Patents Examined by Joseph Chang
  • Patent number: 10910888
    Abstract: A power transfer system comprises a patient transport apparatus and a power transfer device. The power transfer system provides convenience and ease of connection between a power source and the patient transport apparatus to provide power to one or more electrically powered devices on the patient transport apparatus or to provide energy for an energy storage device on the patient transport apparatus.
    Type: Grant
    Filed: October 23, 2018
    Date of Patent: February 2, 2021
    Assignee: Stryker Corporation
    Inventors: Kevin M. Patmore, Christopher Ryan Sweeney, Chad Conway Souke, Daniel V. Brosnan, Kurosh Nahavandi, Annie Desaulniers, Alexey Titov, Jeffrey S. Dunfee, II, Aaron D. Furman, Krishna S. Bhimavarapu
  • Patent number: 10911050
    Abstract: A frequency reference oscillator device and method of providing a frequency reference signal. The oscillator device includes a first oscillator including a first resonator having first long-term stability and a first frequency-vs-temperature turnover temperature, the first oscillator being capable of providing a first frequency signal. Further, the device includes and a second oscillator including a second resonator having second long-term stability, which is inferior to the first long-term stability, and a second frequency-vs-temperature turnover temperature, the second oscillator being capable of providing a second frequency signal.
    Type: Grant
    Filed: September 5, 2018
    Date of Patent: February 2, 2021
    Assignee: KYOCERA Tikitin Oy
    Inventors: Aarne Oja, Antti Jaakkola
  • Patent number: 10903659
    Abstract: The invention relates to a method for correcting deviations of power produced by a power plant which includes at least one wind turbine generator and possibly other types of power generating units. The power deviations, i.e. deviations from a power reference for the power plant, are determined as energy errors. The invention addresses solutions for determining and compensating the energy errors.
    Type: Grant
    Filed: May 16, 2018
    Date of Patent: January 26, 2021
    Assignee: VESTAS WIND SYSTEMS A/S
    Inventors: Mu Wei, Kouroush Nayebi, Søren Kappelgaard
  • Patent number: 10903681
    Abstract: A solar display device and a power switching method are disclosed. The solar display device includes a plurality of solar pixel components, a plurality of micro display components and a power control circuit. The solar pixel components are configured to generate a first solar power and a second solar power. The power control circuit is configured to compare the first solar power and a reference signal. The power control circuit is further configured to drive the micro display components by using one of a system power and the second solar power according to a comparison result.
    Type: Grant
    Filed: October 30, 2019
    Date of Patent: January 26, 2021
    Assignee: Acer Incorporated
    Inventors: Jui-Chieh Hsiang, Chih-Chiang Chen
  • Patent number: 10892712
    Abstract: A stacked-die oscillator package includes an oscillator circuit die having inner bond pads, and outer bond pads, and a bulk acoustic wave (BAW) resonator die having a piezoelectric transducer with a first and second BAW bond pad on a same side coupled to a top and bottom electrode layer across a piezoelectric layer. A first metal bump is on the first BAW bond pad and a second metal bump is on the second BAW bond pad flip chip bonded to the inner bond pads of the oscillator circuit die. A polymer material is in a portion of a gap between the BAW and oscillator circuit die.
    Type: Grant
    Filed: January 21, 2020
    Date of Patent: January 12, 2021
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Ricky A. Jackson, Kurt Peter Wachtler
  • Patent number: 10886777
    Abstract: A back-feed protection circuit includes input circuits and a control circuit. Each input circuit includes an input for receiving an input DC voltage. The control circuit is configured to enable one of the first input circuit and the second input circuit having the highest input DC voltage, and disable the other input circuit to substantially prevent current from back feeding to the first input circuit and/or the second input circuit. Each input circuit additionally and/or alternatively includes a positive rail, a reference rail and a plurality of switching devices. A set of the switching devices are coupled in series in the positive rail of each input circuit, and another set of the switching devices are coupled in series in the reference rail of each input circuit. Other example back-feed protection circuits, and electric power supplies including back-feed protection circuits are also disclosed.
