DE1910354A1 - Pilot control device for communication systems with cyclic scanning of several pilots and subsequent control - Google Patents

Description

SIEMENS AKTIENGESELLSCHAFT; .- '"Munich, the ^α · ° ^;

Ϊ91Ό354

Pilot control device for communication systems with cyclic scanning of several pilots and subsequent regulation.

The invention relates to a pilot control device for message transmission systems rait cyclical-. Scanning several piIots and subsequent control, in which the setting

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elements field effect transistors are used, which have:. :, _{; ;} · A memory are controlled and, "at deiv each \ 7; ei.ls ^: aMiängig by the scanned pilot the charging and discharging circuit .. a's : y, ^:: } memory can be closed via a switch ^.; - -; -, - ^

....: - The modern carrier frequency systems a pilot control device are generally in-with "equipped this case,; -iiäuf strength; each transmission level a separate pilot scheme on Zxir ■: h simplification of the effort is, however, more and more loading ■ '■. -strebt, several similar Pilote that occur together in a closed apparatus unit by a:... single .;; ^/ Erten pilot receiver by means of a cyclic scanning in a Zen4 _o tralgeräteeinheit auszuv Similarly to the for the level control of the j ev / piece transfer bundle Required- :. borrowed control signals are distributed cyclically. The actuating element for level control must be provided with an actuating ■■ [■ [-'- "_ size memory so that the Manipulated variable at least; held at least for the time of the cycle period v / irdi; _: , -

Servomotors; ..- "■ can be used as manipulated variable storage, which drive mechanically variable resistors as' actuators. ^: - ^v _;;

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While mechanical actuators are no longer an option in modern communication systems because of the often required full electronic mode of operation, the implementation of electronic pilot control with the help of magnetic memories and electrically variable resistors is often difficult to achieve due to the uncertainty of the magnetic material. ·

In the patent application S 112 094 VIIIa / 21a2 was therefore already ein'e pilot control device "proposed based on the figure 1 should be explained in more detail.

A control amplifier RV is located in the course of the transmission line OL. The message flow is from right to left. Via the E Pilotauskopplungseinriehtung the pilot is separated from the -Übertragungssignal, a selector means 17 ₉ which may consist for example of a shift register, fed and being scanned as one of several. The output contact of the selector 17 is connected to the input of the Piiotempfähger PE, the output of which is in turn fed to a differential amplifier D, to which the setpoint DC voltage is fed as a comparison standard at its other input. A direct voltage proportional to the pilot alternating voltage is used as the controlled variable. The output of the differential amplifier D distorts one of the

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The deviation from the setpoint is dependent on the control deviation XW for the control evaluation: A ^ is supplied ":. ':""· ^: - _.; -.

If the control deviation; exceeds a predetermined limit value;, then ν for the case · that 'the control variable ^{: is} greater than the setpoint value, from the evaluation circuit ^: a reset -:;. pulse, e _n and, in the event that the controlled variable is smaller than the setpoint, a preset pulse e- is emitted. The control pulse itself is only "triggered" towards the end of the switch-on time t. cause switching of the synchronously running selectors 17 and 18. The Regclausv / ert circuit v / e now has two outputs, with the reset pulse .e .. V-- at one output and the advance pulse e “removable '...” at the other output. . is. "■■ · ..- .. '. ".. ^: -.-- ■ ■ :. "" - :., V ^: "'.-". ■

The dashed eingezeieh-v Riete circuit now described below, depending 'on the number of to be ^monitored: are turned on, and to be controlled Pilote in Yielfachschaltung at the two outputs of the Regelauswertschaltung, since the dashed portion of the circuit which is corresponding to the number available to be controlled capstan. The reset or advance pulses now come from the output of the control

