SU1243141A1 - System for mine supervisory indication with remote power supply - Google Patents

Abstract

The device relates to shaft telemechanical systems with time division channels. The system noise immunity increases while reducing the power consumption of the remote power source. The device contains at the control point an AC source I. diode 2, distributor 3, inverter 4, clock frequency generator 5, two keys 6 and I1, delay unit 7, pulse shaper 8, parallel code to serial converter 9, element OR 10, two-wire communication line 12, threshold unit 13, blocks 14 matches, and at each controlled point there is a diode bridge 15, voltage divider 16, distributor 17, transistors 8, resistor I9, discriminator 20 and 2 pulse duration, decoder 22, key 23, RS flip-flop 24, additional voltage divider 25. The goal is achieved by introducing the generator 5, keys 6, JI and 23, block 7, driver 8, pulse converter 9, element OR 10, discriminators 20 and 21, decoder 22, RS flip-flop 24 and voltage divider 25. 2 Il. with S W 00 J..Ii.J

Description

one

Y |: tros:) ct about control signals to the mine telemechanical systems with time separation of channels and remote powering of the equipment of the control points along the two-wire communication line and can be used to transmit information about the state of the technological process in the mine.

The purpose of the invention is to improve the noise immunity of the system while reducing the energy consumption of the source of remote power.

FIG. a structural electrical diagram of a mine remote signaling system with remote power is presented; in fig. 2 - voltage plots, which show how the proposed system works.

The mine remote signaling system of the 1m power supply contains, at the control point, an alternating current source 1, diode 2, distributor 3, inverter 4, frequency generator 5, first key 6, delay unit 7, pulse shaper 8, parallel-to-code converter 9 serial, element OR 10, second switch 1), two-wire communication line 12, threshold block 13, match blocks 14, and at each controlled point — diode bridge 15, voltage divider 16, distributor 17, transistors 18, resistor 19, first discriminator 20 duration pulses, the second discriminator 21 of the pulse duration, the decoder 22, the key 23, the RS flip-flop 24, the additional voltage divider 25.

Mine remote signaling system with remote powering works as follows.

Information transfer from the control point to all controlled points connected in parallel to a two-wire communication line is performed simultaneously with the power supply and clock pulses using an AC source 1 located at the control point (Fig. 1)

An alternating current source 1 is controlled with a rectangular output alternating voltage. It is a source of direct voltage, which is converted into a diode alternating voltage and 11 °; .1,. Bill into a two-wire

0

five

20

3

five

25

55

thirty

35

40

45

50

pinyu 12 bond. Conversion of a constant voltage is carried out by a signal from the output of the key 11, the presence of a pulse at the control input of the AC source 1 corresponds to a pulse of positive polarity in the two-wire communication line 12, and the absence of a pulse at the corner input of the AC source 1 negative polarity impulse (Fig. 2x, j). The sequence of clock pulses from the key 1 output goes to the counting input of the distributor 3 and the first input of the converter 9. Since the system has a common source of clock pulses, the distributor 3 control points and the distributor 17 of each controlled point work synchronously and in phase.

The control signals transmitted from the control point to the controlled points contain the number of the controlled point (address) with which information is supposed to be exchanged, the information itself and the cyclic synchronization signal to increase the overall reliability of the system in case of random failure of one of the distributors. Distinctive features of control signals in a two-wire communication line are a three-fold increase in the duration of a clock pulse, while the cyclic synchronization signal is transmitted by a pulse of positive polarity, and the rest of the information is transmitted by pulses of negative polarity.

The transmitted signals are generated at the control point as follows.

