Patents Examined by LaKaisha Jackson
  • Patent number: 10432098
    Abstract: A synchronous rectifier controller includes an exception timer, one or more blanking timers, and control logic. The control logic may detect a beginning of a conduction phase using a current sense signal. In response to detecting the beginning of the conduction phase, the control logic commences the exception timer, commences a first blanking interval, and asserts the drive signal. In response to an OFF condition being detected, the first blanking interval being elapsed, and the exception timer being running, the control logic de-asserts the drive signal and commences a second blanking interval. In response to an ON condition being detected, the second blanking interval being elapsed, and the exception timer being running, the control logic commences a third blanking interval and asserts the drive signal. The control logic may assert and de-assert the drive signal multiple times while the exception timer is running.
    Type: Grant
    Filed: July 19, 2018
    Date of Patent: October 1, 2019
    Inventors: Karel Ptacek, Tomas Tichy
  • Patent number: 10404154
    Abstract: A multi-level inverter having one or more banks, each bank containing a plurality of low voltage MOSFET transistors. A processor configured to switch the plurality of low voltage MOSFET transistors in each bank to switch at multiple times during each cycle.
    Type: Grant
    Filed: February 26, 2016
    Date of Patent: September 3, 2019
    Assignee: Solaredge Technologies Ltd
    Inventors: Ilan Yoscovich, Tzachi Glovinsky, Guy Sella, Yoav Galin
  • Patent number: 10404186
    Abstract: A power module includes an input bus, a switching device, and an output bus. The input bus includes a first coating of a high permeability magnetic conductive material and is configured to receive input direct current (DC) electrical power from an electrical power source. The switching device is electrically coupled to the first input bus, and is configured to selectively connect and disconnect to facilitate converting the input DC electrical power into output alternating current (AC) electrical power. The output bus includes a second coating of the high permeability magnetic conductive material, and is electrically coupled to the first switching device. The output bus is configured to supply the output AC electrical power to an electrical load.
    Type: Grant
    Filed: October 27, 2016
    Date of Patent: September 3, 2019
    Inventors: Michael Joseph Schutten, Fengfeng Tao, Maja Harfman-Todorovic, Ravisekhar Nadimpalli Raju, Philip Michael Cioffi, Ljubisa Dragoljub Stevanovic
  • Patent number: 10404157
    Abstract: An AC-DC conversion device that includes a major circuit portion and a control circuit is provided. The major circuit portion includes a converter in which multiple switch portions in a bridge connection include separately-excited switching elements and snubber circuits connected in parallel with the switching elements; and the major circuit portion is connected to an alternating current power supply and a direct current circuit and applies, to the direct current circuit, an alternating current voltage applied from the alternating current power supply by an ON of the multiple switch portions. The control circuit controls the voltage applied to the direct current circuit by controlling the ON timing of the multiple switch portions by inputting a control pulse to each of the multiple switch portions.
    Type: Grant
    Filed: January 7, 2016
    Date of Patent: September 3, 2019
    Inventors: Keisuke Hattori, Teruo Yoshino, Tomohisa Okami
  • Patent number: 10396686
    Abstract: A converter comprises a plurality of controllable two-pole sub-modules connected in series. At least some of the sub-modules each comprises a first and a second sub-module connection, a first, a second, a third and a fourth controllable switch, and a storage dipole, which comprises a first and a second dipole connection, an energy store and a controllable switching device, wherein the controllable switching device has a first selectable switching state, in which the storage dipole outputs no energy, and a second selectable switching state, in which the store of the storage dipole can take up or discharge energy. The sub-module has a selectable conduction state, in which the controllable switching device of the storage dipole assumes the first switching state and the first to fourth switches are switched such that a current flows through the sub-module on two parallel branches.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: August 27, 2019
    Inventor: Rainer Marquardt
  • Patent number: 10396667
    Abstract: There is provided a DC-DC converter which is safe and secure, but yet with low power consumption. The DC-DC converter is configured such that an overcurrent protection circuit is operated intermittently only for a predetermined period of time based on a signal output from an output control circuit to turn on a switching element.
