Capacitor Patents (Class 324/548)
  • Patent number: 11302785
    Abstract: In a described example, an apparatus includes a transistor formed on a semiconductor substrate, the transistor including: a transistor gate and an extended drain between the transistor gate and a transistor drain contact; a transistor source contact coupled to a source contact probe pad; a first dielectric layer covering the semiconductor substrate and the transistor gate; a source field plate on the first dielectric layer and coupled to a source field plate probe pad spaced from and electrically isolated from the source contact probe pad; and the source field plate capacitively coupled through the first dielectric layer to a first portion of the extended drain.
    Type: Grant
    Filed: June 18, 2019
    Date of Patent: April 12, 2022
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Ramana Tadepalli, Chang Soo Suh
  • Patent number: 11269019
    Abstract: A voltage detection apparatus for an assembled battery includes: a capacitor; input-side switches provided between the capacitor and detection targets each including at least one battery cell; a voltage detection unit configured to detect the voltage of the capacitor; output-side switches provided between the capacitor and the voltage detection unit; a capacitor charging unit configured to charge the capacitor using a specific detection target; a first-voltage acquiring unit configured to acquire a first voltage which is the voltage of the capacitor after the passage of a first period from the charging of the capacitor; a second-voltage acquiring unit configured to acquire a second voltage which is the voltage of the capacitor after the passage of a second period from the acquisition of the first voltage; and a fault determining unit configured to determine, based on the acquired first and second voltages, whether a leak fault has occurred in the capacitor.
    Type: Grant
    Filed: February 7, 2020
    Date of Patent: March 8, 2022
    Assignee: DENSO CORPORATION
    Inventor: Takumi Shimizu
  • Patent number: 11187740
    Abstract: A time dependent dielectric breakdown test structure includes a plurality of test units connected in parallel between a constant voltage and a ground. Each of the plurality of test units includes a dielectric test sample connected to the constant voltage; and a current restraint unit connected between the dielectric test sample and the ground, for restraining a breakdown current from flowing on the dielectric test sample after the constant voltage has broken the dielectric test sample.
    Type: Grant
    Filed: December 2, 2018
    Date of Patent: November 30, 2021
    Assignee: Yangtze Memory Technologies Co., Ltd.
    Inventors: Shengwei Yang, Kun Han
  • Patent number: 11075634
    Abstract: A switching operation sensing apparatus includes an input operation unit, an oscillation circuit, a frequency digital converter, and a touch detection circuit. The input operation unit includes a first switching member integrally formed with a housing. The oscillation circuit is configured to generate an oscillation signal having a resonant frequency, varying based on a capacitive change or an inductive change, depending on a touch input member in contact with the first switching member during an input operation. The frequency digital converter is configured to convert the oscillation signal into a count value. The touch detection circuit is configured to detect capacitive sensing and inductive sensing based on a slope change of the count value received from the frequency digital converter, and output corresponding touch detection signals of different levels based on the detection.
    Type: Grant
    Filed: August 20, 2020
    Date of Patent: July 27, 2021
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Je Hyuk Ryu, Joo Yul Ko, Yong Woon Ji, Jong Woo Lee, Byung Joo Hong
  • Patent number: 11061001
    Abstract: There is provided a photoacoustic measurement apparatus capable of appropriately detecting a single failure state even in the single failure state so that it is possible to prevent an operation in the single failure state from continuing. There are included: a laser light source having a flash lamp and a laser medium; an excitation light source power supply having a capacitor for supplying a charge voltage to the flash lamp, a charging circuit for charging the capacitor, a first voltage dividing circuit and a second voltage dividing circuit for dividing a voltage charged in the capacitor, and a failure detection circuit that detects a failure by comparing voltages obtained by voltage division of the first voltage dividing circuit and the second voltage dividing circuit; and an ultrasound probe that detects photoacoustic waves generated inside a subject by emission of light emitted from the laser light source to the subject.
    Type: Grant
    Filed: May 1, 2019
    Date of Patent: July 13, 2021
    Assignee: FUJIFILM Corporation
    Inventors: Kazuhiro Hirota, Keiji Tsubota
  • Patent number: 11031882
    Abstract: A power conversion device includes power conversion circuitry including a plurality of submodules connected in series to each other. The power conversion device further includes: a signal reception unit configured to receive a signal representing a voltage of a capacitor in each of the submodules; a time calculation unit configured to calculate at least one of a charging time of the capacitor and a discharging time of the capacitor based on the signal; and a determination unit configured to determine whether the capacitor has degraded or not based on at least one of a first result of comparison of the charging time with a reference charging time serving as a reference for determining degradation of the capacitor, and a second result of comparison of the discharging time with a reference discharging time serving as a reference for determining degradation of the capacitor.
