By Capacitance Measuring Patents (Class 324/519)
  • Patent number: 10466297
    Abstract: An integrated circuit detection method, apparatus, and system are disclosed, which relate to the field of electronics and resolve a problem of detecting an electrical parameter of an integrated circuit on a printed circuit board in a power-on state. A specific solution is as follows: N detection circuits (101) are disposed, where each detection circuit (101) is connected to a different integrated circuit (102), the detection circuit (101) is provided with a first detection point (a) and a second detection point (b), and the detection circuit (101) is configured to detect the electrical parameter of the integrated circuit (102) that is connected to the detection circuit (101); and N is an integer greater than or equal to 1. The solution is used in a process of detecting the electrical parameter of the integrated circuit on the printed circuit board.
    Type: Grant
    Filed: July 28, 2017
    Date of Patent: November 5, 2019
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Jianping Deng, Cheng Zeng, Qingsong Zhu
  • Patent number: 10355425
    Abstract: The disclosure proposes a cable for connecting to an electronic device. The cable comprising an electrical cord, a connector, a sensor device and an alarm unit. The connector is connected to one end of the electrical cord, and adapted to connect the cable to the electronic device. The sensor device is arranged at the connector and is adapted for collecting sensor data from the electronic device when the connector is connected to the electronic device. The alarm unit is connected to the sensor device and arranged to initiate an alarm based on output data from the sensor device.
    Type: Grant
    Filed: April 7, 2017
    Date of Patent: July 16, 2019
    Assignee: SCUDI AB
    Inventor: Mattias Gustafsson
  • Patent number: 10338552
    Abstract: A simulation apparatus for simulating a peripheral circuit arrangement connected to a regulating device and has a first current controller for influencing a first load current and a second current controller for influencing a first source current. The first current controller is controlled by a model code and used to set the first load current, and the first load current is routed to a first load connection of the regulating device. The second current controller is controlled by the model code and used to set the first source current, which is routed to a first supply connection of the regulating device. The model code influences the model code on the first current controller and the second current controller allows the first load current to be recovered at least proportionally from the first source current and/or the first source current to be recovered at least proportionally from the first load current.
    Type: Grant
    Filed: February 15, 2017
    Date of Patent: July 2, 2019
    Assignee: dSPACE digital signal processing and control engineering GmbH
    Inventor: Joerg Bracker
  • Patent number: 10215874
    Abstract: A capacitive detection and display device and method is used to simultaneously detect and display an image of an object hidden behind an obscuring surface. An electrode applies an electric field to a chamber having a visual display material which is located between the electrode and the obscuring surface. A sensitivity enhancement device is located within the electric field between the chamber and the obscuring surface to increase the sensitivity of the detection and display device and increase its depth of penetration through the obscuring surface. In one embodiment, the sensitivity device comprises an array of sensitivity electrodes formed on a nonconductive substrate. The shape of a hidden object is visually displayed by the visual display material.
    Type: Grant
    Filed: February 24, 2018
    Date of Patent: February 26, 2019
    Inventor: Lanny Starkes Smoot
  • Patent number: 10203828
    Abstract: A low cost, two-dimensional, fingerprint sensor includes a pixel array, each pixel including a switch and a pixel electrode for forming a capacitance with a fingertip. One or more active transmission electrodes are spaced from a selected row of the pixel array, and transmit a carrier signal into the finger without direct coupling into the selected pixels. Signals sensed by the pixel array are coupled to an independent integrated circuit, and connections between the IC and the pixel array are reduced by demultiplexing row select lines, and by multiplexing sensed column data. Differential sensing may be used to improve common mode noise rejection. The fingerprint sensor may be conveniently incorporated within a conventional touchpad LCD panel, and can mimic the performance of lower density touchpad pixels.
    Type: Grant
    Filed: August 11, 2017
    Date of Patent: February 12, 2019
    Assignee: EGIS TECHNOLOGY INC.
    Inventors: Richard B. Nelson, Richard A. Erhart
  • Patent number: 10203816
    Abstract: A low cost, two-dimensional, fingerprint sensor includes a pixel array, each pixel including a switch and a pixel electrode for forming a capacitance with a fingertip. One or more active transmission electrodes are spaced from a selected row of the pixel array, and transmit a carrier signal into the finger without direct coupling into the selected pixels. Signals sensed by the pixel array are coupled to an independent integrated circuit, and connections between the IC and the pixel array are reduced by demultiplexing row select lines, and by multiplexing sensed column data. Differential sensing may be used to improve common mode noise rejection. The fingerprint sensor may be conveniently incorporated within a conventional touchpad LCD panel, and can mimic the performance of lower density touchpad pixels.
