Of A Resonant Circuit Patents (Class 324/652)
  • Patent number: 10401238
    Abstract: In some examples, a sensor comprises a circuit including an inductor. The inductor comprises an inductor layer, a reference layer comprising at least one of an electrically conductive material or a magnetic material, and a variable layer formed between the reference layer and inductor layer. A thickness of the variable layer may be configured to change upon application of a force external to the variable layer thereby causing a change in position of the reference layer relative the inductor layer, and the change in position of the reference layer relative the inductor layer changes an inductance of the inductor. The sensor may be configured to detect the force based on the change in inductance of the inductor.
    Type: Grant
    Filed: February 23, 2015
    Date of Patent: September 3, 2019
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Andrew P. Bonifas, Jaewon Kim, Jung-Ju Suh
  • Patent number: 10305282
    Abstract: For initiating a control function based on a real time available fault current measurement, a measurement module measures an operating voltage, a short voltage, and a ring parameter of alternating current power lines. A processor calculates an impedance of the power lines as a function of the operating voltage, the short voltage, and the ring parameter. The processor further calculates a dynamic available fault current as a function of the impedance. In addition, the processor initiates a control function based on the available fault current.
    Type: Grant
    Filed: April 20, 2017
    Date of Patent: May 28, 2019
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Kurt R. Mickler, David C. Mazur
  • Patent number: 9625506
    Abstract: A resistance is measured without physical contact/connection to the resistance. A resistive element to be measured is provided, physically connected as part of a passive electrical circuit. Without physically contacting the resistive element, an electromagnetic field is used to produce an excitation in the passive electrical circuit. The resistance of the resistive element is determined based on an effect of the excitation on the electromagnetic field.
    Type: Grant
    Filed: April 11, 2014
    Date of Patent: April 18, 2017
    Assignee: Texas Instruments Incorporated
    Inventor: Steven Rowland Widener
  • Patent number: 9316674
    Abstract: A method for contactlessly checking the functionality of an antenna coil for a portable data carrier comprises the steps of exciting the antenna coil, detecting the free, damped oscillation of the antenna coil in response to the excitation, and evaluating the detected free, damped oscillation. The excitation of the antenna coil is effected inductively through a pulsed magnetic field, which may be generated by a single direct-current pulse, such as a Dirac pulse, by means of an exciting coil attached to a pulse generator. The detection of the oscillation of the antenna coil is effected through a measuring antenna, and the evaluation is effected by means of an evaluation device connected to the measuring antenna.
    Type: Grant
    Filed: September 5, 2012
    Date of Patent: April 19, 2016
    Assignee: GIESECKE & DEVRIENT GMBH
    Inventors: Michael Baldischweiler, Klaus Finkenzeller, Carsten Bohn
  • Patent number: 9041416
    Abstract: Wireless sensors configured to record and transmit data as well as sense and, optionally, actuate to monitor physical properties of an environment and, optionally, effect changes within that environment. In one aspect, the wireless sensor can have a power harvesting unit; a voltage regulation unit, a transducing oscillator unit, and a transmitting coil. The voltage regulation unit is electrically coupled to the power harvesting unit and is configured to actuate at a minimum voltage level. The transducing oscillator unit is electrically coupled to the voltage regulation unit and is configured to convert a sensed physical property into an electrical signal. Also, the transmitting coil is configured to receive the electrical signal and to transmit the electrical signal to an external antenna.
    Type: Grant
    Filed: August 17, 2012
    Date of Patent: May 26, 2015
    Assignee: St. Jude Medical Luxembourg Holdings II S.à.r.l.
    Inventors: Jin Woo Park, Florent Cros, Mark G. Allen
  • Patent number: 9037418
    Abstract: Methods and sensors for selective fluid sensing are provided. Each sensor includes a resonant inductor-capacitor-resistor (LCR) sensor that is coated with a sensing material. In order to collect data, an impedance spectrum is acquired over a relatively narrow frequency range, such as the resonant frequency range of the LCR circuit. A multivariate signature may be calculated from the acquired spectrum to discern the presence of certain fluids and/or fluid mixtures. The presence of fluids is detected by measuring the changes in dielectric, dimensional, resistance, charge transfer, and other changes in the properties of the materials employed by observing the changes in the resonant electronic properties of the circuit. By using a mathematical procedure, such as principal components analysis (PCA) and others, multiple fluids and mixtures can be detected in the presence of one another, even in a high humidity environment or an environment wherein one or more fluids has a substantially higher concentration (e.g.
    Type: Grant
    Filed: September 19, 2013
    Date of Patent: May 19, 2015
    Assignee: General Electric Company
    Inventors: Radislav Alexandrovich Potyrailo, Cheryl Margaret Surman, Andrew Arthur Paul Burns, Nandini Nagraj
  • Publication number: 20150123679
    Abstract: A wireless remote sensor (110) that is powered by an inductive transmitter (112) and is configured to produce an oscillating wave that varies based on one or more sensed parameters. The oscillating wave is communicated to the inductive transmitter (112) by reflected impedance, where it can be detected to determine the sensed value(s). In another aspect, the present invention provides a wireless remote sensor with a Wheatstone bridge arrangement having an internal resonant circuit to produce an electromagnetic field indicative of the sensed value. In a third aspect, the present invention provides a wireless remote sensor with optical feedback from a reference circuit and a sensor circuit. In a fourth aspect, the present invention provides a wireless remote temperature sensor having coils printed on a material with a high coefficient of thermal expansion so that the size and/or shape of the coils varies as the temperature increases or decreases.
