DE1923310C - Arrangement for pilot monitoring for systems of night transmission technology - Google Patents

Description

3 4

failure the control switches off so quickly that one takes control. Due to the high repetition frequency of the impulses

Adjustment \ is reduced, and on the other hand the step-by-step adjustment of the transfluxor 7 occurs

Switching on again when the pilot setpoint is reached in the control loop does not appear. The Transfluxor 7

so delayed that the controller behaves like a proportional amplifier when it is briefly restored

return of the pilot signal not yet activated 5 high gain.

The circuit is expediently activated by

Return of the pilot cannot be destroyed. Speaking size of the setpoint current /., so a'oge-

A pilot monitoring of this type is particularly equal to the fact that the pilot current / ,, the desired value

has electronic level controls with high control. when the two impulses ./, and J ₁ in their '

speed demands. In addition, if io effect on the Transfluxor 7 will cancel,

Inadmissible deviation of the pilot voltage results in a high gain of this arrangement

circuit of the regulation with the help of only one crisis from the fact that a change in the pulse length

teriums reached, whereby one of the pulses J ₂ for this shutdown only during the control process

Minimum susceptibility to failure occurs. is required. In the steady state, the im-

If the cut-off speed is still to be reduced to the pulse length, in principle completely independent of the large one, the pilot voltage can always have the same value via a differential regulator setting. A Bezier link, consisting of a parallel connection of a limitation of the control loop gain is only 111-ohmic resistance and a capacitance to which directly, for. B. due to different sensitivity base of the first transistor of the monitoring of the transfluxor 7 for which in the curve form interconnection are performed. As a result, the regulation 20 different impulses V ₁ and J ₂ are switched off in different magnetization states even shortly before reaching the threshold value , because of the difference in the pilot voltage. borrowed load on the power supply depending on the controller

On the basis of an already proposed arrangement position and the resulting influence on the

according to FIG. 1 and the exemplary embodiments according to the circuit, e.g. B. on the size of the setpoint current /, ·.

the F i g. 2 and 3 the invention is explained in more detail. 25 The already high gain is due to the

In the block diagram according to FIG. 1 contained use of a magnetic core for influencing line amplifier 1 is further increased in the course of the carrier frequency of the pulse length of the pulses J _2. quenz line 13 and contains the thermistor 11 as a addition to a low drift offers the magnetic core actuator. The output level of the line amplifier 1 arrangement 3 the possibility of control is measured by the pilot receiver 10, in a 30 necessary direct current inputs potential-free combined output level proportional direct current I _P to understand. If the pilot level falls by a certain value, it is implemented and fed to the controller 5 as a controlled variable. Value from the target level, the monitoring

The square wave generator 4 supplies the trans circuit 52 and stops the clock 53,

fluxor 7 with a square wave. The trans- As return lies between the winding 32

Depending on the magnetization state, fluxor 7 gives a 35 of the magnetic core delay arrangement 3 and the

more or less large part of it to DC output terminal 18 of the controller a from the resistor

direction and filtering as heating current /, / (manipulated variable) was 12 and the condenser connected in series

to the thermistor 11. Sator 61 formed FLC member. Occurs at "a rule

The magnetization state of the transfluxor 7 process a change in the controller output current Jn can be indicated by the inputs 71 and 72 and thus the heating voltage at the thermistor 11, indicated by the windings by the pulses J ₁ and J ₂ so the capacitor 61 must be influenced on the new. The direction of action is voltage value charging or discharging. The for. opposite of the impulses. The pulse J ₁ causes a change in the charge required current flows in a counter-adjustment step in the direction of a smaller output-coupling sense via the resistor 12 through the currents (actuating currents). This impulse J ₁ 45 winding 32 and thus temporarily sets the rule is always the same size by means of a chain loop reinforcement.

generator discharge from the monostable multivibrator 8 This results in a so-called »yielding periodically delivered. The voltage-time integral of this feedback, which is initially purely proportional to the impulses, is expediently dimensioned in such a way, acting control loop, that when the transfluxor is controlled with the Im- 50 (PI controller) and the dynamic behavior of the control pulses J ₁ alone in the entire setting range improved with safety circuit.