The base frequency for the operation of the entire system is a sequence of pulses generated by a clock frequency generator 5. In the absence of transmitted information, the pulses from the output of the generator 5 pass the element OR 10 and the public key 11 to the input of the converter 9 and the counting input of the distributor 3.- At a certain step on the signal of the distributor 3, a positive voltage appears that opens 6 and through the element IPI 10 and the public key 11 passes to the counting input of the distributor 3. The distributor 3 stops at the n position, since the reverse occurs 3 243

on the connection from the output p to its counting input. At the same time, the key 6 is opened and transmits pulses from the generator 5 to the delay unit 7, which, after a time of 1.5 periods of the initial s frequency of the generator 5, generates a reset signal of the distributor 3. The key 6 is closed, the unit 7 is closed: 5, with a signal from the output O, the distributor 3 is transferred to its original position and the distributor 3 is ready for further counting of the pulses. Thus, at the output of the key P, a synchronization pulse is generated, the duration of which is three times longer than the initial pulse of the clock frequency of FIG. (2 O., 6, b).

Information on the transmission is entered into converter 9, where it is converted and in the form of a sequential binary code is fed to the second input of the former 8. In the absence of information on the transmission or if the corresponding code bit is O, the output 25 of the former 8 there is no voltage, the key 11 is in the open state. The sequence of clock pulses from the output of the element OR 10 passes unchanged to the counting input of the distributor 3, the first input of the converter 9 and to the control input of the AC source 1 (Fig. 2 b, d,) "

If the output of the converter 35 9 has a voltage corresponding to logical 1, then this clock at the output of the driver B will be logical 1. At the output of the inverter 4 there is no voltage, the key 11 40 closes, the pulses to the counting input of the distributor 3 and the first input stop the transducer 9. The entire signal shaping circuit is blocked by feedback from the 45 output of the key 11. Further start

carried out using pulses from generator 5, which are fed to

the first input of the driver 8. The driver of the 8 through the time equal to the one-50th period of the frequency of the generator 5,

regardless of the duration of the signal from the converter 9 stops the flow. positive voltage to the input of the inverter 4. The key 1I opens and 55 passes a sequence of pulses from the output of the element OR 10. Thus, the signal from the output of the form1414

The rotator 8 closes the key I1 for the time of one period of the frequency of the oscillator 5, which corresponds to cutting out one pulse of the initial frequency of the oscillator 5 (Fig. 2x). The pulse sequence from the output of the key 11 is the clock frequency for. the entire system and at the same time the carrier of control information: a wide gap between pulses corresponds to logical 1 transmission code at a given clock cycle, a wide pulse to a cyclic synchronization signal. In an alternating current source 1, this pulse train is converted to a rectangular alternating voltage, which is fed to all monitored points connected in parallel to the two-wire communication line 12 via a two-wire communication line I2. The incoming control point information is transmitted in cycles that are separated from each other by a synchronization pulse. At the beginning of each cycle, the code of the controlled item number is transmitted.

Reception of signals at each controlled point is as follows.

The controlled point is powered by a constant voltage from the rectifying diagonal of the diode bridge 15 (Fig. 2n). The signal voltage is removed from divider 16 and additional divider 25, while separator 16 is removed.

a signal corresponding to a positive half-cycle of alternating voltage. The signal at the direct output of the short-circuit flip-flop 24 corresponds to a positive half-period of voltage in the two-conductor: communication line 12, and at its inverse output to the negative half-period (Fig. 2 c, k). The signal from the direct output of the RS flip-flop 24 is used as clock pulses and is supplied to the key 23, which is in the closed state, the decoder 22 and the first discriminator 20. The distributor 17 is in the initial state; The pulses from the inverse Bbrxo ja of the RS flip-flop 24 are fed to the second discriminator 21, at the output of which the signal pulses appear when passing through the second discriminator, 21 wide pulses (Fig. 2m). When the received code combination of the address of the controlled point with the given decoder 22 matches the decoder 22 generates a control voltage to the key 23, which opens and passes the clock pulses to the counting input of the distributor 17. The distributor 17 starts counting the clock cycles. The remaining information signals from the output of the second discriminator 2 with on. The differences of the coincidence signal at the output of the decoder 22 can be used for telecontrol purposes on a given transmission cycle. At other controlled points, where the address code in the decoder 22 does not coincide with the specified one, the distributor 17 remains in the initial position. The first .discriminator 20 at each controlled point continues the analysis of the duration of the incoming pulses and at the end of the transmission cycle generates a pulse signal corresponding to the clock signal in the two-wire communication line 12 (Fig. 2n), which initializes the decoder 22. At that controlled point, where the address code in the decoder 22 is the same, the sync pulse re-initializes the decoder 22 and the distributor 17. The key 23 is closed.

