DE2346528A1 - Variable time base for switching - on-off switching of power circuit controlled by input transducer with pre-selected on-off periods to a given sequence - Google Patents

Abstract

A precise time base is for on-off switching of power circuitry to a fixed sequence dependent upon the state of a measuring transducer e.g. temperature sensor. This is provided by bistables operated by a variable pulse generating circuit. In the specific example, the sensor contacts are coupled to switching relays, the contacts of which are connected to bistable relays connected in series across the pulse generating circuit. The pulse generator consists of two coupled bistables controlling the switch on and off points. When the supply to the circuit is connected, delay relays across the input lines ensure a preferential start-up state for the bistables. As soon as the input transducer switches the first bistable is set and an output order is generated for a period determined by the signal generator. At the same time the second bistable is put to a state of readiness. This procedure repeats each time the sensor contacts operate, with each bistable in the chain actuated in sequence.

Description

ERNST TESCH KG

56 Wuppertal 11
Grafrather Str. 124

electronic circuit arrangement for the connection and disconnection of circuits with a specific time

Sequence of steps

The invention relates to an electronic circuit arrangement for a step-by-step connection and disconnection of circuits in dependence on an electrical or physical quantity, in which the times of the individual steps can be set.

The application of such circuit arrangements are used, among other things, for temperature controls in which electrical Energy is to be converted into thermal energy. But also in other areas of power control physical or electrical type, for example for reactive power control, switching on and off is required in stages.

The electronic circuit arrangement according to the invention is also intended to be the same as the known conventional circuit arrangements ensure a coordinated supply of power by

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different quantities of electrical energy or switched off.

Since the physical quantities used from electrical energy have to be based on the local conditions, a predetermination of the times for the individual stages is impossible.

On the basis of an application example from refrigeration technology, briefly outlined here, which deals with refrigeration and the others are concerned with the application of the Kaite, the necessity of the Adjustability of the individual performance levels are made clear. If of cold production and equally of cold use When talking about it, it is obvious to consider the conditions of a cold store. The conditions of a cold store are to be considered from different points of view. Not only the conditions of the building complex, but also those of the Cooling system, which consists of several cooling units and works in several stages, as well as the amount and type of goods to be stored are points that have to influence the energy supply or its throttling.

In the systems used so far, in which the connection and disconnection was carried out by means of relays or contact chains, was the step activation by means of a timer carried out, but with this timing element a so-called pendulum switching of connection and disconnection of power

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prevent stages. This also applies to the use of program and step-by-step switches. It sure is possible to assign one or two timing relays to each individual power level; the effort would be "too great and too expensive not justifiable. In addition, the number of stages and the number of individual stages in the program switch units and step switch units Switch limited.

The purpose of the invention is to provide an electronic circuit arrangement to create, which can be used universally due to its expandability and with which the times for the individual Steps can be set separately without the use of additional timing relays.

The solution to the problem is essentially to be seen in the interaction of components known per se. To the base the circuit arrangement includes the input protection circuit 1a (Y / resistor), 1b (capacitor) and 1c (varistor), the delay relay d24 with its delayed contacts d 24.1, d24.2 and d24.3, the clock generator d23 with its containers d25.1, d23.2, d23.3 and d23.4 and two instantaneous switching relays d2i and d22 with their contacts d21.1, d2i.2, d21.3 or d22.1, d22.2 and d22.3, which are used for the supply and Disconnection of electrical circuits as a function of an electrical or physical variable, which is determined by a measuring device is determined, which in turn with a contact switching device that has a middle position, an upper axis

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position and a lower minimum position are controlled.

For the following functional example there are 10 switching stages provided: bistable relays d1 to d10 with 5 normally open contacts each and the designations d1.1 to d10.5, three diodes each with the designation 2.11 to 2.103, fixed resistors with the identification 3.1 to 3.10 and the adjustable resistors 4.1 to 4.10 and 5.1 to 5.10.

