re-freezes. Another method of the present invention electromagnetically induces current at the ice-to-object interface, to melt interfacial ice, using coils and a high frequency power supply disposed proximal to the scraper.Type: ApplicationFiled: December 7, 2010Publication date: October 27, 2011Applicant: ICECODE, LLCInventors: Victor F. Petrenko, Charles Sullivan
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Publication number: 20110253706Abstract: A heating device includes a first induction coil, a second induction coil, a first phase power unit, a second phase power unit, a power controller and a user interface unit. The second induction coil isn't always concentric with the first induction coil. The first phase power unit is connected with the first induction coil, and configured for receiving a first phase input voltage and outputting a first voltage. The second phase power unit is connected with the second induction coil, and configured for receiving a second phase input voltage and outputting a second voltage. There is a phase difference between the first phase input voltage and the second phase input voltage. The power controller is used for controlling operations of the first phase power unit and the second phase power unit. The user interface unit is connected with the power controller for controlling the power controller.Type: ApplicationFiled: March 4, 2011Publication date: October 20, 2011Applicant: DELTA ELECTRONICS, INC.Inventors: Ming-Whang Wang, Yen-Po Chen
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Publication number: 20110226758Abstract: An electromagnetic oven circuit based on SoC chip includes a power inversion circuit and a CHK-S008 type SoC chip. A CPU, comparators, an operational amplifier, an A/D converter, and an IGBT drive control module are integrated into this chip. The circuit further includes a feedback excitation IGBT driver including the IGBT drive control module, the comparator, an external driver, and an external feedback circuit connected between the output of the IGBT drive control module and the in-phase input terminal of the comparator, the output of the comparator is connected to the feedback terminal of the IGBT drive control module, the external driver is connected between the output of the drive control module and the input of the power inversion circuit for driving the power inversion circuit to work.Type: ApplicationFiled: December 4, 2009Publication date: September 22, 2011Inventors: Shouqing Qiu, Samson Xu, Chunguang Liu, Peng Li, Jinfeng Chen
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Publication number: 20110220639Abstract: A wireless inductive coupling assembly for a heated glass panel assembly is provided that includes a metal oxide coated glass panel with a panel frame, an opening frame that cooperates with the coated glass panel frame to allow the panel to cover a panel opening, a receiving coil that is positioned in the panel frame and that is wired to the panel, and a sending coil that is positioned in the opening frame and that is wired to an electrical power source. When the electrical power source supplies electrical power to the sending coil, the sending coil wirelessly induces an electrical current in the receiving coil, which causes the dielectric panel to provide heat.Type: ApplicationFiled: May 17, 2011Publication date: September 15, 2011Applicant: Engineered Glass Products, LLCInventor: Peter F. Gerhardinger
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Publication number: 20110168697Abstract: To aim to reduce ripple current flowing through a capacitor in a power converter apparatus including a converter, the capacitor and an inverter. A current sensor 6 is connected between a capacitor 5 and an inverter circuit 7 for detecting current Iinv flowing from the capacitor 5 to the inverter circuit 7. A frequency detecting subunit 11 performs fast Fourier transform on a waveform of the current Iinv to detect a frequency of a frequency component having the largest amplitude. Also, the frequency detecting subunit 12 detects a zero-cross point of the frequency component having the largest amplitude. Then a carrier signal control subunit 13 performs control such that a frequency and a rise time of a PWM carrier signal for driving the converter circuit 4 match the frequency and the zero-cross point that have been detected by the frequency detecting subunit 11 and the phase detecting subunit 12.Type: ApplicationFiled: July 30, 2010Publication date: July 14, 2011Inventors: Shun Kazama, Masaki Tagome, Makoto Kitabatake
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Publication number: 20110168696Abstract: The present invention discloses a computer with an electric heating unit, wherein the casing of a computer unit is integrated with an electric heating unit. The electric heating unit has an electric heating plane on the casing. The electric heating plane heats a heatable article placed on the casing. A support device is arranged on the casing to hold a heatable article preventing the heatable article from being accidentally knocked over.Type: ApplicationFiled: May 10, 2010Publication date: July 14, 2011Applicant: HANNSPREE, INC.Inventor: Wen-Hung Huang
