公开(公告)号：US5552977A

公开(公告)日：1996-09-03

申请号：US493221

申请日：1995-06-20

Applicant: Xingyi Xu ,  Doug Deng

Inventor： Xingyi Xu ,  Doug Deng

IPC: H02M7/5387 ,  H02M7/162

CPC classification number: H02M7/53875

Abstract: When negative times are calculated for zero space vectors of a SVPWM controlled three phase inverter circuit, the zero vector times are set to zero, the non-zero space vector closer to a commanded space vector is preserved, and the non-zero space vector farther from the commanded space vector is truncated. Thus, control of the inverter circuit seamlessly transits from SVPWM to full six step operation. In one arrangement, for each negative calculated zero space vector time, the larger of the non-zero space vector times is set to the minimum of its calculated time and the pulse width modulation control period (TPWM), and the smaller of the calculated non-zero space vector times is set equal to TPWM less the set value of the larger of the non-zero space vector times. In another arrangement, each negative calculated zero space vector time is algebraically combined with the smaller of the non-zero space vector times. If the resulting non-zero space vector time is greater than or equal to zero, it is used together with the calculated time for the larger of the non-zero space vectors. If the resulting non-zero space vector time is less than zero, the time for the larger of the non-zero space vectors is set to TPWM and the time for the smaller of the non-zero space vectors is set to zero. For both of these arrangements, the zero space vector time is set to zero.

Abstract translation: 对于SVPWM控制的三相逆变器电路的零空间矢量计算负时间时，零矢量时间被设置为零，保持更靠近命令空间矢量的非零空间矢量，并且非零空间矢量更远 从命令空间向量被截断。 因此，逆变器电路的控制无缝地从SVPWM转移到全六步操作。 在一个布置中，对于每个负的计算的零空间矢量时间，将非零空间矢量时间中的较大的空间矢量时间设置为其计算时间的最小值和脉宽调制控制周期（TPWM），并且计算的非零空间矢量时间 - 零空间矢量时间被设置为等于TPWM小于非零空间矢量次数较大的设定值。 在另一种布置中，每个负的计算的零空间矢量时间与非零空间矢量时间中的较小的一个代数组合。 如果所得到的非零空间矢量时间大于或等于零，则与所计算的较大的非零空间矢量的时间一起使用。 如果所得到的非零空间矢量时间小于零，则较大的非零空间矢量的时间被设置为TPWM，并且较小的非零空间矢量的时间被设置为零。 对于这两种布置，零空间矢量时间被设置为零。

公开(公告)号：US5469351A

公开(公告)日：1995-11-21

申请号：US270967

申请日：1994-07-05

Applicant: Md A. Masrur ,  Xingyi Xu ,  Feng Liang

Inventor： Md A. Masrur ,  Xingyi Xu ,  Feng Liang

IPC: H02H7/085 ,  H02H7/122 ,  H02M5/458 ,  H02H7/12

CPC classification number: H02H7/0858 ,  H02H7/1227

Abstract: A fault isolation system for a three-phase induction motor drive system includes an inverter to convert direct-current power from a battery into alternating current for the three phases of the motor. The inverter contains six semiconductor switches, two for each phase of the motor, as is conventional in the art of induction motor control. Further, the inverter contains two additional semiconductor switches. These switches form an output connected, via a dummy load in parallel with a third additional semiconductor switch, to the neutral connection of the motor. In the event that any of the six conventional switches in the inverter become short-circuited, the four switches in the other two phases of the inverter as well as the two additional switches are actuated to generate current sufficient to blow a fuse connected in series with the output of the inverter coupled to the short-circuited switch. The motor is thus isolated from the short-circuited switch, preventing the short-circuited switch from totally disabling the motor. An alternative motor drive strategy, such as a two-phase drive strategy, can then be employed.

Abstract translation: 用于三相感应电动机驱动系统的故障隔离系统包括将来自电池的直流电力转换为电动机三相的交流电的逆变器。 逆变器包含六个半导体开关，两个用于电动机的每相，如感应电动机控制领域中常规的。 此外，逆变器包含两个附加的半导体开关。 这些开关形成通过与第三附加半导体开关并联的虚拟负载连接到电机的中性连接的输出。 在逆变器中的六个常规开关中的任何一个变得短路的情况下，逆变器的另外两个相中的四个开关以及两个附加开关被致动以产生足以吹过与 逆变器的输出耦合到短路开关。 电动机因此与短路开关隔离，防止短路开关完全禁用电机。 然后可以采用替代的电动机驱动策略，例如两相驱动策略。