Transistor Patents (Class 363/127)
  • Patent number: 10734825
    Abstract: A respiratory device, such as a ventilator, for use in treating respiratory disorders and for preventing respiratory disorders. The respiratory device is configured to be powered from a range of different power sources including an internal battery, an external battery, AC power source or a DC power source. The device may be electrically connectable to a plurality of external batteries in a series and the power from each external battery is used sequentially along the series. A controller of the respiratory device is configured to detect the connection of the different power sources and control use of the different power sources using a power priority scheme. The controller may determine an estimate of the total available battery capacity from all the electrically connected batteries and display the total battery capacity on a user interface display of the device.
    Type: Grant
    Filed: June 19, 2019
    Date of Patent: August 4, 2020
    Assignee: ResMed Paris SAS
    Inventors: Alex Crawford Wing, Christopher Kingsley Blunsden, Korn Sar, David Creusot
  • Patent number: 10727769
    Abstract: An electric power system (EPS) may comprise a permanent magnet synchronous generator (PMSG), a high speed rectifier configured to receive a first alternating current (AC) power from the PMSG, and a low speed rectifier configured to receive a second AC power from the PMSG. The low speed rectifier may be configured to receive the first AC power in response to the PMSG rotating at a first rotational speed, and the high speed rectifier may be configured to receive the second AC power in response to the PMSG rotating at a second faster rotational speed.
    Type: Grant
    Filed: September 22, 2017
    Date of Patent: July 28, 2020
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Gregory I. Rozman, Jacek F. Gieras, Steven J. Moss, Mohammad Shahamat
  • Patent number: 10666154
    Abstract: A DC to DC converter with intermediate conversion into AC power, including: a transformer having a primary winding and a secondary winding; a first DC to AC conversion circuit having its AC terminals coupled with the primary winding of the transformer; a first AC to DC conversion circuit having its AC terminals coupled across a first tap and a second tap of the secondary winding of the transformer; a second AC to DC conversion circuit having its AC terminals coupled across a third tap and a fourth tap of the secondary winding of the transformer, wherein the first tap and the second tap are arranged between the third tap and the fourth tap along the secondary winding of the transformer; and at least one first power switch, being arranged between one of DC terminals of the first AC to DC conversion circuit and one of DC terminals of the second AC to DC conversion circuit. By having the solution as above, the DC output voltage may be changed between two levels by operating only one power switch.
    Type: Grant
    Filed: May 31, 2019
    Date of Patent: May 26, 2020
    Assignee: ABB Schweiz AG
    Inventors: Dawei Yao, Xiaobo Yang, Guoxing Fan, Sheng Zong
  • Patent number: 10658917
    Abstract: A sense terminal is configured to sense a drain-to-source voltage of a field effect transistor and a drive terminal is configured to drive the gate terminal of the field effect transistor to alternatively turn the field effect transistor on and off to provide a rectified current flow in the field effect transistor channel. A comparator is configured to perform a comparison of the drain-to-source voltage of the field effect transistor with a reference threshold and to detect alternate downward and upward crossings of the reference threshold and the drain-to-source voltage. A PWM signal generator is configured to drive the gate terminal of the field effect transistor to turn the field effect transistor on and off as a result of the alternate downward and upward crossings of the reference threshold by the drain-to-source voltage.
    Type: Grant
    Filed: April 1, 2019
    Date of Patent: May 19, 2020
    Assignee: STMicroelectronics S.R.L.
    Inventor: Ivan Clemente Massimiani
  • Patent number: 10658928
    Abstract: Various examples are provided related to switched-capacitor converters (SCCs) with multi resonant frequencies. In one example, a multi resonant SCC (MRSCC) includes a series of switches coupled between an input voltage and an output connection; a pair of diodes coupled across the output connection; and a resonant circuit coupled at a first end between first and second switches of the series of switches and at a second end between the pair of diodes. The resonant circuit can comprise a resonant tank including a first capacitor and a resonant inductor, and a resonant component in parallel with at least a portion of the resonant tank. The resonant component can be connected across the resonant tank or across the resonant inductor. The MRSCC topology can also be used with higher voltage conversion ratio converters.
    Type: Grant
    Filed: April 1, 2019
    Date of Patent: May 19, 2020
    Assignee: Virginia Tech Intellectual Properties, Inc.
    Inventors: Owen Jong, Qiang Li, Fred C. Lee
  • Patent number: 10622908
    Abstract: In described examples, an isolated DC-DC converter includes an input node for receiving an input voltage, and a transformer including a primary side having first and second terminals and a ground. First and second high-side switches are coupled between the input node and the first and second terminals, respectively. A first low-side switch is coupled between the first terminal and the ground, and through a first voltage limiter to be activated by a voltage at the second terminal. A second low-side switch is coupled between the second terminal and the ground, and through a second voltage limiter to be activated by a voltage at the first terminal. A switch controller controls the high-side switches so that voltages across the high-side switches are alternatingly zero, using a current through the primary side to alternatingly charge one terminal to an input voltage and discharge the other terminal to a ground voltage.