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Publication number: 20110163088Abstract: The invention relates to a token, to an integrated circuit comprising the token, to a method of randomizing the token and a system for randomizing the token. The token comprises a physical unclonable function and comprising probing means for probing the physical unclonable function. The physical unclonable function comprises a capacitor comprising a dielectric medium being arranged at least partially between the electrodes of the capacitor. The dielectric medium is configured for contributing to a capacitance value of the capacitor and comprises conducting particles substantially randomly dispersed in the dielectric medium. The conducting particles comprise a phase changeable material being changeable between a first structural state having a first conductivity and a second structural state having a second conductivity different from the first conductivity.Type: ApplicationFiled: December 17, 2010Publication date: July 7, 2011Applicant: NXP B.V.Inventors: Willem Frederik Adrianus BESLING, Jinesh Balakrishna Pillai KOCHUPURACKAL
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Publication number: 20110155721Abstract: Apparatuses useful for printing and methods of fixing marking materials onto media are disclosed. An exemplary embodiment of the apparatuses useful in printing includes a first member including a first surface; a second member comprising at least one ferromagnetic material having a relative magnetic permeability greater than 1, a susceptor over the at least one ferromagnetic material, the susceptor comprising at least one electrically resistive metal, and a second surface over the at least one ferromagnetic material and the susceptor, the second surface forming a nip with the first surface at which media are received; and a magnetic field generator for generating a magnetic field to inductively heat the second member.Type: ApplicationFiled: December 28, 2009Publication date: June 30, 2011Applicant: XEROX CORPORATIONInventors: Nicholas P. KLADIAS, Gerald A. DOMOTO, Donald M. BOTT
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Publication number: 20110158672Abstract: An induction heating type fusing device to reduce the size of an induction coil and an image forming apparatus having the same, and a control method thereof. The image forming apparatus includes a printing device to form an image on a recording medium, and a fusing device to fix the image to the recording medium. The fusing device includes a heating member arranged to transfer heat to the recording medium and having a main heater and a sub heater, and an induction coil having a width equal to or less than a width of the recording medium and arranged in an axial direction of the heating member to generate a magnetic field acting on the main heater. The sub heater is arranged inside the heating member to heat both ends of the main heater.Type: ApplicationFiled: December 22, 2010Publication date: June 30, 2011Applicant: Samsung Electronics Co., LtdInventors: Sok Won PAIK, An Sik Jeong
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Publication number: 20110139770Abstract: Reduction of crosstalk between induction heating coils in an induction heating apparatus and particularly to reduction of crosstalk in a multi-zone induction heating system provides greater reliability for the power modules.Type: ApplicationFiled: December 10, 2010Publication date: June 16, 2011Applicant: Honeywell ASCa Inc.Inventors: Nicholas Dohmeier, Keith McCormick
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Publication number: 20110132901Abstract: A transverse-moving magnet magnetic heater is provided having a conductor assembly and a magnet assembly. The conductor assembly is operable to rotate relative to the magnet assembly about an axis so as to induce eddy currents in the conductor assembly when relative motion is produced between the conductor assembly and magnet assembly. The magnet assembly is operable to translate transversely into and out of magnetic engagement with the conductor assembly. The conductor assembly defines a fluid path therethrough operable to drive a working fluid therethrough and for the transfer of heat from the conductor assembly to the working fluid. The magnetic heater may be a component of a heat generation system comprising an internal combustion engine having a drive shaft for rotating the conductor assembly. The heat generated by the magnetic heater, as well as the heat generated by the engine from the engine exhaust and engine cooling system, is combined to heat a working fluid.Type: ApplicationFiled: February 17, 2011Publication date: June 9, 2011Applicant: MagTec Energy, LLC.Inventor: Timothy W. Lunneborg
