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    COMMON-MODE VOLTAGE SUPPRESSION METHOD AND SYSTEM FOR QUASI-Z-SOURCE SIMPLIFIED THREE-LEVEL INVERTER
    1.
    发明公开
    COMMON-MODE VOLTAGE SUPPRESSION METHOD AND SYSTEM FOR QUASI-Z-SOURCE SIMPLIFIED THREE-LEVEL INVERTER 审中-公开

    公开(公告)号：US20240348152A1

    公开(公告)日：2024-10-17

    申请号：US18280336

    申请日：2022-12-28

    申请人： SHANDONG JIANZHU UNIVERSITY

    发明人： Changwei QIN ,  Xiaoyan LI ,  Zhiyuan CHU ,  Hongliang ZHANG ,  Yanfeng LI

    IPC分类号： H02M1/12 ,  H02M1/088 ,  H02M7/487 ,  H02M7/5395

    CPC分类号： H02M1/123 ,  H02M1/088 ,  H02M7/487 ,  H02M7/5395

    摘要： A common-mode voltage suppression method includes: selecting two large and two small vectors with low common-mode voltage magnitudes as basic voltage vectors; writing a volt-second balance equation according to a selected basic voltage vectors, and calculating, an introduced distribution factor of duty cycles of small vectors, initial values of distribution factors of a duty cycle of each basic voltage vector and of small vectors; designing a neutral-point voltage balance controller to obtain and utilize a corrected value of the distribution factor of the duty cycles of the small vectors and the initial values and combine with a set neutral-point voltage balance control threshold to update the duty cycle of each basic voltage vector; and inserting shoot-through states into the small vectors, designing a switching sequence, converting the sequence into a driving signal of a power switch, and controlling an operation of the quasi-Z-source simplified three-level inverter.

    Three-level power converter and method of controlling intermediate potential of direct current power supply unit
    4.
    发明授权
    Three-level power converter and method of controlling intermediate potential of direct current power supply unit 有权

    公开(公告)号：US12107513B2

    公开(公告)日：2024-10-01

    申请号：US17801599

    申请日：2020-03-27

    申请人： Mitsubishi Electric Corporation

    发明人： Takeo Yamamoto ,  Shinichiro Hayashi

    IPC分类号： H02M7/483 ,  H02M1/14 ,  H02M7/487 ,  H02M7/5387

    CPC分类号： H02M7/483 ,  H02M1/143 ,  H02M7/4833 ,  H02M7/487 ,  H02M7/53873

    摘要： A three-level power converter includes a direct current power supply unit including a filter capacitor connected between a high potential line and an intermediate potential line and a filter capacitor connected between the intermediate potential line and a low potential line, and a power conversion circuit that converts a three-level direct current voltage output from the high potential line, the intermediate potential line, and the low potential line into a three-phase alternating current voltage. A controller generates an imbalance signal representing an imbalance between a first capacitor voltage and a second capacitor voltage on the basis of values detected by voltage sensors, and generates a modulation signal for causing the power conversion circuit to perform a two-phase modulation operation on the basis of a superimposed signal obtained by superimposing the imbalance signal on a reference signal of the three-phase alternating current voltage.

    SPACE VECTOR PULSE WIDTH MODULATION CONTROL OF THREE-PHASE MULTI-LEVEL INVERTERS
    7.
    发明公开
    SPACE VECTOR PULSE WIDTH MODULATION CONTROL OF THREE-PHASE MULTI-LEVEL INVERTERS 审中-公开