    Type: Grant
    Filed: December 29, 2017
    Date of Patent: April 14, 2020
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Maurizio Granato, Giavanni Frattini, Shailendra Kumar Baranwal
  • Patent number: 10615711
    Abstract: The present invention relates to an apparatus for controlling an output voltage for a single-type converter and a method therefor, the apparatus including: a power input/output unit connected in parallel to both poles of the single-type converter, respectively, thereby receiving and outputting output voltages, respectively; an output voltage and current measurement unit measuring output currents and the output voltages output from the power input/output unit; a controller performing a current limit control for a protection coordination for a first pole and performing a voltage control for a second pole following a checking of a state of the first pole of the both poles of the single-type converter using the measured output currents; a switching unit being switched according to a control performed on the both poles; and a power transfer unit transferring the output voltages of the single-type converter according to switching of the switching unit.
    Type: Grant
    Filed: November 11, 2016
    Date of Patent: April 7, 2020
    Assignee: KOREA ELECTRIC POWER CORPORATION
    Inventors: Jin-Tae Cho, Ju-Yong Kim, Jae-Han Kim, Young-Pyo Cho
  • Patent number: 10615700
    Abstract: A power converter includes a transformer, a first primary side transistor coupled to the primary winding, a primary side controller that provides a gate signal to a gate of the first primary side transistor, a first synchronous rectifier (SR) transistor, and an SR controller. The first SR transistor has a drain coupled to a secondary winding of the transformer, a gate for receiving a first SR gate signal, and a source coupled to a first output terminal of the power converter. The SR controller is coupled to the gate and drain of the first SR transistor, for activating the first SR gate signal when a voltage on the drain falls below a turn-on threshold, and deactivating the first SR gate signal when a voltage on the drain rises above a variable turn-off threshold, wherein the variable turn-off threshold increases over an expected on-time of the first SR gate signal.
    Type: Grant
    Filed: January 21, 2019
    Date of Patent: April 7, 2020
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Sangcheol Moon, JooHoon Kim, Inki Park
  • Patent number: 10608522
    Abstract: An electrical circuit comprising an n-port m-phase active bridge converter with n?2 and m?1, where each port can be operated as an input or an output port, wherein each of the n ports has m phase legs with multiple active switches with parallel connected snubber or resonant capacitors, whereby the n ports can convert a DC-voltage into an AC voltage, the n ports connected via an m-phase transformer or over m separate transformers each connected to each of the m phase legs of each of the n ports to transfer power between the ports, wherein an auxiliary circuit is connected to the transformers to convert a part of a transformer input voltage and energy via an auxiliary voltage source into a DC mid-point capacitor of a DC-link of at least one of the n-port m-phase active bridge converters to recharge the DC mid-point capacitor.
    Type: Grant
    Filed: June 28, 2019
    Date of Patent: March 31, 2020
    Assignee: Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen
    Inventors: Rik W. De Doncker, Johannes Voss
  • Patent number: 10608570
    Abstract: A boosting operation of a converter and the intermittent energization operation of an inverter are optimally performed in accordant with input or output. The power converter includes the converter capable of boosting a DC voltage outputted by switching operation alternately performing shorting and rectification; the inverter; an inverter capable of performing intermittent energization in which switching around zero cross of a motor current is turned off upon converting the DC voltage outputted by the converter into three-phase AC power; and a controller that controls the converter to perform boosting operation and the inverter to perform the boosting operation of the converter and the intermittent energization operation of the inverter linkingly.
    Type: Grant
    Filed: October 18, 2017
    Date of Patent: March 31, 2020
    Assignee: Hitachi-Johnson Controls Air Conditioning, Inc.
    Inventors: Yoji Ogura, Kazuhiro Ueta, Kenji Tamura, Wataru Hatsuse
  • Patent number: 10601331
    Abstract: An AC-to-DC converter circuit includes DC-to-DC converter that in turn includes a secondary side circuit. The secondary side circuit includes a secondary winding, a pair of bipolar transistor-based self-driven synchronous rectifiers, a pair of current splitting inductors, and an output capacitor. Each of the synchronous rectifiers includes a bipolar transistor and a diode whose anode is coupled to the transistor collector and whose cathode is coupled to the transistor emitter. The current splitting inductors provide the necessary base current to the bipolar transistors at the appropriate times such that the bipolar transistors operate as synchronous rectifiers.
    Type: Grant
    Filed: November 30, 2015
    Date of Patent: March 24, 2020
    Assignee: Littlefuse, Inc.