    Type: Grant
    Filed: April 3, 2014
    Date of Patent: February 12, 2019
    Assignee: EGIS TECHNOLOGY INC.
    Inventors: Richard B. Nelson, Richard A. Erhart
  • Patent number: 10203827
    Abstract: A low cost, two-dimensional, fingerprint sensor includes a pixel array, each pixel including a switch and a pixel electrode for forming a capacitance with a fingertip. One or more active transmission electrodes are spaced from a selected row of the pixel array, and transmit a carrier signal into the finger without direct coupling into the selected pixels. Signals sensed by the pixel array are coupled to an independent integrated circuit, and connections between the IC and the pixel array are reduced by demultiplexing row select lines, and by multiplexing sensed column data. Differential sensing may be used to improve common mode noise rejection. The fingerprint sensor may be conveniently incorporated within a conventional touchpad LCD panel, and can mimic the performance of lower density touchpad pixels.
    Type: Grant
    Filed: July 18, 2017
    Date of Patent: February 12, 2019
    Assignee: EGIS TECHNOLOGY INC.
    Inventors: Richard B. Nelson, Richard A. Erhart
  • Patent number: 10203826
    Abstract: A low cost, two-dimensional, fingerprint sensor includes a pixel array, each pixel including a switch and a pixel electrode for forming a capacitance with a fingertip. One or more active transmission electrodes are spaced from a selected row of the pixel array, and transmit a carrier signal into the finger without direct coupling into the selected pixels. Signals sensed by the pixel array are coupled to an independent integrated circuit, and connections between the IC and the pixel array are reduced by demultiplexing row select lines, and by multiplexing sensed column data. Differential sensing may be used to improve common mode noise rejection. The fingerprint sensor may be conveniently incorporated within a conventional touchpad LCD panel, and can mimic the performance of lower density touchpad pixels.
    Type: Grant
    Filed: July 18, 2017
    Date of Patent: February 12, 2019
    Assignee: EGIS TECHNOLOGY INC.
    Inventors: Richard B. Nelson, Richard A. Erhart
  • Patent number: 10175284
    Abstract: In a circuit board testing apparatus for performing a four-terminal measurement method on a wiring pattern formed of a plurality of wires on a circuit board, a control part connects in series contact probes to be connected to upstream-side voltage detection terminals or downstream-side voltage detection terminals, via connection terminals, allows a power supply part to apply power between the test points with which the contact probes connected in series are in contact, allows a voltage detection part to detect a voltage between the test points, and makes a determination as to conductive contact states of the contact probes with the test points, based on the detected voltage.
    Type: Grant
    Filed: October 7, 2015
    Date of Patent: January 8, 2019
    Assignee: NIDEC-READ CORPORATION
    Inventor: Munehiro Yamashita
  • Patent number: 10153593
    Abstract: A capacitive coupling system includes a plurality of conductive pads situated on a dielectric layer. A plurality of switches are connected between pairs of the conductive pads via conductive linkages. The switches are operable to selectively connect selected pairs of the conductive pads to selectively adjust capacitances between conductor pairs of an electrical connector.
    Type: Grant
    Filed: August 14, 2017
    Date of Patent: December 11, 2018
    Assignee: CommScope Technologies LLC
    Inventors: Joseph C. Coffey, Christine Anne Dooley
  • Patent number: 10109424
    Abstract: The present invention relates to a multi-layer capacitor. The multi-layer capacitor of the present invention includes a main body formed by alternately stacking a plurality of dielectric layers and a plurality of inner electrode layers, in which all the plurality of dielectric layers are poled in a same direction; a cover layer for covering and protecting the main body from outside; and outer electrodes electrically connected to the inner electrode layers to apply voltage to the inner electrode layers. Since deformation is offset overall in the multi-layer capacitor of the present invention, the piezoelectric effect occurs in an opposite direction in each of adjacent dielectric layers due to the poling process, and thus the present invention has an effect of reducing vibration and noise.
    Type: Grant
    Filed: April 21, 2015
    Date of Patent: October 23, 2018
    Assignee: INDUSTRY-ACADEMIC COOPERATION FOUNDATION YONSEI UNIVERSITY
    Inventors: No Cheol Park, Byung Han Ko, Kyoung Su Park, Sang Geuk Jeong
  • Patent number: 10078775
    Abstract: A sensor has parallel upper pickup lines in an upper conductive layer, parallel lower pickup lines in a lower conductive layer, parallel drive lines oriented transversely to the upper and lower pickup lines in a middle conductive layer, a first insulating layer separating the upper pickup lines from the drive lines, and a second insulating layer opposite the first insulating layer and separating the lower pickup lines from the drive lines. Upper electrode pairs are defined at locations where an upper pickup electrode crosses a drive line, and each upper electrode pair has an impedance that is sensitive to a first object contacting or in close proximity to the upper electrode pair. Lower electrode pairs are defined at locations where a lower pickup line crosses a drive line, and each lower electrode pair has an impedance that is sensitive to a second object contacting or in close proximity to the lower electrode pair.
