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    Electric starter generator system employing bidirectional buck-boost power converters, and methods therefor
    32.
    发明授权
    Electric starter generator system employing bidirectional buck-boost power converters, and methods therefor 有权
    采用双向降压 - 升压功率转换器的起动发电机系统及其方法

    公开(公告)号：US07327113B2

    公开(公告)日：2008-02-05

    申请号：US10990193

    申请日：2004-11-15

    申请人： Robert Louis Steigerwald ,  Luis Jose Garces ,  Matthew Christopher Bringman

    发明人： Robert Louis Steigerwald ,  Luis Jose Garces ,  Matthew Christopher Bringman

    IPC分类号： G05B11/28

    CPC分类号： H02M3/1582

    摘要： A bidirectional buck-boost power converter 13 including a pair of inverter modules 14, 15 disposed at an output of a machine, and an inductor Lo connected between the pair of inverter modules 14, 15. A method for controlling a voltage output of a machine starter generator having an inverter rectifier and bidirectional buck-boost converter, includes outputting a dc voltage controlled by bidirectional buck-boost pulse width modulation (PWM) switching control, when the starter generator is in a generator mode.

    摘要翻译： 双向降压 - 升压功率转换器13，包括设置在机器的输出端的一对逆变器模块14,15和连接在该对逆变器模块14,15之间的电感器L o o。 一种用于控制具有逆变器整流器和双向降压 - 升压转换器的机器起动器发电机的电压输出的方法，包括：当起动器发生器处于...时，输出由双向降压 - 升压脉宽调制（PWM）切换控制控制的直流电压 发电机模式。

    Gradient amplifier system
    34.
    发明授权
    Gradient amplifier system 有权
    梯度放大器系统

    公开(公告)号：US08502539B2

    公开(公告)日：2013-08-06

    申请号：US13076823

    申请日：2011-03-31

    申请人： Rixin Lai ,  Luis Jose Garces ,  Juan Antonio Sabate ,  Juan Manuel Rivas Davila ,  Song Chi ,  Wesley Michael Skeffington

    发明人： Rixin Lai ,  Luis Jose Garces ,  Juan Antonio Sabate ,  Juan Manuel Rivas Davila ,  Song Chi ,  Wesley Michael Skeffington

    IPC分类号： G01V3/00

    CPC分类号： G01R33/3852

    摘要： A gradient amplifier system is presented. An embodiment of a gradient amplifier system that includes a power stage having a plurality of bridge amplifiers, where each of the plurality of bridge amplifiers operates at a first switching frequency. The gradient amplifier system further includes a gradient coil coupled to an output terminal of the power stage and configured to produce a magnetic field proportional to a coil current signal supplied by the power stage. In addition, the gradient amplifier system includes a controller stage coupled to an input terminal of the power stage and configured to generate a pulse width modulated gate signal based on the coil current signal and a reference current signal, where the pulse width modulated gate signal is generated at a second switching frequency upon occurrence of a slew rate associated with the reference current signal is below a determined threshold rate and an amplitude level associated with the reference current signal is above a determined level. Further, the controller stage is configured to apply the generated pulse width modulated gate signal to the power stage for changing an operating frequency of each of the plurality of bridge amplifiers from the first switching frequency to the second switching frequency.

    摘要翻译： 提出了一种梯度放大器系统。 一种梯度放大器系统的实施例，其包括具有多个桥接放大器的功率级，其中多个桥接放大器中的每一个以第一开关频率工作。 梯度放大器系统还包括耦合到功率级的输出端并被配置为产生与由功率级提供的线圈电流信号成比例的磁场的梯度线圈。 此外，梯度放大器系统包括耦合到功率级的输入端子并被配置为基于线圈电流信号和参考电流信号产生脉宽调制门信号的控制器级，其中脉宽调制门信号为 在与参考电流信号相关联的转换速率出现时以第二开关频率产生的信号低于所确定的阈值速率，并且与参考电流信号相关联的幅度电平高于所确定的电平。 此外，控制级被配置为将产生的脉宽调制门信号施加到功率级，用于将多个桥接放大器中的每一个的工作频率从第一开关频率改变为第二开关频率。

    Cryogenic exciter
    35.
    发明授权
    Cryogenic exciter 失效
    低温激振器

    公开(公告)号：US08134345B2

    公开(公告)日：2012-03-13

    申请号：US11288551

    申请日：2005-11-29

    申请人： James William Bray ,  Luis Jose Garces

    发明人： James William Bray ,  Luis Jose Garces

    IPC分类号： H02P9/10 ,  H02P9/14 ,  H02P11/00 ,  H02P9/00 ,  H02H7/06

    CPC分类号： H02K55/04 ,  H02K19/38 ,  Y02E40/625

    摘要： The disclosed technology is a cryogenic static exciter. The cryogenic static exciter is connected to a synchronous electric machine that has a field winding. The synchronous electric machine is cooled via a refrigerator or cryogen like liquid nitrogen. The static exciter is in communication with the field winding and is operating at ambient temperature. The static exciter receives cooling from a refrigerator or cryogen source, which may also service the synchronous machine, to selected areas of the static exciter and the cooling selectively reduces the operating temperature of the selected areas of the static exciter.