    Inventor: Kyoung Wook Seok
  • Patent number: 10594224
    Abstract: A two-terminal rectifier includes a power MOSFET, a body diode, and a Schottky diode coupled between the first terminal and the second terminal. The two-terminal rectifier also has a power management circuit, a capacitor, a control circuit, and a driver circuit coupled between the first terminal and the second terminal. The two-terminal rectifier can be implemented in a two-pin package and can be used in a power converter for CCM operation.
    Type: Grant
    Filed: May 29, 2018
    Date of Patent: March 17, 2020
    Assignee: DIODES INCORPORATED
    Inventors: Pin-Hao Huang, Chengfu Chang, Chuante Liu
  • Patent number: 10594203
    Abstract: The present invention relates to a system for the conversion of DC electric power into three-phase electric power comprising three commutation arms (A, B, C), a modulation circuit, an electrical energy recovery module (8) and filtering means (7). The filtering means (7) comprise a capacitor (Cf) and an assembly formed from a filtering coil (Lf) connected in series with a diode (D).
    Type: Grant
    Filed: June 16, 2017
    Date of Patent: March 17, 2020
    Assignee: IFP Energies nouvelles
    Inventors: Marco Francessetti, Davide Bettoni, Wissam Dib
  • Patent number: 10594229
    Abstract: In a powered device (PD), four MOSFETs are used in a rectifier circuit. The four MOSFETs are disposed based on a premise that an electric potential of a contact pair 1-2 is lower than that of a contact pair 3-6 and an electric potential of a contact pair 7-8 is lower than that of a contact pair 4-5, so that a PoE current of each contact group passes through only two of the MOSFETs but does not pass through a diode.
    Type: Grant
    Filed: May 29, 2019
    Date of Patent: March 17, 2020
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Jincan Cao, Xuefeng Tang
  • Patent number: 10554136
    Abstract: A secondary controller including a control circuit coupled to a secondary switch of a power converter. The control circuit is coupled to receive a secondary switch voltage signal representative of the secondary switch, and turns ON the secondary in response in response to how many times the secondary switch voltage signal crosses below a turn on threshold to a limit set in a last half period. The control circuit turns OFF the secondary switch when the secondary switch voltage signal crosses above a turn off threshold.
    Type: Grant
    Filed: August 3, 2018
    Date of Patent: February 4, 2020
    Assignee: Power Integrations, Inc.
    Inventor: Igor Miletic
  • Patent number: 10547249
    Abstract: A bridge circuit includes: a first leg including a first switching device and a second switching device connected between a first node and a ground; a second leg including a third switching device and a fourth switching device connected between the first node and the ground; and a first charge recycler connected between a gate of the first switching device and a gate of the third switching device, and configured to transfer charges accumulated in the first switching device to the gate of the third switching device prior to turning on the third switching device.
    Type: Grant
    Filed: September 19, 2017
    Date of Patent: January 28, 2020
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Youn Joong Lee, Koon Shik Cho, Ho Kwon Yoon
  • Patent number: 10536091
    Abstract: An energy harvesting device includes: a rectifier circuit rectifying an AC supply voltage received between first and second input terminals thereof to generate a DC rectified voltage between first and second output terminals thereof; a converter circuit performing DC-to-DC conversion upon the DC rectified voltage based on a control signal to generate a DC output voltage; and a control circuit comparing a first to-be-compared voltage (correlated to the DC rectified voltage) and a second to-be-compared voltage (correlated to a difference voltage between one of the first and second input terminals of the rectifier circuit and one of the first and second output terminals of the rectifier circuit) to generate the control signal.
    Type: Grant
    Filed: November 15, 2018
    Date of Patent: January 14, 2020
    Assignee: NATIONAL TSING HUA UNIVERSITY
    Inventors: Ping-Hsuan Hsieh, Shih-Wei Wang, Yi-Wen Ke
  • Patent number: 10536089
    Abstract: A switching power source apparatus includes: a synchronous rectifier switching element for synchronous rectification constituted of an insulated-gate field-effect transistor; and a secondary-side control circuit including a detector circuit and a timer circuit. The secondary-side control circuit performs ON/OFF control of the synchronous rectifier switching element. The detector circuit monitors a voltage of a drain terminal of the synchronous rectifier switching element, and detects an abnormal state in which the voltage of the drain terminal is undetectable. The timer circuit starts up and measures a predetermined time in response to the detector circuit detecting the abnormal state. When the detector circuit detects the abnormal state, and the predetermined time elapses according to the timer circuit, the secondary-side control circuit outputs a detection signal indicating an abnormality to outside.
    Type: Grant
    Filed: January 16, 2019
    Date of Patent: January 14, 2020
    Assignee: MITSUMI ELECTRIC CO., LTD.
    Inventors: Takumi Hyugaji, Minoru Kado
  • Patent number: 10511232
    Abstract: The present invention relates to a current loop powered DC-DC switch mode converter for use as a local isolated low power supply for electronic circuits such as current loop transmitters where the requirements for supply efficiency and cost of the implementation is critical. It is the object of the invention to provide a simple and low cost solution for driving a synchronous rectifier thereby improving the supply efficiency, especially at low output voltages.
