DE4426804A1 - Electromagnetic monostable, non-latching relay - Google Patents

Description

The invention relates to an electronic monostable, non-latching relay.

Such a relay takes on a de-energized state te rest switch position on or falls when opening the Erre contact in this rest switch position.

The one required to fully respond to a relay Response current or which is the product of response current and number of turns resulting in excitation winding relay is considerably larger than that for holding of a relay required holding current or the corresponding stopping excitement.

In connection with storage technology built in relay technology and locking circuits, the purpose of which is to signal a certain switching process and that Maintain signal after the switching process ends hold circuits are known which cause that brought up due to the switching process Relay keeps itself.

In a first known hold circuit (manual of Relay circuit technology, J.Th.Appels and B.H. Geels; Philips technical library, 1967; Page 55) is the pathogen con clock by which the excitation circuit is closed to to bring the relay into action, a circuit branch paral Switched on, which is a normally open contact of the relay as well contains a current limiting resistor. After tightening the Relay and closing of the above-mentioned make contact flows then according to the effect of the limiting resistance a holding current that is lower than the response current.  

In another known hold circuit (see the same Find) is next to the actual pathogen development Holding winding provided, the excitation circuit by a Normally open contact of the relay is switched, also here a holding current with a decrease compared to the starting current value flows.

Prerequisite for the functioning of the circuits mentioned with regard to the current reduction, it is natural that the Excitation contact of the relay opened again after it has picked up becomes.

The decrease in the value of the relay current from one to The draw value for a hold value is with regard to the current consumption and the heating of the relay especially then Interest if this is in the long term drawn state remains. In situations where one Many relays have the same supply voltage at the same time source is loaded, a relay current reduction to the Holding value is also of interest if the relay bet is relatively short. This situation is, for example in connection modules of telephone exchanges given a variety of from the same dish source-powered subscriber-specific relays simultaneously but practically only during the installation phase of the Connection modules are actuated.

The object of the invention is an electromagnetic cal monostable and latching relay to indicate that requires a low power requirement, while achieving this goal, however, only in terms of circuitry and technology little effort is required.

This task is accomplished by the in the characteristics of the patent measures specified resolved.  

In the relay according to the invention is part of the exciter winding is designed as a limiting resistor and is this Winding part a break contact of the relay connected in parallel. In contrast to the aforementioned holding circuits, here is So neither a separate holding circuit with a separate one provided holding winding, is still an additional Component in the form of a limiting resistor required Lich, since this limiting resistor is integrated in the coil is.

There is a particular advantage of the solution according to the invention in that the limiting resistance in its capacity supports the attraction effect as part of the pathogen development, so that despite the reduced holding current, at least not less holding effect is present and thus in Haltzu there was no change in the mechanical properties occurs (e.g. sensitivity to vibrations).

In addition, by integrating the limitation wi given full compatibility in the coil.

If the relay according to the invention, as in the aforementioned Example part of a multitude of relays of a participant meranschlußeinheit is the common power supply be designed for a reduced nominal current and work Tet therefore with a better efficiency. The total less heating of the subscriber line unit and the reduced electricity costs are advantages of such Use case are significant.

The invention will now be described by way of an embodiment game explained with reference to a drawing. The drawing shows the feed circuit of a fiction, ge moderate relay. This relay has a main winding W1 and an additional winding W2 belonging to the same winding body. The winding W2 forms a resistor which is dimensioned that when the winding W2 is activated, the im  Excitation circuit flowing current assumes a hold value and is preferably 40% of the suit value.

The winding W2 is bridged by a break contact r.

When actuating one in the excitation circuit, but not for Relay excitation contact e flows through the wick lung W1 is an excitation current that is in coordination with the winding Number of windings W1 is dimensioned so that the relay picks up.

The normally closed contact opens and switches winding W2 or the resistance formed by them in series with the wick lung W1 effective, so that now the aforementioned decreased Holding current flows.

Claims (2)

1. Electromagnetic monostable, non-self-relay, characterized in that part (W2) of the excitation winding (W1, W2) is out as a limiting resistor, and that this winding part (W2) has a normally closed contact (r) of the relay connected in parallel. 2. Relay according to claim 1, characterized in that the normally closed contact (R) together with the field winding (W1, W2) is housed in the relay housing.