公开(公告)号：US10340733B2

公开(公告)日：2019-07-02

申请号：US14615814

申请日：2015-02-06

申请人： Liebert Corporation

发明人： Edwin Shires ,  Terry D. Bush ,  Brian P. Heber ,  Charles F. Blair

IPC分类号： H02J9/00 ,  H02J9/06

摘要： A common mode choke in a 3-wire transformer free UPS system with which different rectifier and bypass power sources are used is eliminated by using different types of PWM control depending on whether the inverter is paralleled with the bypass power source. When the inverter is paralleled with the bypass power source, a type of PWM control is used that does not have common mode voltage injection. When the inverter is not paralleled with the bypass power source, a type of PWM control is used that has common mode voltage injection. In an aspect, the PWM control that does not have common mode voltage injection is sine-triangle PWM and the PWM control that has common mode voltage injection is space-vector PWM.

公开(公告)号：US10404094B2

公开(公告)日：2019-09-03

申请号：US15151167

申请日：2016-05-10

申请人： Liebert Corporation

发明人： Terry D. Bush ,  Charles F. Blair ,  Gregg J. Nelson

IPC分类号： H02J9/06 ,  H02J3/38

摘要： The present disclosure relates to a load sharing system having a plurality of power supplies for powering a plurality of corresponding loads. Each one of the power supplies is associated with at least one of the loads. A power bus is also provided. A plurality of inductors is connected to the power bus. Each one of the inductors is further connected to at least one of the loads and to at least one of the power supplies, such that each adjacent pair of the inductors is connected in parallel relative to at least one of the loads. Each of the inductors has an inductance value sufficient so that if a fault develops on the power bus it serves to isolate the power supplies from the power bus. The inductance value further is such that if any one of the power supplies fails, the specific pair of inductors coupled in parallel to the load associated with the failed power supply allows the load to draw power over the power bus from other ones of the power supplies through the specific pair of inductors.

公开(公告)号：US09531288B2

公开(公告)日：2016-12-27

申请号：US14078884

申请日：2013-11-13

申请人： Liebert Corporation

发明人： Terry D. Bush ,  Brian P. Heber ,  Russell E. Shetler, Jr.

IPC分类号： H02M5/40 ,  H02J3/24

CPC分类号： H02M5/40 ,  H02J3/24 ,  H02J9/062 ,  Y10T307/406

摘要： A UPS includes an input that receives first power from a utility source to power a load and receives second power from the utility source. The load is separate from the UPS. An inverter receives when in a first mode, the first and second power and when in a second mode, the second power and not the first power. The second power is used to power the inverter. A bypass circuit is connected to the input and bypasses the inverter to supply the first power to an output of the UPS when operating in the second mode. A control module detects a voltage at the output of the UPS, integrates the voltage to generate a first sum, and subsequent to completing a transition between the first and second modes, adjusts an output voltage of the inverter based on the first sum to balance the voltage of the UPS.

摘要翻译： UPS包括一个输入端，该输入端接收来自公用电源的第一电力来为负载提供电力并从该电力源接收第二电力。 负载与UPS分开。 逆变器在第一模式下接收第一和第二功率，并且当处于第二模式时，第二功率而不是第一功率。 第二个电源用于为变频器供电。 旁路电路连接到输入端，并且旁路逆变器以在第二模式下工作时向UPS的输出端提供第一电力。 控制模块检测UPS的输出端的电压，积分电压以产生第一和，并且在完成第一和第二模式之间的转换之后，根据第一和调整逆变器的输出电压，以平衡 UPS的电压。

公开(公告)号：US20140132074A1

公开(公告)日：2014-05-15

申请号：US14055311

申请日：2013-10-16

申请人： Liebert Corporation

发明人： Terry D. Bush ,  Brian P. Heber ,  Russell E. Shetler, JR. ,  Peter A. Panfil

IPC分类号： H02J9/06

CPC分类号： H02J9/06 ,  H02J9/00 ,  Y10T307/615 ,  Y10T307/625 ,  Y10T307/747

摘要： When the preferred voltage source for a static transfer switch is a UPS, there can be a brief interruption in the voltage received from the UPS while the UPS is switching from economy mode to normal mode. Operation of the static transfer switch can be improved during such voltage disturbances. Specifically, the static transfer switch may be in data communication with the UPS and thereby made aware that the voltage disturbance is temporary. As a result, the static transfer switch can avoid an unnecessary transfer to an alternate voltage source.

摘要翻译： 当静态转换开关的优选电压源为UPS时，当UPS从经济模式切换到正常模式时，可以从UPS接收到的电压短暂中断。 在这种电压扰动期间，静电转换开关的操作可以得到改善。 具体地说，静电转换开关可以与UPS的数据通信，从而使电压扰动是暂时的。 因此，静态转换开关可以避免不必要地转移到交替电压源。

公开(公告)号：US10439431B2

公开(公告)日：2019-10-08

申请号：US15412476

申请日：2017-01-23

申请人： Liebert Corporation

发明人： Charles F. Blair ,  Terry D. Bush ,  Xian Chen

IPC分类号： H02J9/06 ,  H02M1/32 ,  H02M1/36 ,  H02H7/125 ,  H02H9/00 ,  H02M5/458

摘要： A method reduces inrush currents in a transformer-less rectifier UPS system when an input circuit breaker of the UPS system is closed from an open position. The circuit breaker is coupled between an AC power input and an AC input of a rectifier of the UPS system and a DC output of the rectifier is coupled to a DC bus of the UPS system. Before the circuit breaker is closed, the DC bus is charged to a DC voltage having a level that is equal to a peak AC voltage level of a line-line AC voltage of AC input power to the UPS system. The rectifier is operated as an inverter to provide an AC output voltage at the AC input of the rectifier that is equal to an AC voltage at the AC power input and when it is equal, the circuit breaker is closed.