    Type: Grant
    Filed: October 5, 2018
    Date of Patent: December 17, 2019
    Assignee: PR ELECTRONICS A/S
    Inventors: Stig Lindemann, Janus Honoré
  • Patent number: 10491137
    Abstract: According to one aspect, embodiments of the invention provide a power supply system comprising a power factor correction circuit coupled to an input and configured to draw input current from the input, an inverter coupled to an output and configured to provide output current to the output, a bus coupled to the power factor correction circuit and the inverter, and a switching circuit, the switching circuit configured to direct power from the power factor correction circuit to the inverter in a first mode of operation and from the bus to the inverter in a second mode of operation, wherein the switching circuit includes a neutral clamp circuit coupled to the power factor correction circuit and the inverter, the neutral clamp circuit configured to control a level of the input current drawn by the power factor correction circuit and a level of the output current provided by the inverter.
    Type: Grant
    Filed: May 1, 2014
    Date of Patent: November 26, 2019
    Assignee: SCHNEIDER ELECTRIC IT CORPORATION
    Inventor: Jonas Sonsby Mouridsen
  • Patent number: 10461660
    Abstract: A control device of a power converter includes first and second switching circuits. The device converts AC power supplied from an AC power supply into DC power, and supplies the DC power to the DC circuit. First converter arms are connected in series in the first switching circuit. Second converter arms are connected in series in the second switching circuit. The device further includes first and second control circuits connected to the first and the second switching circuits and control gate pulses of each of the first and the second arms respectively. A first and a second power interruption compensation circuits supply power to the first and the second control circuits for prescribed durations in power interruptions of the first and the second control circuits respectively.
    Type: Grant
    Filed: April 12, 2016
    Date of Patent: October 29, 2019
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Kazuhiro Usuki, Tomohisa Ohkami
  • Patent number: 10461644
    Abstract: Techniques are provided for controlling a synchronous rectification (SR) switch within a switched-mode power converter. The SR switch rectifies an output voltage of the power converter, and incurs little power loss in doing so. An SR controller generates control signals, including a turn-off trigger, that control conductivity of the SR switch. Voltages provided to the SR controller are divided down, so that the SR controller inputs do not need to support excessively high voltage levels as may be present in the power converter. The divided voltages are integrated to create a volt-second metric that closely tracks current through a winding of the power converter and the SR switch. The volt-second metric is compared against a threshold to determine when to issue an SR switch turn-off trigger.
    Type: Grant
    Filed: December 21, 2018
    Date of Patent: October 29, 2019
    Assignee: Infineon Technologies Austria AG
    Inventors: Xiaowu Gong, Andrey Malinin
  • Patent number: 10454383
    Abstract: A bidirectional resonant current-direct current conversion circuit and an uninterruptible power supply are provided. The bidirectional resonant current-direct current conversion circuit includes a full-bridge conversion module, a transformer, and a half-bridge conversion module. The full-bridge conversion module is coupled to the half-bridge conversion module via the transformer. The full-bridge conversion module is configured to convert two-level direct current power into alternating current power, and the half-bridge conversion module is configured to convert the alternating current power outputted by the full-bridge conversion module into three-level direct current power. The half-bridge conversion module is further configured to convert three-level direct current power into alternating current power, and the full-bridge conversion module is further configured to convert the alternating current power outputted by the half-bridge conversion module into two-level direct current power.
    Type: Grant
    Filed: January 15, 2019
    Date of Patent: October 22, 2019
    Assignee: Vertiv Corporation
    Inventors: Shanwei Wang, Baoshan Shen, Zhihong Yao
  • Patent number: 10454367
    Abstract: Two versions of an isolated single stage converter AC/DC Power Factor Corrected (PFC) converter topology have been invented. One is with a full bridge rectifier at its input and the other is a True Bridgeless version. The two versions of the topology feature new configurations and circuitry including a simplified damper circuit and a clamp capacitor flipping circuit and control methods that allow them to realize improved single stage isolated power factor converters which are suitable for high power operation, features Zero Voltage Switching to maximize conversion efficiency and to minimize Electro-Magnetic Interference generation, does not need an additional circuit to limit the inrush current, achieves reasonably low input current Total Harmonic Distortion (THD), and is easy to control. The second version provides a true bridgeless single stage isolated power factor converter with even higher efficiency and lower input current THD.
    Type: Grant
    Filed: February 28, 2019
    Date of Patent: October 22, 2019
    Inventor: Christopher Donovan Davidson
  • Patent number: 10433379
    Abstract: Several aspects of power distribution systems are described. One aspect relates to apparatus for providing a direct current to a load comprising one or more light emitting diodes. The apparatus comprises: a rectifier operatively connectable to a secondary winding of a transformer whose primary winding is for carrying a high-frequency alternating current; a first capacitor operatively connectable to the secondary winding; and a second capacitor operatively connectable, at least partly via the rectifier, to the secondary winding. The first and second capacitors together provide a reactance referred to the primary winding which substantially compensates for the reactance of the primary winding.