    Type: Grant
    Filed: May 26, 2017
    Date of Patent: June 8, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kazuyori Tahata, Yoshiyuki Kono, Kenichi Kuroda, Shuhei Fujiwara, Ryosuke Uda
  • Patent number: 10983011
    Abstract: A system and method for determining the lifetime of a capacitor element, specifically a capacitor element comprising a solid electrolyte that undergoes oxidation, is provided. The system and method utilize a capacitor element comprising an anode body, a dielectric, and a solid electrolyte, and may also comprise other stages of the production of a capacitor. The system and method provide an estimation of the life of the capacitor while considering the oxidation of the solid electrolyte.
    Type: Grant
    Filed: April 30, 2018
    Date of Patent: April 20, 2021
    Assignee: AVX Corporation
    Inventors: Jan Petrzilek, Miloslav Uher
  • Patent number: 10948541
    Abstract: A system for diagnosing switching element selectively connecting Y-capacitors to ground is provided. The state of a switching device in a power conversion circuit is adjusted such that voltages of different levels are applied to the Y-capacitors, respectively. Therefore, a Y-capacitor disconnect switch which connects a plurality of Y-capacitors connected in common to a DC link to chassis ground is diagnosed.
    Type: Grant
    Filed: October 16, 2019
    Date of Patent: March 16, 2021
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Ho Joon Shin, Nam Koo Han, Sang Yoo Lee, Heon Young Kwak, Hong Geuk Park
  • Patent number: 10917002
    Abstract: Provided is a capacitor discharge device that quickly and safely discharges a capacitor charged with energy inside a sub-module of an MMC converter, the device including: a capacitor storing a DC voltage inside a sub-module of an MMC converter; a power supply unit supplying operating power required in the submodule by using the voltage stored in the capacitor; a first resistor connected in parallel to the capacitor; a second resistor having a lower resistance value and a larger heat capacity than the first resistor so as to rapidly discharge the capacitor storing the voltage; a first switching contact connecting and disconnecting the capacitor and the second resistor; a switching unit operating switching of the first switching contact by the operating power; a second switching contact connecting and disconnecting the power supply unit and the switching unit; and a control unit operating switching of the second switching contact.
    Type: Grant
    Filed: June 22, 2016
    Date of Patent: February 9, 2021
    Assignee: HYOSUNG HEAVY INDUSTRIES CORPORATION
    Inventors: Jae Hoon Oh, Doo Young Lee, Ji Hoon Kim
  • Patent number: 10910950
    Abstract: A power conversion device including an intermediate capacitor that carries out a charging and discharging operation and a voltage sensor that detects a voltage of the intermediate capacitor, and including a current sensor that detects a current flowing in a reactor, and an abnormality determining unit that determines that there is an abnormality of the voltage sensor using a current value calculated based on a detected value from the current sensor, wherein a gain error, an offset error, and a sticking error of the voltage sensor can be detected.
    Type: Grant
    Filed: May 8, 2017
    Date of Patent: February 2, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Nobuhiro Kihara, Yuta Komatsu, Takashi Kaneyama, Masaki Sawamura, Noriyuki Wada, Yuya Tanaka
  • Patent number: 10868487
    Abstract: A motor drive device includes a storage unit that stores an initial value of a static capacitance correlation value of a static capacitance of a smoothing capacitor in an initial state, when the smoothing capacitor is connected to an inverter. A measurement unit of the motor drive device includes a timing generation circuit and a calculation unit. The measurement unit measures the static capacitance correlation value of the smoothing capacitor as a measured value at a time after the initial state. A determination unit of the motor drive device determines whether there is deterioration in the smoothing capacitor based on a relationship between the measured value and the initial value. A restrictor of the motor drive device restricts a maximum rotation number of a motor when capacitor deterioration is determined, thereby reducing a ripple current, limiting heat generation in the capacitor, and extending the product life of the capacitor, without increasing the number of parts in the motor drive device.