    Type: Grant
    Filed: October 14, 2019
    Date of Patent: January 5, 2021
    Assignee: Astec International Limited
    Inventors: Rochie Ligaya Sedillo Libby, Neil Maderas Reyes, Khanderao Madhav Gaikwad
  • Patent number: 10886901
    Abstract: A circuit includes multiple stages cascaded in a ring topology such that each stage has a preceding stage, a succeeding stage, an alternate-preceding stage, and an alternate-succeeding stage. Each stage includes a MOS transistor of a first type, a MOS transistor of a second type and a resistor. The MOS transistor of a first type receives a first input that is output from the preceding stage, and outputs a second output to the alternate-preceding stage. The MOS transistor of a second type receives a second input that is output from the alternate-succeeding stage, and outputs a first output to the succeeding stage. The resistor provides coupling and level-shifting between the first output and the second output.
    Type: Grant
    Filed: February 14, 2020
    Date of Patent: January 5, 2021
    Assignee: REALTEK SEMICONDUCTOR CORP.
    Inventor: Chia-Liang (Leon) Lin
  • Patent number: 10879652
    Abstract: A method of operating a power system includes connecting an external load to a power outlet of the power system while a power switch of the power system is turned off, where the power switch is coupled between a power supply of the power system and the power outlet; measuring one or more electrical characteristics of the external load while the power switch is turned off; determining, based on the measured one or more electrical characteristics of the external load, whether a demagnetization energy of the external load is within a safe operation range for the power system; and in response to determining that the demagnetization energy of the external load is within the safe operation range, turning on the power switch.
    Type: Grant
    Filed: September 21, 2018
    Date of Patent: December 29, 2020
    Assignee: Infineon Technologies AG
    Inventors: Andre Mourrier, Patrick Vaquette
  • Patent number: 10879858
    Abstract: An oscillator circuit uses a comparator, and the oscillator circuit controls charge-discharge of the Miller capacitance between the gate and the drain of a MOSFET serving as an amplifier of the gain unit and the gate capacitance of the MOSFET, and enables the comparator output to follow a relatively high-frequency control signal that is input externally. The oscillator circuit uses a comparator having a differential unit and a gain unit. The oscillator circuit includes a charge-discharge control unit that connects to the output of the differential unit and is configured to control charge-discharge of the Miller capacitance between the gate and the drain of a MOSFET (N2) serving as an amplifier of the gain unit and the gate capacitance of the MOSFET, and an output control unit configured to control the output of the gain unit.
    Type: Grant
    Filed: September 25, 2019
    Date of Patent: December 29, 2020
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Kenji Nakagomi
  • Patent number: 10879843
    Abstract: Embodiments of voltage-controlled oscillators for wireless transmission of data are disclosed herein. In one example, an oscillator circuit includes an active network, a passive differential network coupled to the active network, and a tail tank connected to the active network through a low impedance point of the active network is disclosed. The active network is configured to generate an activating signal for sustaining oscillation of the oscillator circuit. The passive differential network has a first input impedance magnitude peak at a first frequency and a second input impedance magnitude peak at a second frequency. The tail tank circuit has a third input impedance magnitude peak at a third frequency.
    Type: Grant
    Filed: June 3, 2020
    Date of Patent: December 29, 2020
    Assignee: BESTECHNIC (SHANGHAI) CO., LTD.
    Inventors: Tao Zheng, Lu Chai
  • Patent number: 10879908
    Abstract: A method and system are provided for estimating the g-sensitivity of a quartz oscillator, which includes rotating the quartz oscillator successively around each of a plurality of axes constituting a full-rank system, measuring a frequency of the quartz oscillator at a predetermined rate as a function of time during rotation, and estimating an integral g-sensitivity vector while the quartz oscillator is rotated. Estimation can be performed utilizing a data fitting and estimation model, e.g., a Least Square Method (LSM) in one example, using the frequency measurements obtained while the quartz oscillator is in rotation around the axes. The method and system are especially useful for measuring g-sensitivity of quartz oscillators that are incorporated in high-precision systems, such as navigation receivers, which operate in environments that are subjected to vibrational effects and other mechanical forces.
