DE1962073A1 - Electronic group locking device for carrier frequency systems - Google Patents

Description

Electronic group locking device for carrier frequency systems.

(Addition to patent application P 18 09 702.4) The main patent application relates to an electronic group locking device for carrier frequency systems, which at a failure of one of twelve telephone channels caused by interference Primary group this group by means of a blocking signal receiver containing a blocking contact locks and unlocks against occupancy in four groups of three for the duration of the fault, in such a way that within a certain period of time (e.g. 1 sec) no more as three channels are locked and unlocked at the same time and at the beginning of the lock A central alarm is given through a central alarm contact until the end of unlocking is provided, four transistor switches each assigned to a group of three being provided are, of which the first transistor switch from the locking signal receiver directly, the second transistor switch via a borate delay circuit from the first transistor switch, the third transistor switch via a second delay circuit from the second transistor switch, the fourth transistor switch via a third delay circuit from the third transistor switch and a fifth transistor switch, which represents the central alarm contact, both directly from the locking signal receiver and are also controlled tom fourth transistor switch and wherein the first transistor switch is conductive when the blocking contact of the blocking signal receiver is closed, the second Transistor switch with conductive first transistor switch delayed conductive and when the first transistor switch is blocked, the third transistor switch is blocked with a delay when the second transistor switch is conductive, conductive with a delay and when the second transistor switch is blocked Transistor switch is blocked with a delay, the fourth transistor switch when conducting third transistor switch delayed conducting and when the third transistor switch is blocked is delayed blocked and the fifth transistor switch is conductive when either the blocking contact is closed or the fourth transistor switch is conductive.

According to claim 2 and the embodiment of the main patent exist the transistor switches made of pnp transistors. This has the advantage of being a relative simple control of the transistor switch, but the disadvantage that the device is expensive will. The transistor switches must withstand high reverse voltages of over 100V, Switch through currents up to 200 mA and have residual voltages of about 1V, such PNP transigtors are very expensive at the moment.

In order to obtain a more economical solution, the invention has been made as transistor switch npn transistors in collector circuit esnetzt, the made conductive by short-circuiting their base and collector connections and through Interrupting these short-circuit connections are blocked.

An embodiment of the arrangement according to the invention shows Figure. The npn transistors Tst to Ts5 and their X collectors act as transistor switches are connected to ground potential and their emitters serve as outputs G1 to Q4 and ZA. The base terminal of the first transistor switch Tsl can through the blocking contact K can be connected to earth potential. Since the delay circuits V i) Y2 and V3 from the operating voltage, not shown, which is smaller than that through the blocking outputs G1 to G4 is the voltage to be switched, are supplied and the base connections of the delayed transistor switches have about the same potential as their emitters must be between the outputs of the delay circuits and the base connections the subsequent transistor switch matching elements are arranged. As such Matching elements are used pnpe transistors Tshl to Tsh3, which are probably the must withstand the same reverse voltage as the transistor switch, but only the Base current of the transistor switch must draw. The base connections of the transistor switches Ts2 to Ts4 are Tsht via the collector-emitter paths of the pnp transistors to Tsh3 connected to earth potential if the pnp- Transistors conductive through the output voltages of the delay circuits in front of it The base connection of the fifth transistor switch Ts5 can be made both via the decoupling diode D1 and the blocking contact K as well as via de decoupling diode D2 and the collector-emitter path of the fourth transistor switch with ground potential get connected.

The mode of operation of the locking device is as follows: If the sporr contact K is closed and thus the locking process is initiated, the erate transistor switch is activated Tsl leading immediately. The delay circuit Vi used by the first transistor switch is controlled, controls the transistor Tshl conductive after a delay time which in turn makes the transistor switch Ts2 conductive. The third and fourth transistor switches Ts3 and Ts4 from the preceding delay circuits V2 and V3 made conductive with a delay. The fifth transistor switch Ts51 of the den ZA - represents contact, is instantaneous at the beginning of the blocking process via the decoupling diode D1 and the blocking contact K made conductive.