    Type: Grant
    Filed: June 22, 2016
    Date of Patent: September 18, 2018
    Assignee: IDEX ASA
    Inventor: Fred G. Benkley, III
  • Patent number: 10048307
    Abstract: A method and system for performing electrical tests on complex devices. The method comprises: a first stage that includes generating a model of the device in a digital electronic circuits description language based on stimuli transfer, preparing a stimulus vector and simulating the model with the stimulus vector for obtaining the continuity and insulation test program to be performed to the device; a second stage where the device is connected to a workbench formed by an electrical testing machine and a matrix switch via a connection interface; and a third stage where the test program on the device is executed. The system comprises the workbench and a computer system with software adapted to execute the method.
    Type: Grant
    Filed: December 10, 2015
    Date of Patent: August 14, 2018
    Assignee: AIRBUS DEFENCE AND SPACE S.A.
    Inventors: Josef Ignacio Hotz Ordono, Alberto Martinez Perez, Agustin Mendez Delgado, Juan Manuel Mogollon, Elisa Jimenez Luengo
  • Patent number: 9964576
    Abstract: A capacitance detection circuit detects changes in the capacitance of a variable capacitor by using the change in capacitance to change the resonant frequency of a variable capacitor oscillator. The resonant frequency of the variable capacitor oscillator is converted from the time domain to the frequency domain, and then selected frequencies values are compared to known frequency domain values to detect the magnitude of the change in capacitance.
    Type: Grant
    Filed: October 6, 2014
    Date of Patent: May 8, 2018
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Peyman Hojabri, Charles Yong Yi Guan
  • Patent number: 9897641
    Abstract: A method for real-time monitoring of an operational state of a capacitive sensor capable of being mounted on a rotating machine, and connected to an electronic measuring module via a high frequency transmission line. The method includes generating, within the electronic module, a signal for compensating in capacitance parasitic effects from the transmission line and the sensor, generating, within the electronic module, a signal for compensating in conductance parasitic effects from the transmission line and the sensor, extracting a signal representative of the capacitance compensation and of a signal representative of the conductance compensation so as to determine an operating point of the sensor and analyzing the operating point so as to check if it is located in a predetermined area.
    Type: Grant
    Filed: June 10, 2015
    Date of Patent: February 20, 2018
    Assignee: FOGALE NANOTECH
    Inventors: Christian Neel, Nicolas Billiard
  • Patent number: 9835681
    Abstract: A probe card for testing electrical properties of a device under test (DUT) includes a plurality of semiconductor devices, which includes a substrate; and at least one transmission antenna, which is implemented as a chip on film (COF) type and attached to the substrate, wirelessly transmitting at least one of electric power and data to each of the plurality of semiconductor devices.
    Type: Grant
    Filed: December 18, 2014
    Date of Patent: December 5, 2017
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Kyoung-hoon Jeon, Yo-jong Kim, Kyu-jeong Lee, Il-kyo Jeong
  • Patent number: 9828950
    Abstract: A positive crankcase ventilation (PCV) system for an engine includes: a PCV tube defining a flowpath extending along an axis; a damage detection circuit associated with the PCV tube. The PCV system also includes a damage detection module that selectively indicates that a fault is present in the PCV tube based on a change in a characteristic of the damage detection circuit and that illuminates a malfunction indicator lamp (MIL) when the fault is present.
    Type: Grant
    Filed: September 25, 2015
    Date of Patent: November 28, 2017
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventor: Marie-Christine G. Jones
  • Patent number: 9801329
    Abstract: An on-the-go monitor and control means and method for an agriculture machines includes on-the-go soil sensors that can be used to control tillage and seeding depth. On seeder implements, the sensors provide information that affects uniform plant emergence.
    Type: Grant
    Filed: August 5, 2015
    Date of Patent: October 31, 2017
    Assignee: Ag Leader Technology
    Inventor: Roger R. Zielke
  • Patent number: 9784555
    Abstract: An example process for determining electrical path lengths includes: injecting current into a transmission line having a known capacitance per unit of length; determining a rate of change in voltage on the transmission line in response to the current; determining a capacitance of the transmission line based on the change in voltage; and determining an electrical path length of the transmission line based on the determined capacitance of the transmission line and the known capacitance per unit of length.
