公开(公告)号：US4810873A

公开(公告)日：1989-03-07

申请号：US113864

申请日：1987-10-29

Applicant: Urs Ammann ,  Thomas Dobler ,  Martin Maschek ,  Georg Mastner

Inventor： Urs Ammann ,  Thomas Dobler ,  Martin Maschek ,  Georg Mastner

IPC: H04B10/25 ,  H01J5/16 ,  H01J40/14

CPC classification number: H04B10/25

Abstract: Measurement value signals (S1), for example from a signal transmitter which is located at high-voltage potential, which are transmitted by a signal transmitter (1) with a transmit diode (6) on the high voltage side via an optical waveguide (8) to a signal receiver (9) with a photodiode (10) at ground potential, are subject to an optical signal attenuation along the way. To ensure automatic attenuation compensation both for alternating and for direct voltage measurement signals (S1), a reference direct current (I.sub.REF) is fed back to the transmit diode (6). The transmission system is calibrated before each measurement. During this process, the input of an amplifier (4) of the signal transmitter (1) is connected to reference potential (U0) via a switch (3) and the gain factor of the signal receiver (9) is controlled in such a manner that its output signal (S9) is equal to a predeterminable reference voltage (U.sub.REF). The output signal (S14) of a differential amplifier (14) is supplied via a lowpass filter (16) and a 1st post amplifier (17) to an instantaneous-value memory (18), the output signal (S18) of which controls the gain factor. After the calibrated state has been reached, the closed-loop control circuit is interrupted so that the gain factor remains constant until a new calibration is performed. The gain factor can be adjusted via electrically, electromechanically or optically controllable resistances or a multiplier or via the bias voltage of an avalanche photodiode (10).

Abstract translation: 测量值信号（S1），例如来自位于高电位电位的信号发射器，由具有发射二极管（6）的信号发射器（1）通过光波导（8）在高压侧传输 ）到具有接地电位的光电二极管（10）的信号接收器（9）沿着路径受到光信号衰减。 为了确保交流和直流电压测量信号（S1）的自动衰减补偿，参考直流（IREF）被反馈到发射二极管（6）。 传输系统在每次测量之前进行校准。 在该过程中，信号发送器（1）的放大器（4）的输入经由开关（3）连接到参考电位（U0），并且以这种方式控制信号接收器（9）的增益因子 其输出信号（S9）等于可预定的参考电压（UREF）。 差分放大器（14）的输出信号（S14）经由低通滤波器（16）和第一后置放大器（17）提供给瞬时值存储器（18），其输出信号（S18）控制 增益因子。 在达到校准状态之后，闭环控制电路被中断，使得增益因子保持恒定，直到执行新的校准。 增益因子可以通过电气，机电或光学可控电阻或乘法器或通过雪崩光电二极管（10）的偏置电压进行调整。