SU789799A1 - Apparatus for recording bipolar current pulses - Google Patents

Description

The invention relates to a measurement technique and can be used in various devices to indicate the presence or polarity of current impulses, in particular, in telegraph receivers. A device for detecting bipolar current pulses is known, containing the first and second optoelectronic switches and a trigger. A disadvantage of this device is that it cannot record current pulses relative to two different current polarities with the same magnitude temperature and time variation of current transfer coefficients for different optocouplers, which leads to the distortion of the recorded signals The closest technical solution to the proposed A driver is a device for detecting two-pole current pulses with respect to two linear and absolute levels, containing a diode -MOST, first and second optoelectronic switches with LEDs, the first and second two-input elements AND NAND, trigger, and the device input is the diagonal of the diode bridge, the output diagonal of which includes the first input LED, and one of the arms the second LED, the output of the first optoelectronic OHHoro switch is connected to the first inputs of the wallpaper elements NAND,: the output of the second optoelectronic switch - with the second input of the second element NAND, the output of the first element NAND is connected to the first input of the trigger, the output of the second element NAND - NOT connected to the second input of the first element NAND and and the second input trigger 1,2. A disadvantage of the known device is that it cannot record unipolar current pulses. The purpose of the invention is to expand the functional capabilities and provide automatic setting of the mode of the known device for registering both bi-polar and unipolar current pulses. This goal is achieved by the fact that in the device for recording two-pole current pulses containing a diode bridge, the first and second

optoelectronic switches with LEDs, the first and second two-input elements are NOT a trigger, the device input being the diagonal of the diode hole, the output diagonal of which is connected to the first input LED, and one of the arms is connected to the second LED, the output of the first optoelectronic switch is connected to the first the inputs of both elements AND-NOT, the output of the second optoelectronic switch is connected to the second input of the second element AND-N the output of the first element AND-NOT connected to the first input of the trigger, the output of the second element AND-NOT connect There are five two-input elements AND-NOT, an inverter, a trigger, a delayed pulse shaper, the input of which is connected to the output of the first optoelectronic switch, the input of the inverter, the first inputs of the first and the second additional elements AND-NOT, the first input of the third additional element AND-NOT is connected to the output of the inverter, and the output is connected to the nepBfcJM input of the additional trigger, the second input of which is connected to the output of the second additional element AND-NOT, first the output of the additional trigger is connected to the second input of the fourth additional NAND element, the first input of which is connected to the first output of the main trigger, and the second output of the additional trigger is connected to the second input of the first additional element AND NAND, the output of which is connected to the first input of the fifth additional the NAND element, the output of which is the output of the device, and the second input of the fifth additional NAND element is connected to the output of the fourth additional NAND element,

FIG. 1 is a block diagram of a device for detecting double-pole current pulses; FIG. 2 - time diagrams that show his work.

A device for registering two-pole current pulses contains a diode bridge 1, the diagonal of which includes the input LED 2, the first optoelectronic switch 3, and one of the arms of the diode bridge 1 turns on the input LED 4 of the second optoelectronic switch 5. To the first inputs of the main elements AND-NOT 6 and 7, respectively, as well as to the first inputs of the first additional element AND-HE 8 and the second additional element AND-HE 9, to the inputs of the inverter 10, the driver 1 delayed pulses, consisting of the delay element 12 and the forms irovater 13 single pulses connected to the output of the first optoelectronic

switch 3. The output of the second optoelectronic switch 5 is connected to the second input of the main second element AND-NOT 7, the output of which is connected to the second input of the main first element AND-NO 6 and the second input of the main trigger 14, the first

the input of which is connected to the output of the first main element AND-NOT b. The output of the imaging unit 11 is connected to the second inputs of the second additional element AND-NOT 9 and the third additional element AND-NOT 15, the first input of which is connected to the output of the inverter 10, and the output to the first input of the additional trigger 16, the second input of which is connected to the output of the second additional element AND-9 The first output of the additional trigger 16 is connected to the second input of the fourth additional element AND-NOT 17, the first input of which is connected to the first output of the main trigger 14. The second output of the additional trigger 16 with of the connections to the second input of the first additional AND-NO element 8, whose output is connected to. the first input of the fifth additional element AND-NOT 18, the output of which is connected to the output terminal 19, and the second input is connected to the output of the fourth additional element AND-NOT 17. The input terminals 20 and 21 of the device are connected to the input diagonal of the diode bridge 1.

The device works as follows.

Depending on the type of current pulses (unipolar and bipolar) arriving at the device input, the trigger 16 is automatically set to the appropriate state, in which the received pulses are recorded. For example, if there are dual current impulses at the device input, the trigger 16 is set to the state when its first (left) output has a low potential, and the second has a high one which blocks the NAND-8 element and removes the blocking from the NAND element 17

The current of the positive direction of the double-pole pulse affects only the LED 2 of the first optoelectronic switch 3 from the output of which a low potential flows to the first inputs of the AND-NE 6 and 7 elements .- Since at this time the current through the LED 4 does not flow, the output of the second optoelectronic switch 5 to the second input element AND-NOT 7 receives a high potential, and at the output of the electric element AND-NOT 7 - a low potential that arrives at the second input of the trigger 14 and the second input of the element AND-NOT 6..If the simultaneous presence of the input element AND -NOT The 6 low potentials at its output produce a high potential, setting trigger 14 to a state in which high potential is at its first output. This potential arrives at the first input of the element AND-NOT 17, at the second input of which there is a low potential, and at the output a low potential that arrives at the second input of the element AND-NOT 18. At the first input, AND-NOT 18 when registering two-pole current pulses low potential, as the element AND-NOT 8 is blocked by the second input by the trigger 16. The simultaneous presence at the inputs of the element AND-NOT 18 low potentials gives at its output 19 - high potential.