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Ausv / extschaltiing to an OR gate ^r 1, which ■ is in turn connected on the output side to an AND gate 2; is. This AND gate is also, with the selector 18, the selector switch. connected device and therefore receives its switch-on signals_. Whenever both that, Anechalt-. signal and one of the two control impulses is applied ^: is it open. Then a relaxation winding Ii is excited,. their contact 1 as a switch in the charging and discharging circuit -. =; ". ' of serving as a storage capacitor 0 ^{liegt.Parallel,} at which capacitor is connected in the grid-cathode path of the field effect transistor used as the actuator 12. Meanwhile Kathbden-anode distance v / irkt dahel as "variable track resistance" R ITQ ^{GegenkOpplungsnetz-.} ■; ■■: vzerk of the control amplifier RY "Geleiikseite" of the contact 1 is connected via a resistor 3 to the negative pole of the power supply and via a diode 4 to the output line for the reset pulses of the pilot evaluation circuit. . λ

Passes for example, simultaneously with the turn-on e a reset pulse e "to the AND gate, as it is opened, the relay I attracts, .the relay contact 1 \ iixä closed and there nunm ^l the anode of the Dio.de ehr_ 4 positive potential obtained , the diode is ■ opened and the capacitor O via the ohmic resistor R

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and: the diode 4 discharges. As a result, however, the cathode voltage of the field effect transistor is reduced-:: V-. : the rail resistance increases, whereby the. Feedback - ^":.: Is also increased so that dieι gain of the amplifier control · reduced v / ill -..".; · _-

Where a pre-coat pulse simultaneously with the _turn-on::;. to the AND gate, the relay L also attracts _and:; ; -contact 1 is closed again. But now lies -. the capacitor G through the ohmic resistor R and 'den - / = -. Ohmic Vfisderstand 3 between the two terminals of the ¥ exsor ---. equilibrium voltage ßCLuelle, .v / oby charging the con-. =, - /, -_. capacitors takes place. The diode 4 is blocked and the ""'■' /...-. Liberation takes place in the opposite of the previously described process. At the output of the OR gate may also be mono-. "Capacitor 7 to be used, the incoming manipulated V; impulse shortened, so that the operating time of the relay inde- ^\; is dependent on the manipulated pulse width /;..

With such a circuit is obtained before the part _that: - in the often occurring controller units, the scarf-7 ·· tung simple and the cost is low .DES another; _that:; : from the central control unit, i.e. from the pilot receiver and the ^r / pllot evaluation, to the controller units only two / one multiple V \\ switched control signal lines, one each for up / down _::

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and one is required for downward rules. In addition then only one connection signal line per controller unit .; ".".:,. _

This purely digital signal transmission from the central control unit to the individual controller units also allows an easy exchange of devices from different manufacturers and a simple combination of the central control unit with Control units for a wide variety of control tasks.

What is uncomfortable with this arrangement, however, is that because of the Might linearity especially of the field effect transistors Step size between the control pulse during the charging or discharging process of the spear is different in size.

This Zv / corner was therefore with the same arrangement suggested the effective resistance for the discharge by connecting the further ohmic resistor in parallel via a diode which is switched on in such a way that it is permeable during the charging time of the storage tank. It is already achieved that the number of adjustment steps can be adapted to each other for both control devices.

The present invention has for its object to be a Pilot control device with Eeldeffekttransistors as control

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to create links in which the influence of the ■ non-linearity, especially of the field-effect transistors, is more likely to be disconnected. '/ ..' / \:. \ ^:

The Pirotreg'eleinrieleitung ^ v / ird, therefore according to the ^: Er-fi _; nding. designed to solve this problem in such a way that one contact of the switch with '.. the memory, and the other Eön-' clock with one connection Θί-ΛβΓ., ΡαΕα11.6.ΪΒΐ1ΐθ1ίυη; § '"."τ; Γβϊ '- \ - h bunden.istj ^^ whose one Zv / eig: from a ^^ series connection ■■. a diode that is polarized in the transmission direction when discharged and an ohmic resistor and its other Zv / eig from a series connection of a diode polarized in the conductive direction when charged and the emitter-capacitor-Strectee of an Iranian ,. " ■■ Störs, whose base is connected to a constant voltage divider fed by a constant voltage, and that the other connection of the parallel circuit ^ via a switching device controllable by a discharge signal to one pole of the DC supply voltage source and via a further ohmic resistor is connected to the other pole of the ^{DC supply voltage source..:} - '. "..; ^: ' --_ / ■ ", ;;: - ^: -V- "

Through these measures it is achieved that the succeeding disruptive step size differences compared to the above-described arrangement high v / pus -. "reduced"

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will. Furthermore, the through; such an arrangement achievable upper control range limit very: sharp »■ ■" "■ = ..