    摘要翻译： 所公开的技术是低温静电激励器。 低温静态励磁机连接到具有励磁绕组的同步电机。 同步电机通过冰箱或冷冻液如液氮冷却。 静态励磁器与励磁绕组连通，并在环境温度下工作。 静态激励器从也可以将同步机服务的冰箱或致冷剂源的静止激励器的选定区域接收冷却，并且冷却选择性地降低静态励磁机的选定区域的工作温度。

    System and method for charging and discharging a superconducting coil
    36.
    发明授权
    System and method for charging and discharging a superconducting coil 失效
    超导线圈充放电的系统和方法

    公开(公告)号：US07336059B2

    公开(公告)日：2008-02-26

    申请号：US11273984

    申请日：2005-11-15

    申请人： Robert Louis Steigerwald ,  Luis Jose Garces

    发明人： Robert Louis Steigerwald ,  Luis Jose Garces

    IPC分类号： G05F1/62 ,  G05F1/59

    CPC分类号： H01F6/006 ,  H02M3/158 ,  H02M3/3353 ,  H02M2001/007 ,  H02M2003/1555

    摘要： A system and method for charging and discharging a superconducting coil. The system comprising a boost converter coupled between a low-voltage bus and a high voltage bus, and a buck converter coupled between the high-voltage bus and the coil. The system being configured to charge and discharge the coil without reversing the current while reversing polarity, and to only supply high-voltages when necessary. The system further comprising means to dissipate excess energy during discharge. The method comprising pulse width modulating the solid-state switch of a boost converter to achieve a high-voltage from a low-voltage and then switching solid-state switches of a buck regulator to charge or discharge the coil in a non current reversing, polarity reversing manner.

    摘要翻译： 一种用于对超导线圈充电和放电的系统和方法。 该系统包括耦合在低电压总线和高压总线之间的升压转换器以及耦合在高压总线和线圈之间的降压转换器。 该系统被配置为对线圈进行充电和放电，而不反转电流，同时反转极性，并且仅在必要时提供高电压。 该系统还包括在放电期间耗散多余能量的装置。 该方法包括对升压转换器的固态开关进行脉宽调制，以实现低电压的高电压，然后切换降压调节器的固态开关，以在非电流反向极性中对线圈充电或放电 反转的方式。

    Method and system for detecting a zero current level in a line commutated converter
    38.
    发明授权
    Method and system for detecting a zero current level in a line commutated converter 有权
    用于检测线路整流转换器中的零电流电平的方法和系统

    公开(公告)号：US06385066B1

    公开(公告)日：2002-05-07

    申请号：US09702642

    申请日：2000-11-01

    申请人： Luis Jose Garces ,  Vinod John ,  Peter Claudius Sanza ,  Paul Michael Szczesny

    发明人： Luis Jose Garces ,  Vinod John ,  Peter Claudius Sanza ,  Paul Michael Szczesny

    IPC分类号： H02M542

    CPC分类号： H02M1/32 ,  H02M7/1623 ,  H02M2001/0012

    摘要： A method and system for determining zero current level occurrences in a reversible power converter without requiring additional component complexity and costs. A digital controller selectively determines the line to line voltage for the most recently fired thyristor pair. The selected line to line voltage is identified as the bridge reconstruction voltage and is compared against the actual bridge output voltage for the conducting bridge. The difference between the two voltage signals is identified as the bridge error voltage and the sign of its magnitude is indicative of a load current zero level occurrence. A zero current level occurrence happens whenever the bridge error voltage drops below zero. This indication is positive and substantially instantaneous and safely enables the reversal of power flow without the risk of line faults due to cross-bridge short circuits.

    摘要翻译： 用于确定可逆功率转换器中的零电流电平发生的方法和系统，而不需要额外的组件复杂性和成本。 数字控制器选择性地确定最近烧制的晶闸管对的线间电压。 所选择的线间电压被确定为桥重建电压，并与导电桥的实际桥输出电压进行比较。 两个电压信号之间的差异被识别为桥接误差电压，其大小的符号表示负载电流零电平发生。 每当桥接误差电压低于零时，就会发生零电流电平。 该指示是正的并且基本上是瞬时的并且安全地实现功率流的反转，而不会由于交叉桥短路而导致线路故障的风险。

    Microturbine based power generation system and method
    39.
    发明授权
    Microturbine based power generation system and method 失效
    基于微型涡轮发电系统及方法

    公开(公告)号：US06281595B1

    公开(公告)日：2001-08-28

    申请号：US09617955

    申请日：2000-09-25

    申请人： Gautam Sinha ,  Michael John Ryan ,  Luis Jose Garces

    发明人： Gautam Sinha ,  Michael John Ryan ,  Luis Jose Garces

    IPC分类号： F02N1106

    CPC分类号： H02P1/30 ,  F01D15/10 ,  F02C7/268 ,  F05D2250/82

    摘要： A power electrical system is disclosed to connect a microturbine and an electrical machine to electrical power sources and a load. The invention permits the microturbine to be started using an external DC power source and/or an external AC power source. DC power is converted to AC power by means of a buck-boost chopper, DC bus and a DC-to-AC converter. AC power, from the AC power source, is converted to frequencies and voltages suitable to start a microturbine by a pair of DC-to-AC converters and the DC bus. The frequency and voltage levels of the AC power are gradually increased to accelerate the microturbine to startup speed. Once the microturbine is started, the external power sources are disconnected, and the DC bus and the DC-to-AC converters produce output AC power at a voltage level and frequency to match an electrical load.

    摘要翻译： 公开了一种电力电气系统，其将微型涡轮机和电机连接到电源和负载。 本发明允许使用外部DC电源和/或外部AC电源来启动微型涡轮机。 直流电源通过降压 - 升压斩波器，直流母线和直流 - 交流转换器转换成交流电源。 来自交流电源的交流电源被转换成适合于通过一对DC-AC转换器和DC总线启动微型涡轮机的频率和电压。 交流电源的频率和电压电平逐渐增加，以加速微型涡轮机的启动速度。 一旦启动了微型涡轮机，外部电源就被断开，直流总线和直流到交流转换器产生一个电压电平和频率的输出交流电源，以匹配一个电气负载。