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Publication number: 20110127256Abstract: A method for automatic calibration of the power of electromagnetic oven includes the following steps: 1) selecting two current test values within a range of working current of the electromagnetic oven, making it operate in the case of the current test values and zero, detecting voltage values of current signals under the three operation states; calculating, by a CPU, a coefficient k and an intercept b according to a formula y(i)=k×i+b using the three sets of data, and storing them; 2) during operation, calculating, by the CPU, a current current signal i using a voltage value y(i) of the current current signal detected by the current detection and collection circuit and the coefficient k and intercept b, according to a formula i=1/k×y(i)?b/k, and in turn calculating a current power using the current current signal and a current voltage signal.Type: ApplicationFiled: December 9, 2009Publication date: June 2, 2011Inventors: Shouqing Qiu, Xu Samson, Li Peng, Chen Jinfeng
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Publication number: 20110084063Abstract: An arrangement for induction hardening a part including a pair of separate inductors electrically isolated from each other and configured to substantially surround a part when brought into close juxtaposition with each other. The inductor sections are powered by respective secondary inductor loops brought into close juxtaposition with a primary inductor loop connected to an ac power source which induces an ac current in each inductor section.Type: ApplicationFiled: October 4, 2010Publication date: April 14, 2011Inventors: John C. Bollman, Richard J. Roth
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Publication number: 20110079591Abstract: A method for supplying power to induction cooking zones of an induction cooking hob with a plurality of power converters, each feeding an induction heating element, comprises feeding all the induction heating elements according to a predetermined and repetitive driving sequence in order to keep a predetermined delivered power to the induction heating elements according to user input.Type: ApplicationFiled: August 24, 2010Publication date: April 7, 2011Applicant: WHIRLPOOL CORPORATIONInventors: DAVIDE PARACHINI, FRANCESCO DEL BELLO, ANDREA DE ANGELIS, JURIJ PADERNO
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Publication number: 20110073590Abstract: An inductor is provided for the simultaneous inductive heating of two tracks or ways which are formed next to one another on a metallic workpiece, having a first segment which is associated with the first track or way and a second segment which is associated with the second track or way, and having two supply arms via which the segments can be connected to a power supply. To enable two tracks or ways to be heated simultaneously to the hardening temperature without heating the material portion situated between the tracks or ways the segments of the inductor and the supply arms are connected together in an inductor in such a way that the fields travelling at right angles to the longitudinal extent of the tracks or ways neutralize each other in the region of the material portion which separates the tracks or ways from one another.Type: ApplicationFiled: September 9, 2010Publication date: March 31, 2011Applicant: SMS ELOTHERM GMBHInventors: Stefan Dappen, Peter Schulte, Matthias Blum, Martin Bröcking
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Publication number: 20110036831Abstract: Apparatus and method are provided for electric induction heat treatment of electrically conductive thin strip material. Multiple series-connected coil loops, each having a pole pair, are provided in each of a top and bottom induction coil, which are positioned mirror image to each other. The top and bottom induction coils form a transverse flux induction heat treatment apparatus. A separate flux concentrator is provided over and on the side of each pole. The thin strip material passes between the poles of the top and bottom induction coils and the flux concentrators associated with each of the poles.Type: ApplicationFiled: August 9, 2010Publication date: February 17, 2011Inventors: Gregg G. WARNER, James D. PARKER, John Justin MORTIMER
