Übersetzung für "Kontaktprellen" in Englisch

In a further development of the invention steps are taken to prevent contact bounce.

In a further development of the invention steps are taken to prevent contact bounce.

In the example according to FIG. 3, a contact bounce occurs upon contact closure.

Thus, any contact bounce occurring, for example, can be discriminated in a simple way.

With mechanical switching systems, this contact bounce is in principle not completely avoidable.

This prevents contact bounce or the like from causing disturbances of the initialization program.

Using a configurable time filter you can suppress contact bounce and noise pulses.

The delay achieved in this way can also already be sufficient for effectively avoiding contact bounce.

Contact bounce is a repeated unintentional opening and closing of contacts at high speed.

It has been found that the damping of the impact exerted by the mass ball 12 by the deflection of the second contact spring 16 prevents any contact bounce and consequently a clean trigger pulse of adequate duration can be generated.

Such contact bouncing is harmless since the high mechanical strength of the carbon fibers is fully effective to sustain the contact bouncing due to the appropriate alignment of the fibers.

It is a more specific object of the invention to design the electromagnetic relay of the type mentioned above in such a way that the frictional moment which acts against the armature rotation is reduced, and in case of a bistable design the problem of the undesirable central position is practically eliminated, and in case of flexure contacts any contact chatter caused by armature chatter is prevented.

In respect of the flexure contacts 37b, 39b there results the above-described advantage in the embodiment of FIG. 3 that even when the armature 31 upon movement reaches, say, the left-hand end position shown in FIG. 3 and abuts the upper end of the pole plate 32, the resulting chatter movements are not necessarily transmitted to the left-hand contact springs 37a, 37b because of the play provided between armature 31 and actuator 41, so that no contact chatter is caused between the left-hand contact spring 37b and the associated fixed contact 39b, which would be the case with a rigid connection between armature 31 and actuator 41 or when the actuator were formed integrally with the armature as in the prior art.

Since the mass of the abruptly stopped decelerated contact element is reduced, contact bounce is drastically reduced and, in some instances, is completely avoided.

As regards the flexure contacts explained above, in which the contact spring is urged to the closed position by the actuator, known relays further exhibit the drawback that chatter movements of the armature when the later reaches its end position which is limited by a stop member are transmitted to the contact spring where they lead to contact chatter.

It is an object of the invention to provide a contact apparatus in which contact bouncing is avoided by inexpensive means which require little space and which influence the switching characteristic as little as possible.

In the switch of German patent Publication DE 28 39 108 A1 arcing and contact bounce are supposedly reduced.

It is particularly advantageous here that even switching operations which take place in relatively brief succession, such as are caused, in particular, by contact bounce, or overvoltage pulses cannot effect any damaging momentary overcurrents.

It follows, that a positive or negative signal (logic “1” or logic “0”) is present only at the terminal 43 if the output of the comparator 37 provides either a positive signal for five sequential clock signals, or a negative signal for five sequential clock signals. As a result, the instantaneous status of the debouncer circuit 38 is maintained until the signal at the input S 1 has stabilized. The signal at the input S 1 may not be stable when contact bouncing occurs or when other undefined switching conditions prevail so that positive and negative signals occur at the output of the comparator 37 in a random sequence.

Since such switches are also used in applications where pulse-like exertions of force and/or accelerations occur, the contact bounce also has to be taken into consideration.

Such a contact bounce can occur in the inertia sensors mentioned at the outset if the accelerated mass rebounds a number of times from a limit stop on account of the pulse-like accelerations, whereby the minimum make times are then not fulfilled. SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION It is an object of the invention to provide a contact apparatus in which contact bouncing is avoided by inexpensive means which require little space and which influence the switching characteristic as little as possible.

In this case, the spacing s which exists in the rest condition between the massive body 17 and the impact body 16, must be smaller in a length d by which the impact body 16 may be displaced in bending the leaf spring 19 without opening the contact couple 14, 15, in order that contact bouncing is prevented or at least limited to a very small period of time.

The controller design incorporates hysteresis and a time delay (set at 8 seconds) to eliminate chatter and other excessive interactions between the sensor and generator.

When the breaker is closed, an undesirably great contact bounce is thus avoided which would occur when a spring with high stiffness is used.

When the switch is closed, an undesirably strong contact bounce is thus avoided which would occur when a spring with high stiffness is used.

An aspect of the present invention is therefore to provide an installation switching device of this generic type with a better dynamic response for breaking short-circuit currents, while avoiding contact bouncing.