    Type: Grant
    Filed: December 17, 2018
    Date of Patent: December 15, 2020
    Assignee: DENSO CORPORATION
    Inventors: Takashi Imura, Junya Oishi
  • Patent number: 10742027
    Abstract: A method for online limit early-warning to a shunt capacitor bank, and the method comprises: performing harmonic monitoring to the shunt capacitor bank; obtaining a measured voltage and a measured current, based on raw data obtained by the harmonic monitoring; obtaining a first parameter representing a ratio of the measured voltage to a rated voltage and a second parameter representing a ratio of the measured current to a rated current, based on the measured voltage and the measured current; obtaining a relation between an impedance correlation quantity of the shunt capacitor bank and a background harmonic voltage ratio, based on the first parameter, the second parameter, and an obtained series reactance ratio of a detected capacitor circuit; and performing online limit early-warning to the shunt capacitor bank, based on the relation. The present invention also discloses a device for online limit early-warning to a shunt capacitor bank.
    Type: Grant
    Filed: January 25, 2018
    Date of Patent: August 11, 2020
    Assignee: Wuxi Electric Power Company of State Grid Jiangsu Electric Power Corporation
    Inventors: Jun Wu, Juncheng Liu, Jun Zhu, Haiping Shen, Yuan Feng
  • Patent number: 10693434
    Abstract: In general, the subject matter described in this disclosure can be embodied in methods, systems, and program products for characterizing a device under test. An electrical waveform is received from the device under test and sampled to generate an array of data values. User input selects a particular position of the electrical waveform on a display, and identifies a corresponding starting time. A decay of a value at the starting time is identified and the array is analyzed to identify multiple data values that correspond to the decayed value. An ending time is then determined using the multiple data values, and a decay time between the starting time and ending time is determined and presented on a display device.
    Type: Grant
    Filed: August 1, 2017
    Date of Patent: June 23, 2020
    Assignee: Teledyne LeCroy, Inc.
    Inventors: Michael G. Hertz, Peter J. Pupalaikis
  • Patent number: 10628621
    Abstract: A method of lifing a mechanical component is provided. The method includes: (a) providing a model of the component in which the component is divided into a plurality of regions, and (b) performing consecutively, for each of a consecutive series of actual or virtual missions, the sub-steps of: (b-i) determining the number of operational cycles in the most recent actual or virtual mission for each region, (b-ii) determining a respective unmodified additional cumulative risk associated with each region, (b-iii) determining a respective modified additional cumulative risk associated with each region, (b-iv) determining an updated total modified cumulative risk associated with each region, and (b-v) summing the updated total modified cumulative risks of the regions to determine a modified risk of failure of the component.
    Type: Grant
    Filed: April 11, 2017
    Date of Patent: April 21, 2020
    Assignee: ROLLS-ROYCE plc
    Inventors: Martin B Joinson, Ian C Booth
  • Patent number: 10598738
    Abstract: The invention relates to a method for maintenance of a frequency converter for driving an electric motor of a transportation device, said frequency converter being supplied with AC mains power via a contactor, and including a rectifier circuit for providing a DC supply voltage, a capacitive intermediate circuit for leveling DC supply voltage, and an inverter circuit for providing power to the electric motor. In the method, after the transportation device has been vacant for a predetermined time period, said contactor is opened to disable power flow from mains supply to the frequency converter, and a test load is connected to the intermediate circuit, parallel to a capacity of the intermediate circuit. The DC supply voltage Udc(t) is detected, and the detected DC supply voltage Udc(t) is utilized for establishing a maintenance information indicating that a maintenance should be done on the frequency converter.
    Type: Grant
    Filed: December 21, 2018
    Date of Patent: March 24, 2020
    Assignee: KONE CORPORATION
    Inventor: Matti Mustonen
  • Patent number: 10502792
    Abstract: A method for evaluating the insulating performance of a separator using an insulating performance evaluation system according to an exemplary embodiment of the present disclosure includes: preparing a measurement subject wherein a metal contact layer is interposed between two sheets of separator so as to form a plurality of local contacts with the surface of the separator; sandwiching the measurement subject between an upper jig and a lower jig; applying a voltage the magnitude of which varies with time between the upper jig and the lower jig using a voltage application unit; receiving a current measurement value flowing between the upper jig and the lower jig as an input from a current measurement unit; and determining the voltage value at which the current measurement value is equal to or greater than a preset critical value as a dielectric breakdown voltage, by a control unit.
    Type: Grant
    Filed: February 26, 2019
    Date of Patent: December 10, 2019
    Assignee: LG CHEM, LTD.
