SU1451750A1 - Signal receiving device - Google Patents

Abstract

The invention relates to telemechanics and can be used in devices for remote and automated control of mine machines. The purpose of the invention is to increase the transmission distance by increasing the sensitivity of the device. The device for receiving signals comprises an optocoupler 1, wires 2 and 3 of the communication line, capacitors 4, 9, 16, resistor 5, optocoupler 6, resistors 7, 8, 10, 11, 12, diode 13, field-effect transistor 14, bipolar transistor 15. When using a device for receiving signals with an output to a load 17 of direct current, the latter is connected in series with the output thyristor of the first optocoupler 1. The device is operational, if at -. In the presence of a signal, capacitor 9 is charged to 1 V and higher, since the voltage of this capacitor acts directly on the input of the bipolar transistor 15. 2 or

Description

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The invention relates to telemechanics and can be used in devices for remote and automated control of mine machines.

The purpose of the invention is to increase the transmission distance by increasing the sensitivity of the device.

Fig. 1 shows the voltage form in a communication line in the absence of an input signal (a) and in the presence of input and output signals (b); 2 is a schematic diagram of the device.

The device for receiving signals comprises an optocoupler 1, wires 2 and 3 of the communication line, a capacitor 4, a resistor

5, optocoupler 6, resistor 7, resistor 8, second capacitor 9, resistors 10, 11, and 12, diode 13, field-effect transistor 14, bipolar transistor 15, third capacitor 16.

When using a device for receiving signals with an output to a DC load, this load 17 is connected in series with the output thyristor of the first optocoupler 1.

The device works as follows

If there is no transmitted signal in the line, then the voltage in the line has the form shown in Fig. 1a, and the voltage drop across resistor 5 is very small and not enough to affect the second optocoupler LED

6, the thyristor of the second optocoupler 6 is closed, the capacitor 9 is discharged and the thyristor of the first optocoupler 1 is closed.

If there is a signal in the communication line transmitted by shorting the end of the half-periods of positive polarity, then at the moment of short-circuiting the half-period a negative pulse is generated on the resistor 5 by attaching to the LED of the second optocoupler 6 through the resistor 7 in the conducting direction,

As a result, the thyristor of the second optocoupler 6 is unlocked and the capacitor 9 is charged along the circuit: the first lead of the charged capacitor 4, the capacitor 9, the resistor 8, the open thyristor of the second optocoupler 6, the second lead of the capacitor 4 After the capacitor 9 is charged, the second optocoupler 6 is closed.

After charging the capacitor 9, its discharge begins on the circuit: the condensate

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Sator 9, source - drain field-effect transistor 14, resistor 11, resistor 8, capacitor 9.

In the beginning of the negative half cycle, the voltage of this half cycle through the resistor 10 is applied to the gate-source transition of the field-effect transistor 14, as a result of which the field-effect transistor 14 is closed and the discharge current of the capacitor 9 passes through the circuit: capacitor 9, emitter-base transition of the bipolar transistor 15 , resistor 11, resistor 8, capacitor 9. As a result, the bipolar transistor 15 opens and the capacitor 16 precharged during the positive half-cycle of the circuit: wire 2, capacitor 16, diode 13, resistor 12, wire 3, is discharged through the circuit: the capacitor 16, the emitter-collector bipolar Tr-anzistora. 15, the LED of the optocoupler 1, capacitor 16. As a result of the passage of the discharge current of the capacitor 16 through the LED of the optocoupler 1, the thyristor of this optocoupler opens for the time of the negative half period.

The voltage waveform in the link when there is a signal transmitted by shorting the end of the half period is shown in FIG.

In the case of using the device as a receiving device with output to a direct current load in series with the thyristor of the optocoupler 1, the load 17 is turned on. In this case, the voltage shape in the presence of a signal transmitted by shorting the end of the half period is positive. The polarity has the form shown in Fig. 1b, and the rest of the circuit operation is similar to that described with the exception that the output thyristor does not short the opposite half period, but supplies power to the DC load (for example, a DC relay) .

When the resistors 8, 10, 11, 12, the diode 13, the bipolar transistor 15, the thyristor of the optocoupler 6 break, there is no signal at the output of the circuit, because current does not flow through the optocoupler LED 1 o In the breakdown of the bipolar transistor 15, there is no output signal since the capacitor 16 is not charged. When the capacitor 4 is broken and the resistor 5 is broken, the capacitor 9 remains discharged, even if the thyristor of the optocoupler 6 is opened. During the breakdown of the thyristor of the optocoupler 6, the capacitor 9 is recharged and by the beginning of the negative half-period the voltage across it is zero.

The proposed device is operational if, in the presence of a signal, the capacitor 9 is charged to 1 V and higher, since the voltage of this capacitor acts directly on the input of the bipolar transistor 15.

Claims (1)

Formula of invention e-f and f14 15 of the communication line is connected via a quarter resistor to the gate of the field-effect transistor, the source of which is connected to the first wire of the h line: to the emitter of the bipolar transistor and through the third capacitor to the anode of the diode and the cathode of the first opto-optodiode LED which is connected to the collector a bipolar transistor whose base is connected to the drain by 20 A device for receiving signals containing a first optocoupler, whose thyristor is connected in parallel with a communication line, the first wire of which is connected to the first terminals of the first and second capacitors, the second terminal of the last 25 transistor and through the fifth of which, through the first resistor, resistor to the thyristor anode, the second is connected to the thyristor anode of the second optocoupler, the cathode of the diode through the sixth optocoupler, the cathode of which is connected to the resistor connected to the second wire of the second optocoupler LED to the communication line. -. / Fc c / p.f Vy 1451750 to the second terminal of the first capacitor and through the second resistor with the second wire of the communication line, the anode of the LED of the second optocoupler is connected via the third resistor to the second wire of the communication line, the fourth, fifth, sixth resistors, diode, bipolar transistor, diode, field-effect transistor, o T 10, in order to increase the transmission distance by increasing the sensitivity of the device, a field-effect transistor and a third capacitor are inserted into it, the second line of the communication line is connected to the gate of the field-effect transistor through a quarter of the resistor, c is connected to the first wire line h: a communication, to the emitter of the bipolar transistor and the capacitor through the third diode to the anode and cathode of the LED of the first optocoupler, the anode of which is connected to the collector of a bipolar transistor having a base connected to the drain po0 25 of the left transistor and through the fifth resistor to the anode of the thyristor of the second optocoupler, the cathode of the diode through the sixth resistor is connected to the second wire of the communication line.