DE1090267B - Circuit arrangement for self-running relay chains in telecommunications, especially telephone systems - Google Patents

Description

GERMAN

In telecommunications, in particular telephone systems, are used to carry out counting operations other relay chains are used, which are controlled by pulses depending on the intended use "or at expire on their own occasion. Possible applications exist as a test distributor, numeric transmitter or relay selector.

With the pulse-controlled relay chains, the counting or Switching speed determined by the Time interval between the individual pulses in a pulse train, in contrast with the self-running relay chains through the response and release times of the individual chain relays or the time-determining relays assigned to them Switches, such as condensers, rectifiers or short-circuit windings.

When using fast-switching relays, however, the implementation of such relay chains comes across difficulties when the counting or incrementing time is to be significantly longer than the working time the type of relay used. The cost of time-determining switching means is considerable. Asks In addition, exact incremental speeds are required, especially in the case of nipjit-adjusted relays with individual armature contacts - this refers to relays, the contacts of which are each through an individual armature be actuated or whose contacts form the armature itself - and their relatively wide tolerances in the Additional control elements are to be provided for response and fall times.

The object of the invention is to reduce the cost of the time-determining switching means to achieve a exact counting or incremental speed when using fast-switching, especially non-adjusted Reduce relays with single armature contacts to a minimum. This is achieved by that all chain relays are assigned a common delaying switching means and that this time-determining switching means is optionally switched on to the individual chain relays.

There are already relay chain circuits, but pulse-controlled, known in which all chain relays common switching means are provided in the form of a transformer or capacitor. In These circuit arrangements are used by the common switching means in contrast to the one according to the invention Circuit arrangement only as an energy store for controlling the chain relays.

The invention advantageously uses a switching throttle as a common time-determining switching means with rectangular hysteresis loop. During the remagnetization of the choke by a A small current flows through the winding, which is practically independent is of the height of the driving tension. Is on circuitry for self-draining

Relay chains in Fernnielde,
in particular telephone systems

Applicant:
Siemens & Halske Aktiengesellschaft,

Berlin and Munich,
Munich 2, Wittelsbactierplatz 2

Dr.-Ing. Kurt Fischer and Anton Greiter, Munich,
have been named as inventors

At the end of the magnetization reversal, the opposite saturation is reached, then the choke continues the driving Voltage no longer offers resistance. The current jumps from the small value during the Magnetization reversal to a final value caused by the voltage and the external resistances in the circuit is determined. Due to the sudden increase in current, the series connection of throttle and chain relays achieve a defined switching delay. By equipping the choke winding with multiple winding taps, the incremental speed of the relay chain can vary widely will.

Instead of the switching throttle, the same effect can also be achieved with a parallel connection of a capacitor with a series connection of Zener diode and respective chain relay.

What is essential when using both switching means is that due to the abrupt equalization process the scattering of the response times can be largely eliminated.

In FIGS. 1 and 2, two different exemplary embodiments are shown.

Fig. 1 shows a circuit arrangement in which the individual chain relays via a common control line controlled, and

2 shows a circuit arrangement in which the control is alternately via two separate control lines he follows.

The switching throttle, which is provided as a common time-determining switching means, is in both circuits equipped with two windings and one of the windings is assigned to one of the control lines. If one of them responds, either with the switching throttle

009 610/96

Series-connected chain relays E1, E2 ... Bn , this relay switches itself off via its own follow-up contact in a holding circuit and the switching throttle. In order to switch the chain on without bridging , an auxiliary relay Hl, HZ ... Hn is arranged parallel to each chain relay, which is switched on by a working contact of the associated chain relay and connects the switching throttle in series with the subsequent chain relay via its own working contact. If the chain is to work cyclically, the switching contact of the last auxiliary relay Hn of the relay chain is arranged parallel to the starting contact in the circuit of the first chain relay.

Further advantages of both circuit arrangements are the unlimited expandability in terms of the number of outputs and the low level of wear and tear, as there is only one relay pair per output is excited.