While the mode of operation of the delay relay d24 with its response delay can be assumed to be known, At this point, the mode of operation of the electronic clock generator d23 will be discussed in more detail. He has two time circles each of which is assigned a bistable relay. The function contacts of the clock, which are designed as changeover contacts are, lie on one side during the course of the first time cycle and during the course of the second time cycle on the other hand. As for the timing circuits of the contactor d23, there are bistable for the step relays d1 to diO Relays are used which, once reached, maintain a switching state even in the event of a power failure, until an opposite one Switching command is issued. Dahernflwn when commissioning of the circuit arrangement, the bistable relays are first brought into a defined starting position. Only from this position, also referred to as the zero position, can an exact, step-by-step connection and disconnection be achieved.

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Otherwise, by means of the attached figures and the related The puncture description of an example with 10 levels shows how the units work together.

Pig. 1 shows a diagram from which the connections of the

Circuits according to the task are to be taken,

Fig. 2 shows a circuit diagram with the arranged to the base Elements as well as the redirects A, B, C, D, E and P to the circuits of the following Piguren,

Pig. 3 shows the arrangement of the bistable step relays d1 to diO,

Pig. 4- shows the adjustable resistances that are applied to the timing circuits the clock work,

Pig. Figure 5 shows a circuit arrangement of four in operation Stages .

Like by Pig. 1, the individual circuits are switched on and off one after the other. Pure every connection and disconnection level a time adjustment option must be provided. ' In addition, a so-called zero position is shown in the drawing shown.

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By applying the control voltage to terminals a and b, Fig. 2, the input protective circuit 1a (resistor), 1b (capacitor)., 1c (varistor) and via the dormant switches d24.1, d24.2, d24.3 the defined starting position of all bistable Switching relay reached, i.e. the bistable stage relays d1 to diO received, following current path A, via diodes 2.11 to 2.101 and the fixed resistors 3.1 to 3.10 as well as the bistable switching relays of the clock generator d23 (in the drawing not shown) a related switching command.

At the same time, the delay relay d24 is energized which, after a fixed time of 0.5 seconds, activates the delayed relay Holders d24.1 to d24.3 actuated. The position of this switch is no longer changed as long as voltage is applied. With the Switching over the switch d24.1, the current path B is enabled (Fig. 2 and 3). The system is ready for operation.

The measuring device 6 shown in FIG. 2 is now detected by the physical variable which is the contact arrangement 7 Close a circuit above the upper max. limit value and switch on the instantaneous switching relay d21.

About the drawn position of the contact d23.1 and the now closed contact d21.2 as well as the diode 2.12 receive the first stage relay d1 (Fig. 3) a switching command. This is how the first stage of the system works.

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Since the step relays, as mentioned, are bistable Relay acts, the position of the first stage relay d1 is retained. The contacts of the d1 have the following position:

d1.1 switches from the drawn right to the left side

(Fig. 2) and issued the bistable switching relay of the first Time circuit of the clock generator d23 via the switch d10.1 a switching command,

d1.3 switches in preparation for the activation of the second stage,

d1.4 switches the control resistor via d23.4 (Fig. 4) and the current path E. 4.1 to the first time circuit of the clock generator d23,

d1.5 switches without any effect because d22.3 is open.

If the time of the first time circuit of the clock generator d 23 has expired, switch contacts d23.1, d23.2, d23.3 and d23, .4 ÜB, because it is assumed that the instantaneous switching relay d2i is still under tension via the contact arrangement 7. The stage relay d2 is now via the switched contact d23.1, the still closed contact d2i.3 and the through the excitation of the first stage closed contact d1.3 and the »iode 2.22 a switching command /. The second stage is thus the first has been switched on. The contacts of the step relay

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d2 switch in the same direction as those of the stage relay d1:

d2.1 switches from the drawn right to the left side (Fig. 2) and issues the switching command to the bistable relay of the second time circuit of the clock generator d23 via switches d1,1 and d10.1,

d2.2 blocks the possibility of resetting the stage relay d1,

d2.3 switches in preparation for the connection of the third stage,

d2.4 switches via d23.4 (Pig. 4) and current path F to the second stage associated variable resistor 4.2 to the second time circuit of the clock generator B d23.

