DE1962073C3 - Electronic group locking device for carrier frequency systems - Google Patents

Description

The main patent relates to an electronic group locking device for carrier frequency systems, which is in a failure of a primary group consisting of twelve telephone channels caused by disturbance these Group 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 see) no more than three channels are blocked at the same time and unlocked, the beginning and the end of a disturbance from a locking signal receiver by Schlie-Ben or opening a blocking contact specified and from the beginning of the blocking to the end of the Unlocking via a central alarm contact, a central alarm is given, with four each one Group of three assigned transistor switches are provided and the first transistor switch from Lock 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 that represents the central alarm contact, both from the locking signal receiver are controlled directly, as well as by the fourth transistor switch and the first transistor switch at closed blocking contact of the blocking signal receiver is conductive, the second transistor switch at conductive first transistor switch delayed conductive and delayed when the first transistor switch is blocked is blocked, the third transistor switch with a conductive second transistor switch is delayed conductive and is blocked with a delay when the second transistor switch is blocked, the fourth transistor switch when it is conductive third transistor switch conductive delayed and blocked with blocked third transistor switch delayed 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 In the main patent, the transistor switches consist 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. The transistor switches miss high reverse voltages of over 100 V.

'' Withstand 5, switch through currents up to 200 mA and have residual voltages of around I V. Such pnp transistors are currently very expensive.

The object of this invention is for a

Group locking device according to the main patent an economic one Specify solution.

The solution to this problem is characterized according to the invention in that as a transistor switch NPN transistors are used in a collector circuit by short-circuiting their base and collector connections made conductive and blocked by breaking these short-circuit connections.

The figure shows an embodiment of the arrangement of the invention. The npn transistors TsI to 7s 5, whose collectors are connected to ground potential and whose emitters serve as outputs Gi to (74 and ZA) act as transistor switches. The base terminal of the first transistor switch Ts 1 can be connected to ground potential through the blocking contact K. Since the Delay circuits Vl, V2 and V3 are supplied by the operating voltage (not shown), which Heiner is the voltage to be switched through the blocking outputs C 1 to C 4, and the base connections of the delayed transistor switches have approximately the same potential as their emitters must be between the outputs The delay circuits and the base connections of the following transistor switch adapting elements are arranged. PNP transistors Tshi to 7s / i3 are used as such adapting elements, which must hold the same blocking voltage as the transistor switches, but only have to draw the base current of the transistor switches. The base connections of the transistor Switches Ts2 to 7s4 are connected to ground potential via the collector-emitter paths of the pnp transistors Tsh i to Tsh 3 when the pnp transistors are made conductive by the output voltages of the delay circuits in front of them.

The base connection of the fifth transistor switch Ts 5 can be connected to ground potential both via the decoupling diode D 1 and the blocking contact K and via the decoupling diode D 2 and the collector-emitter path of the fourth transistor switch.

The locking device works as follows:

If the blocking contact K is closed and thus de; When the blocking process is initiated, the first transistor switch 7s 1 becomes conductive without delay. The delay circuit Vl, which is controlled by the first transistor switch, controls the transistor Tsh after a delay time. 1 conductive, which in turn makes the transistor switch Ts 2 conductive. Correspondingly, the third and fourth transistor switches Ts 3 and Ts 4 are rendered conductive with a delay by the delay circuits V2 and V3 located in front of them. The fifth transistor switch 7s5, which represents the Z-4 conact!;. is made conductive without delay at the beginning of the blocking process via the decoupling diode D 1 and the blocking contact K.

When unlocking, the process proceeds in the corresponding order. If the blocking contact K is opened, the transistor switch Ts 1 is immediately! locked. The transistor switches 7s 2, Ts 3. 7s4 are blocked one after the other with a delay. The fifth transistor switch 7s 5 remains conductive during the entire unlocking process. Namely, although the blocking contact K is open, it receives base current via the diode D 2 and the conductive fourth transistor switch Ts 4. Only when this transistor switch is blocked is the fifth transistor switch blocked again.

It is particularly advantageous that the first and fifth transistor switches are not on the emitter, but on controlled by the base. As a result, not all of the current from the first and is needed via the blocking contact 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.

1 sheet of drawings

Claims (6)

Patent claims: 1. Electronic group locking device for carrier frequency systems, in the event of failure of one of twelve telephone channels caused by interference existing primary group locks and unlocks this group in four groups of three against occupancy for the duration of the fault, in such a way that within a certain period of time (of e.g. 1 see) no more than three Channels are locked and unlocked at the same time, with the beginning and the end of a fault of a blocking signal receiver specified by closing or opening a blocking contact and from From the beginning of the blocking to the end of the unblocking via a central alarm contact, a central alarm is given, with four Tranistorschalier each assigned to a group of three are provided and the first transistor switch from the blocking signal receiver directly, the second transistor switch via a first delay circuit from the first transistor switch, the third transistor switch across 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 twistor switch, which represents the central alarm contact, both directly from the blocking signal receiver and from the fourth Transistor switches are controlled and the first transistor switch when the blocking contact is closed of the locking signal receiver is conductive, the second transistor switch when the first transistor switch is conductive delayed conductive and delayed blocked when the first transistor switch is blocked, the third transistor switch with conductive second transistor switch delayed conductive and with blocked second transistor switch is blocked with a delay, the fourth transistor switch at conductive third transistor switch delayed conductive and with blocked third transistor switch is blocked with a delay and the fifth transistor switch is conductive when either the blocking contact closed or the fourth transistor switch is conductive, according to patent 18 09 702, thereby characterized in that as transistor switches (TsI, Ts2, Ts 3, Ts4, Ts5) npn transistors in Collector circuit are used by short-circuiting their base and collector connections made conductive and blocked by breaking these short-circuit connections. 2. Electronic locking device according to claim 1, characterized in that the collectors of the transistor switches (TsI, Fs2, Ts3, Ts4, Ts5) are connected to ground potential and their emitters as outputs (G 1, G 2, G 3, G 4, ZA ) d \ enen. 3. Electronic locking device according to claim I or 2, characterized in that the base connection of the first transistor switch (Ts 1) is connected via the blocking contact (K) m \ i ground potential. 4. Electronic locking device according to claim 1 or 2, characterized in that between the outputs of the delay circuits (Vl, V2, V 3) and the Basisanschlüssc of their associated transistor switches (Ts 2, Ts-3, Ts 4) matching elements are arranged. 5. Electronic locking device according to claim 4, characterized in that as matching elements PNP transistors (Tsh 1, Tsh 2, Tsh 3) are used, the collector-emitter paths of which are arranged between the base connections of the subsequent transistor switches (Ts 2, Ts3, Ts4) and ground potential and whose base connections are controlled by the output voltage of the associated delay circuits will. 6. Electronic locking device according to claim 1 or 2, characterized in that the base connection of the fifth transistor switch (Ts 5) both via a decoupling diode (Dl) and the blocking contact (K) and via a further decoupling diode (D 2) and the collector Emitter path of the fourth transistor switch (Ts4) are connected to ground potential.