    Type: Grant
    Filed: November 25, 2015
    Date of Patent: October 10, 2017
    Assignee: Teradyne, Inc.
    Inventor: Marc Spehlmann
  • Patent number: 9778314
    Abstract: A probe assembly for capacitive testing electrical connections of a low profile component to a circuit assembly. The probe assembly is configured to reduce coupling of noise signals from the circuit assembly to the capacitive probe. The probe assembly includes a sensing member with a geometry that allows the probe to preferentially couple to test signals from the pins of a component under test rather than conductive structures on the circuit assembly, such as pads, and signal traces to which those pins are attached. The sensing member may be a vertical capacitive sense plate such that coupling is to an edge of the plate. The sensing member alternatively may be a horizontal capacitive sense plate with an active area of the probe surrounded by an isolation ring. Measurements made with such capacitive probes may provide test measurements that yield a reliable discrimination between a properly attached pin and an open pin.
    Type: Grant
    Filed: August 25, 2014
    Date of Patent: October 3, 2017
    Assignee: Teradyne, Inc.
    Inventor: Anthony J. Suto
  • Patent number: 9766053
    Abstract: A system and method for determining a change in a thickness and temperature of a surface of a material are disclosed herein. The system and the method are usable in a thermal protection system of a space vehicle, such as an aeroshell of a space vehicle. The system and method may incorporate micro electric sensors arranged in a ladder network and capacitor strip sensors. Corrosion or ablation causes a change in an electrical property of the sensors. An amount of or rate of the corrosion or the ablation and a temperature of the material is determined based on the change of the electrical property of the sensors.
    Type: Grant
    Filed: November 21, 2011
    Date of Patent: September 19, 2017
    Assignee: The United States of America as Represented by the Administrator of NASA
    Inventor: Robert Okojie
  • Patent number: 9739816
    Abstract: The present disclosure describes a differential shield capacitive sensor design. The sensor design uses a differential measurement to measure capacitance and a pair of traces are used to differentially reject the response of the sensor traces and balance any parasitic capacitances. In some embodiments, the sensor design includes a differential sensor design on a bottom side of a flex circuit to differentially balance the environment and reject noise coupling to the sensor. The top side of the flex circuit can include a single ended design for proper environment sensing. The spatial arrangement and size of the sensors may vary depending on the application.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: August 22, 2017
    Assignee: ANALOG DEVICES, INC.
    Inventor: Adrian Anthony Flanagan
  • Patent number: 9735509
    Abstract: A capacitive coupling system includes a plurality of conductive pads situated on a dielectric layer. A plurality of switches are connected between pairs of the conductive pads via conductive linkages. The switches are operable to selectively connect selected pairs of the conductive pads to selectively adjust capacitances between conductor pairs of an electrical connector.
    Type: Grant
    Filed: July 14, 2015
    Date of Patent: August 15, 2017
    Assignee: CommScope Technologies LLC
    Inventors: Joseph C. Coffey, Christine Anne Dooley
  • Patent number: 9714973
    Abstract: A microelectronic short circuit detection module is disclosed that locates and distinguishes among different types of short circuits in touch screen panels. Individual short circuit detection circuits are coupled to force and sense lines throughout a wire matrix within the touch screen. If the line is shorted to a neighboring line or any other line carrying an opposite logic state, its logic state will be corrupted by the short and will be held at a value opposite that of the intended input signal. Comparing the input and the output therefore provides an indicator of a short circuit to another force or sense line in the wire matrix. A pair of pull up/down stages is engaged to detect whether the short is coupled to power or ground. A threshold resistor can be varied to adjust detection sensitivity. By conducting a serial test, matrix coordinates of the short circuit can be identified.
    Type: Grant
    Filed: November 21, 2014
    Date of Patent: July 25, 2017
    Assignee: STMicroelectronics Asia Pacific Pte Ltd
    Inventors: Dianbo Guo, EngJye Ng, Abhishek Singh
  • Patent number: 9671457
    Abstract: A method comprises connecting a testing setup having a plurality of probes to a device under test having a plurality of vias, wherein a probe is aligned with a corresponding via of the device under test and conducting a plurality of via electrical characteristic tests through a conductive path comprising the vias, the probes and a plurality of conductive devices, each of which connects two adjacent probes, wherein the conductive devices are in the testing setup.
    Type: Grant
    Filed: December 5, 2014
    Date of Patent: June 6, 2017
    Assignee: Taiwan Semiconductor Manufacturing Company, Ltd.
