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9 条记录 (耗时 0.012 秒)

    MRI magnet assembly with non-conductive inner wall
    1.
    发明公开
    MRI magnet assembly with non-conductive inner wall 有权
    Magnetanordnungfürdie bildgebende Magnetresonanz mit nichtleitender innererGefässwand

    公开(公告)号：EP0981057A3

    公开(公告)日：2001-10-17

    申请号：EP99306140.7

    申请日：1999-08-03

    申请人： GENERAL ELECTRIC COMPANY

    发明人： Hedeen, Robert Arvin ,  El-Hamamsy, Sayed-Amr ,  Herd, Kenneth Gordon ,  Edelstein, William Alan ,  Ackermann, Robert Adolph

    IPC分类号： G01R33/3815 ,  G01R33/385

    CPC分类号： G01R33/3854 ,  G01R33/3815 ,  Y10S505/879 ,  Y10S505/893 ,  Y10S505/898

    摘要： An MR magnet assembly (10) includes a cylindrical vessel for housing a superconducting magnet and having a vacuum between its inner and outer walls (14,13). The vessel defines a magnet bore (36) for receiving a patient to be imaged. A gradient coil assembly (66) is mounted in the bore adjacent the inner wall (14) of the magnet assembly. To reduce gradient coil noise, the inner wall is constructed of a nonconductive material which does not support eddy currents.

    摘要翻译： MR磁体组件（10）包括用于容纳超导磁体并且在其内壁和外壁之间具有真空的圆柱形容器（14,3）。 容器限定用于接收待成像的患者的磁体孔（36）。 梯度线圈组件（66）安装在与磁体组件的内壁（14）相邻的孔中。 为了减少梯度线圈噪声，内壁由不支持涡流的非导电材料构成。

    Power factor correction circuit
    5.
    发明公开
    Power factor correction circuit 失效
    功率因数校正电路

    公开(公告)号：EP0377510A3

    公开(公告)日：1991-10-09

    申请号：EP90300095.8

    申请日：1990-01-04

    申请人： GENERAL ELECTRIC COMPANY

    发明人： Borowiec, Joseph Christopher ,  El-Hamamsy, Sayed-Amr

    IPC分类号： G05F1/70 ,  H05B41/29

    CPC分类号： H02M1/425 ,  H02M2001/4275 ,  H05B41/28 ,  Y02B70/126

    摘要： A power factor correction circuit employs a metal oxide varistor (24) in series with a filter capacitor (C1). The varistor (24) provides a low-impedance path for pre-charging the filter capacitor (C1), thus enabling the avoidance of high inrush current to circuit devices, while the filter capacitor (C1) energizes the circuit when the capacitor voltage exceeds the AC source (10) voltage. The circuit is insensitive to normal line transients. One application is for use in a gas discharge lamp (14) ballast.

    Power factor correction circuit
    6.
    发明公开
    Power factor correction circuit 失效
    Leistungsfaktorkompensationsschaltung。

    公开(公告)号：EP0377510A2

    公开(公告)日：1990-07-11

    申请号：EP90300095.8

    申请日：1990-01-04

    申请人： GENERAL ELECTRIC COMPANY

    发明人： Borowiec, Joseph Christopher ,  El-Hamamsy, Sayed-Amr

    IPC分类号： G05F1/70 ,  H05B41/29

    CPC分类号： H02M1/425 ,  H02M2001/4275 ,  H05B41/28 ,  Y02B70/126

    摘要： A power factor correction circuit employs a metal oxide varistor (24) in series with a filter capacitor (C1). The varistor (24) provides a low-impedance path for pre-charging the filter capacitor (C1), thus enabling the avoidance of high inrush current to circuit devices, while the filter capacitor (C1) energizes the circuit when the capacitor voltage exceeds the AC source (10) voltage. The circuit is insensitive to normal line transients. One application is for use in a gas discharge lamp (14) ballast.

    摘要翻译： 功率因数校正电路使用与滤波电容器（C1）串联的金属氧化物变阻器（24）。 变阻器（24）提供用于对滤波电容器（C1）进行预充电的低阻抗路径，从而能够避免对电路器件的高浪涌电流，而当电容器电压超过电容器电压时，滤波电容器（C1）使电路通电 交流电源（10）电压。 电路对正常线路瞬变不敏感。 一种应用用于气体放电灯（14）镇流器。

    Radio frequency coil for open magnetic resonance imaging system
    7.
    发明公开
    Radio frequency coil for open magnetic resonance imaging system 审中-公开
    Radiofrequenzspulefürein offenes System de bildgebenden magnetischen Resonanz

    公开(公告)号：EP1115005A2

    公开(公告)日：2001-07-11

    申请号：EP00310654.9

    申请日：2000-11-30

    申请人： GENERAL ELECTRIC COMPANY

    发明人： Schenck, John Frederick ,  Watkins, Ronald Dean ,  Edelstein, William Alan ,  El-Hamamsy, Sayed-Amr ,  Boskamp, Eddy Benjamin ,  Giaquinto, Randy Otto ,  Mallick, John Andrew