    Type: Grant
    Filed: April 26, 2017
    Date of Patent: August 27, 2019
    Assignee: ABLIC INC.
    Inventors: Akihiro Kawano, Katsuya Goto
  • Patent number: 10381926
    Abstract: A digitally compensated hysteretic power supply with enhanced resolution is provided. Such a power supply includes a comparator that is used to compare a load current sense signal with an internal signal generated from a digital-to-analog converter (DAC). A compensation circuit at a DAC input operates to improve current accuracy beyond the given DAC resolution. The current sense signal is converted to its digital equivalent, which is fed to a proportional-integral (PI) compensation loop, which in turn generates a relatively precise high resolution DAC input value. The DAC uses the higher part of the DAC value. The lower part of the DAC value is treated as a duty cycle number, and the DAC output is toggled between two levels at this duty cycle. This toggling generates a current output signal having a value that is the average of the two toggled values.
    Type: Grant
    Filed: September 24, 2015
    Date of Patent: August 13, 2019
    Assignee: OSRAM SYLVANIA Inc.
    Inventors: Peng Xiao, Markus Ziegler
  • Patent number: 10381953
    Abstract: A bidirectional bridgeless buck-boost power converter circuit is provided that can function as both a voltage source inverter (VSI) circuit to transform direct current (DC) voltage to alternating current (AC) voltage and as a power factor corrector (PFC) circuit to transform AC voltage to DC voltage. The disclosed converter fully utilizes inductors to form a CL filter and buck-boost converter energy storage element. Thus, low inductance chokes are used in the converter, which leads to a higher power density and is more cost-effective. Further, the bridgeless configuration minimizes conduction losses of semiconductors, and coupled with the use of low inductance chokes this improves system efficiency.
    Type: Grant
    Filed: October 26, 2017
    Date of Patent: August 13, 2019
    Assignee: The University of Manitoba
    Inventors: Ngai Man Ho, King Man Siu
  • Patent number: 10374504
    Abstract: A power unit includes: a plurality of power converters, a first output terminal of one of two adjacent power converters among the plurality of power converters is connected successively to a second output terminal of the other one of the two adjacent power converters; a local controller configured to output a plurality of control signals; and a plurality of driving circuits configured to output driving signals according to the plurality of control signals, to drive the plurality of power semiconductor switches to be turned on and off, wherein the control signals corresponding to the power semiconductor switches in the same position of the plurality of power converters are the same, the power semiconductor switches in the same position of the plurality of power converters are simultaneously turned on and off.
    Type: Grant
    Filed: September 19, 2017
    Date of Patent: August 6, 2019
    Assignee: Delta Electronics (Shanghai) CO., LTD
    Inventors: Jianping Ying, Ming Wang, Xiaobo Huang, Jun Liu
  • Patent number: 10374519
    Abstract: The present disclosure discloses an LLC resonant converter and a method for suppressing ripples in output voltage of the LLC resonant converter. The LLC resonant converter comprises: a half-bridge or full-bridge chopper having a driving circuit, an inductance-capacitance series resonant network coupled to the chopper, an isolation transformer coupled to the resonant network, and a rectification and filtering circuit coupled to the isolation transformer; a feedforward controller coupled to generate a feedforward signal based on an input voltage; and a controlled oscillator coupled to receive the feedforward signal from the feedforward controller and to control an operating frequency of the chopper via the driving circuit based on the feedforward signal. Thus, a feedforward correction is provided for the LLC resonant converter, so that ripples in a DC output voltage of the LLC resonant converter are reduced.