    Inventors: Mill-Jer Wang, Chih-Chia Chen, Hung-Chih Lin, Ching-Nen Peng, Hao Chen
  • Patent number: 9385709
    Abstract: A capacitive distance sensor is provided having an elongated sensor element. The sensor element comprises a cylindrical carrier body, which is made of an electrically non-conductive material and has a round cross-sectional areas, and a sensor area which substantially surrounds the carrier body in the manner of a sheath and is made of an electrically conductive material.
    Type: Grant
    Filed: February 21, 2013
    Date of Patent: July 5, 2016
    Assignee: Brose Fahrzeugteile GmbH & Co. KG Hallstadt
    Inventors: Holger Wuerstlein, Thorsten Kuhnen
  • Patent number: 9244117
    Abstract: Systems and methods which utilize spread spectrum sensing on live circuits to obtain information regarding a circuit under test are provided. In some embodiments S/SSTDR testing may be utilized to obtain R, L, C and Z measurements from circuit components. In yet further embodiments, these measurements may be utilized to monitor the output of sensors on a circuit.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: January 26, 2016
    Assignee: LiveWire Innovation, Inc.
    Inventors: Cynthia Furse, Faisal Khan
  • Patent number: 8975902
    Abstract: Various embodiments provide systems and methods for controlling sub-system components during power disturbance events. More particularly, various embodiments provide systems and methods for preventing a controller (215) within a sub-system from turning OFF a switching device (220) during power disturbance events related to other sub-systems.
    Type: Grant
    Filed: December 9, 2008
    Date of Patent: March 10, 2015
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: Samuel M. Babb
  • Patent number: 8975899
    Abstract: An inverter device for feeding electrical energy from a DC-power source into a power grid includes a pair of bus lines to be connected to the DC-power source; a plurality of capacitors connected in series between the bus lines; a surveying topology surveying an integrity of the plurality of capacitors, and to provide a signal indicating a loss of integrity of one capacitor of the plurality of capacitors; a voltmeter measuring a voltage drop over the plurality of capacitors; a DC/AC-inverter; and a controller. in case of the signal indicating a loss of integrity of one capacitor of the plurality of capacitors, the controller compares the voltage drop over the plurality of capacitors to a lost integrity threshold voltage value, and reduces a current load to the plurality of capacitors by reducing the power uptake of the DC/AC-inverter, when the voltage drop exceeds the lost integrity threshold voltage value.
    Type: Grant
    Filed: July 13, 2012
    Date of Patent: March 10, 2015
    Assignee: SMA Solar Technology AG
    Inventors: Henrik Wolf, Thomas Wegener, Daniel Clemens, Harald Drangmeister
  • Patent number: 8970237
    Abstract: A system and method for low-cost, fault tolerant, EMI robust data communications, particularly for an EV environment.
    Type: Grant
    Filed: August 12, 2012
    Date of Patent: March 3, 2015
    Assignee: Tesla Motors, Inc.
    Inventors: Nathaniel Brian Martin, Ian Casimir Dimen, Samuel Douglas Crowder
  • Patent number: 8912802
    Abstract: In a component-embedded circuit substrate having a plurality of capacitors embedded therein, the capacitors are connected in parallel, inspection electrodes are formed, and the inspection electrodes connect to respective terminal electrodes of the capacitor through via conductors. At the terminal electrodes of the capacitor, the connection position of the via conductors for connecting the inspection electrodes differs from the connection position of via conductors for connecting respective terminal electrodes of the capacitor.
    Type: Grant
    Filed: March 17, 2014
    Date of Patent: December 16, 2014
    Assignee: Taiyo Yuden Co., Ltd.
    Inventors: Shigeo Sakurai, Tetsuo Saji
  • Patent number: 8912801
    Abstract: A method for detecting an internal failure in a capacitor bank connected to a power system, wherein the capacitor bank includes a plurality of capacitor units that are divided into two Y sections. Each phase in each of the Y sections defines a leg and each leg includes series and/or parallel-connected capacitor units. The internal failure may occur in one or more capacitor elements or units or involve one or more legs. The method includes measuring the phase current in one of the phases, calculating the root mean square value, denoted by RMS, of the measured phase currents, measuring the unbalanced current between the two sections, calculating the RMS value of the measured unbalanced currents, and detecting the phase angle between the measured phase current and the measured unbalanced current.
    Type: Grant
    Filed: August 14, 2013
    Date of Patent: December 16, 2014
    Assignee: ABB Research Ltd.
