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    EMI NOISE REDUCTION CIRCUIT FOR DC/DC CONVERTER
    1.
    发明申请
    EMI NOISE REDUCTION CIRCUIT FOR DC/DC CONVERTER 有权

    公开(公告)号：US20240372464A1

    公开(公告)日：2024-11-07

    申请号：US17474623

    申请日：2021-09-14

    Applicant: General Electric Company

    Inventor： Gang Yao ,  Ramanujam Ramabhadran ,  Cong Li

    IPC: H02M1/44 ,  H02J7/00

    Abstract: A power system is provided. The power system includes a multi-level DC/DC converter electrically coupled with a terminal of a voltage source, such as a battery. The power system includes an EMI filter network having EMI shunt filters electrically coupled between the terminals of the battery and a reference frame or grounding system. The EMI shunt filters each include at least one of a first order filter and a second order filter. The elements of these ordered filters can be used to shunt common mode electric current to less-resistive paths, limit voltage, and reduce common mode voltage noise to ultimately reduce the common mode effects in the power system.

    VOLTAGE BALANCE SYSTEMS AND METHODS FOR MULTILEVEL CONVERTERS
    2.
    发明申请
    VOLTAGE BALANCE SYSTEMS AND METHODS FOR MULTILEVEL CONVERTERS 有权

    公开(公告)号：US20220311337A1

    公开(公告)日：2022-09-29

    申请号：US17619397

    申请日：2019-06-17

    Applicant: General Electric Company

    Inventor： Zheyu Zhang ,  Tomas Sadilek ,  Ramanujam Ramabhadran ,  Hao Tu

    IPC: H02M3/158 ,  H02M1/00 ,  H02J7/00

    Abstract: A multilevel converter system is provided. The system includes a converter and a converter controller interfaced with the converter. The converter controller includes a voltage loop, a current loop, and a voltage compensation loop. The voltage loop is configured to receive first and second voltages from the first and second segments of the converter and a reference voltage. The current loop is configured to receive a current output of the converter, a reference current, and a balancing reference current. The voltage compensation loop is configured to receive the first and second voltages and a sign signal. The converter controller is configured to generate first and second pulse-width modulation (PWM) signals using output signals from the current loop and the output compensation signals from the voltage compensation loop. The PWM signals are configured to control the switches of the converter and to balance the first voltage with the second voltage.

    Electrical waveform for gas turbine igniter
    3.
    发明授权
    Electrical waveform for gas turbine igniter 有权

    公开(公告)号：US10995672B2

    公开(公告)日：2021-05-04

    申请号：US16033942

    申请日：2018-07-12

    Applicant: General Electric Company

    Inventor： Badri Narayan Ramamurthi ,  Karim Younsi ,  Andrey Meshkov ,  Jason Fredrick Trotter ,  Timothy John Sommerer ,  Ramanujam Ramabhadran ,  Alvaro Alexander Briceno ,  Charles Cook ,  Mark Wayne McWaters

    IPC: F02C7/266 ,  H01T15/00

    Abstract: The present disclosure relates to gas turbine engine operation in which an igniter assembly is provided with an electrical energy input (e.g., an electrical waveform) that is configured to increase a likelihood of igniting a fuel-air mixture surrounding the igniter assembly. In certain embodiments, the igniter assembly is supplied with an augmented electrical waveform that may reduce a quantity of sparks generated by the igniter assembly before successful light-off (e.g., ignition) of the fuel-air mixture is achieved (e.g., as compared to a quantity of sparks generated to achieve ignition by an igniter assembly that receives an electrical energy input in the form of a conventional electrical waveform). Accordingly, the augmented electrical waveform may reduce wear (e.g., via oxidation) on electrodes of the igniter assembly, such as a primary electrode (e.g., a center electrode) and a secondary electrode (e.g., an outer shell electrode) disposed about the primary electrode.

    CIRCUITS AND METHODS FOR SYNCHRONOUS RECTIFICATION IN RESONANT CONVERTERS
    6.
    发明申请
    CIRCUITS AND METHODS FOR SYNCHRONOUS RECTIFICATION IN RESONANT CONVERTERS 有权
    用于同步转换器同步整流的电路和方法

    公开(公告)号：US20170025965A1

    公开(公告)日：2017-01-26

    申请号：US14806793

    申请日：2015-07-23

    Applicant: General Electric Company

    Inventor： Ramanujam Ramabhadran ,  Yehuda Daniel Levy ,  Xu She

    IPC: H02M3/335

    CPC classification number: H02M3/33592 ,  H02M3/33546 ,  H02M2001/0058 ,  Y02B70/1433 ,  Y02B70/1475 ,  Y02B70/1491 ,  Y02P80/112

    Abstract: A resonant converter includes a primary stage having first and second switches coupled in series, a controller coupled to the first switch and the second switch to control operation thereof, a first transformer comprising a primary coil coupled to a node between the first and second switches, and a resonant inductor coupled to the primary coil of the first transformer. The resonant converter also includes a secondary stage having a second transformer formed of a primary coil coupled to the resonant inductor and a secondary coil comprising first and second coil sections, a third switch coupled to the first coil section of the secondary coil, and a fourth switch coupled to the second coil section of the secondary coil. A switch drive circuit is provided to drive the third and fourth switches for synchronous rectification, with the switch drive circuit comprising a secondary coil of the first transformer.

