公开(公告)号：US4876468A

公开(公告)日：1989-10-24

申请号：US919914

申请日：1986-10-16

申请人： James T. Libert

发明人： James T. Libert

IPC分类号： H03K17/06 ,  H03K17/082 ,  H03K17/13 ,  H03K17/725

CPC分类号： H03K17/06 ,  H03K17/0824 ,  H03K17/136 ,  H03K17/725

摘要： A gate drive circuit for a thyristor has a power supply and an amplifier for supplying current to a gate electrode of the thyristor. A timing signal is generated to initiate conduction of the thyristor. A voltage level signal is generated in response to a voltage from cathode to anode of the thyristor to indicate a reduction in the cathode to anode voltage of the thyristor when the voltage is reduced by conduction of the thyristor. Current is supplied to the gate electrode of the thyristor in response to the timing signal, and current ceases to flow to the gate electrode of the thyristor at a predetermined time interval following generation of the voltage level signal indicative of a collapse in cathode to anode voltage of the thyristor caused by conduction of the thyristor, and the predetermined time interval is chosen to be of sufficient duration to permit conduction of the thyristor to reach a stable value before current flow to the gate electrode of the thyristor substantially ceases.

摘要翻译： 用于晶闸管的栅极驱动电路具有电源和用于向晶闸管的栅电极提供电流的放大器。 产生定时信号以启动晶闸管的导通。 响应于晶闸管的阴极至阳极的电压而产生电压电平信号，以指示当晶闸管导通时电压降低时晶闸管的阴极与阳极电压的降低。 响应于定时信号，电流被提供给晶闸管的栅电极，并且在产生指示阴极至阳极电压崩溃的电压电平信号之后，电流在预定的时间间隔停止流入晶闸管的栅电极 的晶闸管导通，并且预定时间间隔被选择为具有足够的持续时间，以在电流流过晶闸管的栅电极基本上停止之前允许晶闸管导通以达到稳定值。

公开(公告)号：US4710692A

公开(公告)日：1987-12-01

申请号：US919915

申请日：1986-10-16

申请人： James T. Libert ,  Earl J. Curran, Jr.

发明人： James T. Libert ,  Earl J. Curran, Jr.

IPC分类号： H02P23/00 ,  H02P5/40

CPC分类号： H02P23/26

摘要： A reference current lag for a motor controller is selected so that the reference current lag approximates the motor current lag when the motor is fully loaded. A motor controller has a plurality of thyristors for controlling electric current flow to the motor. A firing circuit fires the thyristors at a selected firing angle. A current lag, as a phase angle between a power line voltage applied to the motor and electric current flow to the motor, is measured. The selected firing angle is adjusted so that the measured current lag is substantially equal to a reference current lag. A temporary value of the reference current lag is selected. The motor current is monitored, and in the event that the motor current becomes between an upper predetermined motor current and a lower predetermined motor current, the reference current lag is given a final value. The final value may be equal to the current lag measured when the motor current is between the upper predetermined motor current and the lower predetermined motor current. The temporary value of the reference current lag may be taken as the measured current lag during a predetermined line cycle after initiation of current flow to the motor. The predetermined line cycle may be the third line cycle after initiation of current flow to the motor. The temporary value of the reference current lag may be a minimum value of current lag measured as the motor starts from a stopped condition to a full speed condition. The upper predetermined motor current may be 100% of a motor full load current, and the lower predetermined motor current may be 85% of a motor full load current, thereby defining a motor current window.

摘要翻译： 选择电动机控制器的参考电流滞后，使得参考电流滞后近似于电动机完全负载时的电动机电流滞后。 电动机控制器具有用于控制电流流向电动机的多个晶闸管。 点火电路以选定的触发角度触发晶闸管。 作为施加到电动机的电力线电压与电动机的电流之间的相位角的电流滞后，被测量。 调整所选择的触发角，使得测量的电流滞后基本上等于参考电流滞后。 选择参考电流滞后的临时值。 监测电动机电流，并且在电动机电流变为上限预定电动机电流和较低预定电动机电流之间的情况下，给定参考电流滞后值。 最终值可以等于当电动机电流在上限预定电动机电流和较低预定电动机电流之间时测量的当前滞后。 可以将参考电流滞后的临时值作为在电流流向电动机之后的预定行周期期间的测量电流滞后。 预定的线周期可以是在电流流向电动机之后的第三行周期。 参考电流滞后的临时值可以是当电动机从停止状态开始到全速状态时测量的当前滞后的最小值。 上限的电动机电流可以是电动机满载电流的100％，并且较低的预定电动机电流可以是电动机满载电流的85％，从而限定电动机电流窗口。