SU720825A1 - Inductive pulse receiver - Google Patents

Description

(54) RECEIVER OF INDUCTIVE PULSES

The invention relates to telephony, can be used in PBX for receiving control signals and effects in the inductive mode of transmission.

Known receiver inductive pulses, containing two threshold elements, the matching unit and the trigger 1.

However, the known receiver is not sufficiently robust.

The purpose of the invention is to improve the noise immunity of the circuit.

To do this, an inductive pulse receiver containing two threshold elements, a matching unit and a trigger are inserted into a triggering driver and a protection unit against false alarms, the threshold elements being connected respectively to the first and second inputs of the matching unit, the first output of which is connected to the first inputs of the triggering device impulses and block protection against false positives: the second output of the matching unit is connected to the second inputs of the driver trigger pulses and the block protection against false Positioning the; first and second block outputs

protection against false alarms are connected respectively with the first and second outputs of the driver trigger pulses and the first and second inputs of the trigger. The trigger pulse generator contains two traisitors, whose bases are the first and second inputs of the trigger pulse generator, the collectors of the transistors are the first and second outputs of the trigger pulse generator, and the emitters of the transistors are interconnected and connected to a common busbar.

Claims (3)

The protection unit against false positives contains two transistors, the emitters of which are interconnected and connected to a common bus, two arrays whose cathodes are connected to the bases of the first and second transistors, and the anodes are connected to a common line, and two capacitors whose first plates are connected respectively, with the bases of the first and second transistors, the collectors of which are, respectively, the first and second inputs of the protection unit against false alarms, the first and second, the outputs of which are the second masts of the first and second condensates oops. Btiaai i i; U -H Figure 1 shows the structural electrical circuit of the device; in fig. 2 is an electrical circuit diagram of a driver for triggering pulses, a protection unit against false alarms and a trigger. The inductive pulse receiver contains threshold elements 1, 2, matching unit 3, trigger 4, shaper -5 triggering pulses and a block b protection against false positives, and shaper 5 triggering pulses contains transistors 7, 8, block b protection against false positives, - transistors 9, 10, diodes 11, 12 and capacitors 13, 14, and the trigger 4 - transistors 15, 16. The receiver works as follows. The inductive impulses coming from the line arrive at the threshold elements 1, 2, where they are selected by level. If a positive inductive impulse comes from the line first, it will be TRIBUTE at the base of transistor 7, and positive at the base of transistor 8. Transistor 7 opens and sends a triggering pulse to the base of transistor 15, the capacitor 13 is discharging. Trigger 4, depending on the state in which it is located, can go into antibloc. After the end of the pulse at the base of the transistor 7, the latter is closed, and the charge of the capacitor 13 starts through the transistors 15 and 9. If at this time there are negative pulses at the base of the transistor 8, they close to ground, i.e. transistor 8 remains locked. Similarly, transistors 8, 16, and 10 work when a negative inductive pulse comes from the line. Due to the use of such a circuit, the reliability of the inductive pulse receiver is significantly increased, since the presence of a connection between the collectors of transistors 7, 8 and the bases of transistors 15, 16 makes it possible to ensure the reception of signals with a large spread of amplitudes of inductive pulses. Claim 1. Receiver of inductive pulses, containing two threshold elements, matching unit and trigger, characterized in that, in order to increase noise immunity, a driver for triggering impulses and a protection unit against false alarms, the first and second, threshold elements are connected to the first one and the second inputs of the matching unit, the first output of which is connected to the first inputs of the driver of the trigger pulses and the protection unit against false positives, the second output of the matching unit with one with the second input of the trigger pulses and protect the unit against false positives, the first and second outputs of the protection unit from false positives are respectively connected to first and second output of the starting pulse and the first and second flip-flop inputs. 2. The device according to claim 1, characterized in that the driver pulse generator contains two transistors, the bases of which are the first and second driver pulse driver terminals, the collectors of the transistors are the first and second outputs of the driver pulse generator, and the emitters of transistors are interconnected and connected to the common circuit. 3. The device according to claim 1, characterized in that the protection unit against false positives contains two transistors, the emitters of which are interconnected and connected to a common busbar. Two diodes, the cathodes of which are connected to the bases of the first and second transistors, and the anodes are connected to a common busbar, and two capacitors, the first plates of which are connected respectively to the bases of the first and second transistors, whose collectors are respectively the first and second inputs of the anti-alarms protection unit The first and second outputs of which are the second plates of the first and second capacitors. Sources of information taken into account in the examination 1. Report on the development of inductive impulse receivers, SRIAS, Leningrad, 1961, topic 1/5, fig. 6 (prototype).