公开(公告)号：US5386147A

公开(公告)日：1995-01-31

申请号：US184774

申请日：1994-01-21

申请人： Victor B. Bonneau ,  Gary M. Kuzkin ,  Robert G. Wagoner ,  John A. Overman

发明人： Victor B. Bonneau ,  Gary M. Kuzkin ,  Robert G. Wagoner ,  John A. Overman

IPC分类号： H01H9/54 ,  H01H9/56 ,  H02J3/38 ,  H02J9/06 ,  H02J3/06

CPC分类号： H02J3/38 ,  H02J9/061 ,  H01H9/548 ,  H01H9/563 ,  H02J2009/068 ,  Y10T307/615 ,  Y10T307/735

摘要： An aerospace power control system switches an aerospace load from a faulty ac power bus to a good ac power bus of two or more ac power buses if the currently connected ac power bus is about to fail. The voltage level and frequency of the power provided on the buses are monitored to determine which of the power buses are within required limits to provide power to the aerospace load. If monitoring of the currently connected ac power bus indicates that the bus is not within the required limits and may be shut down in the immediate future, the connection of the aerospace load is switched to another ac power bus which is within the required limits. The current provided to the load is monitored to determine zero-crossing points of the current with the switch from the currently connected faulty bus to a good bus being performed at a zero-crossing point of the load current. The level of the current being provided to the aerospace load is also monitored to detect a faulty load condition. If the load current exceeds defined limits, the load will be disconnected from all ac power buses to shut down the faulty load. The aerospace power control system is generally applicable to single phase and three phase ac power, with switch over at zero-crossing points being performed on a phase-by-phase basis for three phase ac power.

摘要翻译： 如果当前连接的交流电源总线即将发生故障，航空航天电源控制系统将航空负载从故障交流电源总线切换到两个或多个交流电源总线的良好交流电源总线。 对总线上提供的电源的电压电平和频率进行监控，以确定哪些电力总线处于所需的限制范围内以向航空航天负载提供电力。 如果当前连接的交流电源总线的监控指示总线不在要求的限制范围内，并且可能在不久的将来关闭，则航空航天负载的连接将切换到所需限制内的另一个交流电源总线。 监测提供给负载的电流，以确定电流与当前连接的故障总线之间的电流的过零点到在负载电流的零交叉点执行的良好总线。 还监测提供给航空航天负载的电流的电平以检测故障负载状况。 如果负载电流超过规定限值，则负载将与所有交流电源总线断开，以关闭故障负载。 航空航天电力控制系统通常适用于单相和三相交流电源，在过零点切换为三相交流电源逐相进行。

公开(公告)号：US4742208A

公开(公告)日：1988-05-03

申请号：US918014

申请日：1986-10-14

申请人： John A. Overman

发明人： John A. Overman

IPC分类号： B23K9/073 ,  H02M7/5387 ,  B23K9/10

CPC分类号： B23K9/073 ,  H02M7/53871

摘要： A welding system with an electronic control includes four switching elements coupled together to form a bridge. An inductor with a center tap is located between two legs of the bridge. A load, including an output electrode and the metal parts being welded, is coupled between the center tap of the inductor and the other two branches of the bridge. Two of the switching elements are turned on and off at a relatively high rate to control the power to the load. The other two are turned on and off at a relatively low rate to control the duty cycle and polarity of the load voltage and current.

摘要翻译： 具有电子控制的焊接系统包括耦合在一起以形成桥的四个开关元件。 具有中心抽头的电感器位于桥的两条腿之间。 包括输出电极和被焊接的金属部件的负载耦合在电感器的中心抽头和桥的另外两个分支之间。 两个开关元件以相对较高的速率接通和断开以控制负载的功率。 另外两个以相对低的速率开启和关闭，以控制负载电压和电流的占空比和极性。

公开(公告)号：US4459459A

公开(公告)日：1984-07-10

申请号：US300352

申请日：1981-09-08

申请人： John A. Overman

发明人： John A. Overman

IPC分类号： B23K9/073 ,  B23K9/09

CPC分类号： B23K9/0732

摘要： A power supply for electric arc welding, particularly gas tungsten arc welding, is described. The supply operates from conventional, alternating potential, and provides either a direct current or an alternating current with a rectangular wave shape to a load. The supply includes an input transformer, and two current paths, each of which includes an inductor and a controlled rectifier. A control circuit initiates conduction of the rectifiers at appropriate times selected to obtain the desired load current. In preferred embodiments, the control circuit includes differential amplifiers which enable comparison of the output current to a control current, adjustment of the ratio of the currents in the two current paths, and adjustment of the gain and time constant of the control circuit.

摘要翻译： 描述了用于电弧焊的电源，特别是气体钨弧焊。 该电源由常规的交替电位操作，并且向负载提供具有矩形波形的直流或交流电。 电源包括输入变压器和两个电流路径，每个电流路径包括电感器和受控整流器。 控制电路在选择的适当时间启动整流器的导通以获得所需的负载电流。 在优选实施例中，控制电路包括能够将输出电流与控制电流进行比较的差分放大器，两个电流路径中的电流比的调整以及控制电路的增益和时间常数的调整。