    Type: Grant
    Filed: May 12, 2018
    Date of Patent: October 1, 2019
    Assignee: Greengage Lighting Limited
    Inventor: Philip John Rimmer
  • Patent number: 10404104
    Abstract: In a wireless power supply apparatus, a first unit electrically connected to a power supply and a second unit electrically connected to an electric load. Power transmission is performed wirelessly between the first and second units using a magnetic resonance phenomenon. Each of the units has a resonant amplifier circuit provided with switching means driven by a drive signal, a resonant coil to which a high-frequency signal generated by the resonant amplifier circuit is supplied such that the resonant coil functions as a resonant inductor on the resonant amplifier circuit, and electric storage means electrically connected to the resonant amplifier circuit so as to be capable of charging and discharging power. The second unit includes current detecting means for detecting a current flowing through the storage means, and phase control means for controlling a phase of the drive signal for the switching means based on the detected current.
    Type: Grant
    Filed: March 27, 2015
    Date of Patent: September 3, 2019
    Assignees: DENSO WAVE INCORPORATED, DENSO CORPORATION
    Inventors: Shigeru Takeda, Masayoshi Sugino, Hiroshi Kondo
  • Patent number: 10389231
    Abstract: An apparatus and a method for preventing a reverse current in a DC-DC converter of a vehicle including a measurement portion configured to measure an output voltage of the DC-DC converter of the vehicle; a verification portion configured to verify a difference between the output voltage and a preset reference output voltage at every preset period; and a controller configured to control a switch of a synchronous rectification circuit, which is implemented at a secondary side of a main transformer of the DC-DC converter, to be in an ON or OFF state according to the difference between the output voltage and the preset reference output voltage.
    Type: Grant
    Filed: November 15, 2016
    Date of Patent: August 20, 2019
    Assignee: Hyundai Mobis Co., Ltd.
    Inventor: Hyo Jin Bang
  • Patent number: 10389130
    Abstract: An electrical assembly includes a power converter having first and second DC terminals which are connectable to a DC electrical network. The power converter also includes converter limbs connected between the first and second DC terminals. Each converter limb includes an AC terminal that is connectable to a respective AC phase of a multi-phase AC electrical network. Each converter limb also includes limb portions, each connected between a corresponding AC terminal and a respective one of the first and second DC terminals. Each limb portion includes switching element(s). The electrical assembly includes a single grounding circuit having a reactor configured to provide a current path for alternating current with a high impedance to ground and a current path for direct current with a low impedance to ground. The grounding circuit is arranged so that only one of the AC phases is connected to ground via the grounding circuit.
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: August 20, 2019
    Assignee: General Electric Technology GmbH
    Inventors: Robin Gupta, Robert Whitehouse
  • Patent number: 10386214
    Abstract: An interface circuit to an electromagnetic flow sensor is described. In an example, it can provide a DC coupled signal path from the electromagnetic flow sensor to an analog-to-digital converter (ADC) circuit. Examples with differential and pseudo-differential signal paths are described. Examples providing DC offset or low frequency noise compensation or cancellation are described. High input impedance examples are described. Coil excitation circuits are described, such as can provide on-chip inductive isolation between signal inputs and signal outputs. A switched mode power supply can be used to actively manage a bias voltage of an H-Bridge, such as to boost the current provided by the H-Bridge to the sensor coil during select time periods, such as during phase shift time periods of the coil, which can help reduce or minimize transient noise during such time periods.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: August 20, 2019
    Assignee: Analog Devices Global
    Inventor: Ke Li
  • Patent number: 10389282
    Abstract: A DC power supply unit is provided that allows for improving efficiency and reducing harmonic currents. A DC power supply unit includes: a bridge rectification circuit having diodes and MOSFETs; a reactor that is arranged between the AC power supply and the bridge rectifier circuit; a smoothing capacitor that is connected to an output side of the bridge rectifier circuit and smoothes a voltage; and a converter control unit that executes, based on predetermined threshold values, a diode rectification control that uses diodes and parasitic diodes of the MOSFETs, a synchronous rectification control that switches the MOSFETs in synchronization with a polarity of the voltage of the AC power supply, a partial switching control that repeats partially short-circuiting the reactor multiple times in a half cycle of the AC power supply, or a fast switching control that short-circuits the reactor at a predetermined frequency over a full AC cycle.
    Type: Grant
    Filed: February 25, 2016
    Date of Patent: August 20, 2019
    Assignee: Hitachi-Johnson Controls Air Conditioning, Inc.