At this point it should be noted that the stages can only be switched on immediately if, at the time of switching from the first to the second timing circuit of the clock generator d23, the measuring device 6 continues to be detected by the physical size and the contact arrangement 7 via the upper max .-Limit value the instantaneous switching relay d2i keeps voltage. If the measuring device 6 is no longer recorded by the physical variable and the contact arrangement 7 is in the middle position, the switching relay d21 would drop out before the time of a time cycle of the clock generator d23 has expired. The level reached is retained, but the time of the

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corresponding time cycle will go back to zero. In the event of a renewed energy request, the relay d2i again is addressed, the previously canceled time of the corresponding stage is not continued, but from the beginning repeated.

The activation of the further stages three to ten takes place under the same conditions and in the same way as they were recorded for levels 1 and 2.

Should be determined after reaching e4.rier est performance level The measuring device will require that the energy supply be throttled for conditions that have changed in the meantime 6 again recorded by the physical quantity, and the This time, contact arrangement 7 will close the circuit to the instantaneous switching relay d22 above the lower minimum limit value First of all, this means that at least the fourth level that has been reached must be switched off again. This state of the invention Switchgear with the positions of the contacts the bistable relays d1 to d4 in operation are shown in FIGS. 5a and 5b.

Via the contact d23.1, which takes the right position in the fourth stage, the now closed contact d22.3 and the-closed contact d5.2, the diode 2.43, - the resistor 3.4 the step relay d4 is given a switch back command so that the contacts belonging to the step relay d4

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return to their original position, i.e. among other things, that the adjustable resistance is switched off at this stage is created, the possibility for switching off the third stage is created and that the clock generator d23 from the second time circuit switches to the first time circuit. This also switches the clock generator contacts back to the left, The third stage has thus been reached. The adjustable resistance 5.3 comes into effect, so that an adjustable time also comes into effect for this reverse level. Will after After the set time, the instantaneous relay d22 will continue to be energized, is switched from the third to the second stage switched back, etc.

With the recorded 2u and subsequent switch-off of the individual stages, it is shown how the timing circuits of the clock generator are assigned to certain levels. The first time circle namely the levels d1, d3, d5, d? » d9 and the second time circle the steps d2, d4, d6, d8, d1O. Of course, this also applies to the assignment of the adjustable resistors. There is thus an interaction between the step relay and the two timing circuits, which is absolutely necessary to adhere to an exact step-by-step connection and disconnection if there is no danger wants to run that the circuit arrangement gets out of step.

Finally, it should be noted that in the event of a power failure, the delay relay d24 and its contacts will immediately switch to the

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The initial position falls back, so that when the voltage returns, all bistable relay for the defined starting position via current path A, diodes 2.11 to 2.101 and resistors 3.1 to be formed by 3.10

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Claims (1)

12 P 91.0973 Claim Electronic circuit arrangement with a depending on a physical or electrical variable influenced Contact device that acts on the measuring arrangement with its max. Position assigned to the upper limit value, the min. position assigned to the lower limit value and a neutral position, characterized in that by the connection of the following components, such as input protective circuit 1a, 1b, 1c, Time relay d24, Clock generator d23 with two bistable switching relays, two instantaneous switching relays d2i, d22, one to η bistable step switching relays d1 to dn, two adjustable resistors per step 4.1 to 4.n, 5.1 to 5.n, three diodes per stage 2.11 to 2.n3, one fixed resistor per stage 3.1 to 3.η a step-by-step connection and disconnection of circuits is possible, and that the time of each connection step and the can be set for each cut-off stage without having to use special timing relays. 5 0 9 813/0579