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    Variable inductor apparatuses systems and methods
    1.
    发明授权
    Variable inductor apparatuses systems and methods 有权

    公开(公告)号：US11183322B2

    公开(公告)日：2021-11-23

    申请号：US15958220

    申请日：2018-04-20

    Applicant: ABB Schweiz Ag

    Inventor： Harish Suryanarayana ,  Jiaqi Liang ,  Jukka Pekka Kittila ,  Wen Ouyang

    IPC: H01F3/14 ,  H01F27/28 ,  H01F29/14 ,  H01F27/24 ,  H01F21/08

    Abstract: Unique systems, methods, techniques and apparatuses for a ZVT ZCT resonant converter with a variable resonant tank are disclosed. One exemplary embodiment is a system comprising a bidirectional resonant converter comprising an input/output terminal, a switching device coupled with the input/output terminal, a resonant circuit coupled with the switching device and including a variable inductor, an output/input terminal coupled with the resonant circuit, and a DC biasing circuit operatively coupled with the variable inductor. The variable inductor comprises a toroidal core, a first winding wound around the toroidal core and coupled with the switching device and the output/input terminal, a second core structured to overlap a portion of the toroidal core, and a second winding wound around the second core and coupled with the DC biasing circuit. The DC biasing circuit is controllable to vary the inductance of the variable inductor by saturating a portion of the toroidal core.

    Resonant converters including flying capacitors
    2.
    发明授权
    Resonant converters including flying capacitors 有权

    公开(公告)号：US09871467B2

    公开(公告)日：2018-01-16

    申请号：US15159227

    申请日：2016-05-19

    Applicant: ABB Schweiz AG

    Inventor： Jiaqi Liang ,  Harish Suryanarayana ,  Jukka-Pekka Kittila

    IPC: H02M7/537 ,  H02M3/335

    CPC classification number: H02M7/537 ,  H02M3/33569 ,  H02M7/483 ,  H02M2001/0058 ,  H02M2007/4815 ,  Y02B70/1441 ,  Y02B70/1491

    Abstract: Unique systems, methods, techniques and apparatuses of zero-voltage transition pulse width modulation resonant converters are disclosed. One exemplary embodiment is a zero-voltage transition PWM resonant converter comprising a DC bus, a first switching device, a second switching device, a resonant tank circuit, an auxiliary circuit having a flying capacitor and a plurality of auxiliary switching devices, and a controller. The controller is structured to control the first switching device, the second switching device, and the plurality of auxiliary switching devices to provide resonant operation of the tank circuit effective to provide a substantially zero voltage condition across the first switching device when turning the first switching device on or off and to provide a substantially zero voltage condition across the second switching device when turning the second switching device on or off.

    Multilevel converter with reduced AC fault handling rating
    3.
    发明授权
    Multilevel converter with reduced AC fault handling rating 有权

    公开(公告)号：US10256745B2

    公开(公告)日：2019-04-09

    申请号：US15327755

    申请日：2014-11-25

    Applicant: ABB SCHWEIZ AG

    Inventor： Alireza Nami ,  Jiaqi Liang ,  Frans Dijkhuizen ,  Liwei Wang

    IPC: H02M1/32 ,  H02M7/483 ,  H02J3/18 ,  H02M1/12

    Abstract: A multilevel converter converting between AC and DC includes a phase leg having a first and a second phase arm, the first phase arm being connected between a first pole having a first potential and a first AC terminal and the second phase arm being connected between the first AC terminal and a second potential, where the phase arms include half-bridge and full-bridge cells, where each cell includes at least one energy storage element for providing the voltage contribution and cell switching units with cell switches and anti-parallel diodes for controlling the voltage contribution, where the full-bridge cells include a bypass switch controllable to bypass the corresponding energy storage element, and when a phase-to-ground fault occurs the cell switches are blocked and the bypass switches activated with a delay in relation to the blocking.

    Reducing peak fault output current in a DC power generation system
    5.
    发明授权
    Reducing peak fault output current in a DC power generation system 有权

    公开(公告)号：US09608551B2

    公开(公告)日：2017-03-28

    申请号：US14828079

    申请日：2015-08-17

    Applicant: ABB Schweiz AG

    Inventor： Wen Ouyang ,  Jiaqi Liang ,  Li Qi

    IPC: H02P9/10 ,  H02P9/14 ,  H02K3/16 ,  H02P9/00 ,  H02K11/04 ,  H02K1/10

    CPC classification number: H02P9/006 ,  H02K3/16 ,  H02K3/20 ,  H02K11/046 ,  H02K19/10 ,  H02M1/081 ,  H02M7/1557

    Abstract: Technologies for reducing peak fault output current in a DC power generation system include a generator having a reduced damper winding and a controller to control a rectifier array to generate a DC power output. In some embodiments, the generator may have no damper windings, may have damper windings including a reduced number of damper bars, and/or may have damper windings having separated end ring mounts for each damper bar. The controller is configured to control the rectifier array so as to reduce oscillations of the DC output that may be due to the reduced damper windings. To do so, the controller is configured to generate the control signal based on an oscillation component of the DC power output. For example, the controller may generate an oscillation correction signal based on the DC power output and adjust a firing angle set point of the rectifier array based on the oscillation correction signal.

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