    Inventors: Koji Tsukii, Atsushi Okuyama, Tsutomu Kurokawa, Masahiro Tamura, Kenji Tamura
  • Patent number: 10381941
    Abstract: A switching power supply device includes a transformer including a primary winding and a secondary winding, a first transistor coupled to the primary winding, a first control circuit that outputs a first control voltage, a delay circuit that delays the first control voltage and supplies the delayed first control voltage to the first transistor, a second transistor that has a first terminal coupled to the secondary winding, a diode coupled to the secondary winding, a second control circuit that outputs a third control voltage used for controlling a switching operation of the second transistor, a control voltage generation circuit that generates the second control voltage, and a delay time control circuit that determines an ON period in which the diode is switched on and controls a delay time so that the delay time by which the delay circuit delays the first control voltage is shorter for a longer ON period.
    Type: Grant
    Filed: October 18, 2018
    Date of Patent: August 13, 2019
    Assignee: FUJITSU LIMITED
    Inventor: Tatsuya Hirose
  • Patent number: 10381919
    Abstract: A rectifier is described herein. According to one example, the rectifier includes a semiconductor substrate and further includes an anode terminal and a cathode terminal connected by a load current path of a first MOS transistor and a diode that is connected parallel to a load current path. An alternating input voltage is operably applied between the anode terminal and the cathode terminal. Further, the rectifier includes a control circuit that is configured to switch the first MOS transistor on for an on-time period, during which the diode is forward biased. The first MOS transistor, the diode, and the control circuit are integrated in the semiconductor substrate.
    Type: Grant
    Filed: December 14, 2016
    Date of Patent: August 13, 2019
    Assignee: Infineon Technologies AG
    Inventors: Albino Pidutti, Damiano Gadler, Herbert Gietler, Michael Lenz, Yavuz Kilic, Ioannis Pachnis
  • Patent number: 10352742
    Abstract: An interface circuit to an electromagnetic flow sensor is described. In an example, it can provide a DC coupled signal path from the electromagnetic flow sensor to an analog-to-digital converter (ADC) circuit. Examples with differential and pseudo-differential signal paths are described. Examples providing DC offset or low frequency noise compensation or cancellation are described. High input impedance examples are described. Coil excitation circuits are described, such as can provide on-chip inductive isolation between signal inputs and signal outputs. A switched mode power supply can be used to actively manage a bias voltage of an H-Bridge, such as to boost the current provided by the H-Bridge to the sensor coil during select time periods, such as during phase shift time periods of the coil, which can help reduce or minimize transient noise during such time periods.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: July 16, 2019
    Assignee: Analog Devices Global
    Inventor: Ke Li
  • Patent number: 10355612
    Abstract: A flyback power converter circuit converting an input voltage to an output voltage includes a transformer, a power switch, a synchronous rectifier (SR) switch, and a secondary side control circuit. The secondary side control circuit controls the SR switch to be ON when the power switch is OFF. The secondary side control circuit includes a driving switch for controlling the SR switch, a synchronous control circuit powered by a voltage related to the output voltage, which controls the driving switch to operate the SR switch, and a clamping circuit including a clamping switch and a clamping switch control circuit. The clamping switch control circuit controls the clamping switch according to a current inflow terminal voltage of the clamping switch and/or the voltage related to the output voltage, such that, during a secondary side power-on period, an equivalent impedance of the current inflow terminal of the clamping switch is smaller than a predetermined clamping impedance.
    Type: Grant
    Filed: January 8, 2018
    Date of Patent: July 16, 2019
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Chien-Fu Tang, Su-Yuan Lin, Yi-Wei Lee, Isaac Y. Chen
  • Patent number: 10340786
    Abstract: A rectifier circuit can include a plurality of FETs arranged as a rectifier; and a start-up circuit applied to each of the plurality of FETs that turn each of the FETs off during a circuit startup period, wherein the start-up circuit provides a large impedance for low power dissipation during normal operation of the rectifier.
    Type: Grant
    Filed: February 15, 2018
    Date of Patent: July 2, 2019
    Assignee: Integrated Device Technology, Inc.
    Inventors: Lijie Zhao, Yue Wang, Stephen Ulbrich
  • Patent number: 10325548
    Abstract: A power converter may include the following elements: an input terminal for receiving an input voltage; an output terminal for providing an output voltage; a reference member for receiving a reference voltage; a first transistor electrically connected between the reference member and the input terminal; a second transistor electrically connected between the input terminal and the output terminal; a diode electrically connected in parallel with the second transistor; and a controller for selecting a first mode if the input voltage is greater than a first reference voltage level and for selecting a second mode if the input voltage has been less than a second reference voltage level for a reference time period. The first transistor and the diode may generate the output voltage in the first mode. The first transistor and the second transistor may generate the output voltage in the second mode.
    Type: Grant
    Filed: February 8, 2017
    Date of Patent: June 18, 2019
    Assignee: Samsung Display Co., Ltd.