    公开(公告)号：US20240204690A1

    公开(公告)日：2024-06-20

    申请号：US18171929

    申请日：2023-02-21

    申请人： Hamilton Sundstrand Corporation

    发明人： Palash Mairal ,  Rajkumar Sengodan

    IPC分类号： H02M7/5387 ,  H02M7/487 ,  H02P21/22 ,  H02P27/08

    CPC分类号： H02M7/53871 ,  H02M7/487 ,  H02P21/22 ,  H02P27/08

    摘要： An inverter system includes an inverter having a plurality of switching elements arranged with at least three levels, where the inverter is configured to receive a direct current input and output an alternating current to three phases. The inverter system also includes a controller configured to determine a reference voltage angle based on a first voltage and a second voltage that are orthogonal components of a reference voltage and determine a sector of a space vector map of the reference voltage based on the reference voltage angle. The controller is also configured to determine an active time pair of vector states associated with on-off states of the switching elements to modulate between based on the sector and the reference voltage angle and output a carrier waveform for each of the three phases to control modulation of the switching elements to achieve the reference voltage for the three phases.

    Inverter capable of operating in multiple states
    8.
    发明授权
    Inverter capable of operating in multiple states 有权

    公开(公告)号：US11984818B2

    公开(公告)日：2024-05-14

    申请号：US17681922

    申请日：2022-02-28

    申请人： DENSO CORPORATION

    发明人： Ken Toshiyuki

    IPC分类号： H02M7/487 ,  H02M1/32 ,  H02M7/537

    CPC分类号： H02M7/487 ,  H02M1/325 ,  H02M7/537

    摘要： In an inverter, three switching circuits each include first to fourth switching elements, first and second diodes, and a control circuit controlling potentials of gates. The control circuit causes potentials of U-, V-, and W-phase output wirings to change among high, neutral point, and low potentials. The control circuit performs an emergency operation when any of the second and third switching elements and the first and second diodes has caused a short fault. In the emergency operation, a potential of a limit output wiring is caused to change between two potentials that are not inhibiting potentials, and potentials of normal output wirings are caused to change among three potentials. When the short-fault element is the second switching element or the second diode, an inhibiting potential is the low potential. When the short-fault element is the third switching element or the first diode, the inhibiting potential is the high potential.

    Power Conversion Device and Apparatus
    9.
    发明公开
    Power Conversion Device and Apparatus 审中-公开

    公开(公告)号：US20240146171A1

    公开(公告)日：2024-05-02

    申请号：US18490892

    申请日：2023-10-20

    申请人： Solaredge Technologies Ltd.

    发明人： Ilan Yoscovich ,  Tzachi Glovinsky ,  Daniel Zmood ,  David Avraham

    IPC分类号： H02M1/00 ,  H02M7/487

    CPC分类号： H02M1/0003 ,  H02M7/487

    摘要： A power converter employing a plurality of parallel high-frequency switching legs, and a low-frequency switching leg, is disclosed. A load may be coupled between the high-frequency switching legs and the low-frequency switching leg. A number of levels of a power waveform produced by the power converter may be higher than the number of levels of the high-frequency switching legs. The low-frequency switching leg may employ switches which may have low switching frequency characteristics, low conduction losses, and may be less expensive.

    Modulation Methods and Controllers for Neutral Point Clamped Converter
    10.
    发明公开
    Modulation Methods and Controllers for Neutral Point Clamped Converter 审中-公开

    公开(公告)号：US20240079968A1

    公开(公告)日：2024-03-07

    申请号：US18220476

    申请日：2023-07-11

    申请人： Queen's University at Kingston

    发明人： Javad Ebrahimi Jouzdani ,  Alireza Bakhshai ,  Hamidreza Karshenas

    IPC分类号： H02M7/487

    CPC分类号： H02M7/487

    摘要： A method for controlling a three phase neutral point clamped (NPC) converter independently controls switching devices of each phase to produce a reconstructed output voltage level of each phase based on a linear combination of three voltage levels of that phase. The method includes setting duty ratios of the switching devices of each phase to provide the reconstructed voltage level of each phase during a switching cycle, wherein the three voltage levels of each phase are 0,





    Vdc
    2

    ,




    and Vdc, where Vdc is the NPC converter input voltage. Controllers for three phase NPC converters produce drive signals for the switching devices according to the methods.