When the current of the positive direction decreases to the value of + I (Fig. 2a), the optoelectronic switch 3 changes to the state at which a high potential appears at its output. This potential is present at the output of switch 3 until the input current changes its direction and reaches –1.

When the input current reaches -1, the output potential of the optoelectronic switch 3 again appears low. The current of the other direction now acts simultaneously on the light-emitting diode 4 of the second opto-electronic switch 5. When the current through the LED 4 reaches the value I, (Fig. 2a), the potential at the output of the second optoelectronic switch 5 will decrease. NOT 7 will receive low potentials, which will result in a high potential at its output and trigger 14 to another state, in which its first output and, accordingly, terminal 19 will be low potential. To eliminate the appearance of distortions, the condition 1, 1 7 s must be fulfilled. At the time ti, when the input signal has reached +14 (Fig. 2a) and the output of the optoelectronic switch 3 has a high potential (Fig. 2b), the delayed driver is turned on pulses 11 and through time t (Fig. 2g) forms a low potential pulse of duration 1, arriving at the second inputs of the elements. They are NOT 9 and 15. Time t, j | is selected such that it exceeds the duration of the high potential of the first optoelectronic switch 3 when registering the bipolar impedance:: KafTj t. C) - Through time tj; at the first input of the element NAND 15 - a high potential (after inversion by the element 10), and at the first input of the element NAND 9 - low. With the simultaneous presence of a low potential at the inputs of the AND-HI element 9, a high potential is produced at its output, confirming the condition of the trigger 16.

By reducing the current of the negative direction to a value; 1 with optoelectronic switch output

5 begins to receive a high potential at the second input of the Y-NE element 7. However, this potential change does not cause the appearance of a high potential at the output of the NAND element 6 and a change in the state of the trigger 14, since the first input of the NAND element

6c switch 3 receives a high potential (Fig. 2 a, d) .. At the moment of time when the input current. changed direction, reaches value

5 + |, a high potential appears at the output of the NAND element 6, since both potentials of the NAND element 6 have low potentials. This leads to a change in the state of the trigger 14, and, consequently, to a change in the potential at terminal 19. During the transition of the input current from the negative to the positive region, the delay pulse generator 11 is switched on again and, according to the principle described above, provides confirmation of the state of the trigger 16.

When unipolar current pulses arrive at the device input

0 and hitting them in the zone located between the levels, + 1, and -1 includes-with the shaper of impulse 11 at time 14 (Fig. 2a) and through time T and forms a low-potential impulse of duration t

5 (Fig. 2g) at the moment of time tj (the moment of transition of the device from the registration of two-pole current pulses to the registration of same-field current pulses). in this case 1-. | should not

0 to be greater than the duration of the currentless parcel at an instant of time tj, (FIG. 2a). At this point in time, low potentials are located at both inputs of the element AND NOT 15, therefore r at its

At the output 5, a high potential appears (Fig. 2h), which leads to a change in the state of the trigger 16, at which a high potential at its first (left) output (Fig. 2k) and a low potential at the second (Fig. 2n) . Such a co-operation of the trigger 16 blocks the operation of the NAND 17 element and removes the blocking from the NAND element 8. Now the output signal at terminal 19 is completely determined by the state of the optoelectric switch 3 and does not depend on the state of the trigger 14. In this mode work, if the device has unipolar current pulses at the input (of any polarity), npeBbmiawajHX in absolute value)),

0 at the output of the optoelectronic switch 3 there will be a low potential arriving at the first input of the element NAND 8, at the second input of which

S5 has a low potential that

causes the appearance of a high potential at the output of the element AND-NOT 8, the first input of the element is NOT-18, at the second input of which, when registering unipolar current pulses, there will be a low potential (since the element I / NOT 17 is blocked at the second input by the trigger sixteen). There will be a low potential at terminal 19.

If there is a currentless parcel at the input of the terminal 19 - a high potential {at the time of BpeNreHH t FIG. 2a). When each current-free sending of unipolar current pulses is received, the state of flip-flop 16 is confirmed until bipolar current pulses are sent to the device input, at the occurrence of which flip-flop 16 changes its state and the device switches to receive mode of bipolar impulses by the principle described above.

Thus, the device made in accordance with the present invention, 8 the difference from the known one, ensures the registration of both two-pole and single-pole current pulses with an automatically set pa6otB mode depending on the type of received signal.

The use of the proposed device in the input part of telegraph receivers will significantly reduce the time. maintenance and configuration of equipment, increase the degree of automation of telegraph receivers, reliability and reliability of communication.

Claims (2)

1. Galjuh L. L. Distortion analysis of the optoelectronic input device of the telegraph apparatus. - Problems of radio electronics, a series of the Technique of wire communication, issue 11, 1975, p.13. 2. The author's testimony of the USSR on article no. 2407797 / 18-21, 20.09.76.