    Inventors: Soon-Gi Kwon, Sung-Chun Park
  • Patent number: 10320281
    Abstract: A converter apparatus includes: a converter for converting an AC voltage into a DC voltage; a DC link capacitor connected to the converter; a voltage detector for DC link voltage; a charging circuit for the DC link capacitor; a charging circuit controller for a switch connected with a charging resistor; a current detector for detecting a current of the converter; a turn-on controller for controlling the turning-on of power devices; a switch for connecting or disconnecting a power supply; a power supply monitor for monitoring a connection state of the power supply; a threshold value setter for setting a first or second threshold value; and a failure detector for determining the presence or absence of the failure of the power devices by a comparison between a current flowing upon turning on the power device, immediately after disconnection of the power supply, and the first or second threshold value.
    Type: Grant
    Filed: April 2, 2018
    Date of Patent: June 11, 2019
    Assignee: FANUC CORPORATION
    Inventor: Tomokazu Yoshida
  • 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: 10291171
    Abstract: An upper switching device and a lower switching device in an electric-power conversion unit are separately driven to close by an upper closing command signal and a lower closing command signal, respectively, generated by a calculation control unit; in response to occurrence of an excessive current abnormality or an excessive voltage abnormality, upper and lower selection circuits and a penetration prevention circuit provided in a signal path select an upper three-phase short-circuiting command signal or a lower three-phase short-circuiting command signal, or an upper-and-lower six-phase cutoff command signal, and a penetration prevention time prohibits upper and lower switching devices from being concurrently closed; when an excessive voltage abnormality occurs, the three-phase short-circuiting command signal is immediately generated, without an advanced cutoff operation being performed. As a result, excessive-voltage breakage of the circuit components is prevented.
    Type: Grant
    Filed: January 12, 2018
    Date of Patent: May 14, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Naoki Moritake, Tomohiro Kimura, Kazunari Masudome
  • Patent number: 10291137
    Abstract: A flyback power converter includes a transformer having an auxiliary winding for generating an auxiliary voltage and providing a supply voltage on a supply node; a primary side controller circuit which is powered by the supply voltage from the supply node; and a high voltage (HV) start-up circuit. The HV start-up circuit is coupled to an high voltage signal through a HV input terminal and generates the supply voltage through a supply output terminal, wherein when the supply voltage does not exceed a start-up voltage threshold, a HV start-up switch conducts the HV input terminal and the supply output terminal to provide the supply voltage, and when the supply voltage exceeds a start-up voltage threshold, the HV start-up switch is OFF. The HV start-up circuit and the primary side controller circuit are packaged in two separate integrated circuit packages respectively.
    Type: Grant
    Filed: July 19, 2018
    Date of Patent: May 14, 2019
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Chien-Fu Tang, Isaac Y. Chen, Tzu-Chen Lin, Kun-Yu Lin, Li-Yang Hsiao, Yung-Chih Lai
  • Patent number: 10277224
    Abstract: A bootstrap diode emulator circuit having a cathode and an anode includes a transistor device and a diodic device. The transistor device is arranged at the cathode of the bootstrap diode emulator circuit. The diodic device has a cathode connected to the transistor device and an anode that is the anode of the bootstrap diode emulator circuit.
    Type: Grant
    Filed: December 13, 2017
    Date of Patent: April 30, 2019
    Assignee: Mosway Technologies Limited
    Inventor: On Bon Peter Chan
  • Patent number: 10277107
    Abstract: Various embodiments provide a resonant converter that includes a synchronous rectifier driver. The synchronous rectifier driver reduces voltage spikes on drains of transistors within the resonant converter by placing an active clamp between the drains of the transistors and an output terminal of the resonant converter. The active clamp reduces the voltage spikes by sinking current at the drains of the transistors to an output capacitor. By sinking the current to the output terminal, power loss is minimized and efficiency of the resonant converter is improved.
    Type: Grant
    Filed: December 27, 2017
    Date of Patent: April 30, 2019
    Assignee: STMICROELECTRONICS S.R.L.
    Inventors: Alberto Iorio, Maurizio Foresta
  • Patent number: 10270361
    Abstract: A control circuit and method for a synchronous rectifier having a plurality of switches and receiving an AC input signal. The control method includes switching between controlling a first switch of the plurality of switches in response to a control signal for a second switch of the plurality of switches, controlling the first switch in response to a comparison between the AC input signal and a second signal.
    Type: Grant
    Filed: May 10, 2016
    Date of Patent: April 23, 2019
    Assignee: MediaTek Inc.
    Inventors: Yun-Yoa Hung, Ming Chiang Ting
  • Patent number: 10256742
    Abstract: Systems, methods, and devices that employ self-driven gate-drive circuitry to facilitate controlling power switches to emulate a diode bridge to synchronously rectify a power signal are presented. A single-phase or multi-phase synchronous rectifier can comprise at least a first pair of switches of a first conducting path and a second pair of switches of a second conducting path that can form or emulate a diode bridge. To facilitate emulating turn-on and turn-off conditions of a diode, a switch can be turned on when voltage across the switch is forward-biased and turned off when switch current is reversed; also, there can be at least one current-controlled switch in each conducting path. Self-driven gate-drive circuitry employs low power components that can facilitate controlling respective switching of the at least first pair and second pair of switches, wherein switching of the switches is also controlled at start-up to emulate a diode bridge.
