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    AUXILIARY PRE-CHARGING DEVICE OF POWER CONVERTER, PRE-CHARGING METHOD AND POWER CONVERTER
    2.
    发明申请
    AUXILIARY PRE-CHARGING DEVICE OF POWER CONVERTER, PRE-CHARGING METHOD AND POWER CONVERTER 有权

    公开(公告)号：US20220302848A1

    公开(公告)日：2022-09-22

    申请号：US17534176

    申请日：2021-11-23

    Applicant: Eaton Intelligent Power Limited

    Inventor： Jianxiong Yu ,  Jiajie Duan ,  Han Li ,  Cheng Luo ,  Qiang Chen

    IPC: H02M3/335 ,  H02M1/36 ,  H02M5/458

    Abstract: The present invention provides an auxiliary pre-charging device for a power converter. The power converter includes at least one power unit with an input end being connected to a medium and high voltage AC power source, and an output end being connected to a low voltage DC bus, wherein the auxiliary pre-charging device includes a switch, a transformer, a pre-charging resistor, and a rectifier sequentially connected in series, one end of the switch is connected to the medium and high voltage AC power source, and an output end of the rectifier is connected to the low voltage DC bus. The present invention also provides a pre-charging method for a power converter, which uses the aforementioned auxiliary pre-charging device to start pre-charging at the low-voltage output end of the power converter.

    HARMONIC SUPPRESSION METHOD AND APPARATUS FOR THREE-PHASE THREE-WIRE CASCADED POWER CONVERSION APPARATUS
    3.
    发明申请
    HARMONIC SUPPRESSION METHOD AND APPARATUS FOR THREE-PHASE THREE-WIRE CASCADED POWER CONVERSION APPARATUS 有权

    公开(公告)号：US20250070647A1

    公开(公告)日：2025-02-27

    申请号：US18795941

    申请日：2024-08-06

    Applicant: EATON INTELLIGENT POWER LIMITED

    Inventor： Jianxiong Yu ,  Jiajie Duan ,  Cheng Luo ,  Cheng Wang

    IPC: H02M1/12 ,  H02M1/00 ,  H02M1/14 ,  H02M7/219

    Abstract: A harmonic suppression method and apparatus for a three-phase three-wire cascaded power conversion apparatus is disclosed. The method can include: calculating a first current output from a full-bridge rectifier module to a floating direct current side, the first current being composed of a first current direct current component and a first current double frequency component; and generating a first injection voltage with a triple frequency, so as to inject the first injection voltage into the floating direct current side and transfer at least a portion of the first current double frequency component to a low-voltage direct current side, where total current on the floating direct current side is composed of the first current and a second current after the first injection voltage is injected, the second current is composed of a second current double frequency component and a second current quadruple frequency component, and the amplitude and the phase angle of the first injection voltage are configured so that the first and second current double frequency components are at least partially canceled. The method reduces the demand for capacitance on the floating direct current side of the power conversion apparatus, resulting in a significant increase in power density and high power conversion efficiency.

    Multi-active bridge (MAB) converter and control method thereof and power conversion device
    4.
    发明授权
    Multi-active bridge (MAB) converter and control method thereof and power conversion device 有权

    公开(公告)号：US12136887B2

    公开(公告)日：2024-11-05

    申请号：US17930949

    申请日：2022-09-09

    Applicant: Eaton Intelligent Power Limited

    Inventor： Jiajie Duan ,  Jianxiong Yu ,  Qiang Chen ,  Han Li ,  Cheng Luo ,  Dongsheng Li

    IPC: H02M3/335 ,  H02M1/12

    Abstract: The present invention provides a multi-active bridge converter. The converter comprises n multi-active bridges, wherein each of the n multi-active bridges comprises a DC/AC bridge, a single-phase transformer and m AC/DC bridges, where n is greater than or equal to 3, and m is greater than or equal to 1; the single-phase transformer is provided with one primary winding and m secondary windings; the DC/AC bridge is configured to receive a DC input signal, and AC output terminals of the DC/AC bridge are connected to the primary winding of the single-phase transformer; one terminal of the ith secondary winding among the m secondary windings of the single-phase transformer is connected to an AC input terminal of the ith AC/DC bridge among the m AC/DC bridges, the other terminal of the ith secondary winding is connected to the other terminals of the ith secondary windings among m secondary windings of single-phase transformers in the remaining (n−1) multi-active bridges, where i is greater than or equal to 1 and less than or equal to m; and positive busbars DC+ and negative busbars DC− of the DC output terminals of all the AC/DC bridges among the n multi-active bridges are respectively connected with each other to serve as DC output terminals of the multi-active bridge converter.