    Type: Application
    Filed: March 14, 2013
    Publication date: May 7, 2015
    Inventors: Neil W. Kuyvenhoven, Cody D. Dean, David W. Baarman, Benjamin C. Moes, Hai D. Nguyen, Matthew J. Norconk, Joshua K. Schwannecke, Joshua B. Taylor, Joseph S. Melton, Jr., Ronald L. Stoddard
  • Patent number: 8917102
    Abstract: A method for measuring a capacitance using a capacitance meter. The capacitance meter includes an AC power source with a controllable frequency which is fed to a capacitor to measure its capacitance. A first measurement of the capacitance is performed by the capacitance meter using a first frequency. When the first measurement of the capacitance indicates the capacitance is below a threshold capacitance a lower capacitance measurement is performed in the capacitance meter, using a second measurement of the capacitance using a second frequency. When the first measurement of the capacitance indicates the capacitance is above a threshold capacitance, a higher capacitance measurement is performed in the capacitance meter, using a second measurement of the capacitance using a third frequency, the third frequency being lower than the second frequency.
    Type: Grant
    Filed: September 17, 2010
    Date of Patent: December 23, 2014
    Assignee: ABB Technology AG
    Inventors: Alf Brodin, Jon Lissmats, Jerry Svedlund, Hans Olof Fröjd
  • Publication number: 20140347075
    Abstract: A detection coil is incorporated in a self-oscillation circuit. The oscillation frequency of the self-oscillation circuit, which comprises the coil and a capacitor, is set to a high frequency band (e.g., around 1 MHz or higher). A target section whose relative position to the coil section varies in response to displacement of a detection object, and includes a magnetism-responsive member constructed to cause inductance of the coil to vary with the relative position. A rectifier circuit extracts an amplitude level of an oscillation output signal of the self-oscillation circuit and outputs the extracted level as detected position data. For example, a plurality of self-oscillation circuits are provided. Alternatively, a single self-oscillation circuit forms a plurality of series circuits by, for each coil pair, connecting in series the two coils of the coil pair, and includes the result of connecting the series circuits in parallel as an inductor element for self-oscillation.
    Type: Application
    Filed: December 13, 2012
    Publication date: November 27, 2014
    Inventors: Atsutoshi Goto, Daisuke Goto, Kazuya Sakamoto, Hiroshi Sakamoto, Yasuhiro Yuasa
  • Patent number: 8773117
    Abstract: A conductivity sensor is disclosed. The conductivity sensor includes an oscillator for providing an input signal and a reactive circuit having an induction coil, a capacitive element, and a resistive element connected in parallel. The induction coil is adapted to be placed adjacent to a specimen. The conductivity sensor further includes a control circuit for driving the reactive circuit to resonance when the induction coil is placed adjacent to the specimen. The reactive coil is configured to provide an output signal having a parameter representative of the conductivity of the specimen when the reactive circuit is at resonance. The induction coil may include a first conductive element that spirals outward to an external perimeter and a second conductive element operably connected to the first conductive element. The second conductive element spirals inward from the external perimeter staggered relative to the first conductive element.
    Type: Grant
    Filed: January 30, 2013
    Date of Patent: July 8, 2014
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventors: Joseph R. Feldkamp, Jeffrey Robert Heller, Douglas Glen Laudenslager
  • Patent number: 8686743
    Abstract: A substrate including a sensor unit, wherein the sensor unit includes a coil wound at least once arranged on the surface of the sensor or embedded within and near the surface thereof. With such an arrangement, an electric current that corresponds to information with respect to the substrate (e.g., the temperature of the substrate or the amount of charge stored in the substrate) flows through the coil.
    Type: Grant
    Filed: November 19, 2009
    Date of Patent: April 1, 2014
    Assignees: Philtech Inc., Shinko Electric Industries Co., Ltd.
    Inventors: Yuji Furumura, Naomi Mura, Koki Tamagawa, Tadayoshi Yoshikawa, Hiroshi Yonekura
  • Patent number: 8686742
    Abstract: The present invention relates to a method and a system for on-site and full-scale testing of wind turbine plants. In particular, the present invention relates to a method and a system applying resonance circuits tuned with the fundamental frequency, or harmonics thereof, of a power supply grid connected to a wind turbine plant to be tested. The wind turbine plant to be tested may remain connected to the power supply grid during on-site and full-scale testing.
    Type: Grant
    Filed: December 16, 2009
    Date of Patent: April 1, 2014
    Assignee: Vestas Wind Systems A/S
    Inventors: Jorge Martinez Garcia, Philip Carne Kjaer, Peter Nielsen
  • Patent number: 8558555
    Abstract: It is an object to provide a test method of a process, an electric characteristic, and a mechanical characteristic of a structure body in a micromachine without contact. A structure body including a first conductive layer, a second conductive layer provided in parallel to the first conductive layer, and a sacrifice layer or a space provided between the first conductive layer and the second conductive layer is provided; an antenna connected to the structure body is provided; electric power is supplied to the structure body wirelessly through the antenna; and an electromagnetic wave generated from the antenna is detected as a characteristic of the structure body.