For the purpose of fully electronic runs> _s au 'the -Pilotregeleinrichtung can be a permeable in the event of the discharge transistor, the switching device. \ ^': As storage can be zv / eckmäßigerv / else how _r se known a capacitor using /.-.->. "-, -

The switch can also be used as a holding contact be designed whose your connection of the parallel circuit tongue facing during the break at a break contact is applied, which is at a tap of a zv; ischen the two Poles of the pre-supply DC voltage source Voltage divider and its working contact with the Base of the field effect transistor and one terminal of the Storage capacitor is connected. . . ■.

This ensures that any leakage currents between the normally open contact facing the charging capacitor and the two other contacts have such an effect that the controller migrates to a favorable central position during the adjustment pauses. _: '..- ■: "- -

A fixed bias voltage can also be applied to the further ohmic resistor. ■. \ _ _

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• In v / Eiterer design can also the v / eifere- "-. -. Ohmic resistance and the voltage divider for the Basis--"'DC the transistor via a zusätzliolien _-----::: ohmscheh resistance with this pole the supply equality--, V ₁₁ -V; / Voltage source must be connected. This has the advantage - that ':; _ the adjustment of the upper control limit and the charging current: "can be carried out simultaneously with one and the same resistor - ^., ;. ■' >

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On the basis of the exemplary embodiments according to FIGS. 2 and 3, - ': V as the Diagrannis according to Piß' · A-Mira the invention in more detail -.- _: ■ ".;V:" V

Of the. I-ad-ev / resistance R in TIg. 2 consists of a parallel circuit zv / ei er current branches, whereby the through S er! A circuit with a diode 1 only for the discharge -effective / g6- \. <- ■ ■ -8th branch contains an ohmic resistor 2 and in ·; * the branch of the emitter circuit of a transistor 4 is switched on by a diode 3 which is only effective for charging, the Easis of which is connected to a fixed bias voltage, which is e.g. The switch 7, which closes for a short time with each opening process, is arranged between the storage capacitor 8 ^: and the described charging resistor. The

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The connection of the charging resistor facing away from the switch is on the one hand connected to a resistor determining the charging current to the negative power supply potential, on the other hand it is switched on via the switching device 11 to the positive current supply potential as soon as it is switched on Downward adjustment signal is present. The switch 7 and the switching device 1'1 is thereby controlled by a rule evaluation A. “as it was described in the case of the arrangement according to FIG. 1 that has already been proposed. The adjustment of the control amplifier of the respective line and. the lines are also scanned in the same way as the The arrangement according to FIG. 1 described at the outset.

The arrangement has the advantage that the charging current is independent from the! state of charge of the storage capacitor, and thus the Step size is much less dependent on the jev / hasty controller position. ~

The negative voltage on the charging capacitor can cause a Do not exceed the value specified by the basic voltage divider. When this limit value is reached, the up to then constant charging current countered very quickly Zero.-It also takes place with further switch closures no charging and no upward regulation, more instead.

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Pie through, this "circuit arrangement- achievable upper control range limit is much sharper (curve -Jo- in ITg .. '4) -.""Than about one that can be achieved by a test resistor arranged in series with the output of the control field effect transistor ( Curve- a in "Pig." - 4). ~ ': ^ "- * ■ · ■■ -'■". ·:

Figure 4- shows the control characteristic, v / oböi-the.,.,. "Gain of the control amplifier is plotted over the sequence of setting steps. ^:: directed / arrows fitted curves Regelcharak- "■ - ^ teristik at discharge is can be seen that in Ealleb, namely in the inventive level regulator: dle." Hyst Zvi eres e s chen asc eigend he and dropping it Rege1-eharakteristik very is small.: ■ ■

In Pigür 3 an arrangement is shown in which "the dex switch 7 is designed as a changeover contact, with its Tongue facing the ladev / iderstand during the adjustment pause is applied to a normally closed contact, which is connected to one of a Voltage divider from the DC supply Bciuelle. , removedGitoten control potential connected 1st.