    Type: Grant
    Filed: June 17, 2016
    Date of Patent: August 6, 2019
    Assignee: Astec International Limited
    Inventors: Shi Jie Deng, Qing Feng Liu, Guang Quan Li, Zhao Fu Zhou, Zhao Tu Fan
  • Patent number: 10348190
    Abstract: Duties of control for DC/AC and DC/DC conversion units are determined by considering electric influences of a filter circuit, a capacitor connected to a DC bus, and a DC reactor for an output voltage command value for supplying an AC voltage to a load. The DC/DC conversion unit is controlled to convert a DC voltage into a DC bus voltage waveform alternately having a period of a pulsating current waveform corresponding to the absolute value of the AC voltage and a period of the DC voltage as a pulsating current minimum value. The DC/AC conversion unit is controlled to perform step-down operation during the period of the DC voltage and thus perform conversion into a waveform of the absolute value of the AC voltage corresponding to the period of the DC voltage, and also to perform polarity inversion per one pulsating current cycle.
    Type: Grant
    Filed: April 4, 2016
    Date of Patent: July 9, 2019
    Inventors: Yusuke Shimizu, Tetsuo Akita, Toshiaki Okumura, Naoki Ayai
  • Patent number: 10348187
    Abstract: The present invention realizes a DC-DC converter that is provided with a reverse flow protection function, while reducing conduction loss. A DC-DC converter includes: a voltage conversion unit that steps down a voltage applied to a first conductive path and output the resulting voltage to a second conductive path; a reverse flow state detection unit that detects a reverse flow state of a current flowing through the second conductive path; and a reverse protection control unit that performs a protecting operation when a current flows in a reverse direction. A switching element is provided on a third conductive path that is located between a voltage conversion unit and a reference conductive path, and the reverse protection control unit operates to switch the switching element to an OFF state upon a reverse flow state being detected.
    Type: Grant
    Filed: December 8, 2016
    Date of Patent: July 9, 2019
    Assignees: AutoNetworks Technologies, Ltd., Sumitomo Wiring Systems, Ltd., Sumitomo Electric Industries, Ltd.
    Inventors: Takashi Igarashi, Byeongsu Jeong, Kazuki Masuda, Takanori Itou, Seiji Takahashi
  • Patent number: 10340805
    Abstract: The present invention relates to a resonant step-down DC-DC power converter which comprises a primary side circuit and a secondary side circuit coupled through a galvanic isolation barrier. The primary side circuit comprises a positive and a negative input terminal for receipt of an input voltage and an input capacitor coupled between the positive and negative input terminals and the secondary side circuit comprises an output capacitor chargeable to a converter output voltage between a first positive electrode and a second negative electrode. A resonant network is con-figured for alternatingly being charged from the input voltage and discharged to the output capacitor through the galvanic isolation barrier by a semiconductor switch arrangement in accordance with a switch control signal to produce the converter output voltage.
    Type: Grant
    Filed: January 20, 2015
    Date of Patent: July 2, 2019
    Assignee: Danmarks Tekniske Universitet
    Inventors: Milovan Kovacevic, Mickey P. Madsen
  • Patent number: 10338625
    Abstract: A voltage regulation system for providing power to a load is provided. The voltage regulation system includes a voltage regulator operable to: set an operating voltage of the load at a first voltage level which corresponds to a first voltage requirement of the load; receive a second voltage requirement of the load which is different than the first voltage requirement; produce a voltage ramp signal which transitions from the first voltage level to a second voltage level which corresponds to the second voltage requirement at a defined ramp rate; and ramp the operating voltage from the first voltage level to the second voltage level based on the voltage ramp signal and at the same ramp rate as the voltage ramp signal, but with a lag between the voltage ramp signal and the ramp in the operating voltage.
    Type: Grant
    Filed: December 28, 2017
    Date of Patent: July 2, 2019
    Assignee: Infineon Technologies Austria AG
    Inventors: Amir Babazadeh, Benjamim Tang, Jinghong Guo, Tim Ng, Scott Southwell, Richard Pierson, Nick Steffen
  • Patent number: 10312821
    Abstract: A rectifier cell includes a first cell branch and a second cell branch that extend in parallel between two opposite nodes receiving an a.c. signal. The first cell branch includes a first pair of transistors arranged with their current paths cascaded, with a first intermediate point in-between. The second cell branch includes a second pair of transistors arranged with their current paths cascaded, with a second intermediate point in-between. Each of the pairs of transistors includes a first transistor with a control terminal coupled to one of the two opposite nodes and a second transistor with a control terminal coupled to the other of the two opposite nodes. The bulks of the transistors receive voltages in order to vary the transistor threshold voltage by bringing the threshold voltage to a first value during forward conduction and to a second value during reverse conduction.