    Type: Grant
    Filed: March 29, 2019
    Date of Patent: December 29, 2020
    Assignee: Topcon Positioning Systems, Inc.
    Inventors: Mark Isaakovich Zhodzishsky, Vladimir Victorovich Beloglazov, Danila Svyatoslavovich Milyutin, Roman Valerievich Kurynin, Vadim Borisovish Kuzmitchev, Sergey Viktorovich Rogachkov
  • Patent number: 10868523
    Abstract: An apparatus is provided to improve lock time of a phase locked loop, wherein the apparatus comprises: a ring oscillator including at least two delay stages, wherein each delay stage has a controllable delay; and a multiphase frequency monitor coupled to the ring oscillator to monitor frequency at an output of at least two delay stages of the ring oscillator.
    Type: Grant
    Filed: June 29, 2018
    Date of Patent: December 15, 2020
    Assignee: Intel Corporation
    Inventors: William Li, Mohsen Nasroullahi, Khoa Nguyen
  • Patent number: 10868495
    Abstract: Some aspects of the present disclosure relate to an apparatus, a PLL and an electronic device. The apparatus comprises a voltage-to-current (V2I) converter, a current controlled oscillator and a compensation current. The V2I converter is operable to receive a first voltage and generate a first current based on the first voltage. The current controlled oscillator is coupled to the V2I converter and operable to generate an oscillation signal based on a second current from or to the V2I converter. The compensation circuit is coupled to the V2I converter and operable to receive a third current from or to the V2I converter. The second and third currents vary in response to at least one of temperature variation and supply voltage variation of the apparatus. Variation direction of the third current is opposite to variation direction of the second current and different frequencies may be provided for a low supply voltage domain.
    Type: Grant
    Filed: June 12, 2019
    Date of Patent: December 15, 2020
    Assignee: LATTICE SEMICONDUCTOR CORPORATION
    Inventors: Kai Lei, Shirley Li, Oliver Wu
  • Patent number: 10855224
    Abstract: A voltage controlled oscillator (VCO) circuit is disclosed. The VCO circuit comprises a VCO tuning circuit comprising a primary inductive coil. In some embodiments, the VCO tuning circuit is configured to generate a VCO output signal at a first resonance frequency. The VCO circuit further comprises a filter circuit comprising a secondary inductive coil. In some embodiments, the filter circuit is configured to resonate at a second, different, resonance frequency, in order to filter a noise associated with the VCO tuning circuit. In some embodiments, the primary inductive coil associated with the VCO tuning circuit and the secondary inductive coil associated with the filter circuit are concentrically arranged with respect to one another. Further, in some embodiments, the primary inductive coil associated with the VCO tuning circuit and the secondary inductive coil associated with the filter circuit are magnetically decoupled with respect to one another.
    Type: Grant
    Filed: March 29, 2019
    Date of Patent: December 1, 2020
    Assignee: Intel Corporation
    Inventors: Sachin Kalia, Satwik Patnaik, Hyung-Jin Lee, Ram Sadhwani
  • Patent number: 10840915
    Abstract: A method of quickly locking a locked loop includes generating an intermediate reference signal having an intermediate reference frequency between a desired output frequency and a reference frequency of a reference signal, and setting an output frequency of a controllable oscillator to the desired output frequency using a first locked loop having a first loop divider value. The first loop divider value is set such that the intermediate reference frequency multiplied by the first loop divider value is equal to the desired output frequency. The controllable oscillator is then coupled to a second locked loop when the first locked loop locks, with the second locked loop is being activated. The first locked loop is then deactivated.
    Type: Grant
    Filed: January 13, 2020
    Date of Patent: November 17, 2020
    Assignee: STMicroelectronics International N.V.
    Inventors: Nitin Gupta, Jeet Narayan Tiwari
  • Patent number: 10840013
    Abstract: A device includes a transformer that further includes a primary and a secondary windings. A switch is coupled to the primary winding, and this switch is controlled by the received digital input signal. An oscillator is further formed on the secondary winding where the oscillator oscillates in response to variations of the received input signal. A detector coupled to the oscillator will then detect the oscillations in response to the variations of the received input signal. Thereafter, the detector generates a digital output based on the detected oscillations.