    Type: Grant
    Filed: September 23, 2010
    Date of Patent: October 15, 2013
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Mayumi Yamaguchi, Konami Izumi, Fuminori Tateishi
  • Patent number: 8547110
    Abstract: Devices and methods of the invention can be used in many industries, including, but not limited to, utilities, agriculture, food, textile, pharmaceutical, photovoltaic and semiconductor, medical devices, chemical and petro-chemical, material science, and defense, where monitoring and/or analysis of various properties of materials are desired. Sensors and methods of using same are provided for measuring at least one impedance of an object under test (or a tested object) at a predetermined frequency and/or a predetermined frequency range, particularly where resonance conditions are provided for such measurement.
    Type: Grant
    Filed: September 22, 2010
    Date of Patent: October 1, 2013
    Assignee: Adem, LLC
    Inventors: Boris Kesil, Yury Nikolenko
  • Patent number: 8542023
    Abstract: Methods and sensors for selective fluid sensing are provided. Each sensor includes a resonant inductor-capacitor-resistor (LCR) sensor that is coated with a sensing material. In order to collect data, an impedance spectrum is acquired over a relatively narrow frequency range, such as the resonant frequency range of the LCR circuit. A multivariate signature may be calculated from the acquired spectrum to discern the presence of certain fluids and/or fluid mixtures. The presence of fluids is detected by measuring the changes in dielectric, dimensional, resistance, charge transfer, and other changes in the properties of the materials employed by observing the changes in the resonant electronic properties of the circuit. By using a mathematical procedure, such as principal components analysis (PCA) and others, multiple fluids and mixtures can be detected in the presence of one another, even in a high humidity environment or an environment wherein one or more fluids has a substantially higher concentration (e.g.
    Type: Grant
    Filed: November 9, 2010
    Date of Patent: September 24, 2013
    Assignee: General Electric Company
    Inventors: Radislav Alexandrovich Potyrailo, Cheryl Margaret Surman, Andrew Arthur Paul Burns, Nandini Nagraj
  • Patent number: 8542024
    Abstract: Methods and sensors for selective fluid sensing are provided. A sensor includes a resonant inductor-capacitor-resistor (LCR) circuit and a sensing material disposed over a sensing region. The sensing region comprises at least a portion of the LCR circuit. Temperature-dependent response coefficients of inductance L, capacitance C, and resistance R properties of the LCR circuit and the sensing material are at least approximately 5 percent different from one another. The difference in the temperature-dependent response coefficients of the properties of the LCR circuit and the sensing material enables the sensor to selectively detect analyte fluids from an analyzed fluid mixture substantially independent of temperature.
    Type: Grant
    Filed: December 23, 2010
    Date of Patent: September 24, 2013
    Assignee: General Electric Company
    Inventors: Radislav Alexandrovich Potyrailo, Cheryl Margaret Surman
  • Patent number: 8519721
    Abstract: A method is disclosed for compensation of system tolerances in an inductive coupler which includes a power generator that feeds an alternating current into a series resonance circuit formed by a resonance capacitor and an inductive rotating transmission device. First, a brief sequence of at least one period of an alternating current is fed by the power generator into the series resonance circuit. Then the series resonance circuit is short-circuited. A first resonance frequency is measured. Then a longer sequence having a plurality of periods of an alternating-current voltage is generated by the power generator, so that a given small voltage is built up at the load. Now a second resonance frequency is measured while the resonance circuit is short-circuited. Then at least one correcting variable for the power generator is determined from the two resonance frequencies.
    Type: Grant
    Filed: March 10, 2011
    Date of Patent: August 27, 2013
    Assignee: Schleifring und Apparatebau GmbH
    Inventors: Nils Krumme, Arno Zimpfer, Stefan Fischer
  • Publication number: 20130181726
    Abstract: A device for detecting and quantifying a force applied on a surface comprising a test specimen, an electrically insulating substrate, a first electrode bound to the substrate, a second electrode, an assembly of conductive or semi-conductive nanoparticles in contact with the two electrodes, and a measurement device. The measurement device provides proportional information with respect to an electrical property of the nanoparticles assembly. The electrical property is measured between the first and second electrode. The test specimen is the nanoparticles assembly itself and the electrical property is sensitive to the distance between the nanoparticles of the assembly. The invention uses the nanoparticles assembly itself as a test specimen and allows a force to be quantified even if the nanoparticles assembly is deposited on a rigid substrate.
