DE2019618C2 - Electrical controller consisting of a feedback control amplifier - Google Patents

Description

To be able to achieve magnitude, amplifiers must be used can be used with field effect input.

According to FIG. 2, the output signal arrives at the input of the impedance converter via the resistor-capacitor network R _v -C _v - C _1. Its input resistance is determined by changing the potentiometer P, which determines the reset time, and its feedback resistance. In addition, since the potentiometers used to set the values of interest are arranged after the impedance conversion, their values can be kept small.

Function potentiometers or low-resistance integrated switches can also be used for special applications. The resistance R _p lying parallel to P for setting the ΑΓ ,, range becomes

now no longer limited by the smallest value of the reset time T _n , as is the case with a known design, but can now be selected independently of this and be of low resistance. A low resistance in

ίο integrated circuit for discrete values and good Reproducibility can be chosen.

1 sheet of drawings

Claims (2)

1 2 ler to be able to use a low-resistance patent claims here too: · Resistance. When separating the capacitor from the associated resistor 1.Electric controller, consisting of one but the high-pass effect would be lost,
negative feedback control amplifier, in its 5 It is the task of the invention to design the feedback so the feedback channel a jRC element to generate the that consistently mederohmige cons-integral behavior and a potentiometer to stand (or potentiometer) as setting resistors setting the P- Area as well as an impedance converter used for the P area and the reset time are provided and in which the Po- can throw. Tentiometer for setting the P-range between io This task is solved according to the invention in a controller of the type initially seen, the output of the impedance converter and the type mentioned, in that the input resistance of the control amplifier is assigned a fully negative feedback as the impedance converter, characterized by ration amplifier is provided, on whose plus-one as an impedance converter a fully negative feedback gear of the capacitor for generating the integral operational amplifier (V.) is provided, at 15 behavior, at the output of which apart from the potentiometer plus input of the capacitor (C,) for meter for setting the P range em Potentio generation of the integral behavior, to whose meter with tap for setting the reset time output is connected in addition to the potentiometer (R,) for setting, and that between tapping the setting of the P range a potentiometer (P) with potentiometer for setting the reset time and tap for setting the Reset time (T _n ) on- »ο the plus input of the operational amplifier is closed, and that a feedback resistor is connected between the tap
of the potentiometer (P) to adjust the adjustment time and the plus input of the operational low-resistance or potentiometer amplifier a feedback resistor (R) switched to adjust the adjustment time and the proportional range. Instead of several high-resistance 2. Electrical regulator according to claim 1, that resistors can now advantageously a through the input characterized in that the potentiometer (P) resistance of the impedance converter determining low-resistance potentiometers can be used to set the integral time to ground. the is closed. for impedance conversion serving amplifier is on 30 wired in this way with a resistor network, so that he as an adjustable high resistance Resistance works. This makes it possible to continuously adjust the parameters of the controller. The invention relates to an electrical device. The invention also provides the advantage Controller, consisting of a gen-coupled control system, ensures that the control amplifier also has a low resistance amplifier, in whose return channel an ÄC element can be implemented, thereby improving the to generate the integral entanglement and a Po-drift behavior and a significant price reduction tentiometer for setting the P-range as well as a can be achieved. Impedance converters are provided and in which the 40 The invention is to be explained with reference to the drawing Potentiometer for setting the P range between. It shows see the output of the impedance converter and the Fig. 1 a known control circuit with impedance input resistance of the control amplifier arranged danzwanderung in the feedback,
is. F i g. 2 is a circuit diagram of an exemplary embodiment The problem with previous regulators was that the 45 of the invention. The resistance R _{1 of} the integration time constant controller parameter ("which must be very high-resistance - j _». Q ten. This required a high-resistance input ' input resistance of the control amplifier. One therefore becomes duri>'.'er. Input resistance of the amplifier in a known regulator shown in FIG. 1 is a 50 V ₉ de »: .ch, ₃ 't, mg according to FIG.
so that the input resistance of the control amplifier can be carried out with low resistance. When changing _ However, that of the proportional band results in a 1 ~~ Jump in the course of the controller output variable. 55 ^ _t In the case of the regulator mentioned at the beginning, which is in the
Siemens-Z. 41 (1967), No. 6, p. 492, Fig. 5, shown _α _ _2L is therefore the potentiometer for setting the ρ P-range arranged behind the impedance converter. This avoids the jump in the course of the controller 60 ( _a = resistance ratio of resistance R ₁ between output variable when the P range changes, tap and ground to total resistance of the. However, potentiometers are now in the feedback). mixed low-resistance and high-resistance setting It follows that theoretically the range resistances for the P range and the reset time R <"R <00 arranged. This is particularly unfavorable if 65 - ^l - the integrated circuit can be painted over. In practice, however, will shall be. One could now simply change the resistance of the upper limit value through the quiescent current of the verdes jRC element also given behind the impedance wall amplifier, d. H. to values of those of interest