When unlocking, the process proceeds in the corresponding order. If the blocking contact K is opened, the transistor switch Ts1 is blocked immediately. The transistor switches Ts2, Ts3, Ts4 are blocked one after the other with a delay. Of the fifth transistor switch Ts5 remains conductive during the entire unlocking. He namely receives, although the blocking contact K is open over the Diode D2 and the conductive fourth pransistor switch Ts4 base current. Only when If this transistor switch is blocked, the fifth transistor switch also becomes or blocked.

It is particularly advantageous that the first and fifth transistor switches not by the emitter, but by the base. This takes over the Blocking contact not the entire current of the first and fifth transistor switch to flow, but only the much smaller base current of these transistors. This is especially important if an electronic contact is used as a blocking contact will.

Claims (6)

P a t e n t a n s p r ü c h e: 1) Electronic group control device for carrier frequency systems, the in the event of failure of one of twelve telephone channels caused by interference existing primary group containing this group by means of an eliien blocking contact Blocking signal receiver for the duration of the disturbance in four dreler groups against occupancy locks and unlocks in such a way that within a certain period of time (from e.g. t sec) no more than three channels are locked and unlocked at the same time uni from the beginning of the locking to the end of the unlocking via a central alarm contact a central alarm is given, with four each assigned to a group of three Transistor switches are provided, of which the first transistor switch from the blocking signal receiver directly, the second transistor switch via a first delay circuit from first transistor switch, the third transistor switch via a second delay circuit from the second transistor switch, the fourth transistor switch via a third delay circuit from the third transistor switch and a fifth transistor switch, which is the central alarm contact represents, both from the locking signal receiver directly and from the fourth transistor switch are controlled1 and wherein the first transistor switch bel closed blocking contact of the locking signal receiver is conductive, the second transistor switch is conductive advise Transjstorq switch delayed conductive and blocked the first transistor switch is blocked with a delay1 the third transistor switch delayed conductive when the second transistor switch is conductive and when the second is blocked The transistor switch is blocked with a delay, the fourth transistor switch when it is conductive third transistor switch delayed conducting and when the third transistor switch is blocked is blocked with a delay and the fifth transistor switch is conductive1 if either the blocking contact is closed or the fourth transistor switch is conductive, after Patent application P i8 o9 702.4, characterized in that as a transistor switch (Ts1, Ts2, Ts3, Ts4, Ts5) npn transistors are used in a collector circuit which are made conductive by short-circuiting their base and collector connections and be blocked by breaking these short-circuit connections. 2) Electronic locking device according to claim 1, characterized in 1 that the collectors of the transistor switches (Ts1, Ts2, Ts3 Ts4, Ts5) with ground potential are connected and their emitters serve as outputs (Gl, Gar G3, G4, ZA). 3) Electronic locking device according to claim t and 2, characterized in that that the base connection of the first transistor switch (Ts1) via the blocking contact (K) is connected to earth potential. 4) Electronic locking device according to claim 1 and 22, characterized in that that between the outputs of the delay circuits (X V2, V3) and the base connections the transistor switches assigned to them (Ts2, Ts3, Ts4) matching elements are arranged are. 5) Electronic locking device according to claim 1 and 4, characterized that pnp transistors (Tshl, Tsh2, Tsh3) are used as matching elements, their Collector-emitter paths between the base connections of the subsequent transistor switches (Ts2, Ts3, Ts4) and earth potential are arranged and their base connections from the Output voltage of the associated delay circuits can be controlled. 6) Electronic locking device according to claim 1 and 2, characterized in that that the base terminal of the fifth Trans gate switch (Ts5) both via a decoupling diode (D1) and the blocking contact (K) as well as another decoupling diode (D2) and the collector-emitter path of the fourth transistor switch (Ts4) with ground potential are connected.