    Type: Application
    Filed: August 1, 2011
    Publication date: July 18, 2013
    Applicants: NANOMADE CONCEPT, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, INSTITUT NATIONAL DES SCIENCES APPLIQUEES DE TOULOUSE
    Inventors: Benoît Viallet, Laurence Ressier, Jérémie Grisolia, Lionel Songeon, ERIC Mouchel La Fosse, Lukas Czornomaz
  • Patent number: 8482298
    Abstract: An automotive urea solution monitoring device is deployed in conjunction with the urea tank of a selective catalytic reduction vehicle. An RF signal of a constant frequency may be generated across a resonant circuit, which may be comprised of an inductor and a PCB trace capacitor, or the like. Electromagnetic radiation is propagated into the automotive urea solution in the urea tank. The conductivity and dielectric properties of the liquid change the impedance of the discrete/trace capacitor and or the discrete/trace inductor. These changes are proportional to ammonia content, temperature, and/or level of the automotive urea solution in the urea tank and are preferably detected by a microcontroller, or the like, and then transmitted to a selective catalytic reduction vehicle engine management system, or the like.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: July 9, 2013
    Assignee: Schrader Electronics Ltd.
    Inventors: Idir Boudaoud, Alan Kenneth McCall, Adrian M. Page
  • Patent number: 8432169
    Abstract: A proximity sensor has an oscillation circuit, an amplitude measurement circuit, a control circuit and a signal processing circuit. The oscillation circuit has an LC resonant circuit and an oscillation control circuit that is configured to supply an electric current to the LC resonant circuit to generate oscillating voltage across the LC resonant circuit. The amplitude measurement circuit is configured to produce an amplitude signal corresponding to the amplitude of the oscillating voltage. The control circuit is configured to set the negative conductance of the oscillation control circuit to a critical value by which the LC resonant circuit can oscillate based on the amplitude signal. The signal processing circuit is configured to produce a distance signal corresponding to the distance between an object and the sensing coil based on a parameter associated with the negative conductance.
    Type: Grant
    Filed: September 19, 2008
    Date of Patent: April 30, 2013
    Assignee: Panasonic Corporation
    Inventors: Masahisa Niwa, Kunitaka Okada, Fumihiro Kasano, Sukoya Tawaratsumida
  • Patent number: 8410792
    Abstract: A resonator arrangement has a conductive, semi-open outer housing, at an interior of which a conductive bar is provided disposed coaxially to the housing. At one end of the bar in a direction of a housing bottom, the bar has a die and, together with a dielectric and the housing bottom, forms a capacitor. The bar is short-circuited to the housing at another end, so that the bar and housing together form an LC oscillator circuit. Also disclosed is a method for analyzing a sample using a resonator arrangement.
    Type: Grant
    Filed: March 1, 2010
    Date of Patent: April 2, 2013
    Assignee: Forschungszentrum Juelich GmbH
    Inventors: Norbert Klein, Svetlana Vitusevich, Serhiy Danylyuk
  • Patent number: 8405404
    Abstract: An assembly (1) for detecting an electric discontinuity that includes an exciter (6) connected, via at least one capacitor, to two contacts (2, 3) normally connected between them by an electrically conducting member (4). The circuit outside the exciter defines a resonating circuit having an impedance that changes upon the opening of one of the contacts. The frequency of the detection circuit, which varies between two values corresponding to the two open or closed states of the contacts, is used by an electronic processing module (8) that generates a dysfunctional signal upon opening of one of the contacts. The invention can be used in numerous fields, such as transport, handling, storage, etc.
    Type: Grant
    Filed: November 14, 2008
    Date of Patent: March 26, 2013
    Assignee: Lohr Industrie
    Inventor: Sebastien Vanaud
  • Patent number: 8384378
    Abstract: A conductivity sensor is disclosed. The conductivity sensor includes an oscillator for providing an input signal and a reactive circuit having an induction coil, a capacitive element, and a resistive element connected in parallel. The induction coil is adapted to be placed adjacent to a specimen. The conductivity sensor further includes a control circuit for driving the reactive circuit to resonance when the induction coil is placed adjacent to the specimen. The reactive coil is configured to provide an output signal having a parameter representative of the conductivity of the specimen when the reactive circuit is at resonance. The induction coil may include a first conductive element that spirals outward to an external perimeter and a second conductive element operably connected to the first conductive element. The second conductive element spirals inward from the external perimeter staggered relative to the first conductive element.
    Type: Grant
    Filed: May 12, 2009
    Date of Patent: February 26, 2013
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventors: Joseph R. Feldkamp, Jeffrey Robert Heller, Douglas Glenn Laudenslager
  • Publication number: 20120313649
    Abstract: Wireless sensors configured to record and transmit data as well as sense and, optionally, actuate to monitor physical properties of an environment and, optionally, effect changes within that environment. In one aspect, the wireless sensor can have a power harvesting unit; a voltage regulation unit, a transducing oscillator unit, and a transmitting coil. The voltage regulation unit is electrically coupled to the power harvesting unit and is configured to actuate at a minimum voltage level. The transducing oscillator unit is electrically coupled to the voltage regulation unit and is configured to convert a sensed physical property into an electrical signal. Also, the transmitting coil is configured to receive the electrical signal and to transmit the electrical signal to an external antenna.
