DE1089811B - Pulse-controlled relay chain for telecommunications, especially telephone systems - Google Patents

Description

The invention relates to pulse-controlled relay chains for telecommunications, in particular telephone systems, whose relays are arranged in groups and in which each relay of the one group has a rectifier in one group and in each relay of the other group a rectifier in the opposite group Forward direction is assigned and in which pulses alternating current direction relay control from each group.

Relay chains with the chain relays individually assigned energy stores are already known, which work without overlap in the operating time of the individual chain relays, and on the other hand there are too such relay chains are known in which the number of control contacts is already limited to a single one is. The disadvantage of these known relay chains is that the bridging-free chains require a considerable effort in terms of control contacts, while the second type of Chains not working without bridging.

The object of the invention is to combine both advantages in one circuit arrangement. This becomes through it achieves that each chain relay in series or parallel connection with an individually assigned Energy storage (capacitor or choke) firmly between a pulse line and a certain solid Counter potential, e.g. B. earth, is switched and that the energy state of each relay assigned in this way Energy storage by a single contact of the upstream relay in the chain, depending on this Switching state is influenced in a manner known per se. Through the fixed series connection of energy storage and chain relay when using a capacitor or parallel connection when using Using a choke as an energy store increases the need for control contacts to switch the chain limited to a minimum. At the same time caused by the rectifier and the control with pulses alternating current direction required switching sequence in interaction with the respective change the energy state of the energy storage unit permanently assigned to the respective chain relay through the single control contact of the upstream relay in the chain, an overlap-free switching of the Chain.

According to a further embodiment of the invention, the chain relays of all groups are controlled via a common impulse line and advantageously through periodic alternating current.

Instead of control by alternating current, control by means of an alternating current is also possible Switchover contact provided with a middle position is possible, via its contact spring, by means of pulses controlled, alternating with respect to the fixed pulse-controlled relay chain

for telecommunications, in particular

Telephone systems

Applicant:

Siemens Sd Halske Aktiengesellschaft,

Berlin and Munich,
Munich 2, Wittelsbacherplatz 2

Josef Liegsalz, Munich,
has been named as the inventor

Potential more positive and negative potential is applied to the pulse line.

An exemplary embodiment is shown in the drawing; however, only those for the invention are shown essential switching means.

In the idle state, the capacitors, which are permanently connected in series with the chain relays, are through the positive capacitors C1, C3. .. C [n- 1) - or by the negative half-wave of the alternating current - capacitors C 2, C 4 ... Cn - charged. The assignment is determined by the rectifier.

The chain is started by turning the contact on. The following circuit is closed:

1. ~, pr, a, G, E, C, an, earth.

During the negative half-wave of the controlling alternating current, the relay E in the circuit 1 responds and prepares the response circuit of the relay E1 by closing its contact e and discharging the capacitor C 1 via the discharge resistor Re . In the zero crossing of the controlling alternating current from negative to positive, the relay E drops out due to the blocking effect of the rectifier G , and its contact e is opened again. Almost simultaneously speaks in the circuit

2. ~ (positive half-wave), pr, a, El, Gl, C1, earth

the relay E1 by the charging current of the capacitor Cl on. By closing the contact until the relay £ 1 drops out in the next current zero crossing, the capacitor C 2 is discharged and thus the connection

009 609/82

Speech circuit prepared for relay E 2, which then responds with the negative half-wave, etc.

During a half-cycle, the individual capacitors are charged to such an extent that each associated relay will only have a small fault current flowing through it in the next period.

If the chain is to run cyclically, the control contact en of the last, τι-th relay of the chain is arranged parallel to contact e in the first switching stage with the relay El .

If the chain is to be at a certain switching stage, e.g. B. the third switching stage, are shut down, the chain is connected to the power source with high resistance by opening the contact pr. The relay in the chain, which has already been prepared by the shutdown switching stage, then receives fault current:

3. ~ (negative half-life), .i? />, A, GA, EA, C '4, earth.

The capacitor C 4 in this circuit is charged. In order to prevent the energized relay EZ from dropping in the third switching stage the next time the control current changes direction, a holding winding common to all chain relays is energized via a further contact pr , not shown - this circuit is not shown in the drawing. This common holding winding is dimensioned so that only the relay already addressed remains energized and all other relays in the chain cannot respond.

Claims (4)

Patent claims: 1. Pulse-controlled relay chain for telecommunications, especially telephone systems, the relays of which are arranged in groups and in which each relay of one group is assigned a rectifier in one and each relay of the other group is assigned a rectifier in the opposite direction and in which pulses alternating current direction alternately control relays from each group, characterized in that each relay (z. B. E2) in series or parallel connection with an individually assigned energy store (capacitor or choke) fixed between a pulse line (α) and a certain fixed counter-potential (z. B. earth) is switched and that the energy state of the energy storage device assigned to each relay in this way is influenced in a manner known per se by a single contact of the relay upstream in the chain depending on its switching state. 2. Circuit arrangement. According to claim 1, characterized in that - that with each relay (z. B. E2) of the chain, a capacitor (z. B. C2) is permanently connected in series and that this capacitor is connected by a contact (z. B . el) of the relay upstream in the chain (e.g. E 1) is discharged. 3. Circuit arrangement according to claim 1, characterized in that all relays in the chain can be controlled via a common impulse line (α). 4. Circuit arrangement according to claim 1 and 3, characterized in that the relays of the chain controlled by periodic alternating current. Considered publications:
German patent specifications No. 886 475, 1 018 922. 1 sheet of drawings © 009 609/82 9.60