    Type: Grant
    Filed: May 22, 2018
    Date of Patent: November 17, 2020
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Sreeram Subramanyam Nasum, Tarunvir Singh, Suvadip Banerjee, Kumar Anurag Shrivastava
  • Patent number: 10840921
    Abstract: A method and circuit for linearizing a frequency response of an oscillator controlled by a plurality of capacitor banks are disclosed. In the disclosed method, for each capacitor bank of at least two capacitor banks of the oscillator, a respective sensitivity characteristic of the capacitor bank is determined. Further, a set of reference output frequency control words (FCWs) for an associated set of frequencies of the oscillator are determined. When an input FCW is received and an output FCW is responsively provided based on (i) an interpolation between two reference output FCWs of the set of reference output FCWs and (ii) the respective sensitivity characteristics of the at least two capacitor banks of the oscillator. The output FCW is then applied to the at least two capacitor banks of the oscillator.
    Type: Grant
    Filed: September 7, 2018
    Date of Patent: November 17, 2020
    Assignee: INNOPHASE INC.
    Inventors: Per Konradsson, Yang Xu, Sara Munoz Hermoso
  • Patent number: 10840925
    Abstract: Apparatus and methods demonstrate a chip-scale direct optical to RF link that frequency divides up to 120 GHz optical frequency combs to 10 GHz using harmonic multi-tone injection locking. The embodied invention links widely separated optical frequency combs in the millimeter wave regime (>120 GHz) or THz domain (100s of GHz to THz domain), e.g., microresonator-based frequency combs, which are currently outside of the photo-detection region, into the microwave domain (10s of GHz) where it can be easily photo-detected and controlled. The technique works as a perfect optical divider, using a mode-locked laser and optical injection locking as the technique to phase-lock both lasers.
    Type: Grant
    Filed: May 13, 2019
    Date of Patent: November 17, 2020
    Assignee: UNIVERSITY OF CENTRAL FLORIDA RESEARCH FOUNDATION, INC.
    Inventors: Peter J. Delfyett, Ricardo Bustos Ramirez, Michael E. Plascak
  • Patent number: 10833685
    Abstract: A voltage controlled oscillator (VCO) circuit and method achieves linearized frequency tuning over an extended range of analog tuning voltage by implementing a magnetic balun/transformer for biasing and coupling varactor elements. An active negative transconductance circuit of cross-coupled transistors have drains connected with a resonant tank circuit and at least a first varactor element having ends connected to respective first ends of respective first coils of a respective first and second magnetic balun. Respective second ends of respective first coils of respective first and second baluns are connected to a first reference supply voltage. A second varactor element has ends connecting respective first ends of respective second coils of said first and second baluns. A sinking of a bias current through the resonant tank circuit and the transconductance circuit generates an oscillating signal. A calibration method achieves precise VCO gain over wide tuning voltage range, thereby enhancing VCO linearity.
    Type: Grant
    Filed: June 19, 2019
    Date of Patent: November 10, 2020
    Assignee: International Business Machines Corporation
    Inventors: Sudipto Chakraborty, Rajiv Joshi, Steven J. Holmes, Bruce B. Doris
  • Patent number: 10826505
    Abstract: A hardware device includes a frequency lock loop (FLL) that includes a phase loop filter, and a phase lock loop (PLL) such as an all digital PLL (ADPLL) that includes a frequency loop filter. A controller provides a first control signal to the FLL and a second control signal to the PLL when the device operates the same. The device can also include a digital controlled oscillator (DCO) and part of one or more of the FLL and the PLL. The FLL and the PLL include first and second filters, respectively. The filters are coupled to the DCO. A time-to-digital converter (TDC) and a divider receive an input from the DCO. The controller forms a first loop with the first filter, the TDC, and the divider, and the controller forms a second loop with the second filter, the TDC, and the divider.
    Type: Grant
    Filed: June 24, 2019
    Date of Patent: November 3, 2020
    Assignee: NXP B.V.
    Inventors: Ulrich Moehlmann, Andreas Johannes Köllmann, Christian Scherner