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Publication number: 20110036832Abstract: The invention relates to a method for dynamic wave form correction of a power supply of an induction heating device (3), a) where an input power signal (Uin), especially an input voltage signal, comprising waves with an input power frequency (fin) is provided by an AC power source (1), b) where a frequency converter (2) rectifies the input power signal (Uin) into a half waves signal (Uh), especially a half wave voltage signal, b1) where a half wave of the half waves signal is delimited by two subsequent zero-crossings (t?, t1;t1, t2; t2, t3), b2) where the time lag between the two zero-crossings defines a half wave duration (th), c) where the frequency converter (2) further converts the half waves signal (Uh) into to a working signal (Iw), especially a working current signal, for supplying the induction heating device (3), d) where in a frequency shifting operation (5) a working frequency (fw) of the working signal (Iw) is first increased from a first working base frequency (f1) to a maximum frequency of (fmaType: ApplicationFiled: March 3, 2009Publication date: February 17, 2011Applicant: ELECTROLUX HOME PRODUCTS CORPORATION N.V.Inventors: Erik Svend Christiansen, Laurent Jeanneteau, Alex Viroli, Massinmo Zangoli, Thibaut Rigolle, Michael Herzog
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Publication number: 20110013918Abstract: Provided is a method of controlling electric power of a coil which performs induction heating in an imaging apparatus. The method includes: detecting an input current of the coil; detecting a resonant current of the coil; calculating a difference between the detected resonant current and the detected input current; and controlling electric power supplied to the coil based on the difference. These operations are repeatedly performed whenever the detected input current is changed.Type: ApplicationFiled: February 2, 2010Publication date: January 20, 2011Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventor: An-sik Jeong
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Publication number: 20100326984Abstract: There is provided an induction heating apparatus which continuously heats a steel plate using a solenoid system. The induction heating apparatus (1) includes: at least three heating coils (10A to 10D) disposed along a longitudinal direction of the steel plate to make the steel plate (2) pass through an inside thereof; and inductance adjusters (12A to 12D) disposed on electrical pathways (11) electrically connecting each of the heating coils and a power source applying a voltage to each of the heating coils and capable of generating self-induction and adjusting self-inductance in the self-induction, in which each of the inductance adjusters is disposed to cause a generation of mutual induction at least between the inductance adjusters mutually adjacent to one another.Type: ApplicationFiled: March 12, 2009Publication date: December 30, 2010Applicants: NIPPON STEEL CORPORATION, FUJI ELECTRIC SYSTEMS CO., LTD.Inventors: Hiroaki Mochinaga, Kazunari Ishizaki, Shigenobu Koga, Takaharu Kataoka, Kenji Umetsu, Yasuo Matsunaga, Yasuyuki Ikeda
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Publication number: 20100320196Abstract: An induction heating apparatus includes a current supply unit configured to supply a high-frequency current to a coil for inductively heating a conductive heating element based on a direct current obtained by rectifying AC power supplied from an AC power supply, a driving unit configured to output a drive pulse for supplying the high-frequency current from the current supply unit, a control unit configured to control a frequency of a drive pulse output by the driving unit, and a power limiting unit configured to limit an operation of the driving unit when input power determined based on an input voltage of the AC power supply and an input current to the current supply unit exceeds a predetermined value.Type: ApplicationFiled: May 25, 2010Publication date: December 23, 2010Applicant: CANON KABUSHIKI KAISHAInventor: Hidetaka Tabuchi
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Publication number: 20100319642Abstract: A roller follower includes a roller ring, a shaft and a plurality of rollers. At least one of the roller ring, the shaft and the rollers is a steel member made of steel containing 0.7 to 2.4% carbon and 10.0 to 20.0% chromium, with remainder iron and impurities. In addition, carbide containing at least any one of iron and chromium as well as carbon and having an area of 12.6 ?m2 or greater is generated at an area ratio of 5.0% or higher, at a rolling contact surface of the steel member (a roller ring rolling contact surface, a shaft rolling contact surface and a roller rolling contact surface).Type: ApplicationFiled: February 10, 2009Publication date: December 23, 2010Applicant: NTN CORPORATIONInventors: Takumi Fujita, Kousuke Obayashi
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Publication number: 20100301038Abstract: An apparatus and process are provided for induction heating of a workpiece. The workpiece is moved through an inductor to inductively heat treat the workpiece with electric power of varying frequency and duty cycle or amplitude control to control the magnitude of electric power as the frequency changes. Alternatively the workpiece may be stationary and the inductor can be moved along the workpiece, or combined and coordinated movement of both the workpiece and inductor can be used.Type: ApplicationFiled: August 9, 2010Publication date: December 2, 2010Applicant: INDUCTOTHERM CORP.Inventors: Kuno WEISS, Oleg S. FISHMAN
