SU1298939A1 - Device for switching telegraph signals - Google Patents

Abstract

This invention relates to communications. The purpose of the invention is to improve the accuracy of switching telegraph signals. The device contains an optocoupler 1, a block of 2 keys, an input block 3 of control. --Ve S 12 V I-0 - CZD -J - f J Y g-ha ffj-I 1 g J

Description

j esHCTop (P) 4, threshold block 5. Block 2 contains keys 8-11, load 12 and power supply 13. Unit 3 contains optocouplers 14 and 15. Key 6 and capacitor (K) 7 are reintroduced. In the initial state, in the absence of current in the LEDs of optocouplers 14 and 15, the keys of unit 2 are closed, the current through load 12 and P 4 does not leak. At the output of the .5 block, there is a low level voltage, as a result of which a current flows through the LED of the optocoupler 1, which opens its photodetector and

The invention relates to the field of communication and can be used in electronic telegraph devices and in data transmission equipment having telegraph inputs.

The aim of the invention is to improve the accuracy of the switching of telegraph signals.

Figure 1 shows the structural and electrical circuit diagram of the device; Fig. 2 illustrates stress plots showing its operation.

The device contains an optocoupler 1, a key block 2, an input control block 3, a resistor 4, a threshold block 5, a key 6 and a capacitor 7, the block 2 of keys containing IT keys 8-11, the load 12, and the power source 13, and the input block 3

control contains optocouplers 14 and 15. t

The device works as follows.

In the initial state, when there is no current in the LEDs of the optocouplers 14 and 15, the keys of the 2 key block are closed, the current through the load 12 and, therefore, through the resistor 4 does not flow. Since there is no current in resistor 4, a low voltage level is present at the output of the threshold unit 5, which has an open collector output, which is caused by a current through the LED of the optocoupler 1, which opens its photodetector and key 6.

When a current appears in one of the LEDs of the input optocouplers, for example, the optocoupler 14, the photodetection of the latter

key 6. When current appears in one of the LEDs of the input optocouplers, for example, in the optocoupler 14; key 6 closes. K 7 is charged from source 13 through P 4 and load 12. The current through load 12 decreases, the voltage decreases by P 4. As soon as the voltage on P 4 decreases to the threshold of unit 5, a low voltage level is output at its output . The optocoupler 1 and key 6 will open. To 7 is discharged through the key 6. The current through the load 12 begins to grow. 2 Il.

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the unlocking voltage is applied to the input of the key 9 (Fig. 2a). Key 9 opens. By virtue of the reverse link, the key 10 is also unlocked.

Through open keys 9, 10 and 6 in the load 12 (figure 2) begins to flow current. As soon as the current in the load 12 reaches the optimum value determined by the threshold of triggering the threshold unit 5, the voltage on the resistor 4 will be sufficient to turn on the threshold unit 5. The output of the threshold unit 5 (Fig. 22) is high and voltage through the LED of the optocoupler 1 is stopped, the photodetector of the optocoupler 1 is closed and the input current ceases to flow to the input of the switch 6 (Fig. 2). Key 6 closes (Figure 2e). The capacitor 7 starts to charge from the power source 13 through the resistor 4 and (Load 12 (Fig. 2B). The current through the load 12 as the condensate carrier 7 starts to decrease, the voltage across the resistor 4 decreases. As soon as the voltage on the resistor 4 reduced to the threshold threshold threshold 5, at its output through a low voltage level, the optocoupler 1 and the key 6 open. The capacitor 7 will begin to discharge through the key 6. The current through the load 12 will begin to grow.

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J5 Thus, when 14 or 15 input current is present on the optocoupler, the current in load 12 will be constant with small pulsations. Moreover, the magnitude of the ripple is much smaller in amplitude than the current in the load 12.

Claims (1)

Invention Formula . A device for switching telegraph signals containing an input control unit, the first and second outputs of which are connected respectively to the first and second inputs of the key block, as well as the threshold unit whose first input is connected to the first end of the resistor, the second input to the second output of the resistor and the first output of the key block, and the output of the threshold block is connected to the cathode an optocoupler LED, characterized in that, in order to improve the switching accuracy of telegraph signals, a key and a capacitor are entered, one output of which is connected to the first output of the key and the second output of the key unit, and the second output to the second output of the key The second terminal of which is connected to the third output of the control input unit, the anode of the optocoupler LED is connected to the power supply bus, and the anode and cathode of the photodiode of the optocoupler are connected respectively to the first and second inputs of the auxiliary key. Editor L.Gratillo Phage.2 Compiled by O. Andrushko Tehred A. Kravchuk Proofreader L. Patay Order 901/61 Circulation 639Subscription VNIZhM USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4