    Type: Grant
    Filed: March 3, 2017
    Date of Patent: April 9, 2019
    Assignee: CITY UNIVERSITY OF HONG KONG
    Inventors: Shu Yuen Ron Hui, Wenxing Zhong, Ho Wing Choi
  • Patent number: 10250157
    Abstract: The present disclosure relates to a synchronous rectification circuit. Operation states of four transistor switches in the synchronous rectification circuit are adjusted in accordance with a detected input voltage signal of the synchronous rectification circuit to achieve synchronous rectification. Moreover, the transistor switches in a rectifier bridge and a switching control circuit are all integrated into a single chip to have an increased integration level, a reduced chip size, and high efficiency. The present disclosure also relates to a switching power supply comprising the above synchronous rectification circuit.
    Type: Grant
    Filed: July 3, 2017
    Date of Patent: April 2, 2019
    Assignee: SILERGY SEMICONDUCTOR TECHNOLOGY (HANGZHOU) LTD.
    Inventor: Lingdong Zhang
  • Patent number: 10230309
    Abstract: A synchronous bridge rectifier comprises a plurality of synchronously switched elements and a plurality of controller circuits, one for each of the synchronously switched elements. The synchronously switched elements may be field-effect transistors. Each controller circuit is configured to sense voltage across the corresponding synchronously switched element to control opening and closing of the synchronously switched element so as to rectify the alternating current input signal to form a direct current output signal.
    Type: Grant
    Filed: November 10, 2017
    Date of Patent: March 12, 2019
    Assignee: Champion Microelectronics Corporation
    Inventor: Jeffrey Hwang
  • Patent number: 10224824
    Abstract: A driver includes a high-side driver transistor coupled between supply voltage and the gate drive nodes and provides a first charge current to a high side gate node of the high-side driver transistor until the gate drive node reaches a first gate drive threshold. Then a second charge current is provided to the high side gate node that is less than the first charge current. The gate drive node is limited to a first clamped threshold for a delay time. A gate drive current rise signal sets the value of the second charge current that charges the high side gate node and after the delay time the gate drive voltage is limited to a second clamped threshold greater than the first clamped threshold but less than the supply voltage. A gate drive programmable control signal sets the value of the second clamped threshold.
    Type: Grant
    Filed: March 19, 2018
    Date of Patent: March 5, 2019
    Assignee: STMicroelectronics S.R.L.
    Inventors: Alberto Iorio, Maurizio Foresta
  • Patent number: 10218258
    Abstract: A method and apparatus for driving a power stage is presented. In particular, the power stage is a half-bridge. In the method, there is a first power switch coupled to a second power switch via a switching node. The method steps include sensing a first control-terminal voltage of one of the first power switch and the second power switch and turning on the first power switch based on the first control-terminal voltage and sensing a second control-terminal voltage of one of the first power switch and the second power switch and turning on the second power switch based on the second control-terminal voltage. Optionally, the first power switch is turned on when the first control-terminal voltage has reached a first threshold value, and the second power switch is turned on when the second control-terminal voltage has reached a second threshold value.
    Type: Grant
    Filed: January 9, 2018
    Date of Patent: February 26, 2019
    Assignee: Dialog Semiconductor (UK) Limited
    Inventors: Christoph N. Nagl, Horst Knoedgen, Nebojsa Jelaca
  • Patent number: 10211720
    Abstract: A wireless power transmitter comprises a bridge inverter including a first switch and a second switch coupled together with a first switching node therebetween, and a first capacitor coupled to the first switching node. The transmitter further includes control logic configured to control the first switch and the second switch according to an operating frequency to generate an AC power signal from a DC power signal, and a resonant tank operably coupled to the first switching node of the bridge inverter, the resonant tank configured to receive the AC power signal and generate an electromagnetic field responsive thereto. A method for operating the wireless power transmitter and a method for making the wireless power transmitter are also disclosed.
    Type: Grant
    Filed: November 8, 2013
    Date of Patent: February 19, 2019
    Assignee: Integrated Device Technology, Inc.
    Inventor: Mehmet K. Nalbant
  • Patent number: 10205397
    Abstract: A method is shown to create soft transition in selected topologies by controlling and designing a current pulse injection in front of the output choke to overwhelm the output current at a certain point in the switching cycle.
    Type: Grant
    Filed: July 10, 2015
    Date of Patent: February 12, 2019
    Assignee: ROMPOWER TECHNOLOGY HOLDINGS, LLC
    Inventor: Ionel Jitaru