    Type: Application
    Filed: August 17, 2012
    Publication date: December 13, 2012
    Inventors: Jin Woo Park, Florent Cros, Mark G. Allen
  • Publication number: 20120235690
    Abstract: A method is provided for selectively detecting the presence and concentration of at least four analytes in a mixture. In certain embodiments, the method comprises contacting a single sensor with the mixture of analytes, wherein the sensor comprises at least one resonant sensor circuit comprising a sensing material that comprises at least two material properties that change in the presence of four or more analytes in their mixtures, and generating a multivariate sensor response pattern. The methods disclosed herein further optionally comprise performing analyte classification and analyte quantitation. Methods for selectively detecting the concentration of at least one analyte in a mixture further comprising at least one interference are also described in the instant application.
    Type: Application
    Filed: May 31, 2012
    Publication date: September 20, 2012
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Radislav Alexandrovich Potyrailo, Matthew Damian Pietrzykowski, Yongjae Lee
  • Patent number: 8264240
    Abstract: Wireless sensors configured to record and transmit data as well as sense and, optionally, actuate to monitor physical properties of an environment and, optionally, effect changes within that environment. In one aspect, the wireless sensor can have a power harvesting unit; a voltage regulation unit, a transducing oscillator unit, and a transmitting coil. The voltage regulation unit is electrically coupled to the power harvesting unit and is configured to actuate at a minimum voltage level. The transducing oscillator unit is electrically coupled to the voltage regulation unit and is configured to convert a sensed physical property into an electrical signal. Also, the transmitting coil is configured to receive the electrical signal and to transmit the electrical signal to an external antenna.
    Type: Grant
    Filed: July 20, 2009
    Date of Patent: September 11, 2012
    Assignee: CardioMems, Inc.
    Inventors: Jin Woo Park, Florent Cros, Mark G. Allen
  • Patent number: 8228075
    Abstract: A test system for a radio frequency IC device includes a radio frequency IC chip and a radiation strip. The characteristics of the radio frequency IC device are measured by bringing the tip of a probe of a test apparatus in direct contact with a portion of the radiation strip and thereby providing a radio frequency signal. The tip of the probe is made to be a flat plate so as to obtain closer and more stable contact with the radiation strip.
    Type: Grant
    Filed: February 19, 2009
    Date of Patent: July 24, 2012
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Yuya Dokai, Noboru Kato
  • Publication number: 20120161787
    Abstract: Methods and sensors for selective fluid sensing are provided. A sensor includes a resonant inductor-capacitor-resistor (LCR) circuit and a sensing material disposed over a sensing region. The sensing region comprises at least a portion of the LCR circuit. Temperature-dependent response coefficients of inductance L, capacitance C, and resistance R properties of the LCR circuit and the sensing material are at least approximately 5 percent different from one another. The difference in the temperature-dependent response coefficients of the properties of the LCR circuit and the sensing material enables the sensor to selectively detect analyte fluids from an analyzed fluid mixture substantially independent of temperature.
    Type: Application
    Filed: December 23, 2010
    Publication date: June 28, 2012
    Applicant: General Electric Company
    Inventors: Radislav Alexandrovich Potyrailo, Cheryl Margaret Surman
  • Patent number: 8203349
    Abstract: A proximity and contact sensor (10) is provided with a sensor element (11) and a detection circuit (16). The sensor element is provided with a matrix (13) in which coil-shaped carbon fibers (12) are dispersed. A high-frequency oscillation circuit (19) of the detection circuit (16) supplies the sensor element with a high-frequency signal. A detector (22) in the detection circuit (16) receives an output signal from the sensor element (11) and detects proximity of an object (24). In one example, the coil-shaped carbon fibers (12) are contained in the matrix by 1 to 20% by weight. In another example, a high-frequency oscillation circuit generates a high-frequency signal of 100 to 800 kHz.
    Type: Grant
    Filed: January 23, 2007
    Date of Patent: June 19, 2012
    Assignees: Shimadzu Corporation, CMC Technology Development Co., Ltd.
    Inventors: Seiji Motojima, Shaoming Yang, Makoto Takaki, Kenji Kawabe
  • Patent number: 8188752
    Abstract: An apparatus for measuring component performance including a feed line having an input port and an output port, a first resonator connected to the feed line, a first Josephson junction device connected to the first resonator and to ground, and a second resonator connected to the feed line and to ground.
    Type: Grant
    Filed: July 14, 2009
    Date of Patent: May 29, 2012
    Assignees: International Business Machines Corporation, Raytheon BBN Technologies Corp.
    Inventors: Mark B. Ketchen, Shwetank Kumar, Matthias Steffen, Christopher B. Lirakis, Richard Lazarus
  • Publication number: 20120104998
    Abstract: A non-contact power transmission device includes an alternating current power supply, a resonant system, a load, an impedance measuring section and an analyzing section. The resonant system has a primary coil connected to the alternating current power supply, a primary-side resonant coil, a secondary-side resonant coil and a secondary coil. The load is connected to the secondary coil. The impedance measuring section can measure the input impedance of the resonant system. The analyzing section analyzes the measurement results obtained from the impedance measuring section.