The mode of operation of the individual circuit arrangements will now be described below: By pressing the start button ST in FIG. 1, the relay An responds and, via its contact lan , switches on a relay C , which is placed in a hold circuit via its contact Ic. Contact 2 c simultaneously switches voltage to the already pre-excited switching inductor winding DrII:

1. Earth, DrII, 2c, -.

This ensures that the switching throttle remains negatively pre-excited for the entire duration of the connection of the relay chain (negative saturation of the switching throttle). The following circuit is also closed by a contact 2 on:

2. Earth, DrI, 2an, IeI, 3 e2, Bl, -.

The low current initially flowing through the winding Dr I, which is polarized opposite to the winding Dr II, causes a slow magnetic reversal of the switching inductor. During this time the relay El cannot respond. Only when the positive saturation of the switching throttle is reached and the current jumps from the small value during the remagnetization to the final value caused by the external resistances of the circuit 2, the relay El can respond and switches on via the working side of its own follow-up contact 1 e 1 in a holding circle:

3. Earth, IeI, 3e2, El, -.

Only when the holding circuit is closed is the idle side of the same contact opened, the switching throttle released and instantly remagnetized in circuit 1. The relay El switches on the associated auxiliary relay Hl via its contact 2el:

4. Earth, IeI, ZeZ, 2 * 1, Hl, -.

The switching inductor winding DrI is connected in series with the chain relay £ 2 via contact 1 h 1 , so that it responds analogously to circuit 2 after the switching inductor has been remagnetized and, as with the first switching stage, closes its own holding circuit via its contact Ie2 analogously to circuit 3, the switching throttle is released again and its auxiliary relay H 2 switches on.

By a further contact 3 e 2 , the circuits 3 and 4 of the first switching stage are separated and the relays El and Hl are brought to waste.

The next (third) switching stage is switched on via contact l / z2, etc. up to the last - η-th switching stage with relays En and Hn. The holding circuit for relay En and Hn is only separated when the relay chain is re-started ■ - · Press the start button ST again - or · with cyclical flow when the contact him is closed in the first switching stage and the relay El responds.

The response circuit of the relay An is dimensioned in such a way that it is only after the relay H1 has responded that the first

ίο Switching stage drops again.

In Fig. 2 is a relay chain in which the individual chain relays are combined into two groups that are fed alternately via two control lines. Here is every control line assigned a switching inductor winding, in such a way that the switching inductor is in the rest position is in the negative saturation and that both windings are polarized opposite.

By pressing the start button ST , the relay on again responds and switches with its contact to the winding DrI in series with the relay El. The following switching operations correspond to first where the circuit of Fig. 1 - · circuits 2 to 4. When turning the winding drii to the relay E2 by contact IHI is first, starting from the positive saturation of the switching throttle, the magnetic reversal and reaching negative saturation the response of relay E2 in the circuit:

S. Earth, DrII, IhI, UZ, 3e3, E2, -.

The following switching operations again correspond to those of the first switching stage. The third switching stage is switched on by the contact Ih2 , etc. The holding circuits for the relays En and Hn of the last switching stage are separated as in the circuit arrangement of FIG. 1.

Claims (8)

PATENT CLAIMS: 1. Circuit arrangement for self-running relay chains with in one or in two groups Combined high-speed switching chain relays and one or two control lines accordingly, z. B. for test distributors, numeric transmitters or relay dialers, in telecommunications, in particular telephone systems, characterized in that all chain relays have a common delaying switching means is assigned and that this time-determining switching means optionally the individual chain relay is switched on. 2. Circuit arrangement according to claim 1 and in particular when using unadjusted Relay with single armature contacts, characterized in that the one which is jointly assigned to the chain relays time-determining switching means a switching throttle in series with the chain relays with a rectangular hysteresis loop. 3. Circuit arrangement according to claim 2, characterized in that the switching throttle with is equipped with two windings. 4. Circuit arrangement according to claim 1, 2 and 3, characterized in that one of the two Switching choke windings assigned to the chain relay and the other as a pre-excited reset winding is switched. 5. Circuit arrangement according to claim 1, 2 and 3, characterized in that when divided the chain relay in two groups of even and odd ordinal numbers of each of these relay groups a switching inductor winding is assigned, the two windings being polarized in opposite directions. 6. Circuit arrangement according to claim 4 or 5, characterized in that when a chain relay (EI ₁ E 2 ... En) is selected in series with the switching throttle, a holding circuit is closed via a follow-up contact of the same relay and then the switching throttle is switched off. 7. Circuit arrangement according to claim 4 or 5, characterized in that an auxiliary relay (H 1, H 2 ... Hn) is arranged in particular for relay chains with bridging-free switching parallel to each chain relay, which is "switched on" by a normally open contact of the associated chain relay which switches the switching throttle in series with the next chain relay via its own working contact. 8. Circuit arrangement according to claim or 5, characterized in that when one responds Chain relay the chain relay of the previous switching stage is switched off. 1 sheet of drawings ® 009 610/96 9.60