    Inventors: Zoran Gajic, Mustafa Ibrahim, Jianping Wang
  • Patent number: 8896325
    Abstract: A capacitance sensing circuit comprises a capacitive device having a capacitance, the device initially being at a first voltage level. The capacitance sensing circuit is capable of applying one or more pull-up currents to the device during one or more corresponding pull-up periods of time, for changing the first voltage level into one or more corresponding pull-up voltage levels; applying a measurement current to the device; and measuring a measurement period of time, during which one of the pull-up voltage levels changes into a second voltage level. A method of sensing a capacitance of a capacitive device comprises applying a first voltage to the device; applying one or more pull-up currents during corresponding pull-up times, for changing the first voltage into corresponding pull-up voltages; applying a measurement current; and measuring a time, during which one pull-up voltage changes into a second voltage.
    Type: Grant
    Filed: January 19, 2009
    Date of Patent: November 25, 2014
    Assignee: Freescale Semiconductor, Inc.
    Inventor: Libor Gecnuk
  • Patent number: 8896317
    Abstract: A method of determining the dominant output wavelength of an LED, includes determining an electrical characteristic of the LED which is dependent on the voltage-capacitance characteristics, and analyzing the characteristic to determine the dominant output wavelength.
    Type: Grant
    Filed: February 9, 2009
    Date of Patent: November 25, 2014
    Assignee: NXP B.V.
    Inventors: Radu Surdeanu, Viet Nguyen Hoang, Benoit Bataillou, Pascal Bancken, David Van Steenwinckel
  • Patent number: 8878552
    Abstract: A system includes a capacitor, a plurality of notification devices connected in parallel with the capacitor, and a controller. The controller is capable of determining capacitance of the capacitor during charge-up of the capacitor, and the controller is capable of determining the wiring impedance of the emergency notification circuit during discharge of the capacitor.
    Type: Grant
    Filed: December 12, 2011
    Date of Patent: November 4, 2014
    Assignee: UTC Fire and Security Americas Corp., Inc.
    Inventors: Andres Cordoba Galera, William Edwards, Joseph Peter Calinski, Donald Becker, Antonio Gonzalez Requejo, Miguel Angel Perez Gandara
  • Patent number: 8866499
    Abstract: A system and method for testing capacitance of a load circuit connected to an output pin of a driving circuit In one embodiment, the method may comprise driving a voltage at the output pin to a first voltage; a predetermined current to the output pin; comparing the voltage at the output pin to a reference voltage; and when the voltage at the output pin matches the reference voltage, generating an estimate of capacitance present at the output pin based on a number of clock cycles occurring between an onset of a timed voltage change period and a time at which the voltage at the output pin matches the reference voltage.
    Type: Grant
    Filed: August 27, 2009
    Date of Patent: October 21, 2014
    Assignee: Analog Devices, Inc.
    Inventors: Santiago Iriarte, Mark Murphy
  • Patent number: 8854053
    Abstract: Provided is an apparatus for analyzing the state of oil-filled electrical devices. The apparatus simulates the state of an oil-filled electrical device in which copper wire wrapped in insulating paper is immersed in insulating oil. The apparatus for analyzing the state of oil-filled electrical devices includes a first paper-covered copper wire and a second paper-covered copper wire, which are adjacent to each other; a tank which holds the first and second paper-covered copper wires as well as insulating oil extracted from the oil-filled electrical device, thereby immersing the first and second paper-covered copper wires in the insulating oil; and a capacitance measurement unit which measures the capacitance between the first and second paper-covered copper wires. The first and second paper-covered copper wires includes copper wire and insulating paper wrapped therearound.
    Type: Grant
    Filed: March 31, 2010
    Date of Patent: October 7, 2014
    Assignee: Mitsubishi Electronics Corporation
    Inventor: Noboru Hosokawa
  • Patent number: 8823379
    Abstract: The invention relates to a logging tool (1) for determining properties of a fluid (2) surrounding the tool arranged downhole in a casing (3) comprising a wall (4) and having a longitudinal extension. The logging tool has a substantially longitudinal cylindrical shape with a longitudinal axis and, when seen in cross-section, a periphery (5). Moreover, the logging tool comprises a plurality of electrodes (6) arranged spaced around the longitudinal axis in the periphery of the tool so that the fluid flows between the electrodes and the casing wall and a means for measuring the capacitance between two electrodes in all possible combinations giving n*(n?1)/2 capacitance measurements for n electrodes.
