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公开(公告)号：US5530396A
公开(公告)日：1996-06-25
申请号：US308806
申请日：1994-09-19
申请人： Vlatko Vlatkovic , Fred C. Lee , Dusan Borojevic
发明人： Vlatko Vlatkovic , Fred C. Lee , Dusan Borojevic
CPC分类号： H02M1/44 , G05F1/70 , H02M1/12 , H03H1/0007 , H03H7/1758 , Y02P80/112
摘要： An active damping circuit for an electromagnetic interference (EMI) filter for power factor correction (PFC) circuit is provided which simulates a line damping impedance which actively varies according to sensed line current. The active damping circuit comprises an nth-order, Cauer-Chebyshev, low-pass filter having input series damping impedance (Z.sub.d) simulated with a power operational amplifier and high-frequency isolation transformer. The simulated damping impedance offers greatly reduced size and power dissipation as compared to prior art passive schemes which typically require large impedance components for damping. A passive damping circuit is also shown which involves providing an alternate inductive current path in parallel with a damping resistor whereby lower frequency currents are diverted through the alternate current path and higher frequency currents continue to flow through the damping resistor. In this manner, the damping action of the damping resistor is attenuated for lower frequencies but remains unaffected for higher frequencies.
摘要翻译： 提供了一种用于功率因数校正（PFC）电路的电磁干扰（EMI）滤波器的主动阻尼电路，其模拟根据感测到的线路电流而主动变化的线路阻尼阻抗。 主动阻尼电路包括具有由功率运算放大器和高频隔离变压器模拟的输入串联阻尼阻抗（Zd）的n阶Cauer-Chebyshev低通滤波器。 与现有技术的无源方案相比，仿真的阻尼阻抗大大减小了尺寸和功耗，通常需要较大的阻抗阻抗元件。 还示出了被动阻尼电路，其包括提供与阻尼电阻并联的可选感应电流路径，由此较低频率电流通过交流电流路径转向，并且较高频率电流继续流过阻尼电阻器。 以这种方式，衰减电阻器的阻尼作用对于较低的频率衰减，但对于较高的频率保持不受影响。
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2.发明授权Zero-voltage-switched, three-phase pulse-width-modulating switching rectifier with power factor correction 失效具有功率因数校正的零电压开关，三相脉宽调制开关整流器
公开(公告)号：US5329439A
公开(公告)日：1994-07-12
申请号：US898900
申请日：1992-06-15
申请人： Dusan Borojevic , Fred C. Lee , Vlatko Vlatkovic
发明人： Dusan Borojevic , Fred C. Lee , Vlatko Vlatkovic
CPC分类号： H02M1/4233 , H02M3/28 , H02M5/271 , Y02B70/126
摘要： A three-phase, pulse-width-modulated, switching rectifier, with zero-voltage-switching.
摘要翻译： 具有零电压开关的三相，脉宽调制开关整流器。
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公开(公告)号：US06181765B2
公开(公告)日：2001-01-30
申请号：US09208874
申请日：1998-12-10
申请人： Rok Sribar , Vlatko Vlatkovic
发明人： Rok Sribar , Vlatko Vlatkovic
IPC分类号： A61B600
CPC分类号： A61B6/032 , A61B6/4014 , A61B6/4028 , A61B6/4488 , H05G1/02
摘要： An X-ray tube assembly includes a hermetically-sealed annular frame, spaced apart cathode and anode rings and an electron excitation device. The frame surrounds an exterior central passage for receiving a patient therethrough and has an interior chamber with a vacuum and an X-ray transparent window ring surrounding the central passage. The cathode and anode rings are stationarily mounted to the frame and disposed within the interior chamber. The cathode ring has circumferentially arranged side-by-side filaments each separately excitable by the electron excitation device to cause flow of electrons in an e-beam to a target portion of the anode ring such that an X-ray beam is produced that exits the interior chamber passing through the transparent window ring and that can be moved around the patient disposed within the central passage.