is called just an adjustment of the transfluxor F i g. 2 shows a block diagram that occurs with Off towards the blocked state. The pulse of the monitoring device with the block repetition frequency is determined by the clock generator 53, as shown in FIG. 1 matches. The over- and is high compared to the reciprocal thermistor monitoring takes place in this arrangement in such a way that interim constants. At a thermistor time constant in see the monostable multivibrator 8 and the size of about 3 seconds, the pulse train clock 53 is an electronic switch 54, the frequency z. B. 50 Hz. Except for the constant pulse J ₁ Actuated as a function of the monitoring circuit 52, the monostable multivibrator 8 delivers with a.

a slight delay in the sense of a 60 With the help of the circuit diagram according to FIG. 3 is intended to show the position of the transfluxor 7 to a greater output mode of operation of the monitoring itself in more detail towards the impact of the pulse J _t . This rectangle-be made.

However, in contrast to the pulse J _1, the pulse J _s in F ^: g. 3 shown circuit arrangement met

due to the magnetic core arrangement 3 in its length with little effort, relatively small capacities influenced. The network core assembly 3 is attached to its 65 and exclusively electronic components

on the other hand to the requirements made with their inputs 31 and 32.

indicated windings due to the flow difference The clock generator 53 periodically triggers the mono

from the setpoint current /, and from the pilot current / _p stable multivibrator 8, which in its astable

Location of the pilot evaluation and a possible readjustment of the controller output voltage (manipulated variable) performs. If the pilot is absent, the monitoring circuit 52 stops by short-circuiting the Trigger pulses from the clock S3 fix the multivibrator 8 in its rest position. The control device remains on their last setting until the short circuit is canceled again by the monitoring circuit 52 will.

The static shutdown works as follows:

The pilot _{current / p} flows through the resistor 29 and generates the voltage U _v . This DC voltage reaches the base of the transistor 22 with collector resistor 24 via the resistor 21. Its collector voltage controls the transistor 26 via the Zcncrdiodc 23, the base of which is connected to the reference potential via the resistor 25.

The circuit is designed in such a way that transistor 22 is conductive (collector voltage approximately zero) and consequently the transistor 26 is blocked. The trigger pulses control the multivibrator 8.

If the pilot current falls to a lower value, the transistor 22 changes from the saturated to the blocked state. The collector voltage increases until the kink of the Zcncrdiode 23 plus The closing voltage of the base-emitter diode of the transistor 26 is exceeded. From now on electricity flows into the base of the transistor M-. which now opens. The trigger pulses are via the diode 28 and the The collector-emitter path of the transistor 26 is short-circuited.

If the pilot signal is switched on again, the transistor 22 opens again and the transistor 26 blocks.

δ The capacitor 27 initially represents a short circuit for the trigger pulses. The trigger pulses charge the capacitor 27 step by step via the diode 28. Only when the voltage on the capacitor 27 has reached a certain value, the multi-

ίο vibrator 8 and thus the control is released.

If the pilot current drops rapidly, the The regulation is stopped by the differentiating effect of the capacitor 20 parallel to the resistor 21, not only at the predetermined limit value below the target weight of the pilot, but much earlier. In this case, the charge-reversal current of the capacitor 20 blocks the transistor 22. As a result, the transistor 26 becomes conductive, the capacitor 27 is discharged via the low-voltage collector-emitter path and the

»O Trigger impulses are blocked.

If there is no complete pilot failure, but only a break-in, it is also shut down as described. However, as soon as the charge reversal of the capacitor 20 is completed, the transistor 22 is again

as is conductive and transistor 26 is blocked. Because of the < Capacitor 27, the regulation is put into operation with a delay wicdci.

If the pilot direct current fails after an e-functior with a worried time ticket, stay due to this accelerated shutdown tli « Regulation on the setting before the fault.