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Publication number: 20100288754Abstract: A feeder capable of feeding power to a load such as an electric appliance without remodeling an IH cooker already owned at home and usually used for cooking by heat, and just by putting on a plate of the IH cooker with its power ON without the need of an outlet. The feeder (100) includes a power generating coil (10) for interlinking an alternating magnetic field generated by the IH cooker (300) having a proper pan sensing function to generate an induction current and supply to the load, a blocking part (40) connected between the coil (10) and the load (200), a sensing part (50) for detecting a physical quantity generated by the coil (10), the blocking part (40) and/or the load (200) for converting it into a corresponding signal, and a control part (20) for controlling to shut the blocking part (40) based on the signal output from the sensing part (50).Type: ApplicationFiled: September 21, 2007Publication date: November 18, 2010Applicant: Kyushu Electric Power CO., Inc.Inventor: Yasuhiko Ookuma
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Publication number: 20100258554Abstract: A soldering iron system includes a power assembly that provides power to an induction heater at a variable voltage and a variable frequency. A control assembly adjusts the temperature of the heater in accordance with signals from a current detector coupled to the induction heater and a selection made by the user on an operating level selector.Type: ApplicationFiled: April 8, 2009Publication date: October 14, 2010Inventor: Mitsuhiko Miyazaki
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Publication number: 20100258555Abstract: A direct current electromagnetic heating element using the principle of electro-heat energy transferring via the DC electromagnetic field is disclosed. When the direct current is passing through a coil and fully charges a closed magnetic field, the magnetic field would form an extra 2D heating space from the DC line circuit. The magnetic medium in this 2D heating space would expel enormous heat energy. Comparing to the common AC heating devices, the heating device with the circuit via the DC electromagnetic field would save more than 40% electric power consumption.Type: ApplicationFiled: July 3, 2008Publication date: October 14, 2010Inventor: Sik Ping Cheung
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Publication number: 20100252549Abstract: The present invention relates to a method for controlling a cooking device, in particular an induction hob. The method comprises the steps of activating an overload power (POVER) for at least one electric or electronic component of the cooking device by using at least two synchronized generators, which overload power (POVER) is greater than a standard maximum power (PMAX), deactivating the overload power (POVER) after a predetermined period (?t), and operating the cooking device at a power (P), which is at most the standard maximum power (PMAX). The standard maximum power (PMAX) is provided for a permanent operation of the cooking device. The overload power (POVER) and/or the period (?t) are determined by a function depending on at least the overload power (POVER) and the period (?t). The present invention relates further to a corresponding apparatus for controlling a cooking device, in particular an induction hob.Type: ApplicationFiled: October 8, 2008Publication date: October 7, 2010Applicant: ELECTROLUX HOME PRODUCTS CORPORATION N.V.Inventors: Laurent Jeanneteau, Erik Svend Christiansen, Thibaut Rogolle, Massimo Zangoli, Mario Barocci
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Publication number: 20100219182Abstract: An apparatus for heating a material that is susceptible to RF heating by an RF antenna array. The apparatus includes a source of RF power connected to an antenna array having a plurality of loop antenna sections connected to each other by dipole antenna sections wherein the loop antenna sections and dipole antenna sections create a magnetic near field and an electric near field such that the ratio of magnetic field strength to electric field strength is approximately a predetermined value. Material is heated by the apparatus by placing the material in the near fields of the antenna array and creating magnetic near fields and electric near fields that approximate a ratio that is predetermined to efficiently heat the material and connecting the antenna array to an RF power source.Type: ApplicationFiled: March 2, 2009Publication date: September 2, 2010Applicant: Harris CorporationInventor: Francis Eugene Parsche