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The resistor 9 is also not connected to the negative power supply potential, but connected to a fixed preload, the Z.B-. through a voltage divider from the DC supply voltage sources can be derived and grounded. The existing base voltage divider used v / er den "which has the advantage that the adjustment the upper control range limit and the charging flow (Step size) with the resistance 10. alone can be made at the same time. '. . . "" -.

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6 claims

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Claims (6)

^; 191Q PA 9/432/7 - 14 - y "; ■ / ^/: _ [. Patent claims ■■ '■' "V Λ _: ; ' 1/. Pilot control device for communication /. : "■ =""■" ■.: _ Systems with cyclic scanning "of several · pilots and subsequent control, in which field ■ effect transistors are used as actuators, which are controlled via a memory and in which gev / eils depend on: from / scanned / scanned pilot the discharge circuit of a storage tank ^ can be closed via a switch, thereby geleenri- '. _ /: indicates that one contact of the switch (7th) with: the storage tank (8) and the other contact connected to one; .- terminal of a parallel circuit is connected whose · a Zv / eig of a series circuit of a decision at - ■ '-' charge in the forward poled diode (1) and an ohmic resistor (2). and its other Zv / eig. Γ a series connection of a diode (3), which is polarized when charging, and the emitter / collector path of a transistor (4) - its base; with one of a constant G. -Lay voltage fed 'voltage divider (5., 6) is connected, and that the other Connection of the parallel connection via a. - _; by a discharge signal controllable switching device ^; ■ (11) with one pole (+ UB) of the Tersorgimgsgleich-; ^; • ^: ■ /. ■ .- ■ ";;". ■:. ■: ■ - "1: 5'- ■ .- ■": ■■ - ■■ ;; ' 909838/1075; ■ - ■■■ 1910 3 5 A ΡΛ 9/432/7 '- 15 - . Voltage source and via another ohmic resistor (3) with the other pole (-UB) of the DC supply voltage source connected is. 2. Pilo.tregeleinrichtung according to claim 1, characterized in that that the switching device (11) is a transistor which is permeable when a discharge signal occurs is. - .. "-. '3. Pilot control device according to claim 1 or 2, characterized characterized in that the memory (8) is a capacitor. 4- pilot control device according to one of the preceding Claims, characterized in that the switch (7) is designed as a changeover contact, the terminal of which the tongue facing the parallel connection rests on a normally closed contact during the adjustment pause, which is on a tap of a zv / ischen the two poles of the supply equilibrium voltage connected voltage divider (12, 13) and its working contact with the base of the field effect transistor (14) and one terminal of the storage capacitor (8) is connected. I6 - 908838/107 5 BATH ORIGINAL pa 9/432/7 ^; ■: - ■; ■ '._ ■ - 16 - 5. FilotTegeleiiixiclaiiung after, one of the ■: Claims, äadurck characterized that ^{1 to} the v / pus ohmic ^^ resistance '(9). a "fixed Yorspänniing assigned .:"'. leads is. '■ - ■ "■ - ..;; ._ ■..'-; / - ■, ■ -" ■ "■■". . '^;'^ ^:: 6. Pilot control device according to one of the preceding ' Claims, characterized in that the v / more pus \ ohmic resistance: (9) and the voltage divider (5, 6) ^. ".-; .-- for the base DC voltage of the transistor. (4) via _ -. an additional ohmic ^ resistance ^ (10) -with this pole the DC supply voltage qU; elle un- "": ■ - ■■■ "■":. "- ä- is. . .- "■ -'-.- ■" _ .: '. "■■ - ■■ - ■' ■ 9D9838 / 1075