Patents Examined by Fred E Finch, III
  • Patent number: 11515782
    Abstract: A switching control circuit that controls switching of a switching device, the switching control circuit includes a frequency modulation circuit that generates an oscillator signal, and modulates a frequency of an oscillator signal with a predetermined frequency and a modulation index of two or more, and a drive circuit that drives the switching device in response to a signal corresponding to the modulated oscillator signal, the predetermined frequency being higher than a frequency indicative of a value that is a quarter of a half width of a bandpass filter used for measuring noise generated when the switching device is driven.
    Type: Grant
    Filed: September 25, 2020
    Date of Patent: November 29, 2022
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventors: Ryuunosuke Araumi, Ryuji Yamada
  • Patent number: 11487309
    Abstract: The present application discloses a reference voltage generation system and method. The reference voltage generation system includes: a reference voltage generator; and a voltage division circuit coupled to the reference voltage generator. The reference voltage generator is coupled to a reference voltage through the voltage division circuit.
    Type: Grant
    Filed: October 31, 2018
    Date of Patent: November 1, 2022
    Inventor: Xiaoyu Huang
  • Patent number: 11418125
    Abstract: A bidirectional AC power converter, having a front-end comprising parallel sets of three switches in series, which connects multi-phase AC to coupling transformer through a first set of tank circuits, for synchronously bidirectionally converting electrical power between the multi-phase AC and a DC potential, and for converting electrical power between the DC potential to a bipolar electrical signal at a switching frequency, controlled such that two of each parallel set of three switches in series are soft-switched and the other switch is semi-soft switched; the coupling transformer being configured to pass the bipolar electrical power at the switching frequency through a second set of the tank circuits to a synchronous converter, which in turn transfers the electrical power to a secondary system at a frequency different from the switching frequency.
    Type: Grant
    Filed: October 23, 2020
    Date of Patent: August 16, 2022
    Assignee: The Research Foundation for The State University of New York
    Inventors: Kalyan Yenduri, Sunil Dube, Pritam Das
  • Patent number: 11418114
    Abstract: This application discloses a boost power conversion circuit, a method, an inverter, an apparatus, and a system. In the conversion circuit, a voltage control circuit is added on a three-level boost. The voltage control circuit can be connected in series in a third closed loop, and the third closed loop is a loop including an inductor, a first switching transistor, a flying capacitor, a second diode, and an input end. The voltage control circuit clamps a voltage of a common point of the first diode and the second diode when a voltage on an input end of the boost power conversion circuit is less than a startup voltage of the boost power conversion circuit. The voltage borne by the second diode is reduced, so that a diode with relatively small voltage stress can be selected.
    Type: Grant
    Filed: July 24, 2020
    Date of Patent: August 16, 2022
    Inventors: Tao Shi, Jixin Zhu
  • Patent number: 11418131
    Abstract: A voltage balance control method for a flying-capacitor multilevel converter is provided. If the amplitude of the resultant current of the inductor currents from a plurality of output inductors is lower than or equal to a threshold current value, the flowing direction of the inductor current of at least one flying-capacitor multilevel branch circuit is controlled to be changed. Consequently, the problem of erroneously judging the current direction is avoided. Moreover, when the inductor current is low, the voltage of the flying capacitor is correspondingly controlled. Consequently, the voltage balance of the flying capacitor of the flying-capacitor multilevel converter can be achieved more easily.
    Type: Grant
    Filed: December 11, 2020
    Date of Patent: August 16, 2022
    Inventors: Guoqiao Shen, Guojin Xu, Ning He, Jinfa Zhang
  • Patent number: 11411395
    Abstract: An electrostatic discharge protection circuit includes a voltage drop circuit, a detector circuit, and a clamping circuit. The voltage drop circuit is configured to generate a second voltage according to a first voltage. The second voltage is smaller than the first voltage. The detector circuit is coupled to the voltage drop circuit. The detector circuit is configured to generate a control signal according to the second voltage and an input voltage. The clamping circuit is coupled to the voltage drop circuit and the detector circuit. The clamping circuit is configured to provide an electrostatic discharge path according to a voltage level of the control signal.
    Type: Grant
    Filed: November 4, 2019
    Date of Patent: August 9, 2022
    Inventors: Chung-Yu Huang, Tay-Her Tsaur, Po-Ching Lin
  • Patent number: 11394307
    Abstract: Resonant converters with wide voltage gain ranges are achieved by controlling at least one of the primary side resonant circuit and the secondary side rectifier circuit. A switch is included in at least one of the primary or secondary sides, and control of the switch according to a selected mode determines an output voltage of the resonant converter. Embodiments accommodate wide input and output voltage ranges, and are suitable for use in AC-DC power adapters for portable devices with different voltage requirements, such as cell phones, tablets, and notebook computers, as well as in DC-DC converter applications including electric vehicle power systems.
