利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

112 条记录 (耗时 0.028 秒)

    METHODS AND POWER CONVERSION SYSTEM CONTROL APPARATUS TO CONTROL IGBT JUNCTION TEMPERATURE AT LOW SPEED
    5.
    发明申请
    METHODS AND POWER CONVERSION SYSTEM CONTROL APPARATUS TO CONTROL IGBT JUNCTION TEMPERATURE AT LOW SPEED 有权
    方法和功率转换系统控制装置，以低速控制IGBT结温度

    公开(公告)号：US20160006367A1

    公开(公告)日：2016-01-07

    申请号：US14323070

    申请日：2014-07-03

    申请人： Lixiang Wei ,  Jiangang Hu ,  Jeffrey D. McGuire

    发明人： Lixiang Wei ,  Jiangang Hu ,  Jeffrey D. McGuire

    IPC分类号： H02M7/537

    CPC分类号： H02P27/08 ,  H02M5/4585 ,  H02M7/537 ,  H02M7/53875 ,  H02M2001/327 ,  H02P27/06

    摘要： Methods, apparatus and computer readable mediums are presented for controlling a multiphase inverter in which third harmonic injection pulse width modulation (THIPWM) is used for generating inverter switching control signals at or above a non-zero threshold inverter output frequency, and high frequency injection discontinuous pulse width modulation (HFIDPWM) is used for inverter output frequencies below the threshold, where the threshold frequency corresponds to a threshold period less than or equal to the thermal impedance time constant of the inverter switching devices, and the injected high frequency component for HFIDPWM corresponds to a common mode period less than the thermal impedance time constant to mitigate thermal stress on the inverter switches and low speed inverter output derating.

    摘要翻译： 提出了用于控制多相逆变器的方法，装置和计算机可读介质，其中使用三次谐波注入脉宽调制（THIPWM）来产生等于或高于非零阈值逆变器输出频率的变换器切换控制信号，以及高频注入不连续 脉冲宽度调制（HFIDPWM）用于低于阈值的逆变器输出频率，其中阈值频率对应于小于或等于逆变器开关装置的热阻抗时间常数的阈值周期，并且用于HFIDPWM的注入高频分量对应于 达到低于热阻时间常数的共模周期，以减轻逆变器开关上的热应力和低速逆变器输出降额。

    Methods and power conversion system control apparatus to control IGBT junction temperature at low speed
    6.
    发明授权
    Methods and power conversion system control apparatus to control IGBT junction temperature at low speed 有权
    方法和电力转换系统控制装置，以低速控制IGBT结温

    公开(公告)号：US09236828B1

    公开(公告)日：2016-01-12

    申请号：US14323070

    申请日：2014-07-03

    申请人： Lixiang Wei ,  Jiangang Hu ,  Jeffrey D. McGuire

    发明人： Lixiang Wei ,  Jiangang Hu ,  Jeffrey D. McGuire

    IPC分类号： H02P27/04 ,  H02P27/08 ,  H02M7/537 ,  H02P23/00 ,  H02J3/00 ,  H02M5/45 ,  H02M1/12 ,  H02P27/06

    CPC分类号： H02P27/08 ,  H02M5/4585 ,  H02M7/537 ,  H02M7/53875 ,  H02M2001/327 ,  H02P27/06

    摘要： Methods, apparatus and computer readable mediums are presented for controlling a multiphase inverter in which third harmonic injection pulse width modulation (THIPWM) is used for generating inverter switching control signals at or above a non-zero threshold inverter output frequency, and high frequency injection discontinuous pulse width modulation (HFIDPWM) is used for inverter output frequencies below the threshold, where the threshold frequency corresponds to a threshold period less than or equal to the thermal impedance time constant of the inverter switching devices, and the injected high frequency component for HFIDPWM corresponds to a common mode period less than the thermal impedance time constant to mitigate thermal stress on the inverter switches and low speed inverter output derating.

