SU853816A1 - Telegraphic signal repeater - Google Patents

Description

(54) DEVICE FOR TRANSLATION OF TELEGRAPH SIGNALS

I

The invention relates to communication technology and can be used in telegraph devices for various purposes.

A device for transmitting telegraph signals, containing an input unit with parallel-receiving LEDs of optocouplers A1, as well as an output unit in the form of a bridge circuit on switching transistors, switching on, is connected (the diagonal of which includes a power source, and another - a load unit, the control inputs of the opposite transistor transistors being interconnected via the photo receivers of the two receiving optocouplers 1.

However, the known device does not reliably work at temperatures above.

The aim of the invention is to increase the reliability of the device by extending the temperature range.

On this day, two lock-in devices with optical power and four power cables were introduced into the known device for the transmission of telegraph signals.

a diode, in series with the LEDs of one receiving optocoupler, controlling the first pair of opposite transistors, turned on the LED of the corresponding locking optocoupler, and sequentially with the LED of another receiving optotron, controlling the second pair of transistors, turned on the LED of the other corresponding locking optotron. The photodetectors of both locking optocouplers with series-connected resistors are connected respectively between the first and second pairs of mitmitters of the opposite pnp and pnp transistors, power diodes are connected between the transistors of the transistors and the corresponding poles of the power supply, which are connected to the bias resistors bases of transistors.

The drawing shows a circuit diagram of the proposed device.

20

The proposed device for transmitting telegraphic signals comprises a light-emitting diode 1, 2, receiving opto-switches 3, 4, an output unit 5, switching transistors 6, 7, 385

mutating pnp transistors 8, 9, power supply 10, load unit 11, photodetectors 12, 13, locking optocouplers 14, 15, power diodes 16-19, LEDs 20, 21, photodetectors 22, 23, resistors 24, 25 resistors 26-29. bias, diodes 30-33 resistors 34, 35, zener diodes 36, 37.

A device for broadcasting telegraph signals operates as follows.

In the absence of a signal at the input of the photodetector 12, 13 receiving optocouplers 3, 4 are closed, transistors 6-9 are also closed, and in the load block 11 there is no current. When a positive polarity arrives at the input, LEDs 2.21 are excited and photodetectors 13 and 23 open. When opening the photodetector 13, the power supply circuit of the base circuits of the transistors 9 and 6 is created: plus the power supply source 10, the power diode 17, the junction switch base of the 9 resistor , photodetector 13, zener diode 36, base-emitter junction of transistor 6, power diode 18, minus power supply 10. Through the load unit 11, a current flows through the circuit plus a power source 10, a diode 17, a switching pnp transistor 9, a diode 33, a resistor 35, a load unit 11, a diode 30, a transistor 6, a diode-18, minus the power source 10.

At the same time, when the photodetector 23 is opened, a current flows through the diode 16, 19 along the circuit: plus power supply 10, diode 16, light detector 23, resistor 25, diode 19, minus power supply 10. The voltage appearing on the diodes 16, 19, through the resistors 26, 27 is applied to the bases of the transistors 8, 7 and closes them.

When the negative polarity arrives at the input, the LEDs I and 20 are excited and the photodetectors 12 and 22 open, and the photodetectors 23 and 13 close. When opening the photodetector 12, the P1 circuit is formed by the base circuits of the transistors 8 and 7, which are opened, and current is flowing in the opposite direction along the circuit similar to the previous one through the load unit 11. When the photodetector 22 is opened, a current flows through the circuit through the diodes 17, 18, the analogs of the previous one, and the transistors and 9 are locked.

Technological and economic effect from the use of the proposed device for translation

telegraph signals is that simultaneously with switching current load provides reliable locking of opposite transistors that are not involved in switching, which allows to extend the temperature range of the device from 40 to 60 ° C. When you change the polarity of the incoming parcels from the bases of transistors, which should open, the bias is automatically turned off, which allows the use of low-power signals to control the device.

Claims (1)

Invention Formula A device for transmitting telegraph signals, containing an input unit with counter-parallel-connected LEDs of receiving optocouplers, as well as an output unit in the form of a bridge circuit on switching transistors, in one diagonal of which a power source is included, and in the other - a load unit, and the control inputs of the opposite pnp ppp transistors are interconnected via photo receivers of two receiving optocouplers, characterized in that, in order to increase the reliability of the device by expanding the temperature About the range, two locking optocouplers and four power diodes are inserted, and the LEDs of the corresponding locking optocouplers are turned on in series with the LEDs of one receiving optocoupler, and the LEDs of the other receive optocouplers are connected in series with the LEDs of another receiving optocouplers; the corresponding locking optocoupler, the photodetectors of both locking optocouplers with series-connected resistors are respectively connected between the emitte s first and second pairs of opposing p-p-p-p-p p transistors, power diodes connected between the emitters of the transistors and the respective poles of the power source which through resistors the displacements are connected to transistor bases. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 563739 Cl. H 04 L 25/20, 1975 (prototype).