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Publication number: 20100201040Abstract: The invention concerns a device for heating a surface by induction, in particular for molding or transforming a part made of thermoplastic or thermosetting composite material. The device comprises a body having at least one portion made of magnetic and heating conducting material wherein is provided a plurality of closed cavities proximate the surface to be heated, each cavity surrounding a field winding. The heat produced by induction on the walls of the cavity is transferred by conduction to the heating surface. The distance between the cavities and the position of said cavities relative to the heating surface are such that the heating is substantially uniform on said surface.Type: ApplicationFiled: April 11, 2006Publication date: August 12, 2010Applicant: ROCTOOLInventors: Alexandre Guichard, Jose Feigenblum
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Patent number: 7772530Abstract: An apparatus and process are provided for induction heating of a workpiece. The workpiece is moved through an inductor to inductively heat treat the workpiece with electric power of varying frequency and duty cycle or amplitude control to control the magnitude of electric power as the frequency changes. Alternatively the workpiece may be stationary and the inductor can be moved along the workpiece, or combined and coordinated movement of both the workpiece and inductor can be used.Type: GrantFiled: June 10, 2007Date of Patent: August 10, 2010Assignee: Inductotherm Corp.Inventors: Kuno Weiss, Oleg S. Fishman
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Publication number: 20100181301Abstract: A method for the synchronization of induction coils supplied by power converters and acting on a common heating zone or on adjacent heating zones of an induction heating system, particularly of an induction cooking hob, comprises the steps of activating a first power converter, detecting a parameter correlated to the magnetic field generated by the first power converter and activating a second power converter by using the parameter as synchronization signal, the parameter being induction coil voltage or induction coil current or a combination thereof.Type: ApplicationFiled: January 14, 2010Publication date: July 22, 2010Applicant: WHIRLPOOL CORPORATIONInventor: DIEGO NEFTALI GUTIERREZ
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Publication number: 20100181306Abstract: A method for controlling resonant power converters using power transistors, particularly for induction heating systems, comprises a step of assessing the occurrence of non-zero voltage switching or non-zero current switching and a step of adjusting the control accordingly, the assessment of the above occurrence being performed by monitoring at least one electrical parameter correlated to the resonant circuit.Type: ApplicationFiled: January 14, 2010Publication date: July 22, 2010Applicant: WHIRLPOOL CORPORATIONInventors: DIEGO NEFTALI GUTIERREZ, CARLO CALESELLA, DAVIDE PARACHINI
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Publication number: 20100181302Abstract: A method and cooktop include a cooktop panel, a cooking zone, and an induction heating device disposed below the cooktop panel. First, second and third heat sensor units are disposed beneath the cooktop panel in a region of a measuring spot. The first heat sensor unit is configured to measure heat flow from substantially only the cooktop panel. The second and third heat sensor units are configured to measure heat flow from the cooktop panel and a cooking utensil disposed thereon. A light source is provided for measuring an emissivity of the bottom of the cooking utensil. An auxiliary heater heats the region of the measuring spot. An electrical control system calculates a ratio from signals of the second and third heat sensor units and determines an actual temperature of the bottom of the cooking utensil from the ratio by using a temperature of a lower surface of the cooktop panel measured by the first sensor unit and a value of the emissivity of the cooking utensil bottom.Type: ApplicationFiled: June 4, 2008Publication date: July 22, 2010Applicant: MIELE & CIE. KGInventors: Holger Ernst, Uwe Femmer, Sonja Heitmann, Thomas Kruempelmann
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Publication number: 20100176120Abstract: There is provided an induction heating cooker capable of preventing a pan having a pan bottom warped in a convex shape or a pan having a pan bottom with a small thickness from being excessively heated. The induction heating cooker includes a heating coil (2) operable to perform induction heating of a cooking container, an inverter circuit (7) operable to supply a high-frequency current to the heating coil, an infrared ray sensor (3) operable to detect an infrared ray radiated from the cooking container, an electric power integrating section (81) operable to integrate an amount of heating electric power outputted from the inverter circuit, and a heating control section (82) operable to control the output of the inverter circuit.Type: ApplicationFiled: June 23, 2008Publication date: July 15, 2010Inventors: Kenji Watanabe, Izuo Hirota, Hiroshi Tominaga, Tomoya Fujinami, Keiko Isoda