    摘要翻译： 提出了用于控制多相逆变器的方法，装置和计算机可读介质，其中使用三次谐波注入脉宽调制（THIPWM）来产生等于或高于非零阈值逆变器输出频率的变换器切换控制信号，以及高频注入不连续 脉冲宽度调制（HFIDPWM）用于低于阈值的逆变器输出频率，其中阈值频率对应于小于或等于逆变器开关装置的热阻抗时间常数的阈值周期，并且用于HFIDPWM的注入高频分量对应于 达到低于热阻时间常数的共模周期，以减轻逆变器开关上的热应力和低速逆变器输出降额。

    Fault identification techniques for high resistance grounded systems
    7.
    发明授权
    Fault identification techniques for high resistance grounded systems 有权
    高电阻接地系统的故障识别技术

    公开(公告)号：US09091742B2

    公开(公告)日：2015-07-28

    申请号：US13400537

    申请日：2012-02-20

    申请人： Lixiang Wei ,  Zhijun Liu

    发明人： Lixiang Wei ,  Zhijun Liu

    IPC分类号： G01R31/00 ,  G01R31/42 ,  G01R31/02

    CPC分类号： G01R31/42 ,  G01R31/025

    摘要： The present techniques include methods and systems for detecting a high resistive ground fault condition in an HRG system. Embodiments include systems and methods of measuring drive voltages and detecting voltage changes in the drive once the drive is in operation, particularly for drives operating at relatively low voltages and frequencies. In some embodiments, an integrator is utilized to detect peaks in the measured voltage changes. Relatively small ground currents are also measured to determine HRG faults. Moreover, in some embodiments, the detection of an HRG fault for one of several motor drives provide indication for the particular motor drive in fault.

    摘要翻译： 本技术包括用于检测HRG系统中的高电阻接地故障状况的方法和系统。 实施例包括测量驱动电压并检测驱动器运行中的电压变化的系统和方法，特别是对于在较低电压和频率下工作的驱动器。 在一些实施例中，使用积分器来检测所测量的电压变化中的峰值。 还测量相对较小的接地电流以确定HRG故障。 此外，在一些实施例中，几个电动机驱动器之一的HRG故障的检测为故障中的特定电机驱动器提供指示。

    FAULT IDENTIFICATION TECHNIQUES FOR HIGH RESISTANCE GROUNDED SYSTEMS
    10.
    发明申请
    FAULT IDENTIFICATION TECHNIQUES FOR HIGH RESISTANCE GROUNDED SYSTEMS 有权
    高电压接地系统的故障识别技术

    公开(公告)号：US20130218491A1

    公开(公告)日：2013-08-22

    申请号：US13400537

    申请日：2012-02-20

    申请人： Lixiang Wei ,  Zhijun Liu

    发明人： Lixiang Wei ,  Zhijun Liu

    IPC分类号： G01R31/12 ,  G01R31/14

    CPC分类号： G01R31/42 ,  G01R31/025

    摘要： The present techniques include methods and systems for detecting a high resistive ground fault condition in an HRG system. Embodiments include systems and methods of measuring drive voltages and detecting voltage changes in the drive once the drive is in operation, particularly for drives operating at relatively low voltages and frequencies. In some embodiments, an integrator is utilized to detect peaks in the measured voltage changes. Relatively small ground currents are also measured to determine HRG faults. Moreover, in some embodiments, the detection of an HRG fault for one of several motor drives provide indication for the particular motor drive in fault.

    摘要翻译： 本技术包括用于检测HRG系统中的高电阻接地故障状况的方法和系统。 实施例包括测量驱动电压并检测驱动器运行中的电压变化的系统和方法，特别是对于在较低电压和频率下工作的驱动器。 在一些实施例中，使用积分器来检测所测量的电压变化中的峰值。 还测量相对较小的接地电流以确定HRG故障。 此外，在一些实施例中，几个电动机驱动器之一的HRG故障的检测为故障中的特定电机驱动器提供指示。