    Inventors: Hyun-Kyung Shin, Dong-Wook Sung, Sang-Joon Lee
  • Patent number: 10416802
    Abstract: Disclosed is a touch sensor and method for detecting a touch in a capacitive touchscreen application, wherein the touch sensor is capable of distinguishing between a finger hovering above the touch sensor and a touch from a stylus having a small contact surface area without having to adjust the sensitivity of the touch sensor. The touch sensor includes a first sensing electrode, a transmit electrode, and a second sensing electrode, wherein the second sensing electrode is positioned substantially around the perimeter of the inner circuitry (i.e., transmit electrode and first sensing electrode). A touch is detected by sensing changes in a first capacitance between the transmit electrode and first sensing electrode and a second capacitance between the transmit electrode and second sensing electrode. The changes in the first and second capacitances are compared to determine whether the changes in the capacitances are due to a finger hover or a touch.
    Type: Grant
    Filed: September 14, 2015
    Date of Patent: September 17, 2019
    Assignee: STMicroelectronics Asia Pacific Pte Ltd
    Inventors: Praveesh Chandran, Gee-Heng Loh, Ravi Bhatia, Ys On
  • Patent number: 10381166
    Abstract: Disclosed are tantalum capacitors having enhanced volumetric efficiency, effective series resistance, effective series inductance, and high frequency performance when compared to existing tantalum capacitors. Also disclosed is a screening process for tantalum capacitors to enhance reliability.
    Type: Grant
    Filed: May 25, 2016
    Date of Patent: August 13, 2019
    Assignee: Vishay Sprague, Inc.
    Inventors: Alex Eidelman, Yongjian Qiu, Pavel Vaisman, Yuri Stangrit, Rita Eisenberg, Natali Ostrovsky
  • Patent number: 10295609
    Abstract: A deterioration state detection apparatus for detecting a deterioration state of capacity enabling charge or discharge of a nonaqueous electrolyte secondary battery includes: an acquisition unit that acquires a capacitance of the nonaqueous electrolyte secondary battery: and a determination unit that determines the deterioration state of capacity enabling charge or discharge of the nonaqueous electrolyte secondary battery, from change of the acquired capacitance.
    Type: Grant
    Filed: June 18, 2014
    Date of Patent: May 21, 2019
    Assignee: GS Yuasa International Ltd.
    Inventors: Yuichi Ikeda, Yohei Tao, Shigeki Yamate
  • Patent number: 10281512
    Abstract: A method can be used for testing a charge-retention circuit for measurement of a time interval having a storage capacitor coupled between a first biasing terminal and a floating node, and a discharge element coupled between the floating node and a reference terminal. The discharge element is configured to implement discharge of a charge stored in the storage capacitor by leakage through a corresponding dielectric. The method includes biasing the floating node at a reading voltage, detecting a biasing value of the reading voltage, implementing an operation of integration of the discharge current in the discharge element with the reading voltage kept constant at the biasing value, and determining an effective resistance value of the discharge element as a function of the operation of integration.
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: May 7, 2019
    Assignees: STMicroelectronics (Rousset) SAS, STMicroelectronics S.r.l., STMicroelectronics (Crolles 2) SAS
    Inventors: Antonino Conte, Enrico Castaldo, Raul Andres Bianchi, Francesco La Rosa
  • Patent number: 10218268
    Abstract: The present disclosure relates to a voltage reference circuit and a method of providing a voltage reference. The voltage reference circuit uses a switched capacitor arrangement to move charge between capacitors during different phases of operation of the circuit to which the voltage reference is being provided. The circuit being provided with a voltage reference may be an analog-to-digital converter (ADC). A reservoir capacitor is used to supply the reference voltage. During a phase in which no voltage reference is required, charge is shared between the capacitors of the switched capacitor arrangement, in order to boost the charge on the reservoir capacitor. After charge sharing, the reservoir capacitor is topped up with an output from a reference buffer. The reservoir capacitor may then be used again in the next conversion phase.
    Type: Grant
    Filed: March 26, 2018
    Date of Patent: February 26, 2019
    Assignee: Analog Devices Global Unlimited Company
    Inventors: Maitrey Kamble, Michael C. W. Coln, Vinayak Mukund Kulkarni
  • Patent number: 10197619
    Abstract: A power supply monitoring apparatus includes: a plurality of power supplies that are connected in series; and a capacitor that is connected to each of positive and negative electrodes of the plurality of power supplies via a plurality of switch elements. The power supply monitoring apparatus determines states of the plurality of switch elements, using a voltage value of the capacitor that is acquired when a first switch element of the plurality of switch elements is turned on, the first switch element being connected to one of a total negative-electrode side and a total positive-electrode side of the plurality of power supplies.