    Type: Grant
    Filed: January 28, 2019
    Date of Patent: July 19, 2022
    Assignee: Queen's University at Kingston
    Inventors: Yang Chen, Yan-Fei Liu
  • Patent number: 11394304
    Abstract: A power supply may include a power block to receive an input power and generate an output power; and a control system coupled to the power block, wherein the power block and control system are arranged to provide unidirectional current flow and bipolar voltage during operation of the power supply.
    Type: Grant
    Filed: February 19, 2020
    Date of Patent: July 19, 2022
    Assignee: ESAB AB
    Inventor: Andrzej Mnich
  • Patent number: 11381155
    Abstract: An overvoltage protection circuit includes an error amplifier, which outputs a first command voltage for bringing the output voltage of a converter closer to a first set voltage, and an overvoltage detection circuit, which outputs a second command voltage for bringing the output voltage of the converter closer to a second set voltage that is higher than the first set voltage. The overvoltage protection circuit controls the converter based on the first command voltage and the second command voltage. Noise immunity can be guaranteed even when an overvoltage detection level is set lower than the level of disturbance noise.
    Type: Grant
    Filed: April 30, 2020
    Date of Patent: July 5, 2022
    Inventors: Masatoshi Kutsukake, Akira Moriyama
  • Patent number: 11368096
    Abstract: A control method includes the steps of: setting first control periods of a switching transistor group, the first control periods including operating periods in the first driving mode and operating periods in the second driving mode; setting an output voltage and a K value in a directly proportional relationship, wherein the K value is the ratio of the number of the operating periods in the second driving mode to the number of the operating periods in the first driving mode; receiving the output voltage, and determining a K value corresponding to the existing output voltage according to the set relationship between the output voltage and the K value; and outputting a driving signal group of the switching transistor group according to the number of the operating periods in the first driving mode and the number of the operating periods in the second driving mode.
    Type: Grant
    Filed: June 19, 2020
    Date of Patent: June 21, 2022
    Inventor: Zhaoqi Mao
  • Patent number: 11362581
    Abstract: The present disclosure provides a starter circuit for energy harvesting circuits for an energy source having a first and a second potential of an input voltage, in particular for thermoelectric generators.
    Type: Grant
    Filed: August 12, 2020
    Date of Patent: June 14, 2022
    Inventor: Harald Dillersberger
  • Patent number: 11362507
    Abstract: Systems, methods, techniques and apparatuses of ground fault protection are disclosed. One exemplary embodiment is a power switch being structured to receive a load current from a power source at a source-side and selectively output the load current from a load-side to a load; a first voltage measuring device structured to measure a first voltage of the source-side while the power switch is conducting the load current; a second voltage measuring device structured to measure a second voltage of the load-side while the first voltage measuring device is measuring the first voltage; and a controller structured to determine a source-side-to-ground voltage based on the first voltage, determine a load-side-to-ground voltage based on the second voltage, determine a ground fault is occurring, and determine a direction of the ground fault relative to the power switch by comparing the source-side-to-ground voltage and the load-side-to-ground voltage.
    Type: Grant
    Filed: August 6, 2020
    Date of Patent: June 14, 2022
    Assignee: ABB SCHWEIZ AG
    Inventors: Thomas Kendzia, III, Veerakumar Bose
  • Patent number: 11355911
    Abstract: The present invention relates to a power supply circuit (400) for a breaking circuit (100), the power supply circuit (400) comprising a first connecting point (CP1) arranged to be connected to an input (102) of the breaking circuit (100) and a second connecting point (CP2) arranged to be connected to an output (104) of the breaking circuit (100).
    Type: Grant
    Filed: December 22, 2017
    Date of Patent: June 7, 2022
    Assignee: Blixt Tech AB
    Inventors: Jan Johansson, Henrik Borg
  • Patent number: 11356025
    Abstract: System and method for protecting a power converter. The system includes a first comparator configured to receive a first threshold signal and a first signal and to generate a first comparison signal. The first signal is associated with an input current for a power converter. Additionally, the system includes a second comparator configured to receive a second threshold signal and the first signal and to generate a second comparison signal. The second threshold signal is different from the first threshold signal in magnitude. Moreover, the system includes a first detection component configured to receive at least the second comparison signal, detect the second comparison signal only if one or more predetermined conditions are satisfied, and generate a first detection signal based on at least information associated with the detected second comparison signal.