    Type: Application
    Filed: February 8, 2010
    Publication date: May 3, 2012
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Kazuyoshi Takada, Sadanori Suzuki, Kenichi Nakata, Shimpei Sakoda, Yukihiro Yamamoto, Shinji Ichikawa, Tetshuhiro Ishikawa
  • Publication number: 20120043903
    Abstract: An electronic ballast for driving a gas discharge lamp comprises an inverter circuit, a resonant tank circuit, and a control circuit operable to determine an approximation of a resonant frequency of the resonant tank circuit and to control the inverter circuit in response to the approximation of the resonant frequency. The control circuit determines the approximation of the resonant frequency by adjusting an operating frequency of a high-frequency inverter output voltage provided to the resonant tank circuit from a frequency above the resonant frequency down towards the resonant frequency, measuring the magnitude of a lamp voltage across the lamp, and storing the present value of the operating frequency as the resonant frequency when the magnitude of the lamp voltage reaches a maximum value. The control circuit may control the operating frequency of the inverter output voltage in response to the approximation of the resonant frequency and a target intensity of the lamp.
    Type: Application
    Filed: August 18, 2010
    Publication date: February 23, 2012
    Applicant: LUTRON ELECTRONICS CO., INC.
    Inventors: Jonathan Robert Quayle, Venkatesh Chitta
  • Patent number: 8072227
    Abstract: Provided is a material for tactile sensor, which is easy to be formed, and in which the shape, size and orientation of coils dispersed in the medium are sufficiently controlled. The tactile-sensitive material includes a medium and a plurality of micro coils dispersed in the medium and constituting a LCR resonance circuit, and wherein each of the plurality of micro coils includes at least one spiral coil portion, and coil axes of the plurality of micro coils are aligned along at least one direction or directed in at least one plane. When a tactile stress is applied to the tactile-sensitive material, the C component is varied significantly, which contributes to the improvement in sensitivity of the tactile sensor. Further, by providing a core at the coil center, the sensitivity is more improved.
    Type: Grant
    Filed: November 17, 2010
    Date of Patent: December 6, 2011
    Assignee: TDK Corporation
    Inventor: Koji Shimazawa
  • Publication number: 20110260739
    Abstract: The present invention relates to a method and a system for on-site and full-scale testing of wind turbine plants. In particular, the present invention relates to a method and a system applying resonance circuits tuned with the fundamental frequency, or harmonics thereof, of a power supply grid connected to a wind turbine plant to be tested. The wind turbine plant to be tested may remain connected to the power supply grid during on-site and full-scale testing.
    Type: Application
    Filed: December 16, 2009
    Publication date: October 27, 2011
    Applicant: Vestas Wind Systems A/S
    Inventors: Jorge Martinez Garcia, Philip Carne Kjaer, Peter Nielsen
  • Patent number: 8044670
    Abstract: An apparatus for determining a resonant frequency of a wind turbine tower is provided. The apparatus includes a processing unit configured to receive an acceleration measurement value, the acceleration measurement value representative of the acceleration of the wind turbine tower in the direction parallel to a rotor rotational axis of the wind turbine and/or in the direction perpendicular to both the rotor rotational axis and the tower axis of the wind turbine. The apparatus includes a memory configured to store a series of acceleration measurement values, and the processing unit includes a Fourier transform module configured to calculate a spectral vector based on calculating a convolution-based fast Fourier transform of the series of acceleration measurement values, and includes a resonant frequency calculation module configured to calculate the tower resonant frequency based on the calculated spectral vector.
    Type: Grant
    Filed: March 12, 2009
    Date of Patent: October 25, 2011
    Assignee: Siemens Aktiengesellschaft
    Inventors: Martin Bjerge, Per Egedal
  • Publication number: 20110248727
    Abstract: A method is disclosed for compensation of system tolerances in an inductive coupler which includes a power generator that feeds an alternating current into a series resonance circuit formed by a resonance capacitor and an inductive rotating transmission device. First, a brief sequence of at least one period of an alternating current is fed by the power generator into the series resonance circuit. Then the series resonance circuit is short-circuited. A first resonance frequency is measured. Then a longer sequence having a plurality of periods of an alternating-current voltage is generated by the power generator, so that a given small voltage is built up at the load. Now a second resonance frequency is measured whilst the resonance circuit is short-circuited. Then at least one correcting variable for the power generator is determined from the two resonance frequencies.
    Type: Application
    Filed: March 10, 2011
    Publication date: October 13, 2011
    Applicant: SCHLEIFRING UND APPARATEBAU GMBH
    Inventors: Nils Krumme, Arno Zimpfer, Stefan Fischer
  • Publication number: 20110193569
    Abstract: An oscillator circuit includes a phase-locked loop, a crystal resonator, first and second capacitors, and first and second impedance elements. The phase-locked loop is coupled between a first node and a second node. The crystal resonator is also coupled between the first node and the second node. The first capacitor is coupled between the first node and ground, and the second capacitor is coupled between the second node and ground. The first impedance element is coupled in a first circuit path from the first node to ground through the first capacitor. The second impedance element is coupled in a second circuit path from the second node to ground through the second capacitor.
    Type: Application
    Filed: February 11, 2011
    Publication date: August 11, 2011
    Applicant: LANDIS+GYR, INC.