    Type: Grant
    Filed: November 8, 2016
    Date of Patent: February 5, 2019
    Assignee: FUJITSU TEN Limited
    Inventors: Shota Kawanaka, Sho Tamura
  • Patent number: 10175089
    Abstract: A method for monitoring a measuring device of automation technology, wherein the measuring device has a capacitive sensor the sensor has at least one capacitor, and the at least one capacitor is applied for determining or monitoring a process variable. A loss resistance of the at least one capacitor is measured by determining the charge state of the at least one capacitor at a first point in time and at a subsequent, second point in time, and, based on a change of the charge state between the first point in time and the second point in time, information is won concerning disturbance of the ability of the measuring device to function.
    Type: Grant
    Filed: August 12, 2014
    Date of Patent: January 8, 2019
    Assignee: ENDRESS + HAUSER FLOWTEC AG
    Inventors: Hanspeter Schmid, Werner Tanner, Dirk Sutterlin, Martin Koch
  • Patent number: 10088510
    Abstract: A voltage of a first capacitor is compared with a threshold voltage and a signal corresponding to the comparison result is generated at each of a first timing during a period after the transfer of a positive charge has ended and before the transfer of a negative charge starts and a second timing during a period after the transfer of the negative charge has ended and before the transfer of the positive charge starts. In each of the case where a positive charge is transferred and the case where a negative charge is transferred, operations (digitization of an integrated value and a feedback operation) of a delta sigma modulator are performed.
    Type: Grant
    Filed: December 27, 2016
    Date of Patent: October 2, 2018
    Assignee: ALPS ELECTRIC CO., LTD.
    Inventor: Tomoyuki Sawataishi
  • Patent number: 10060828
    Abstract: An imbedded control system is disclosed for use with an engine having a combustion chamber and an associated piston. The control system may have at least one sensor configured to generate a signal indicative of a combustion process occurring inside the combustion chamber, and a controller in communication with the at least one sensor. The controller may be configured to determine an amount of heat and a pressure generated inside the combustion chamber based on the signal and a combustion model, to determine a heat flux through the piston based on the amount of heat and a heat flux model, and to determine a temperature at a rim of the piston based on the heat flux and a thermal model. The controller may be further configured to track a time at the temperature and the pressure, and to determine a damage count of the piston based on the time.
    Type: Grant
    Filed: March 31, 2016
    Date of Patent: August 28, 2018
    Assignee: Caterpillar Inc.
    Inventors: Austin Paul Roe, Anthony T. Petrou, Matthew Rowan, Timothy Edward McGreevy
  • Patent number: 10006956
    Abstract: Systems and methods for determining an operational condition of a capacitor package are disclosed. According to an aspect, a system may include a capacitor package including a dielectric material operatively connected between a first terminal and a second terminal. The system may include a Zener diode being operatively connected with its cathode at a third terminal and its anode at the second terminal. The system may also include a test pin being conductively connected to the third terminal. The system may also include a testing module configured to receive an electrical output from the test pin. The testing module may also be configured to determine an operational condition of the capacitor package based on the electrical output. The testing module may further be configured to present the operational condition of the capacitor package.
    Type: Grant
    Filed: March 26, 2015
    Date of Patent: June 26, 2018
    Assignee: Lenovo Enterprise Solutions (Singapore) Pte. Ltd.
    Inventors: Jeffrey R. Hamilton, Michael DeCesaris, Ann Richter, Alfredo Aldereguia
  • Patent number: 9812986
    Abstract: An apparatus for balancing a voltage of a direct current (DC) link capacitor of an inverter is provided. The apparatus of the present disclosure includes a switching unit connected to a node (a reference point) between the first and second resistors, which are connected in series to each other, and a node (a neutral point) between the first and second capacitors, which are connected in series to each other, and configured to short and open between the reference point and the neutral point, and a control unit configured to control the switching unit to short between the reference point and the neutral point when a voltage of the reference point (a reference point voltage) and a voltage of the neutral point (a neutral point voltage) are different from each other.
    Type: Grant
    Filed: January 6, 2017
    Date of Patent: November 7, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Ii-Pyo Hong
  • Patent number: 9764654
    Abstract: A device for charging a battery, or a battery of an electric traction automotive vehicle, based on a three-phase or single-phase power supply network, including a filtering stage including a capacitive assembly and configured to be connected to the power supply network. The device includes a mechanism to monitor capacitive assembly and to detect a deviation in value of the capacitance of at least one capacitor of the capacitive assembly on the basis of voltages and currents measured across the input terminals of the filtering stage.
