公开(公告)号：US4494181A

公开(公告)日：1985-01-15

申请号：US449757

申请日：1982-12-14

申请人： Franz Ramlohr ,  Werner Pohl ,  Walter Kolzer

发明人： Franz Ramlohr ,  Werner Pohl ,  Walter Kolzer

IPC分类号： H02P7/03 ,  H02M7/02

CPC分类号： H02P7/04

摘要： A circuit arrangement for determining the polarity and the magnitude of the load current in a reversible d-c controller includes a bridge circuit comprising two pairs of bridge arms connected to opposite terminals of the voltage supply bus. Each pair of bridge arms connected to the same side of the supply bus form a bypass circuit connected across the load. Two diagonally disposed bridge arms each contain a primary winding of a current transformer having two primary windings connected in opposite winding phase. Load current normally flows through either pair of diagonally disposed bridge arms, but during pauses in the load drive, circulates in one of the two bypass circuits. Electronic switches in each of the bridge arms are controlled so that the load current circulates in successive bypass periods in an alternating pattern in the two bypass circuits. When current flows in a bypass circuit, a phase sensitive voltage is induced in the single secondary of the current transformer. Signals from the electronic switches in one of the bypass circuits are fed via digital logic circuitry to a further electronic switch which causes an operational amplifier to invert pulses from that bypass circuit alone. A pulse train having a polarity corresponding to the polarity of the load current is thereby obtained. In a further embodiment, a sample-and-hold stage for determining the magnitude and polarity of the load current is provided.

摘要翻译： 用于确定可逆d-c控制器中的负载电流的极性和幅度的电路装置包括桥接电路，其包括连接到电压供应总线的相对端子的两对桥臂。 连接到电源总线同一侧的每对桥臂形成一个连接在负载上的旁路电路。 两个对角布置的桥臂各自包含电流互感器的初级绕组，其具有以相反绕组相连接的两个初级绕组。 负载电流通常流过任一对对角布置的桥臂，但是在负载驱动中的暂停期间，在两个旁路电路之一中循环。 控制每个桥臂中的电子开关，使得负载电流在两个旁路电路中以交替模式在连续的旁路周期中循环。 当电流在旁路电路中流动时，在电流互感器的单次级中感应出相敏电压。 来自旁路电路之一的电子开关的信号通过数字逻辑电路馈送到另一个电子开关，使得运算放大器单独地反转来自旁路电路的脉冲。 由此获得具有与负载电流的极性对应的极性的脉冲串。 在另一实施例中，提供了用于确定负载电流的大小和极性的采样和保持级。

公开(公告)号：US4540926A

公开(公告)日：1985-09-10

申请号：US449834

申请日：1982-12-14

申请人： Walter Kolzer ,  Wilhelm Reischer

发明人： Walter Kolzer ,  Wilhelm Reischer

IPC分类号： G05B6/02 ,  G05B11/36

CPC分类号： G05B6/02

摘要： In a circuit arrangement for an alternating control a PI controller comprises a first operational amplifier having an output connected via a resistor to the non-inverting input of a second operational amplifier wired as an impedance transformer. The output of the second operational amplifier is fed back via an RC stage to the inverting input of the first operational amplifier. The output of a second controller is connected via a decoupling diode to a junction between the decoupling resistor and the non-inverting input of the second operational amplifier. Positive as well as negative signals can occur at the output of the first operational amplifier, and discontinuities in control during a switch over between the two controllers are avoided.

摘要翻译： 在用于交替控制的电路装置中，PI控制器包括第一运算放大器，其具有经由电阻器连接到作为阻抗变换器布线的第二运算放大器的非反相输入的输出。 第二运算放大器的输出经由RC级反馈到第一运算放大器的反相输入端。 第二控制器的输出经由去耦二极管连接到去耦电阻和第二运算放大器的非反相输入端之间的结。 可以在第一运算放大器的输出处产生正的和负的信号，并避免在两个控制器之间切换期间的控制中的不连续性。