DE1813538A1 - Magnetic ring core stage for generating trailing edge pulses - Google Patents

Description

Magnetic ring core stage for generating trailing edge pulses The invention refers to a magnetic ring core stage for generating trailing edge pulses with a bias winding and at least one further control winding on the toroidal core as well as with a switching transistor for outputting the trailing edge pulses.

Such circuits are used to amplify and lengthen pulses required Dfe application chin ctuen with AND gates, the output pulses should emit on the trailing edge of the controlling impulses. With these circuit arrangements the length of the pulses output by the switching transistor depends on the number of turns the winding to which the base electrode of the associated switching transistor is connected is. If particularly long pulses are required, the so-called basic winding must be used have a correspondingly large number of turns. However, this is often inconsistent with the required miniaturization, because on toroidal cores with a small diameter only windings with a limited number of turns can be applied. With magnetic ring core stages with a high base number of turns there is therefore room for further control windings very limited.

Ring magnetic core stages of the type described here are included under the term "Pulse extender with delay" known in the literature and, for example, in the magazine SIGNAL UND DRAHT 55 (1963) 7, pages 112-115 explained in more detail. Here it can be seen from the corresponding circuit that to generate special long output pulses two base windings are provided, which are connected in series are. The disadvantage here is that this embodiment is particularly expensive of windings and a large winding space on the toroidal core.

The invention is based on the object of such magnetic trigger core stages to generate trailing edge pulses in such a way that the cost of base windings to control the associated switching transistor is kept particularly low, if long Output pulses are to be emitted.

According to the invention the object is achieved in that the bias winding at the same time serves as the base winding and in the control circuit of the switching transistor is involved.

As a result, it is achieved in an advantageous manner that with many magnetic ring core stages the usual basic winding can be omitted because it is also used as the basic winding Serving bias winding completely to control the switching transistor sufficient.

To generate particularly long output pulses, however, you can also use a base winding can be provided which is in series with the bias winding is included in the control circuit of the switching transistor. Also in this embodiment the cost of the control windings is considerably less than that of known ones Circuit arrangements of this kind.

It is also possible to have one already available as a basic winding to combine standing control winding with the bias winding so that by connecting or disconnecting this winding a corresponding variation in length the output pulse is reached.

An embodiment of the invention is hereinafter based on the Drawing explained in more detail.

The illustrated magnetic ring core stage consists of a toroidal core K1, which carries several control windings @@ nu a switching transistor TR1. @@@ H @@@@ der The toroidal core Kl @@ in @@ @@@ @@ @ emo @ enz, @@ @vormgheshtsiert.

nhh r 'r S This bias winding W2 is used at the same time to control the switching transistor TR1 and is for this reason with the control circuit, that is to say the base electrode B1 and the emitter electrode E1. Since the resistor R1, which is used to adjust the bias current through the Winding W2 is used, is significantly greater than the effective resistance of winding W2, this winding is at the positive emitter potential.

As a result, the switching transistor TR1 is without triggering the ring core K1 always blocked. The control winding W1 is dimensioned so that with a control pulse at the input E1 of the magnetic ring core stage the toroidal core despite the existing pre-magnetization is magnetized from position "0" to position "1". After the cessation of this impulse, i.e. on its trailing edge, the then only effective premagnetization of the Toroidal core K1 that this is magnetized back in the direction of the remanence position "0". In the premagnetization winding W2 which is also used as the base winding during this magnetic reversal process induces a control voltage directed in this way, that the switching transistor TR1 is briefly conductive. This is about the output A emitted a trailing edge pulse, the duration of which depends essentially on the number of turns depends on the winding W2. As soon as the magnetic reversal of the toroidal core K1 ends is, the switching transistor TR1 is blocked again.

If it is desired that the trailing edge pulses emitted via output A. Should be particularly long, a further base winding W4 can also be provided that are in series with the winding W2 in the control circuit of the switching transistor TR1 is switched.

It is also possible to have a feedback winding in the collector circuit W3 to switch on, the effect of the winding W2 during the remagnetization process the position "1" "reinforced in the position n o".

The application of the invention is not to the use of P-N-P transistors limited, but the use of N-P-N transistors is also possible.

Claims (2)

P a t e n t a n s p r ü c h e: 9 Magnetic ring core stage for generating trailing edge pulses with a Pre-magnetization and at least one other control winding on the toroidal core as well as with a switching transistor for outputting the trailing edge pulse, characterized in that, that the bias winding (W2) also serves as a base winding and is included in the control circuit (B1, El) of the switching transistor (TR1). 2. Magnet ring core stage according to claim 1, for particularly long trailing edge pulses, characterized in that an additional Ba8is winding (W4) in series with the Bias winding (W2) in the control circuit (B1, E1) of the switching transistor (TR1) is included.