    Type: Grant
    Filed: September 10, 2012
    Date of Patent: September 19, 2017
    Assignee: RENAULT s.a.s
    Inventor: Julien Malrieu
  • Patent number: 9739735
    Abstract: A method for on-line monitoring an electrolytic capacitor condition comprising: measuring a voltage ripple across the electrolytic capacitor and the current ripple flowing through the electrolytic capacitor; measuring the temperature of the electrolytic capacitor; emulating the monitored electrolytic capacitor using a capacitor model comprising a capacitor and a solid state adjustable resistor, applying one of the measured ripple to the capacitor model, adjusting the solid state adjustable resistor to minimize the error between an estimated ripple provided by the capacitor model and the other measured ripple not applied to the capacitor model, and estimating an equivalent series resistance of the monitored electrolytic capacitor using value of the solid state adjustable resistor.
    Type: Grant
    Filed: June 10, 2016
    Date of Patent: August 22, 2017
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Stefan Mollov, Laurent Foube
  • Patent number: 9689907
    Abstract: A method and device for measuring a variation of a capacitance, the device includes: a capacitance having a voltage across its terminals; a charging element and a discharging element; a comparison element; control elements activating the charging element or the discharging element as a function of the value of the voltage across the terminals of the capacitance and of which an output voltage has a high value during the charging and a low value during the discharging; a counter measuring a time representative of a predetermined number of charging and discharging cycles of the capacitance; and an additional capacitance electrically connected to the output voltage and to the capacitance, able to be charged and discharged simultaneously with the charging and discharging of the capacitance.
    Type: Grant
    Filed: December 11, 2013
    Date of Patent: June 27, 2017
    Assignees: CONTINENTAL AUTOMOTIVE FRANCE, CONTINENTAL AUTOMOTIVE GMBH
    Inventor: Xavier Hourne
  • Patent number: 9625517
    Abstract: A leakage current detection method and apparatus are provided. The method is applied to leakage current detection for a board-mounted component on a printed circuit board assembly (PCBA) board, and includes: providing a fixed voltage for a leakage current input end of a board-mounted component under detection, and connecting a leakage current output end to an inverting input end of an operational amplifier of a resistance testing module, where the resistance testing module includes the operational amplifier and a reference resistor that is connected between the inverting input end of the operational amplifier and the voltage output of the operational amplifier; detecting an output voltage of the resistance testing module; and calculating, based on Ohm's law and according to the output voltage and the reference resistor, a leakage current flowing through the board-mounted component under detection.
    Type: Grant
    Filed: September 26, 2014
    Date of Patent: April 18, 2017
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Qingsong Zhu, Lujun Xie
  • Patent number: 9515576
    Abstract: A bridge circuit and a short-circuit protection method thereof. The bridge circuit includes an input power unit, a converter unit, a first capacitor, a second capacitor, a detection unit and a bridge inverter unit. The input power unit includes a first electrode and a second electrode. The converter unit is coupled to the input power unit. The first capacitor includes a first terminal and a second terminal. The second capacitor includes a first terminal and a second terminal. The bridge inverter unit includes a plurality of switches and is coupled to the converter unit, the first capacitor, the second capacitor, the detection unit and the second electrode. The detection unit issues a short-circuit signal to a control unit when the detection unit detects a current variation on the second capacitor.
    Type: Grant
    Filed: March 4, 2015
    Date of Patent: December 6, 2016
    Assignee: VOLTRONIC POWER TECHNOLOGY CORP.
    Inventors: Yi-Sheng Yuan, Chun-Juan Zhan, Juor-Ming Hsieh
  • Patent number: 9488686
    Abstract: Methods and apparatus are presented for detecting filter capacitor degradation in a power converter in which filter circuit branch currents and voltages are concurrently measured, nominal current values are automatically computed according to the measured voltages, the operating frequency and nominal capacitance values, and current change values are calculated based on the difference between the measured currents and the calculated nominal currents, and the change values are evaluated to selectively identify filter capacitor degradation conditions in the filter circuit.
    Type: Grant
    Filed: February 24, 2014
    Date of Patent: November 8, 2016
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Santosh Manjunath Bhandarkar, Sinuhe Imuris Benitez Escobar
  • Patent number: 9389263
    Abstract: Methods and apparatus are presented for detecting degrading filter capacitors in motor drives or other power converters, in which an expected DC equivalent voltage and a measured DC equivalent voltage are computed according to sampled filter circuit currents and voltages, and compared to selectively identify filter capacitor degradation conditions in a power converter filter circuit.