    Type: Grant
    Filed: October 30, 2009
    Date of Patent: September 2, 2014
    Assignee: Welltec A/S
    Inventors: Jørgen Hallundbaek, Jimmy Kjaersgaard-Rasmussen
  • Patent number: 8810532
    Abstract: A test system for testing a capacitive-sense touchscreen is disclosed. Specifically, the test system may be incorporated within a controller that is also used to control operations of the touchscreen. The controller may include an Integrated Circuit and the test system may correspond to a test capacitor embedded into the Integrated Circuit.
    Type: Grant
    Filed: April 22, 2011
    Date of Patent: August 19, 2014
    Assignee: Pixart Imaging, Inc.
    Inventors: Sarangan Narasimhan, Mercedes E. Gil
  • Patent number: 8810262
    Abstract: An integrated low-noise sensing circuit with efficient bias stabilization in accordance with the present invention comprises a first capacitance sensing element, a second capacitance sensing element, a sub-threshold transistor and an amplifier circuit wherein the first stage is an input transistor. The second capacitance sensing element is connected to the first capacitance sensing element. The sub-threshold transistor comprises a body, a gate, a source, a drain, a source-body junction diode and a bulk. The gate forms on top of the body. The source forms on the body and is connected to the first capacitance sensing element and the second capacitance sensing element. The drain forms on the body and is connected to the gate and the amplifier output terminal. The source-body junction diode comprises an anode and a cathode. The anode is connected to the ground.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: August 19, 2014
    Assignee: National Tsing Hua University
    Inventors: Yung-Jane Hsu, Siew-Seong Tan
  • Patent number: 8803529
    Abstract: A device and method of determining a capacitance of a device is provided, which in one embodiment includes connecting a first terminal of a capacitor having a known capacitance to the first terminal of the device, applying an AC voltage to the first terminal of the device and the first terminal of the capacitor, measuring a current through the capacitor, measuring a current through the device, determining a first voltage across the device as a function of time, computing a capacitance of the device as a function of time by multiplying the capacitance of the capacitor by the ratio of the current through the device to the current through the capacitor, determining a capacitance of the device as a function of voltage based on the capacitance as a function of time and the first voltage across the device as a function of time, and outputting data of the first capacitance of the device as a function of voltage.
    Type: Grant
    Filed: September 17, 2013
    Date of Patent: August 12, 2014
    Assignee: Semiconductor Components Industries, LLC
    Inventor: Robert A. Ashton
  • Patent number: 8779782
    Abstract: A detection device for detecting an object by measuring the capacitance variation of the detection device includes at least a pair of sensor pads, each sensor pad being able to transmit or to receive an electric field. Each sensor pad can be used to measure the impedance variation of the pad, each sensor pad being driven by a driven rail impedance measuring system including an inverter, an oscillator, a power supply rail driver and switches, the measuring system being able to change the sensor pad function from electric field transmitter to electric field receiver or impedance measurer by turning on and off the oscillator to the input of the power supply rail driver of the inverter.
    Type: Grant
    Filed: October 17, 2008
    Date of Patent: July 15, 2014
    Assignee: Faurecia Bloc Avant
    Inventors: Jean-Marcel Aubry, Thomas W Bach
  • Patent number: 8773147
    Abstract: A capacitive touch sensing device by detecting induced electric field includes a differential amplifier, a resistor and a signal judgment circuit. The differential amplifier is electrically connected to a touch sensor. The resistor is electrically connected to a first input end and a second input end of the differential amplifier. The signal judgment circuit is electrically connected to an output end of the differential amplifier. As the touch sensor receives an induced electric field signal, the induced electric field signal is amplified by the differential amplifier and the signal judgment circuit determines whether the amplified induced electric field signal is a touch input.
    Type: Grant
    Filed: October 18, 2011
    Date of Patent: July 8, 2014
    Assignee: Invention Element Inc.
    Inventors: Hsiang-Yu Lee, Ping-Tsun Lin
  • Patent number: 8766657
    Abstract: A sensor has a strip resonator filter that energizes an emitter patch which emits an electric field out from the strip resonator filter (away from the strip resonator filter). The capacitance of the filter, or specifically the coupling capacitance and radiation pattern of the slotted patch, is altered when an object such as a finger is near the sensor. Resulting changes in a signal outputted by the filter can be used to determine how close the object is to the sensor. The strip resonator filter may be a half wavelength strip resonator coupled filter having three separate strips. The patch may have a slot and two accompanying strips. An arrangement of multiple sensors may detect the position of an object in two or three dimensions.