    POWER FACTOR CORRECTION CIRCUIT, POWER FACTOR CORRECTION ASSEMBLY AND ON-LINE UNINTERRUPTIBLE POWER SUPPLY COMPRISING SAME
    5.
    发明申请
    POWER FACTOR CORRECTION CIRCUIT, POWER FACTOR CORRECTION ASSEMBLY AND ON-LINE UNINTERRUPTIBLE POWER SUPPLY COMPRISING SAME 有权

    公开(公告)号：US20220021298A1

    公开(公告)日：2022-01-20

    申请号：US17299730

    申请日：2019-12-03

    Applicant: Eaton Intelligent Power Limited

    Inventor： Cheng Luo ,  Huiting Xin ,  Han Li ,  Dawei Zheng ,  Hualiang Li

    IPC: H02M1/42 ,  H02J9/06 ,  H02M1/00 ,  H02M3/335 ,  H02M7/493

    Abstract: The present invention provides a power factor correction circuit (21, 22), a power factor correction assembly (2) and an on-line uninterruptible power supply including the same. The power factor correction circuit (21) comprises a pulse width modulated rectifier (211, 221) and an isolated DC-DC converter (212, 222), wherein an output of the pulse width modulated rectifier (211, 221) is connected to an input of the isolated DC-DC converter (212, 222). The power factor correction assembly (2) comprises a plurality of power factor correction circuits (21, 22) described above, wherein inputs of pulse width modulated rectifiers (211, 221) in the plurality of power factor correction circuits (21, 22) are connected in series, and outputs of isolated DC-DC converters (212, 222) in the plurality of power factor correction circuits (21, 22) are connected in parallel. The power factor correction assembly (2) of the present invention needs no line-frequency transformer and has the advantages of small size, low cost and improved operation reliability.

    TRANSFORMER WINDING AND METHOD FOR CONSTRUCTING TRANSFORMER WINDING
    7.
    发明申请
    TRANSFORMER WINDING AND METHOD FOR CONSTRUCTING TRANSFORMER WINDING 有权

    公开(公告)号：US20250087412A1

    公开(公告)日：2025-03-13

    申请号：US18813920

    申请日：2024-08-23

    Applicant: EATON INTELLIGENT POWER LIMITED

    Inventor： Jianxiong Yu ,  Cheng Luo ,  Jiajie Duan ,  Cheng Wang

    IPC: H01F27/32 ,  H01F27/28 ,  H01F41/12

    Abstract: Provided are a transformer winding and a method for constructing a transformer winding. The transformer winding includes: a lead wire of a winding conductor of the transformer winding; an insulating layer wrapping the lead wire; a ground shielding layer covering a side, close to the winding conductor, of the insulating layer; and a stress grading material layer, which is made of a semi-conductive material, covers a side, away from the winding conductor, of the insulating layer, and is electrically connected to the ground shielding layer, where the stress grading material layer is impedance-matched with the insulating layer.

    DIRECT CURRENT VOLTAGE SAMPLING CIRCUIT USED FOR MEDIUM-VOLTAGE POWER MODULE
    8.
    发明申请
    DIRECT CURRENT VOLTAGE SAMPLING CIRCUIT USED FOR MEDIUM-VOLTAGE POWER MODULE 有权

    公开(公告)号：US20250070680A1

    公开(公告)日：2025-02-27

    申请号：US18809718

    申请日：2024-08-20

    Applicant: Eaton Intelligent Power Limited

    Inventor： Jianxiong Yu ,  Jiajie Duan ,  Cheng Luo ,  Cheng Wang

    IPC: H02M3/335 ,  H02M1/00

    Abstract: Provided is a direct current voltage sampling circuit used for a medium-voltage power module. The medium-voltage power module includes two cascaded H-bridge circuits. The sampling circuit includes two sampling sub-circuits, with each connected to one H-bridge circuit. The sampling sub-circuit includes: a voltage dividing circuit connected in parallel to an output end of the H-bridge circuit, an isolation module connected to the voltage dividing circuit, a direct current isolated power supply which supplies power to the isolation module independently of the H-bridge circuit, and an amplifier conditioning module which converts an isolated voltage signal into a sampled voltage output. Parasitic capacitances of the isolation module and the direct current isolated power supply are both less than 2 pF, and the sampled voltage outputs of the two sampling sub-circuits are provided to a same local controller. The sampling circuit can suppress the impact of circulation components between two direct current buses in double cascaded bridges, making sampling results more accurate.

    Multi-Active Bridge (MAB) Converter and Control Method Thereof and Power Conversion Device
    10.
    发明申请
    Multi-Active Bridge (MAB) Converter and Control Method Thereof and Power Conversion Device 有权

    公开(公告)号：US20230081157A1

    公开(公告)日：2023-03-16

    申请号：US17930949

    申请日：2022-09-09

    Applicant: Eaton Intelligent Power Limited

    Inventor： Jiajie Duan ,  Jianxiong Yu ,  Qiang Chen ,  Han Li ,  Cheng Luo ,  Dongsheng Li

    IPC: H02M3/335 ,  H02M1/12

    Abstract: The present invention provides a multi-active bridge converter. The converter comprises n multi-active bridges, wherein each of the n multi-active bridges comprises a DC/AC bridge, a single-phase transformer and m AC/DC bridges, where n is greater than or equal to 3, and m is greater than or equal to 1; the single-phase transformer is provided with one primary winding and m secondary windings; the DC/AC bridge is configured to receive a DC input signal, and AC output terminals of the DC/AC bridge are connected to the primary winding of the single-phase transformer; one terminal of the ith secondary winding among the m secondary windings of the single-phase transformer is connected to an AC input terminal of the ith AC/DC bridge among the m AC/DC bridges, the other terminal of the ith secondary winding is connected to the other terminals of the ith secondary windings among m secondary windings of single-phase transformers in the remaining (n−1) multi-active bridges, where i is greater than or equal to 1 and less than or equal to m; and positive busbars DC+ and negative busbars DC− of the DC output terminals of all the AC/DC bridges among the n multi-active bridges are respectively connected with each other to serve as DC output terminals of the multi-active bridge converter.

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