摘要翻译： X射线管组件包括密封的环形框架，间隔开的阴极和阳极环以及电子激发装置。 框架围绕外部中央通道用于接纳患者，并且具有包围真空的内部腔室和围绕中央通道的X射线透明窗口环。 阴极和阳极环固定地安装到框架并且设置在内部室内。 阴极环具有周向布置的并排的细丝，每个细丝可以由电子激发装置分别激发，以使电子束中的电子流向阳极环的目标部分，从而产生出射出的X射线束 内部室通过透明窗环，并且可以围绕设置在中央通道内的患者移动。
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公开(公告)号：US06534949B2
公开(公告)日：2003-03-18
申请号：US09822303
申请日：2001-03-29
IPC分类号： H02M75387
CPC分类号： H02M7/487 , H02M2007/53876
摘要： A high power motor drive converter comprises: a three level neutral point clamped (NPC) output power conversion stage including switches for supplying power to an AC drive motor; a split series connected DC capacitor bank coupled in parallel with the NPC output power conversion stage; and a controller for selecting switch positions for controlling the NPC output power conversion stage and compensating for a neutral point voltage imbalance of the DC capacitor bank by adjusting amplitudes of carrier voltages according to an amount of voltage imbalance in the split series connected DC capacitor bank.
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公开(公告)号：US6058031A
公开(公告)日：2000-05-02
申请号：US108044
申请日：1998-06-30
申请人： James Patrick Lyons , Vlatko Vlatkovic , Paul Martin Espelage , Albert Andreas Maria Esser , Yifan Zhao , Fei Fred Wang, Sr.
发明人： James Patrick Lyons , Vlatko Vlatkovic , Paul Martin Espelage , Albert Andreas Maria Esser , Yifan Zhao , Fei Fred Wang, Sr.
CPC分类号： H02M7/487 , H02M7/5395 , H02P27/14
摘要： A high power motor drive converter includes: a five level hybrid NPC output power conversion stage including three NPC phase bridges having switches and coupled in a wye configuration through a converter neutral point, each NPC phase bridge receiving power on a respective direct current bus; three isolated split series-connected DC capacitor banks each coupled in parallel to a respective one of the three NPC phase bridges; and a controller for selecting switch positions with active control of neutral voltages. The controller is adapted to select switch positions using feedforward sine-triangle modulation with third harmonic injection, zero sequence injection, and/or discontinuous modulation injection.
摘要翻译： 大功率电动机驱动转换器包括：五级混合NPC输出功率转换级，包括具有开关的三个NPC相桥，并且通过转换器中性点以叶状配置耦合，每个NPC相桥在相应的直流母线上接收功率; 三个隔离的串联连接的直流电容器组，其分别与三个NPC相桥中的相应一个并联耦合; 以及用于选择具有中性电压的主动控制的开关位置的控制器。 控制器适于使用具有三次谐波注入，零序注入和/或不连续调制注入的前馈正弦三角调制来选择开关位置。
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公开(公告)号：US5432695A
公开(公告)日：1995-07-11
申请号：US123367
申请日：1993-09-17
申请人： Vlatko Vlatkovic , Dusan Borojevic , Fred C. Lee
发明人： Vlatko Vlatkovic , Dusan Borojevic , Fred C. Lee
CPC分类号： H02M7/162 , H02M7/219 , Y02B70/1441
摘要： A novel switching rectifier circuit that combines the conventional three-phase, 6-stepped PWM rectifier/inverter circuit with a simple, low-power switch commutation circuit to provide zero-voltage turn-on for the switches, and soft turn-off for the diodes. The main features of the new circuit include elimination of switching losses on the power switches and reverse recovery problems on the diodes, elimination of the need for any snubbers in the three-phase bridge, possibility of use of slower diodes in the power bridge, constant frequency operation, and no increase in component current and voltage stresses over the conventional PWM rectifier.
摘要翻译： 一种新颖的开关整流电路，其结合了传统的三相6级PWM整流器/逆变器电路和简单的低功耗开关换向电路，为开关提供零电压开启，以及软关断 二极管。 新电路的主要特征包括消除功率开关上的开关损耗和二极管上的反向恢复问题，消除了三相桥中任何缓冲器的需要，在功率桥中使用较慢二极管的可能性恒定 频率操作，并且在常规PWM整流器上不会增加元件电流和电压应力。
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公开(公告)号：US5982646A
公开(公告)日：1999-11-09
申请号：US108043
申请日：1998-06-30
CPC分类号： H02M7/487 , H02M1/34 , H02M2001/346 , Y02B70/1491
摘要： A three-level NPC converter includes at least one phase leg including four series coupled electrical switches having a first pair junction between the first two switches and a second pair junction between the second two switches. First and second inner switch snubber capacitors are coupled in series at a neutral junction. First and second inner switch snubber diodes are respectively coupled to the first and second pair junctions and respectively coupled at first and second inner diode-capacitor junctions to the first and second inner switch snubber capacitors. First and second inner switch snubber resistors are respectively coupled between the first and second inner diode-capacitor junctions and respective portions of a DC bus. In one embodiment, the NPC converter further includes first and second outer switch snubber diodes coupled between respective first and second inner diode-capacitor junctions and respective portions of the DC bus. This embodiment may further include first and second outer switch snubber capacitors coupled in parallel with respective first and second inner switch snubber capacitors.