    Inventor: Saieb AlRawi
  • Patent number: 7952365
    Abstract: A plurality of through-hole vias connected to conductor layers is disposed with gaps left between these vias around opening parts disposed in the conductor layers in a printed board in which these conductor layers are disposed parallel to each other so as to sandwich a dielectric layer in between. Furthermore, through-hole vias used for excitation are disposed in the opening parts of the conductor layers and regions of the dielectric layer matching these opening parts in a non-contact manner with the conductor layers. When the complex dielectric constant is measured, a high-frequency power is applied to the through-hole vias, and the power loss between the through-hole vias and the conductor layers is measured by the S parameter method.
    Type: Grant
    Filed: March 22, 2006
    Date of Patent: May 31, 2011
    Assignee: NEC Corporation
    Inventors: Kaoru Narita, Taras Kushta
  • Patent number: 7932514
    Abstract: A method for determining whether a quantum system comprising a superconducting qubit is occupying a first basis state or a second basis state once a measurement is performed is provided. The method, comprising: applying a signal having a frequency through a transmission line coupled to the superconducting qubit characterized by two distinct, separate, and stable states of differing resonance frequencies each corresponding to the occupation of the first or second basis state prior to measurement; and measuring at least one of an output power or phase at an output port of the transmission line, wherein the measured output power or phase is indicative of whether the superconducting qubit is occupying the first basis state or the second basis state.
    Type: Grant
    Filed: May 23, 2008
    Date of Patent: April 26, 2011
    Assignee: International Business Machines Corporation
    Inventors: Matthew J. Farinelli, George A. Keefe, Shwetank Kumar, Matthias Steffen
  • Publication number: 20110062967
    Abstract: Disclosed is a very low frequency test generator for generating a high voltage having a low frequency in order to test the insulation of capacitive loads, in particular power cables. Said VLF test generator comprises two oscillators, the frequencies of which differ from one another by twice said low frequency, a resonance circuit which is fed in an interfering manner by the oscillators, is adjusted to the oscillator frequencies and causes a voltage rise of the interfering oscillator frequencies, and a demodulator for disconnecting the low-frequency high voltage generated by the interference from the resonance circuit and applying the same to the load.
    Type: Application
    Filed: May 20, 2009
    Publication date: March 17, 2011
    Applicant: MOHAUPT HIGH VOLTAGE GMBH
    Inventor: Peter Mohaupt
  • Publication number: 20110018555
    Abstract: The invention relates to an electrical measuring device for performing an electrical impedance measurement in a contactless manner. The measuring device comprises a measuring unit which is provided with the impedance to be measured and a passive resonance circuit connected thereto for generating a measuring signal to be wirelessly received by a separate active transmitting and receiving unit for determination of the electrical impedance, upon wireless reception of an interrogation signal transmitted by the active transmitting and receiving unit. Further, the measuring unit is provided with an additional reference circuit which is preferably connected to the resonance circuit for, depending upon the interrogation signal, generating a reference signal to be received by the active transmitting and receiving unit.
    Type: Application
    Filed: January 2, 2008
    Publication date: January 27, 2011
    Applicant: Technische Universiteit Delft
    Inventors: Gerardus Cornelis Maria Meijer, Maximus Andreas Hilhorst
  • Patent number: 7868628
    Abstract: Provided is a material for tactile sensor, which is easy to be formed, and in which the shape, size and orientation of coils dispersed in the medium are sufficiently controlled. The tactile-sensitive material comprises a medium and a plurality of micro coils dispersed in the medium and constituting a LCR resonance circuit, and wherein each of the plurality of micro coils comprises at least one spiral coil portion, and coil axes of the plurality of micro coils are aligned along at least one direction and/or directed in at least one plane. When a tactile stress is applied to the tactile-sensitive material, the C component is varied significantly, which contributes to the improvement in sensitivity of the tactile sensor. Further, by providing a core at the coil center, the sensitivity is more improved.
    Type: Grant
    Filed: August 16, 2007
    Date of Patent: January 11, 2011
    Assignee: TDK Corporation
    Inventor: Koji Shimazawa
  • Publication number: 20100297687
    Abstract: A change in impedance of a electromechanical resonating sensor is utilized to detect and/or measure a change in mass accumulated on the sensor. The impedance is monitored at a fixed frequency. The fixed frequency may be at or near the resonance frequency of the sensor. In various configurations, the sensor comprises a quartz crystal microbalance sensor or a piezoelectric cantilever sensor.
    Type: Application
    Filed: May 19, 2010
    Publication date: November 25, 2010
    Applicant: DREXEL UNIVERSITY
    Inventors: Rajakkannu Mutharasan, Sen Xu, Blake N. Johnson, Harsh Sharma, Ramji S. Lakshmanan
  • Publication number: 20100225332
    Abstract: A proximity sensor has an oscillation circuit, an amplitude measurement circuit, a control circuit and a signal processing circuit. The oscillation circuit has an LC resonant circuit and an oscillation control circuit that is configured to supply an electric current to the LC resonant circuit to generate oscillating voltage across the LC resonant circuit. The amplitude measurement circuit is configured to produce an amplitude signal corresponding to the amplitude of the oscillating voltage. The control circuit is configured to set the negative conductance of the oscillation control circuit to a critical value by which the LC resonant circuit can oscillate based on the amplitude signal. The signal processing circuit is configured to produce a distance signal corresponding to the distance between an object and the sensing coil based on a parameter associated with the negative conductance.
