DE1063212B - Pulse-controlled number chain for telecommunications, especially telephone systems - Google Patents

Description

GERMAN

The invention relates to a pulse-controlled counting chain for telecommunications, in particular Telephone systems in which a switching element in the chain changes its state with each pulse to be counted changes and the state change is generated by a common transmitter as a timing element brief current impulse is initiated.

In the known counting chains, in which the chain switching means are influenced by timing elements, z. B. capacitors, transformers or chokes, there are generally conditions for dimensioning the timing elements if only one switching device changes its state for each pulse to be counted target. If one wants to avoid this condition for the measurement of the timing elements, this is the case with the known ones Arrangements are only possible if you assign a timing element individually to each switching means, whereby the number of timing elements grows to the number of chain switching means, or if you change the arrangement the chain switching means hits so that for each pulse to be counted several chain switching means be influenced, whereby the number of control contacts of the chain switching means or the number the switching means itself increases.

The object of the invention is to avoid additional expenditure on timing elements, chain switching means or control contacts of the latter an influence of chain switching means via a common To enable transformers without special conditions for the dimensioning of this Transformer are given. This is achieved with the invention in that a state change of a chain switching device, excess current impulse amount of energy that is not required when the state changes of the chain switching means and the interruption caused by a contact assigned to the latter of the circuit used to influence the chain switching means at the interrupting one Contact swings out with sparking.

In an arrangement according to the invention, it is prevented, without additional expenditure on switching means, that the energy stored in the transformer serving as a timing element after influencing a first switching means can influence further switching means, since each time the state changes of the switching means to be influenced, the excess energy in an opening of the circuit of the influenced switching means resulting arc is consumed.

In the drawing, an embodiment of the invention is shown in which, according to further training all chain switching means at the beginning of a counting process via a common response winding actuated and, after the response excitation has been reduced, pulse-controlled counting chain for telecommunication, in particular telephone systems

Applicant:

Siemens & Halske Aktiengesellschaft,
Berlin and Munich,
Munich 2, Wittelsbacherplatz 2

Heinrich üelhack and Lothar Hoffmann, Munich,
have been named as inventors

on an excitation required for holding when the impulses to be counted arrive through the over the current surges generated by the transformer are switched back to the rest position.

It is of course also conceivable that all switching means of the chain at the beginning of the counting are pre-excited by pulses via a common winding, the pre-excitation being so dimensioned is that it is not sufficient to actuate the individual switching means, but is sufficient to keep it actuated. At a Such a counting chain, the chain switching means are then generated by the current surges generated by the transformer one after the other aroused and hold each other after their address on the common of pre-excitation serving winding.

The arrangement of the counting chain shown in the drawing is also made so that the current surge generated when the transformer is switched on supports the holding excitation of the chain switching means to be influenced, while the current surge generated when the transformer is switched off counteracts the holding excitation. In an arrangement in which the switching means are not actuated or pre-excited before the impulses arrive, the reverse procedure can accordingly be followed, so that the switch-on current surge counteracts the pre-excitation and the switch-off current surge supports the pre-excitation.

The structure and mode of operation of the exemplary embodiment are described below with reference to the figures explained in detail.

Before the start of the counting of pulses, the common response winding Ea is switched on by the briefly actuated contact 1 a. All chain switching devices operate their contacts. Contacts2el, 3e2 to IlelO are opened, and

909 607/82

Claims (3)

contacts 12el0, 13 el, 14 e 2 to 22el0 are closed. A common holding winding Bh is switched on by the contact 12 e 10. After the subsequent opening of the contact 1a, the excitation of the chain switching means via the winding Bh is such that the chain switching means remain effectively energized, but cannot become effective again after they have been de-energized via the individual windings B1 to E10. Normal relays, magnetic spring relays or relays made up of protective tube contacts can serve as chain switching means. The transformer Ue is switched on in pulses by the contact 23 t. The current surge generated at the beginning of a pulse when the contact 23i closes in the secondary winding II of the transformer is directed in such a way that the individual windings E1 to £ 10 are excited in a direction that supports the holding excitation. Only the (opposing) current impulse induced when the contact 23 i opens causes de-excitation of the respective chain switching means connected to the transformer. So z. B. at the end of the first pulse when the contact 23 i opens, the individual winding of the chain switching means E1 is excited so that the latter is returned to the rest position. The excess field energy of the transformer Ue when the contact 13el is opened is consumed in the arc or by sparking when the contact 13el is opened, so that the field of the transformer is completely reduced when the contact 2el is closed. With each further pulse, the switching means following in the chain is returned to the rest position and the circuit is accordingly prepared for the de-excitation of the switching means following in the chain. At the end of the tenth pulse, all ten chain switching means and, when the contact 12el0 opens, also the common holding winding Eh are switched off. Patent claims: 1. Pulse-controlled counting chain for telecommunications, in particular telephone systems, in each case The pulse to be counted is a switching element in the chain ίο changes its state and the state change through a shared transmitter is initiated as a timer generated short-term current surge, characterized in that a for changing the state of a chain switching device (z. B. £ 1) unnecessary excess surge energy amount at the change of state of the chain switching means (£ 1) and associated through a latter contact (13 el) caused interruption of the influencing of the chain switching means (£ 1) serving circuit at the interrupting contact ( 13el) swings out with sparking. 2. Pulse-controlled counting chain according to claim 1, characterized in that all chain switching means are actuated at the beginning of a counting process via a common response winding (Ea) and after reducing the response excitation to an excitation required for holding when the pulses to be counted arrive through the transformer (Ue ) generated current surges are switched back to the rest position. 3. Pulse-controlled counting chain according to claim 2, characterized in that the current surge generated when the transformer (Ue) is switched on supports the holding excitation of the chain switching means to be influenced (e.g. £ 1), while the current surge generated when the transformer is switched off counteracts the holding excitation. 1 sheet of drawings