    Type: Grant
    Filed: November 22, 2016
    Date of Patent: June 4, 2019
    Assignee: STMicroelectronics S.r.l.
    Inventors: Leandro Grasso, Ranieri Guerra, Giuseppe Palmisano
  • Patent number: 10305274
    Abstract: The present invention is concerned with pre-magnetizing a Modular Multilevel power Converters connected transformer in order to moderate inrush currents upon connecting the transformer to an electric grid. The invention takes advantage of the high amount of stored energy in MMC converters as compared to other converter types. This stored energy is used to pre-magnetize the converter-connected transformer, therefore no additional or dedicated pre-magnetizing hardware is required in addition to the charging hardware provided to charge the converter capacitors. As the transformer pre-magnetizing takes place subsequent to the converter charging, the converter charging circuit is not used to, and therefore does not need to be designed to, directly magnetize the transformer.
    Type: Grant
    Filed: April 17, 2017
    Date of Patent: May 28, 2019
    Inventor: Robert Turner
  • Patent number: 10291143
    Abstract: A long-life intelligent step-down conversion device includes a high-frequency modulation unit including a first switching tube and a second switching tube, an inductance filtering unit including a filtering inductor, and an inverting paraphase unit. The drain of the first switching tube is connected to a DC voltage, its source connects to the drain of the second switching tube, and the source of the second switching tube is carthed. The grids of the first and second switch tubes are respectively connected to two-path anti-phased PWM pulse signals. The front end of the filtering inductor is connected to the source of the first switching tube. The inverting paraphase unit, with its input terminal connected to the back end of the filtering inductor, is configured for invertedly converting a half-wave pulse voltage output from the back end of the filtering inductor to a sine AC voltage. Which of easy to carry, without electrolytic capacitors, improving the service life, avoiding interference to the power grid.
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: May 14, 2019
    Inventors: Zhigang Liao, Tao Hou
  • Patent number: 10291134
    Abstract: The anti-windup circuit generally has a voltage clamping device in series with a current limiting device operatively connectable to the output current path of a feedback compensator; the feedback compensator being part of a switch-mode power supply (SMPS) having an input voltage source and a load and generating constrained control values required to generate control on-off actions for tight power regulation. The inclusion of the disclosed anti-windup circuit in an SMPS may lead to hardware based overvoltage protection, reduced overall size and faster response to load changes.
    Type: Grant
    Filed: August 29, 2016
    Date of Patent: May 14, 2019
    Assignee: Silanna Asia Pte Ltd
    Inventor: Aleksandar Radic
  • Patent number: 10291127
    Abstract: Methods and circuits for controlling a synchronous rectifier. An operating condition of the synchronous rectifier is detected. A voltage level applied to turn on at least one transistor of the synchronous rectifier us modified based upon the detected operating condition, to improve efficiency of the synchronous rectifier.
    Type: Grant
    Filed: January 27, 2016
    Date of Patent: May 14, 2019
    Assignee: MediaTek Inc.
    Inventors: Hasnain Akram, Patrick Stanley Riehl
  • Patent number: 10284103
    Abstract: A power converter includes first and second DC terminals between which the power converter is operable to generate a voltage difference. The power converter also includes a control unit that is configured to operate in a normal mode during normal operation of the power converter and in a fault mode when a fault occurs in a respective DC power transmission medium that is operatively connected in use to one of the first or second DC terminals. The control unit in the normal mode generates a normal operating voltage difference between the first and second DC terminals. The control unit in the fault mode generates a modified operating voltage difference between the first and second DC terminals while maintaining the respective voltage potential with respect to earth of the other of the first and second DC terminals. The modified operating voltage difference is lower than the normal operating voltage difference.
    Type: Grant
    Filed: July 24, 2014
    Date of Patent: May 7, 2019
    Inventor: Carl David Barker