    Type: Grant
    Filed: June 5, 2014
    Date of Patent: July 12, 2016
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Christian Sartler, Yogesh Patel, Lixiang Wei, Mark G. Phillips
  • Patent number: 9385739
    Abstract: The present invention relates to a circuit for converting between an analog input voltage and a corresponding digital representation of the analog input voltage. First, second and third capacitors are used, the first and second capacitors being matched, the third capacitor serving as an accumulator. A first switch is coupled to one end of the first capacitor, and a second switch is coupled between the one end of the first capacitor and one end of the second capacitor. A third switch coupled between the one end of the second capacitor and one end of the third capacitor, with a discharge circuit being coupled between the one end of the third capacitor and an opposite end of the second capacitor. When the third switch is closed the discharge circuit fully discharges the second capacitor onto the third capacitor.
    Type: Grant
    Filed: June 15, 2015
    Date of Patent: July 5, 2016
    Inventor: Dennis Michael Koglin
  • Patent number: 9377428
    Abstract: A method of characterizing a quality of a polycrystalline diamond compact (PDC) cutter includes obtaining a PDC cutter that includes a leached layer and an unleached layer. The unleached layer is positioned adjacent to the leached layer, and the leached layer has at least a portion of a catalyst material removed from therein. The method further includes measuring capacitance values of the PDC cutter at multiple frequencies of an electrical signal provided to the PDC cutter by a capacitance measuring device to measure the capacitance values of the PDC cutter. The method also includes characterizing a quality of the PDC cutter based on a lowest capacitance value from among the capacitance values. Each capacitance value of the capacitance values is measured at a respective frequency of the multiple frequencies of the electrical signal.
    Type: Grant
    Filed: May 23, 2014
    Date of Patent: June 28, 2016
    Assignee: VAREL INTERNATIONAL IND., L.P.
    Inventors: Federico Bellin, Vamsee Chintamaneni
  • Patent number: 9318944
    Abstract: Apparatus and methods are provided for detecting degradation of delta-connected filter capacitors in an active front end (AFE) power converter, in which delta circuit capacitor leg currents are calculated based on measured branch circuit currents, and filter capacitor impedance values are computed based on the calculated leg currents as well as measured line-to-line voltages and corresponding phase angles for comparison with one or more thresholds to selectively detect degradation of the filter capacitors. Further apparatus and methods are provided for detecting degradation of Y-connected filter capacitors by computation of fundamental frequency RMS impedance values as ratios of RMS capacitor voltages and RMS circuit branch currents, and comparison of the calculated RMS impedance values with one or more thresholds.
    Type: Grant
    Filed: April 29, 2013
    Date of Patent: April 19, 2016
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Semyon Royak, Robert J. Breitzmann
  • Publication number: 20150130273
    Abstract: In order to detect deterioration of a DC link capacitor between a DC source and an inverter load in an electric propulsion vehicle, capacitance of the link capacitor must be accurately measured during in-service use. A charge is established on the link capacitor. The capacitor is isolated from the source and the inverter load. A constant current circuit is activated to discharge the capacitor. A first voltage is measured across the capacitor at a first time during the discharging. A second voltage is measured across the capacitor at a second time during the discharging. A discharge current flowing from the capacitor is measured during the discharging. The capacitance is calculated in response to the discharge current multiplied by a ratio of a difference between the second and first times to a difference between the first and second voltages. The calculated capacitance is monitored for a decline indicative of a failure.
    Type: Application
    Filed: November 12, 2013
    Publication date: May 14, 2015
    Applicant: FORD GLOBAL TECHNOLOGIES, LLC
    Inventors: Arvind Govindaraj, Guangyin Lei, Mansur A. Blackman, Chingchi Chen
  • Patent number: 9026981
    Abstract: Embodiments relate to methods, computer systems and computer program products for performing a dielectric reliability assessment for an advanced semiconductor. Embodiments include receiving data associated with a test of a macro of the advanced semiconductor to a point of dielectric breakdown. Embodiments also include scaling the data for the macro down to a reference area and extracting a parameter for a Weibull distribution from the scaled down data for the reference area. Embodiments further include deriving a cluster factor (?) from the scaled down data for the reference area and projecting a failure rate for a larger area of the advanced semiconductor based on the extracted parameter, the cluster factor and the recorded data associated with the dielectric breakdown of the macro.
    Type: Grant
    Filed: June 19, 2014
    Date of Patent: May 5, 2015
    Assignee: International Business Machines Corporation
    Inventors: Baozhen Li, James H. Stathis, Ernest Y. Wu
  • Publication number: 20150092460
    Abstract: Methods and systems are disclosed for detecting capacitor degradation in an input filter of an active front end power conversion system in which voltage and current sensing is performed to determine sequence component impedance asymmetry to detect filter capacitor degradation according to the value of an off-axis admittance matrix component for Delta or Y-connected filter capacitor banks without sensitivity to voltage unbalance, and with the capability to identify particular degraded capacitor locations based on individual impedance values.