    Type: Grant
    Filed: August 19, 2011
    Date of Patent: July 1, 2014
    Assignee: Microsoft Corporation
    Inventors: Gerald DeJean, Trang Thai
  • Patent number: 8710987
    Abstract: A secure data entry device including a housing, tamper sensitive circuitry located within the housing and tampering alarm indication circuitry arranged to provide an alarm indication in response to attempted access to the tamper sensitive circuitry, the tampering alarm indication circuitry including at least one conductor, a signal generator operative to transmit a signal along the at least one conductor and a signal analyzer operative to receive the signal transmitted along the at least one conductor and to sense tampering with the at least one conductor, the signal analyzer being operative to sense the tampering by sensing changes in at least one of a rise time and a fall time of the signal.
    Type: Grant
    Filed: March 1, 2013
    Date of Patent: April 29, 2014
    Assignee: Verifone, Inc.
    Inventors: Yuval Ben-Zion, Ofer Itshakey
  • Patent number: 8692777
    Abstract: The testing of a multi-touch sensor panel for opens and shorts on its drive and sense lines is disclosed by placing a substantially ungrounded conductor diagonally over the touch sensor panel so that at least a portion of every drive line and every sense line is covered by the substantially ungrounded conductor. Pixels under the substantially ungrounded conductor can have strongly positive pixels, while pixels outside the substantially ungrounded conductor can have negative pixels. With the substantially ungrounded conductor in place, a backdrop of negative pixels is formed, and an image of touch can be obtained. By analyzing the image of touch, any opens and shorts on the drive and sense lines, any shorts between a drive and a sense line, or any open drive and sense lines can be quickly identified against the backdrop of negative pixels.
    Type: Grant
    Filed: September 25, 2008
    Date of Patent: April 8, 2014
    Assignee: Apple Inc.
    Inventors: Kenneth Lawrence Staton, Richard Wei Kwang Lim
  • Patent number: 8686735
    Abstract: An input device comprises a processing system coupled with a plurality of receiver paths. The processing system comprises a first capacitor and a bypass switch. The first capacitor is configured to be selectively coupled with the plurality of receiver paths. The bypass switch is configured for bypassing the first capacitor. The processing system is configured to selectively couple a first receiver path of the plurality of receiver paths with the first capacitor; acquire a measurement of a first resulting signal from at least one of the first receiver path or a second receiver path of the plurality of receiver paths while the first receiver path is coupled with the first capacitor and while the bypass switch is not bypassing the first capacitor; and determine whether the first receiver path is ohmically coupled with the second receiver path based on the measurement of the first resulting signal.
    Type: Grant
    Filed: February 16, 2011
    Date of Patent: April 1, 2014
    Assignee: Synaptics Incorporated
    Inventors: John Weinerth, Shahrooz Shahparnia, Vivek Pant, Joseph Kurth Reynolds
  • Patent number: 8643382
    Abstract: A method of testing a capacitive transducer circuit, for example a MEMS capacitive transducer, by applying a test signal via one or more capacitors provided in the transducer circuit.
    Type: Grant
    Filed: December 30, 2009
    Date of Patent: February 4, 2014
    Assignee: Wolfson Microelectronics plc
    Inventors: Colin Findlay Steele, John Laurence Pennock
  • Patent number: 8643383
    Abstract: The present techniques include methods and systems for detecting a failure in a capacitor bank of an electrical drive system. Embodiments include using discharge resistors to discharge capacitors in the capacitor bank, forming a neutral node of the capacitor bank. In different capacitor configurations, the neutral node is measured, and the voltage is analyzed to determine whether a capacitor bank unbalance has occurred. In some embodiments, the node is a neutral-to-neutral node between the discharged side of the discharge resistors and a neutral side of the capacitor bank, or between the discharged side of the discharge resistors and a discharged side of a second set of discharge resistors. In some embodiments, the node is a neutral-to-ground node between the discharged side of the discharge resistors and a ground potential.
    Type: Grant
    Filed: January 28, 2011
    Date of Patent: February 4, 2014
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Yuan Xiao, Lixiang Wei, Doyle F. Busse
  • Patent number: 8638086
    Abstract: A handheld device providing an internal view through an obscuring wall or other obscuring surfaces of hidden structural or facilities elements (such as wooden studs, electrical, plumbing, or HVAC), or the absence thereof. A continuous and homogeneous luminescent gas or other visual display material whose optical characteristics change as a result of the applied electric field is used both to simultaneously detect capacitance changes associated with hidden objects and to display those detected those objects. Different types of chambers are disclosed for the gas as well as means to prevent fringing effects. The gas is held just at its ionization level at which point it becomes optically visible. Circuitry is disclosed for controlling the energy source based on current draw or light output of the gas and feedback circuitry is disclosed to neutralize the effects of ambient light. Also disclosed is a device and method for the detection and mapping of electric fields.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: January 28, 2014
    Inventor: Lanny S. Smoot