公开(公告)号：US09915687B2

公开(公告)日：2018-03-13

申请号：US15075535

申请日：2016-03-21

申请人： Liebert Corporation

发明人： James K. Martin ,  Terry D. Bush ,  Charles F. Blair

IPC分类号： G01R19/06 ,  G01R19/02 ,  G01R31/02

CPC分类号： G01R19/06 ,  G01R19/02 ,  G01R31/025

摘要： A real current meter reads current from a current probe coupled around power lines of a transformer-based UPS system coupled to a transformer having a high resistance ground with a HRG resistance and determines a real current component of the current read from the current probe.

公开(公告)号：US20140132080A1

公开(公告)日：2014-05-15

申请号：US14056258

申请日：2013-10-17

申请人： Liebert Corporation

发明人： Terry D. Bush ,  James M. Miller

IPC分类号： H03K17/94

CPC分类号： H03K17/94 ,  H02J9/06 ,  Y10T307/747 ,  Y10T307/858

摘要： A method is provided for operating a static transfer switch to eliminate transformer inrush current in the presence of residual flux. The method includes: detecting an interrupt of electric power at an output terminal of the static transfer switch; controlling amplitude of voltage at the output terminal using phase fired control of one or more silicon controlled rectifiers interposed between a voltage source and the output terminal, where the amplitude of voltage is set at a value less than a peak value of the sinusoidal waveform; and increasing the amplitude of voltage at the output terminal incrementally until the amplitude reaches a peak value.

摘要翻译： 提供了一种用于操作静态转移开关以在存在残余通量的情况下消除变压器涌入电流的方法。 该方法包括：检测静态转换开关的输出端的电力中断; 使用插入在电压源与输出端子之间的一个或多个可控硅整流器的相位控制来控制输出端子处的电压幅度，其中电压幅度被设定为小于正弦波形的峰值的值; 并且增加输出端子处的电压幅度，直到振幅达到峰值。

公开(公告)号：US10277066B2

公开(公告)日：2019-04-30

申请号：US15060964

申请日：2016-03-04

申请人： Liebert Corporation

发明人： Terry D. Bush ,  Brian P. Heber

IPC分类号： H02J3/46 ,  H02J9/06 ,  H02M7/493

摘要： A method is provided for balancing power amongst parallel connected power converters in an uninterruptible power supply (UPS). The method includes: applying a control signal to each of the parallel connected power converters, where the control signals applied to the parallel connected power converters are derived from a common control signal output by a centralized controller; receiving measurements of current being supplied by each power converter to the load; and adjusting phase of voltage applied to at least one of the power converters based on the received current measurements, such that the phase adjustment causes same magnitude of current to flow though each filter. Advancing phase angle of the voltage increases current supplied by the at least one power converter while retarding phase angle of the voltage decreases current supplied by the at least one power converter.

公开(公告)号：US09876390B2

公开(公告)日：2018-01-23

申请号：US14055311

申请日：2013-10-16

申请人： Liebert Corporation

发明人： Terry D. Bush ,  Brian P. Heber ,  Russell E. Shetler, Jr. ,  Peter A. Panfil

IPC分类号： H02J9/06 ,  H02J9/00

CPC分类号： H02J9/06 ,  H02J9/00 ,  Y10T307/615 ,  Y10T307/625 ,  Y10T307/747

摘要： When the preferred voltage source for a static transfer switch is a UPS, there can be a brief interruption in the voltage received from the UPS while the UPS is switching from economy mode to normal mode. Operation of the static transfer switch can be improved during such voltage disturbances. Specifically, the static transfer switch may be in data communication with the UPS and thereby made aware that the voltage disturbance is temporary. As a result, the static transfer switch can avoid an unnecessary transfer to an alternate voltage source.

公开(公告)号：US09520874B2

公开(公告)日：2016-12-13

申请号：US14056258

申请日：2013-10-17

申请人： Liebert Corporation

发明人： Terry D. Bush ,  James M. Miller

IPC分类号： H01H47/00 ,  H03K17/94 ,  H02J9/06

CPC分类号： H03K17/94 ,  H02J9/06 ,  Y10T307/747 ,  Y10T307/858

摘要： A method is provided for operating a static transfer switch to eliminate transformer inrush current in the presence of residual flux. The method includes: detecting an interrupt of electric power at an output terminal of the static transfer switch; controlling amplitude of voltage at the output terminal using phase fired control of one or more silicon controlled rectifiers interposed between a voltage source and the output terminal, where the amplitude of voltage is set at a value less than a peak value of the sinusoidal waveform; and increasing the amplitude of voltage at the output terminal incrementally until the amplitude reaches a peak value.

摘要翻译： 提供了一种用于操作静态转移开关以在存在残余通量的情况下消除变压器涌入电流的方法。 该方法包括：检测静态转换开关的输出端的电力中断; 使用插入在电压源与输出端子之间的一个或多个可控硅整流器的相位控制来控制输出端子处的电压幅度，其中电压幅度被设定为小于正弦波形的峰值的值; 并且增加输出端子处的电压幅度，直到振幅达到峰值。