    Type: Application
    Filed: October 1, 2013
    Publication date: April 2, 2015
    Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.
    Inventors: Rangarajan Tallam, Russel Kerkman
  • Patent number: 8981788
    Abstract: In a calibration process, a capacitor unit is removed from end terminals, or namely, respective capacitors are not connected to terminals. A prescribed voltage (a known voltage) is applied between these end terminals. Among bypass switches of a bypass circuit, the bypass switches connected to one terminal or two or more consecutive terminal pairs from the positive end terminal side are ON. Terminal voltages other than the negative end terminal are obtained and stored as calibration information.
    Type: Grant
    Filed: August 6, 2014
    Date of Patent: March 17, 2015
    Assignee: Taiyo Yuden Co., Ltd.
    Inventors: Katsuei Ishida, Osamu Hamada
  • 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: 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: 8947107
    Abstract: Described herein are systems and methods that facilitate the measurement of the capacitance of high voltage devices while shielding an active device involved in the measurement from the high voltage. The systems and methods employ capacitors to store the high voltage such that the active device does not experience the high voltage. Placement of a reset device ensures that the active device is shielded from the high voltage.
    Type: Grant
    Filed: February 13, 2013
    Date of Patent: February 3, 2015
    Assignee: Semtech Corporation
    Inventor: Michel Alain Chevroulet
  • Patent number: 8947100
    Abstract: An open circuit detecting system configured to connect to an object circuit for getting an electrical signal through a virtual ground induced by characteristic impedance of a parasitic capacitor and determining whether the object circuit is open according to the electrical signal.
    Type: Grant
    Filed: November 23, 2011
    Date of Patent: February 3, 2015
    Assignee: TPK Touch Solutions Inc.
    Inventors: Jui-Jung Chiu, Yi-Kun Li
  • Patent number: 8941391
    Abstract: A multi purpose capacitive sensor suitable for indicating close proximity of a person to a surface along a large-size truck as well as along a medium-size painting or a pocket-size mobile phone is disclosed. The sensor comprises a voltage measuring device provided with a signal ground connected to a first pole of an oscillating voltage source that has a second pole connected to a signal input of the voltage measuring device. This input has a first capacitance to earth and a second capacitance to the signal ground. A third capacitance is exhibited to earth by the second pole of said voltage source. According to the invention, a prebias component is connected between the second pole of the voltage source and the signal input of the voltage measuring device.
    Type: Grant
    Filed: June 29, 2011
    Date of Patent: January 27, 2015
    Assignee: P-Phone Control AB
    Inventor: Lars Wern
  • Patent number: 8933705
    Abstract: An electronic circuit with a plurality of connections for a plurality of sensor elements is provided, wherein the electronic circuit is configured to detect, with at least one multiplexing method, the presence of an object in at least one observation area of the sensor elements and to distinguish between the sensor elements. Also a method for determining the position of at least one object situated in at least one observation area of sensor elements relative to the sensor elements is provided, whereby with a multiplexing method an electric variable for each sensor element is detected, which is indicative for the presence of the object in the respective observation area.
    Type: Grant
    Filed: November 11, 2010
    Date of Patent: January 13, 2015
    Assignee: Microchip Technology Germany GmbH II & Co. KG
    Inventors: Claus Kaltner, Holger Steffens
  • Patent number: 8922223
    Abstract: A timer circuit is provided with a comparator CMP1, a control unit and a comparator CMP2. The comparator CMP1 compares a potential of the capacitance element with the potential of a reference voltage VREF_H, and if the potential of the capacitance element reaches the potential of the reference voltage VREF_H, outputs a pre-specified time-up signal. The control unit performs control such that the potential of the capacitance element is higher than a potential of a reference voltage VREF_S, which is higher than the ground potential and lower than the potential of the reference voltage VREF_H. The comparator CMP2 compares the potential of the capacitance element with the potential of the reference voltage VREF_S, and if the potential of the capacitance element is lower than the potential of the reference voltage VREF_S, outputs a short circuit detection signal indicating that a short circuit state of the capacitance element has been detected.
    Type: Grant
    Filed: May 2, 2011
    Date of Patent: December 30, 2014
    Assignee: LAPIS Semiconductor Co., Ltd.
    Inventor: Koji Suzuki
  • 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: 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