    Type: Application
    Filed: September 19, 2008
    Publication date: September 9, 2010
    Inventors: Masahisa Niwa, Kunitaka Okada, Fumihiro Kasano, Sukoya Tawaratsumida
  • Patent number: 7768276
    Abstract: Systems and methods for identifying problems with PZT elements of micro-actuators are provided. In certain example embodiments, a voltage (e.g., a sine voltage) may be applied to a reference unit causing it as well as a test unit to vibrate. Characteristics of the respective resonances (e.g., frequency, amplitude, phase, etc.) may be compared (e.g., by a processor) to determine whether there are problems with the test unit. The reference unit may include an HGA or an HSA of a hard disk drive device. The test unit may include corresponding parts for inspection. Such techniques make it possible to detect problems with PZT elements when there is only one PZT element per micro-actuator.
    Type: Grant
    Filed: November 6, 2006
    Date of Patent: August 3, 2010
    Assignee: Sae Magnetics (H. K.) Ltd.
    Inventor: MingGao Yao
  • Patent number: 7721397
    Abstract: A capacitive ultrasonic transducer includes a flexible layer, a first conductive layer on the flexible layer, a support frame on the first conductive layer, the support frame including a flexible material, a membrane over the support frame being spaced apart from the first conductive layer by the support frame, the membrane including the flexible material, a cavity defined by the first conductive layer, the support frame and the membrane, and a second conductive layer on the membrane.
    Type: Grant
    Filed: February 7, 2007
    Date of Patent: May 25, 2010
    Assignee: Industrial Technology Research Institute
    Inventors: Ming-Wei Chang, Tse-Min Deng, Te-I Chiu, Mu-Yue Chen, Da-Chen Pang, Ping-Ta Tai
  • Patent number: 7671606
    Abstract: A technique is disclosed for determining capacitive, inductive, and resistive components of power line impedance via a portable line impedance measurement system. The measurement system includes a circuit that switches a burden resistor between power line conductors to cause a droop in a voltage waveform. The voltage waveform is sampled prior to inclusion of the resistor in the circuit, as well as after to identify the droop. The short circuit between the power lines is then removed by opening the circuit and a first effective capacitance in the test circuitry causes a resonant ring due to the inductive component of the power line impedance. The process is repeated a second time with a second effective load capacitance enabled in the test circuitry to cause a second resonant ring. Based upon the frequency of the rings and the voltage measurements, the individual impedance components of power line impedance can be computed.
    Type: Grant
    Filed: April 30, 2007
    Date of Patent: March 2, 2010
    Assignee: Rockwell Automation Technologies, Inc.
    Inventor: Michael L. Gasperi
  • Publication number: 20100019778
    Abstract: Wireless sensors configured to record and transmit data as well as sense and, optionally, actuate to monitor physical properties of an environment and, optionally, effect changes within that environment. In one aspect, the wireless sensor can have a power harvesting unit; a voltage regulation unit, a transducing oscillator unit, and a transmitting coil. The voltage regulation unit is electrically coupled to the power harvesting unit and is configured to actuate at a minimum voltage level. The transducing oscillator unit is electrically coupled to the voltage regulation unit and is configured to convert a sensed physical property into an electrical signal. Also, the transmitting coil is configured to receive the electrical signal and to transmit the electrical signal to an external antenna.
    Type: Application
    Filed: July 20, 2009
    Publication date: January 28, 2010
    Inventors: Jin Woo Park, Florent Cros, Mark G. Allen
  • Publication number: 20090326702
    Abstract: Methods and computer storage media provide for the installation of potted inserts and installation validation. According to embodiments described herein, an insert is placed within an insert aperture of a panel or other structure. Potting compound is injected into a potting cavity surrounding the insert through a fill hole in the insert until potting compound overflows from another fill hole. The installation is validated by applying a force to the installed insert at a determined frequency using a mechanical impedance instrument and measuring a response frequency. The response frequency is compared to an acceptable frequency range to determine whether the insert is properly installed.
    Type: Application
    Filed: June 13, 2008
    Publication date: December 31, 2009
    Inventors: Michael P. Kuntz, Mark L. Younie, Gary E. Georgeson
  • Publication number: 20090289638
    Abstract: A method for determining whether a quantum system comprising a superconducting qubit is occupying a first basis state or a second basis state once a measurement is performed is provided. The method, comprising: applying a signal having a frequency through a transmission line coupled to the superconducting qubit characterized by two distinct, separate, and stable states of differing resonance frequencies each corresponding to the occupation of the first or second basis state prior to measurement; and measuring at least one of an output power or phase at an output port of the transmission line, wherein the measured output power or phase is indicative of whether the superconducting qubit is occupying the first basis state or the second basis state.
    Type: Application
    Filed: May 23, 2008
    Publication date: November 26, 2009
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Matthew J. Farinelli, George A. Keefe, Shwetank Kumar, Matthias Steffen