DE1806958A1 - Setpoint / actual value comparator - Google Patents

Description

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Attachment to
Patent application

R O 3 5 R ι 'BOSCH GMBH, St at t ^ ar r W, Breit schei.'ls' ^ raße -Ί Setpoint - actual value - comparator

The invention relates to a circuit arrangement for Comparison of a setpoint value with an actual value in which the pure circuit uses two complementary transistors will.

It has been found to be advantageous to control loops, regulators, comparators, actuators and transducers according to the Build up the modular principle.

The route to be regulated is in this way with inexpensive and control gyro elements that have been carefully checked for their reliability supervised. When building these building elements,

008820/068 $

OAiGiHAL INSPECTED

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Robert Bosch. GmbH
Stuttgart

it / 9262 01 / Kr

the semiconductor commonly used today, deron physical Properties and the resulting non-linearities must be taken into account.

A certain amount occurs with setpoint / actual value comparators in particular Difficulty by the. Lock voltage of the base-emitter path occurring in transistors. A target-actual value comparator is formed similar to summing amplifier from If analog computers are used, the summing amplifier requires high amplifications and good operating point stability for exact summations necessary. In particular with direct current summing amplifiers, this requires a not inconsiderable amount of effort. and the effects of the drifting of the operating points must be compensated.

Another known type of setpoint-actual value comparator is given by the use of differential amplifiers; however, here too there is a considerable amount of circuitry Effort required to "influence" the threshold voltage, for example of semiconductors on the sensitivity of the Switch off the setpoint-actual value comparator, among other things, if possible small differences between setpoints and actual values - still, to grasp exactly,

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Stuttgart

The solution to the problem is with one. »; Ollv: er ': - Ir- ■, ·; ■■ -;:? ·; -Verger <: er" type mentioned at the beginning therein, d: .f Mv * .S; :: itter of the two names connected transistors in .-: -: en separate power circuit are turned on so that ^ wisci ^: -.. 1 "x: Emitteranschiüssen a constant ^{Pctentialuntersci:} .ci DOMINION ■ of the Potentialttnterschied avischen the terminals, ': ~ rr> etrisbsspannungsquelle opposite is , ur.ä approx. ".. ier -._ ^{; 4th} -value by the voltage which is represented by a gev.icsen kor ..: - Po t ent ialunt he differed Srr.it tez'o. This potential difference . ^ v; is-: 1 emitters of the two 'transistors kanr, for example svt ι. Zenardiode or an additional Dpannungsculle * · ./-. Verv; ends r.ai; a Zener diode, so nut d "-r Hr.itter
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The collector of an NPN input transistor TiO is connected to the line 10 via the resistor RLO and the collector of a PNP Singangstransistor TIl is connected to the line 11 via the resistor RIl. The base of the input transistor TLO is connected via the resistor Rl2 and the base of the input transistor TIl is connected to the point 12 via the resistor Rl3, to which the setpoint voltage is fed. The Geoer for the actual value is formed by the potentiometer Rl 4, on which the two taps 13 and IA can be moved. The taps 13 and 14 always have the same distance from one another, which is indicated by the connection 17 in the drawing. The resistance of the potentiometer changes linearly over the entire length swept by the taps. The potentiometer RlA- ict via a resistor R15 with the line 10 and Liher ainen resistor R16 with; the line 11 connected. In parallel • δι -if: · .ά potentiometer, a resistor Rl7 that changes with the temperature is arranged. This means that the actual circuit arrangement for comparing a setpoint value with an actual value is

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Claims (3)

Hoberb Bosch GmbH ß. 9262 Cl / Mr Stuttgart claims 1. Circuit arrangement for comparing a setpoint with an actual value, in which the series connection of two complementary Transistors is used, characterized in that the emitters of the two series-connected transistors are switched on in a separate circuit that P a constant potential difference between the emitter connections prevails, which opposes the potential difference between the connections of the operating voltage source is, and that the actual value is due to the voltage of the by a certain constant potential difference apart Emitter connections is shown. 2. Circuit arrangement according to claim 1, characterized in that that the base connections of two complementary input . transistors (TIo, TIl) the setpoint voltage is supplied, that the actual value can be removed from a potentiometer (R14-) connected to an operating voltage with two taps (13,14-) which constantly have a fixed, adjustable potential difference from one another, and that the "The emitter of the two input transistors (0? 1O, TIl) are cross-connected to the taps (IJ, 14) of the potentiometer (RIA), so that that input transistor (TIl) whose collector has a lower potential, and higher with the potentiometer (14) Potential connected- iat _{..; -T ^ 1} - rh'-φ-Ο 9825/0686 - 2 - Robert Bosch GmbH R. 9262 Cl / Mr Stuttgart 3. Circuit arrangement according to. Claim 2, characterized in that that the actual value potentiometer compensation elements (R17) are connected in parallel, the resistance of which varies with the ambient temperature changes. M-. Circuit arrangement according to Claims 1 to 3, characterized in that the coil connections of the input transistors are connected to the inputs of two amplifiers (T12, TiJ and T14-, Tl5), between their outputs. gen (15, 16) the output signal is removable. • AD ORIGINAL 009825/0686 <fO Blank page