| 摘要 |
1535560 Automatic control systems SIEMENS AG 13 Feb 1976 [12 March 1975] 05837/76 Heading G3R [Also in Division G4] Automatic control circuitry for apparatus S having a finite response time has two parallel paths for the desired value signal W, one path having a delay circuit N and an integral action controller R and the other path by-passing these elements. The time constant of the circuit N is made equal to the response time TO of the apparatus; thus, when W is changed the resulting disturbance in a feedback signal x, which would be integrated at R and cause instability, is cancelled by the output of N at the appropriate instant. P is an amplifier whose gain matches that of the apparatus and K is a non-linear circuit whose characteristic is the inverse of that of the apparatus S, so as to make the overall response linear. M is an optimal "modulator" to compensate the gain of the control loop with that of circuit K. A particular embodiment is described Fig. 2 (not shown) in which the apparatus comprises a thyristor converter which energizes a D.C. motor from an A.C. supply, the motor current being retroactively controlled by firing angle adjustment of the thyristors.. In this embodiment an additional control signal is provided, obtained from the difference between the input and output of the delay circuit N, applied via an amplifier whose gain is set in accordance with the tune constant of the armature circuit. The "modulator" includes operational amplifier circuits for obtaining the cube root of the desired current Fig. 4 (not shown). In an alternative to Fig. 1 the "modulator" is omitted and both the feedback signal and the output of N are applied via non-linear circuits corresponding to K Fig. 5 (not shown). |