1 sheet of drawings

Claims (4)

Pilot tones under a ζ. B. 1-Np limit an over- Patent claims: monitoring circuit to switch off the control (and thus save the setting before the fault) or. 1. Arrangement for pilot monitoring in the event that the level controller has no “memory”, switch to the pilot control device for systems of the message 5 an average gain setting,
transmission technology in which an actuator is controlled via a transfluxor as a memory from the German Auslegeschrift 1 241 896, an arrangement for pilot control is already known, the control of which is a possible control for pilot evaluation and in which a monitoring circuit serves the control, with a clock switches off when the pilot level a certain transmitter connected, monostable multivibrator io specified Who; exceeds or falls below. That is provided, and in which a monitoring * - shutdown principle in this arrangement consists in circuitry is provided. which the actual value of that in case of inadmissible deviations of the Pilotbpan pilot signal is supplied to the dependent oscillate a monostable multivibrator of voltage and below a predetermined threshold class their positive inhibit pulse ZLSammen with a value of the pilot level responsive characterized on 15 ^ a clock coming Negative Schah denotes that the monitoring pulse is mixed in a mixer, whereby circuit (52) in the event of an impermissible drop in the switching pulse to such a potential, the pilot level is raised to an intermediate monostable that it is necessary for the actuation of a control multivibrator (8 ) and clock (53) lying winding of a transfluxor lying electronic electronic switch (54) in the sense of a switch-off 20 becomes ineffective. The control principle of this circuit ties the clock (53) known from the multivibrator circuit is based on the fact that a differential (8) actuated 'F i g. 2 and 3). voltage from setpoint and actual value above the above 2. Arrangement according to claim 1, characterized in that said electronic switch is periodically from . -nnzeich that the electronic switch (54) the clock is opened and closed to the from a series connection of a diode (28 and 25 control winding of the transfluxor is placed, whereby a charging and discharging capacitor (27) for an adjustment depending on the deviation of the pilot position (Fig. 3). voltage takes place in the Transfluxor. 3. Arrangement according to claim 2, characterized in that the effectiveness of the shutdown of the entire indicates that the monitoring circuit (52) control in the event of an impermissible deviation of the pilot from a first voltage which is conductive at the pilot setpoint current is in this arrangement, however, from the Transistor '22), at the base of which there is the pilot-time assignment between the negative switching signal and in its collector-emitter pulse and the positive blocking pulse at the output Circle a series connection of a Zener diode of the monostable trigger circuit dependent, since the (23) and an ohmic resistor (25) is the blocking pulse of the flip-flop circuit at the mixer and that at the connection point of the latter two 35 must be applied until the switching pulse ab-elements is the basis of a second, in the case of pilot, target sounds. current blocked transistor (26), the object of the present invention is to provide a Create collector-emitter path parallel to the condenser pilot monitoring circuit, which is Sator (27) of the electronic switch (54) in a fanned manner and with low susceptibility to failure is arranged (Fig. 3). 4c falling below a predetermined threshold value 4. An arrangement according to claim 3, characterized the pilot voltage overall control possible, immediately indicates that the pilot voltage circuit via a shuts down and consisting jj after rectification of the fault of the pilot differentiator from a parallel _e control after a predetermined delay, of an ohmic resistor (21) and on again. a capacity (20), to the base of the first tran- 45 To solve this problem, the arrangement sistor (22) of the monitoring circuit (52) of the type mentioned initially for pilot monitoring according to leads is (Fig. 3). the invention designed such that the About monitoring circuit in the event of an impermissible drop in the pilot level between clock and mono 50 stable multivibrator lying electronic switch in the sense of switching off the clock from Multivibrator activated. The electronic switch can be advantageous The invention relates to an arrangement for piloting consisting of a series connection of a diode and a monitoring device for a pilot control device for 55 and a discharge capacitor. The over systems of communication technology, in the case of a monitoring circuit, can expediently form an actuator via a transfluxor as a memory type that it is controlled by a first, in the case of pilot, for the control of which there is a transistor conducting the pilot nominal current, at the base of which it evaluates and, if necessary, regulates serving, with the pilot signal is applied and in whose collector a monostable multi-emitter circuit connected to a clock is provided a series circuit of a zener vibrator, and in which there is an over-diode and an ohmic resistor, and that monitoring circuit is provided, which is the one - at the junction of the latter two elements the value of the pilot signal is supplied and the base of a second, blocked with pilot target current is dependent on falling below a predetermined transistor whose collector-emitter path responds to the threshold value of the pilot level. 65 in parallel with the capacitor of the electronic switch Disturbances in the pilot path of a TF line may be arranged. do not question the transfer. From this through these measures one achieves the advantage Basically, in the event of a pilot failure or when the sinks, a pilot monitoring system is obtained, which in the event of a pilot