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Publication number: 20100163551Abstract: An object of the present invention is to provide an induction heater and an induction heating method capable of heating by induction a work in which a gear portion and a shaft are integrated. An induction heater for a gear portion and a stepped shaft is arranged in such a manner that a first heating coil (annular coil) surrounds the gear portion and that a second heating coil (linear coil) faces the stepped shaft in an axial direction. Alternating currents of different frequencies are supplied to the first heating coil 1 and the second heating coil. Further, a part of the second heating coil is arranged so as to come opposite a boundary between the gear portion and the stepped shaft, thereby connecting a hardened pattern of the gear portion by the first heating coil and a hardened pattern of the stepped shaft by the second heating coil.Type: ApplicationFiled: December 15, 2009Publication date: July 1, 2010Inventors: Junji Minoue, Takehiko Nagao
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Patent number: 7741731Abstract: A PWM power regulator device has a processor, an input interface circuit, a zero phase detecting circuit and a thyristor. The input interface circuit is connected to a PWM output terminal of an external digital control circuit and the processor. The processor calculates a period and duty cycle of a PWM signal from the PWM output terminal and then outputs a triggering signal to the thyristor. The thyristor is triggered at different conduct angle according to the triggering signal and the triggering signal is determined by the processor according to the PWM signal. Therefore, the power regulator device is directly connected to the PWM output terminal of the digital control circuit without digital to analog converter.Type: GrantFiled: October 30, 2008Date of Patent: June 22, 2010Assignee: Arico Technology Co., Ltd.Inventor: Nan-Cheng Chiang
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Publication number: 20100147833Abstract: An apparatus and related method for inductively heating a workpiece is disclosed. A first magnetic unit is rotated about a metallic workpiece utilizing a super-conducting spool, while a second magnetic unit can be utilized to generate an exterior magnetic field operable to drive the first magnetic unit.Type: ApplicationFiled: February 22, 2010Publication date: June 17, 2010Applicant: ZENERGY POWER GMBHInventors: Carsten Buehrer, Jens Mueller
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Publication number: 20100141914Abstract: A lithographic apparatus includes a movable first object, and a heat exchanger including a heat exchanging body, the heat exchanging body including a material with electro-caloric or magneto-caloric properties and configured to affect the temperature of the first object by exchanging heat with the movable first object, and a generator configured to supply an electromagnetic field to the heat exchanging body to change the temperature of the heat exchanging body in order to cool or heat the first object.Type: ApplicationFiled: November 16, 2009Publication date: June 10, 2010Applicant: ASML NETHERLANDS B.V.Inventors: Noud Jan GILISSEN, Theodorus Petrus Maria Cadee
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Publication number: 20100126642Abstract: The invention relates to the hardening of the surface layer of parts of machines, plants and apparatuses and also tools. Objects for which the application is possible and advantageous are components which are subjected to severe fatigue or wear stresses and are composed of hardenable steels and have a complicated shape and whose surface has to be hardened selectively on the functional surfaces or whose functional surface has a multidimensional shape. The process for hardening the surface layer of components having a complicated shape is carried out by means of a plurality of energy input zones.Type: ApplicationFiled: October 10, 2007Publication date: May 27, 2010Inventors: Berndt Brenner, Steffen Bonss, Frank Tietz, Marko Seifert, Jan Hannweber, Stefan Kuehn, Udo Karsunke
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Patent number: 7701677Abstract: A coil system for inductively heating a superconducting magnet in order to provide an internal energy dump by uniformly quenching a high performance superconducting magnet. The quench-inducing system uses AC magnetic fields that require negligible reactive power. The system is especially suited for inducing a relatively uniform quench in dry superconducting magnets.Type: GrantFiled: September 7, 2006Date of Patent: April 20, 2010Assignees: Massachusetts Institute of Technology, Still River Systems, Inc.Inventors: Joel Henry Schultz, Leonard Myatt, Leslie Bromberg, Joseph V. Minervini, Timothy Antaya