摘要翻译： 三电平NPC转换器包括至少一个相位支路，包括四个串联耦合的电开关，该电气开关具有在前两个开关之间的第一对结和第二个两个开关之间的第二对结。 第一和第二内部开关缓冲电容器在中性点处串联耦合。 第一和第二内部开关缓冲二极管分别耦合到第一和第二对结，并且分别在第一和第二内部二极管 - 电容器结处耦合到第一和第二内部开关缓冲电容器。 第一和第二内部开关缓冲电阻分别耦合在第一和第二内部二极管 - 电容器接头和DC总线的相应部分之间。 在一个实施例中，NPC转换器还包括耦合在相应的第一和第二内部二极管 - 电容器结之间的第一和第二外部开关缓冲二极管以及DC总线的相应部分。 该实施例还可以包括与相应的第一和第二内部开关缓冲电容器并联耦合的第一和第二外部开关缓冲电容器。
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公开(公告)号：US5910892A
公开(公告)日：1999-06-08
申请号：US108041
申请日：1998-06-30
IPC分类号： H02M7/48 , H02M7/487 , H02M7/5387
CPC分类号： H02M7/487 , H02M2007/53876
摘要： A high power motor drive converter includes a three level neutral point clamped (NPC) output power conversion stage including switches; a split series connected DC capacitor bank coupled in parallel with the NPC output power conversion stage; and a controller for selecting switch positions for controlling the NPC output power conversion stage and controlling a neutral voltage balance of the DC capacitor bank by using space vector modulation and predictive charge calculations.
摘要翻译： 大功率电动机驱动转换器包括三级中性点钳位（NPC）输出功率转换级，包括开关; 与NPC输出功率转换级并联耦合的分立串联直流电容器组; 以及用于选择用于控制NPC输出功率转换级的开关位置并通过使用空间矢量调制和预测电荷计算来控制DC电容器组的中性电压平衡的控制器。
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9.发明授权Method and system for real-time prediction of zero crossings of fault currents 有权用于实时预测故障电流零交叉的方法和系统公开(公告)号：US06597999B1
公开(公告)日：2003-07-22
申请号：US09467139
申请日：1999-12-20
IPC分类号： G01R1900
CPC分类号： H01H9/56 , H01H33/006
摘要： A method for predicting zero crossings of fault currents in a multi-phase power system includes sensing a fault current in each respective phase, estimating parameters of a model of each respective fault current, and independently using the estimated parameters for each respective fault current to predict a zero crossing of the respective fault current.
摘要翻译： 一种用于预测多相电力系统中的故障电流过零点的方法包括感测每个相位中的故障电流，估计每个相应故障电流的模型的参数，并且独立地使用每个相应故障电流的估计参数来预测 相应故障电流的过零点。
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公开(公告)号：US06178099B1
公开(公告)日：2001-01-23
申请号：US09545449
申请日：2000-04-07
IPC分类号： H02M3337
CPC分类号： H02M3/3376 , H02M2001/0058 , H02M2007/53878 , Y02B70/1433 , Y02B70/1441 , Y02B70/1491
摘要： An optimal phase-shifted control for a series resonant converter involves instantaneous monitoring of state variables (resonant capacitor voltage resonant inductor current and output voltage) and implementation of a control law for providing a quasi-squarewave-with-maximum-coasting (QSWMC) mode of operation. The control law uses the instantaneous resonant inductor current, the instantaneous resonant capacitor voltage and the output voltage to determine the optimal time to perform switching events in order to operate on a desired control trajectory. The QSWMC converter operates at a minimized frequency in a super-resonant mode with zero-voltage switching, minimized electrical stresses, and reduced electromagnetic interference due to nearly sinusoidal resonant tank currents.
摘要翻译： 用于串联谐振转换器的最佳相移控制包括对状态变量（谐振电容器电压谐振电感器电流和输出电压）的瞬时监测以及用于提供准方波最大惯性（QSWMC）模式的控制律的实现 的操作。 控制律使用瞬时谐振电感电流，瞬时谐振电容电压和输出电压来确定执行切换事件的最佳时间，以便在所需的控制轨迹上运行。 QSWMC转换器在具有零电压开关，最小化电应力的超谐振模式中以最小频率工作，并且由于几乎正弦谐振槽电流而导致的电磁干扰减小。
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