    Type: Grant
    Filed: September 18, 2017
    Date of Patent: June 7, 2022
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Dongze Yang, Yaming Cao, Yunchao Zhang, Lieyi Fang
  • Patent number: 11349412
    Abstract: A three-phase AC control apparatus includes: an equal duty sensing circuit; and a PWM signal control circuit. The equal duty sensing circuit senses whether any two of a U-phase, a V-phase, and a W-phase of a three-phase AC current have an equal duty value. The PWM signal control circuit outputs, when it is sensed that any two of the U-phase, the V-phase, and the W-phase of the three-phase AC current have the equal duty value, a control signal that shifts a timing of start and a timing of stop of one of the two phases having the equal duty value.
    Type: Grant
    Filed: December 12, 2019
    Date of Patent: May 31, 2022
    Inventors: Takashi Ogawa, Takayuki Jinno, Yoshiaki Okuno
  • Patent number: 11349400
    Abstract: A multiple parallel-connected resonant converter, an inductor-integrated magnetic element and a transformer-integrated magnetic element are provided. The multiple parallel-connected resonant converter includes a first and a second converters. The first converter having a first input and output end includes a first inductor, a first transformer and a first capacitor connected in series. The second converter having a second input and output end includes a second inductor, a second transformer and a second capacitor connected in series. The second output end is connected with the first output end in parallel. The first and second inductor are integrated in a first magnetic element, the first magnetic element includes a first and second side column, and a first and second central column. The first inductor includes a first coil positioned around the first central column and the second inductor includes a second coil positioned around the second central column.
    Type: Grant
    Filed: June 24, 2019
    Date of Patent: May 31, 2022
    Assignee: Delta Electronics (Shanghai) CO., LTD
    Inventors: Haijun Yang, Zengyi Lu, Weilong Xia, Yajiang Yan
  • Patent number: 11349310
    Abstract: Transients occur on power transmission lines for unpredictable reasons including breakers opening and closing, load variations, and inputs to the grid from renewable energy sources turning on and off. A recursive technique allows a linear function to be fitted to a non-linear grid dynamic of the power line transients. The technique is adaptive and helps to stabilize an impedance injection unit while it injects correcting impedance into a transmission line for the purpose of achieving power flow control. When applied to many injection units the technique may also help to stabilize the overall grid. The stabilization system using the recursive technique provides real-time monitoring of the associated power line and stabilization with respect to power line transients.
    Type: Grant
    Filed: July 1, 2020
    Date of Patent: May 31, 2022
    Assignee: Smart Wires Inc.
    Inventors: Niloofar Torabi, Haroon Inam
  • Patent number: 11349397
    Abstract: The present invention discloses a method and an apparatus for controlling a flyback converter, the flyback converter including a main switch, a transformer, and an auxiliary switch. The method includes: obtaining a first voltage signal and a second voltage signal, the first voltage signal representing an input voltage of the flyback converter, and the second voltage signal representing an output voltage of the flyback converter; controlling turn-on of the auxiliary switch, wherein the turn-on time period of the auxiliary switch is determined according to the first voltage signal and the second voltage signal; and turning on the main switch at ZVS condition, wherein the main switch is turned on at the time delayed for a duration of a dead time after turning off of the auxiliary switch.
    Type: Grant
    Filed: August 31, 2020
    Date of Patent: May 31, 2022
    Assignee: Delta Electronics (Shanghai) Co., Ltd.
    Inventors: Haibin Song, Daofei Xu, Jinfa Zhang
  • Patent number: 11349384
    Abstract: Methods of energizing converters, and converter stations thereof, based on a mix of half-bridge (HB) converter cells and full-bridge (FB) converter cells are provided. According to one embodiment, a method for energizing a converter may include establishing a direct electrical connection between DC terminals of a converter, electrically connecting the converter to an AC power source via AC connectors and obtaining, from the AC power source and for a certain period of time, an AC voltage between two electrical phase lines for charging capacitors of the FB cells connected to the two electrical phase lines. Accordingly, the FB cells will be charged to a higher value and they may be controlled for charging capacitors of the HB submodules to at least a minimum voltage required to start switching devices of the HB submodules by drawing power from the AC power source.
    Type: Grant
    Filed: February 23, 2018
    Date of Patent: May 31, 2022
    Assignee: Hitachi Energy Switzerland AG
    Inventors: Praveen Kumar Barupati, Ying Jiang-Häfner
  • Patent number: 11342841
    Abstract: The present disclosure includes by controlling at least either one of a switching frequency of a switching element (S) or a duty ratio indicating an ON period of the switching element, securing delay time from voltage at both ends of the switching element reaches zero voltage by resonance of the resonant circuit (L0, C0) in an OFF state of the switching element until the switching element is turned on, and turning on the switching element within the delay time.
    Type: Grant
    Filed: March 7, 2018
    Date of Patent: May 24, 2022
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Toshihiro Kai, Shigeharu Yamagami, Tetsuya Hayashi, Yusuke Zushi, Taku Shimomura