    IPC分类号： G01R33/34 ,  G01R33/36

    CPC分类号： G01R33/3415 ,  G01R33/34061 ,  G01R33/3806

    摘要： A quadrature coil (24) suitable for use with an open frame MRI system provides crossing pairs of arrays (32a-32d) of parallel conductor elements (34a-34d), respectively. Compact configuration is provided through use of an isolating circuit (66) for incorporating parasitic capacitances at the resonance frequency of the coil into a blocking parallel resonance. Termination of the parallel conductor elements may be accomplished by equal impedance node connectors formed from branching pairs of conductors or a triangular least resistance connection form. RF shields are provided by pairs of conductive sheets containing eddy current reducing slots aligned with the parallel conductors elements of the coil.

    摘要翻译： 适合与开放式MRI系统一起使用的正交线圈（24）分别提供平行导体元件（34a-34d）的交替的阵列对（32a-32d）。 通过使用用于将线圈的谐振频率处的寄生电容并入阻塞并联谐振的隔离电路（66）来提供紧凑配置。 并联导体元件的端接可以通过由分支对导体或三角形最小电阻连接形式形成的等阻抗节点连接器来实​​现。 RF屏蔽件由包含与线圈的平行导体元件对准的涡流减小槽的导电片构成。

    MRI magnet assembly with non-conductive inner wall
    8.
    发明公开
    MRI magnet assembly with non-conductive inner wall 有权
    魔杖魔杖魔杖

    公开(公告)号：EP0981057A2

    公开(公告)日：2000-02-23

    申请号：EP99306140.7

    申请日：1999-08-03

    申请人： GENERAL ELECTRIC COMPANY

    发明人： Hedeen, Robert Arvin ,  El-Hamamsy, Sayed-Amr ,  Herd, Kenneth Gordon ,  Edelstein, William Alan ,  Ackermann, Robert Adolph

    IPC分类号： G01R33/3815

    CPC分类号： G01R33/3854 ,  G01R33/3815 ,  Y10S505/879 ,  Y10S505/893 ,  Y10S505/898

    摘要： An MR magnet assembly (10) includes a cylindrical vessel for housing a superconducting magnet and having a vacuum between its inner and outer walls (14,13). The vessel defines a magnet bore (36) for receiving a patient to be imaged. A gradient coil assembly (66) is mounted in the bore adjacent the inner wall (14) of the magnet assembly. To reduce gradient coil noise, the inner wall is constructed of a nonconductive material which does not support eddy currents.

    摘要翻译： MR磁体组件（10）包括用于容纳超导磁体并且在其内壁和外壁之间具有真空的圆柱形容器（14,3）。 容器限定用于接收待成像的患者的磁体孔（36）。 梯度线圈组件（66）安装在与磁体组件的内壁（14）相邻的孔中。 为了减少梯度线圈噪声，内壁由不支持涡流的非导电材料构成。

    Dual feedback control for a high-efficiency class-D power amplifier circuit
    9.
    发明公开
    Dual feedback control for a high-efficiency class-D power amplifier circuit 失效
    对于具有高效率的双反馈D类功率放大器控制电路。

    公开(公告)号：EP0529901A1

    公开(公告)日：1993-03-03

    申请号：EP92307496.7

    申请日：1992-08-14

    申请人： GENERAL ELECTRIC COMPANY

    发明人： El-Hamamsy, Sayed-Amr

    IPC分类号： H05B41/29 ,  H02M7/538 ,  H03F3/217

    CPC分类号： H05B41/2806 ,  Y02B20/22

    摘要： A dual feedback control system for a Class-D power circuit maximizes efficiency by controlling the magnitude and phase angle of the resonant load circuit using two separate feedback loops. The first feedback loop 40 changes the value of a first variable capacitor in response to difference in magnitude between the actual load impedance and the desired load impedance. The second feedback loop 30 changes the value of a second variable capacitor in response to the phase difference between the actual phase angle and the desired phase angle. In this way, the real and imaginary components of the load impedance are controlled so that the Class-D circuit is in tune , and hence efficiency is maximized, over a wide range of load impedances. The dual feedback control of the present invention may be advantageously employed in the ballast of an electrodeless HID lamp system.

    摘要翻译： 用于D类功率电路的双反馈控制系统，通过控制使用两个单独的反馈回路的谐振负载电路的幅度和相角使效率最大化。 第一反馈回路40改变响应于实际的负载阻抗和期望的负载阻抗之间的幅度差的第一可变电容器的值。 第二反馈回路30将响应于实际相位角和期望的相位角之间的相位差的第二可变电容器的值。 以这种方式，负载阻抗的实分量和虚分量被控制以便做了D类电路在调，并因此效率被最大化，在宽范围的负载阻抗。 本发明的双反馈控制可在无电极HID灯系统的镇流器被有利地使用。