公开(公告)号：US4247752A

公开(公告)日：1981-01-27

申请号：US946223

申请日：1978-09-26

申请人： Loren F. Stringer

发明人： Loren F. Stringer

IPC分类号： B23K9/073 ,  B23K9/06 ,  B23K9/10

CPC分类号： B23K9/1056 ,  B23K9/0732

摘要： A constant current arc welder of the type in which arc current is regulated by thyristor phase angle adjustment, includes voltage feedback voltage control and current feedback current control, with automatic transfer from the voltage control mode into the current control mode when current has been established in the arc. A time delay allows smooth transfer to the desired current operative level by limiting the current inrush under an initial current reference and with a chosen feedback control dynamic characteristic current boost is also automatically provided when the arc voltage falls below a predetermined level.

摘要翻译： 电弧电流由晶闸管相位角调整调节的恒流电弧焊机，包括电压反馈电压控制和电流反馈电流控制，电流控制模式自动转换到电流控制模式 电弧。 时间延迟允许通过在初始电流基准下限制电流涌入而平滑地转移到期望的当前操作电平，并且通过所选择的反馈控制，当电弧电压下降到预定电平以下时，也自动提供动态特性电流提升。

公开(公告)号：US4427933A

公开(公告)日：1984-01-24

申请号：US315600

申请日：1981-10-30

申请人： Paul W. Wagener ,  Loren F. Stringer

发明人： Paul W. Wagener ,  Loren F. Stringer

IPC分类号： H02M1/08 ,  H02M7/529 ,  H02P23/00 ,  H02P25/02 ,  H02P5/40

CPC分类号： H02P23/0077 ,  H02M7/529 ,  H02P25/024

摘要： A synchronous motor drive includes an inverter gating control system using three counters wherein two counters respond to 180.degree. apart zero crossings for providing units of time in terms of clock units, and the third counter is at a computed time interval preset with a count to be counted down to derive the remaining time which is to elapse until a predetermined firing angle is reached, at which time firing of the thyristor of the inverter is triggered.

摘要翻译： 同步电动机驱动器包括使用三个计数器的逆变器门控控制系统，其中两个计数器响应于180度分开的过零点，以提供时钟单位的时间单位，并且第三计数器处于计算的时间间隔，其中计数为 向下计数以得出待到达预定触发角的剩余时间，此时触发逆变器的晶闸管。