    Abstract translation: 谐振转换器包括具有串联耦合的第一和第二开关的初级级，连接到第一开关和第二开关以控制其操作的控制器;第一变压器，包括耦合到第一和第二开关之间的节点的初级线圈， 以及耦合到第一变压器的初级线圈的谐振电感器。 谐振转换器还包括具有由耦合到谐振电感器的初级线圈形成的第二变压器和包括第一和第二线圈段的次级线圈，耦合到次级线圈的第一线圈段的第三开关的第二级和第四级 开关耦合到次级线圈的第二线圈部分。 提供开关驱动电路以驱动用于同步整流的第三和第四开关，开关驱动电路包括第一变压器的次级线圈。

    SYSTEM FOR DRIVING A PIEZOELECTRIC LOAD AND METHOD OF MAKING SAME
    8.
    发明申请
    SYSTEM FOR DRIVING A PIEZOELECTRIC LOAD AND METHOD OF MAKING SAME 有权
    驱动压电负载的系统及其制造方法

    公开(公告)号：US20150022056A1

    公开(公告)日：2015-01-22

    申请号：US14506761

    申请日：2014-10-06

    Applicant: General Electric Company

    Inventor： John Stanley Glaser ,  Ramanujam Ramabhadran

    IPC: H02M3/335 ,  H01L41/107

    CPC classification number: H02M3/33584 ,  H01L41/042 ,  H01L41/107 ,  H02M2001/0077 ,  H02N2/0075 ,  Y10T29/42 ,  Y10T307/549

    Abstract: A driver system comprises a direct current (DC) voltage source and a first bi-directional DC-to-DC converter having a primary side coupled to the DC voltage source and a secondary side and configured to convert a first voltage on the primary side to a second voltage on the secondary. The driver system also comprises a second bi-directional DC-to-DC converter having a primary side coupled to the DC voltage source and a secondary side coupled to the secondary side of the first bi-directional DC-to-DC converter and configured to convert the first voltage on the primary side to a third voltage on the secondary. The first and second bi-directional DC-to-DC converters are capable of boosting the first voltage, and the second control signal is a complement of the first control signal. A voltage difference between the second and third voltages comprises an output voltage that comprises an amplification of the first control signal.

    Abstract translation: 驱动器系统包括直流（DC）电压源和第一双向DC-DC转换器，其具有耦合到DC电压源的初级侧和次级侧，并且被配置为将初级侧的第一电压转换为 二次电压为第二电压。 驱动器系统还包括第二双向DC-DC转换器，其具有耦合到DC电压源的初级侧和耦合到第一双向DC-DC转换器的次级侧的次级侧，并且被配置为 将初级侧的第一电压转换为次级的第三电压。 第一和第二双向DC-DC转换器能够提升第一电压，第二控制信号是第一控制信号的补码。 第二和第三电压之间的电压差包括包括第一控制信号的放大的输出电压。

    ELECTRICAL WAVEFORM FOR GAS TURBINE IGNITER
    9.
    发明申请
    ELECTRICAL WAVEFORM FOR GAS TURBINE IGNITER 审中-公开

    公开(公告)号：US20200018239A1

    公开(公告)日：2020-01-16

    申请号：US16033942

    申请日：2018-07-12

    Applicant: General Electric Company

    Inventor： Badri Narayan Ramamurthi ,  Karim Younsi ,  Andrey Meshkov ,  Jason Fredrick Trotter ,  Timothy John Sommerer ,  Ramanujam Ramabhadran ,  Alvaro Alexander Briceno ,  Charles Cook ,  Mark Wayne McWaters

    IPC: F02C7/266 ,  H01T15/00

    Abstract: The present disclosure relates to gas turbine engine operation in which an igniter assembly is provided with an electrical energy input (e.g., an electrical waveform) that is configured to increase a likelihood of igniting a fuel-air mixture surrounding the igniter assembly. In certain embodiments, the igniter assembly is supplied with an augmented electrical waveform that may reduce a quantity of sparks generated by the igniter assembly before successful light-off (e.g., ignition) of the fuel-air mixture is achieved (e.g., as compared to a quantity of sparks generated to achieve ignition by an igniter assembly that receives an electrical energy input in the form of a conventional electrical waveform). Accordingly, the augmented electrical waveform may reduce wear (e.g., via oxidation) on electrodes of the igniter assembly, such as a primary electrode (e.g., a center electrode) and a secondary electrode (e.g., an outer shell electrode) disposed about the primary electrode.

    Automatic short circuit protection switching device systems and methods
    10.
    发明授权
    Automatic short circuit protection switching device systems and methods 有权

    公开(公告)号：US10033298B1

    公开(公告)日：2018-07-24

    申请号：US15411422

    申请日：2017-01-20

    Applicant: General Electric Company

    Inventor： Ravisekhar Nadimpalli Raju ,  Ramanujam Ramabhadran ,  Ljubisa Dragoljub Stevanovic ,  William George Earls

    IPC: H02M7/217 ,  H02M1/32 ,  H02M1/08

    Abstract: Systems and methods for providing automatic short circuit protection in an electrical system via a switching device. In some embodiments, the switching device includes a switching transistor that selectively switches between an open position and a closed position based at least in part on a switching control signal, for example, to facilitate converting electrical power with first electrical characteristics output into electrical power with the second electrical characteristics. Additionally, the switching device includes a protection transistor electrically coupled in series with the switching transistor, in which a constant gate voltage is supplied to the protection transistor to maintain the first protection transistor in the closed position during operation of the power converter; and the protection transistor automatically limits current flow through the first switching device by reducing a gate voltage applied to the switching transistor when a short circuit is expected to be present in the electrical system.

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