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Patent number: 7696458Abstract: A system and method for inductively heating a work piece. The induction heating system is coupleable to at least one temperature feedback device. The temperature feedback device is disposed within the induction heating system to provide a signal representative of the temperature of an induction heating system component. The induction heating system is operable to control the output of the induction heating system based on the temperature of the induction heating system component to protect the component from heat damage.Type: GrantFiled: June 3, 2005Date of Patent: April 13, 2010Assignee: Illinois Tool Works Inc.Inventors: Jeffrey R. Thomas, Randall G. Baxter, Paul D. Verhagen, Edward G. Beistle, Brian J. Veik
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Publication number: 20100059507Abstract: An apparatus for heat treating metals includes a container configured for receiving a metal therein for heat treatment, a first power supply configured for generating a first electric field and applying a first voltage U1 represented by a following formula: U 1 = { u 1 ? cos ? ( 2 ? ? ? ? ? f ? ? t ) ? ( ( 2 ? n + 1 / 2 ) ? ? ? 2 ? ? ? ? f ? ? t ? ( 2 ? n + 3 / 2 ) ? ? ) - u 2 ? ( 2 ? ? n ? ? ? < 2 ? ? ? ? ? f ? ? t ? ( 2 ? n + 1 / 2 ) ? ? , ( 2 ? ? n + 3 / 2 ) ? ? ? 2 ? ? ? ? ? f ? ? t ? ( 2 ? n + 2 ) ? ? ) , and a second power supply configured for generating a second electric field having opposite direction to the first electric field applying a second voltage U2 represented by a following formula: U 2 = { - u 1 ? cos ? ( 2 ? ? ? ? ? f ? ? t ) ? ( 2 ? ? n ? ? ? < 2 ? ? ? ? ? f ? ? t ? ( 2 ? n +Type: ApplicationFiled: April 3, 2009Publication date: March 11, 2010Applicant: HON HAI PRECISION INDUSTRY CO., LTD.Inventor: Ga-Lane Chen
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Publication number: 20100044367Abstract: An induction heating device includes a main body, an induction coil provided in the main body and forming an electromagnetic field, and an induction coil driving circuit unit positioned in the main body to be physically and thermally separated from the induction coil.Type: ApplicationFiled: August 21, 2008Publication date: February 25, 2010Applicant: LG Electronics Inc.Inventors: Won Tae KIM, Seung Hee Ryu, Byeong Wook Park
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Publication number: 20090314771Abstract: An infrared sensor for detecting infrared rays of light and a light emitting element are disposed below a light transmittable top plate, which has a hearing area for heating an article to be heated placed thereon, in juxtaposed fashion relative to each other, so that infrared rays of light radiated from the article to be heated may be guided towards the infrared sensor. A light guide portion is provided for guiding rays of flight, emitted from the light emitting element, towards a heating area of the top plate, and the rays of light emitted from the light emitting element and guided by the light guide portion are projected onto the top plate through an upper opening of the light guide portion so that such rays of light can be noticed with eyes within the heating area.Type: ApplicationFiled: December 18, 2007Publication date: December 24, 2009Inventors: Kazuichi Okada, Masahiro Yokono
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Publication number: 20090289055Abstract: An inductively-heated applicator system including a heating module and an applicator, such as an applicator pen. The heating module include a dock for seating the applicator. The heating module includes circuitry to selectively generate an electromagnetic field to wirelessly provide energy to the applicator when it is positioned in the dock. The heating module may also include temperature control circuitry to monitor and/or control the temperature of the applicator. The applicator pen includes a heating element that it heated through energy provided by the electromagnetic field. The heating element may be directly inductively heated by the electromagnetic field. The heating element may be a roller element that heats and applies the product. Alternatively, the applicator may include a secondary in which electrical power is induced when the electromagnetic field is present. In this alternative, the power may be applied to the heating element to produce resistive heat.Type: ApplicationFiled: May 23, 2008Publication date: November 26, 2009Applicant: ACCESS BUSINESS GROUP INTERNATIONAL LLCInventors: David W. Baarman, Richard Bylsma, Thomas Jay Leppien, Jesse C. Leverett, Steve O. Mork