Information transfer in the reverse direction from the controlled point to the control point can be carried out simultaneously with the arrival of remote control commands to the controlled point. When the address code in the decoder 22 coincides, the distributor 17 starts counting the clock pulses, opening the alternating signal from the 1-n outputs of the n transistors 18. When one of the contacts is closed, the rectifying diagonal of the diode bridge 15 is bridged by the resistor 19 for one clock period. The resistance of the resistor 19 is chosen to be significantly lower than the resistance of the divider 16 and the additional divider 25 and the resistance of the load connected to the downward diagonal of the diode bridge 15 (the power supply of the electronic circuit). The current, for example, of the negative half-wave of the alternating current source 1, passes at a controlled point mainly through a resistor 19, a closed contact and an open transistor 1.8 to the minus bus of a diode bridge 15 And to another wire of the two-wire communication line 12. Thus, a certain time position corresponds in a two-wire communication line 12 to a pulse of increased amplitude current, which is a pulse t (a signaling signal that is recorded at the control point by the threshold unit 13. The output signal of the threshold unit 13 is fed to the coincidence units 14, which distribute the received information on the relevant registration channels. At the same time from the converter 9, information is received about the number of the controlled point with which information is exchanged. and information is received similarly from another controlled point. Since the distributors 17 of all the other controlled points are in the initial state, the transistors 18 of these controlled points have no influence on the formation of signals from the controlled point with which information is exchanged.

Claims (1)

Invention Formula The mine teleservice system with remote power supply contains an AC source, diode, distributor, inverter at the control point, and a diode bridge at each controlled point, to the first one, the diagonal of which is connected to a two-wire link, voltage divider, the first whose output is connected to the top of the diode bridge connected to the first wire of the two-wire communication line, and the second output to the adjacent top of the diode bridge, distributor, n transistors, the emitters of which are connected to the second output of the cases the voltage of the base transistors are connected to the corresponding outputs of the distributor, a resistor, one output of which is connected to the collectors of transistors through appropriate relays, so that in order to increase the noise immunity of the system while reducing the power supply of the remote power source, controlling the serially connected clock generator, the first key and the delay unit, the pulse driver, the parallel-to-serial code converter, sequentially connected element OR and the second key, the output of which is connected to the control input of the AC source, the first input of the parallel code converter to the serial and counting input of the distributor, a threshold unit connected in parallel to the diode, the anode of which is connected to the first output of the AC source, and the cathode with the first wire of the two-wire communication line, the second wire of which is connected to the second output of the alternating current source, the coincidence blocks, the first inputs of which are connected to the output of the pores and the second inputs .- with the corresponding outputs of the distributor, the output of the clock generator is connected to the first input of the OR element and the first input of the pulse former, the second input of the first switch is connected to the last code of the distributor and the second input of the delay block is connected to output O of the distributor, and the output with the reset input of the distributor, the output of the parallel code to serial converter, the second input of which is an information input, is connected to the second input of the pulse impulse, the output of which is connected to the input of the inverter, the output of which is connected to the second input of the second key, and the first and second discriminators of the pulse duration, key, decoder, RG-trigger, additional voltage divider, the first output of which is connected to the top of the diode bridge connected to the second wire of the two-wire communication line, and the second output to the second voltage divider, the middle point of the voltage divider connected to the R input of the RS flip-flop, S input of which There is a middle point of the additional voltage divider, the direct output of the RS flip-flop is connected to the input of the first discriminator of the pulse duration, the first key input and the first input of the decoder, the output of which is connected to the second key input, the output of which is connected to the counter input of the distributor, and the inverse RS-flip-flop output through the second discriminator of the pulse duration is connected to the second input of the decoder, the third input of which is connected to the output of the first discriminator of the pulse duration and the reset input of the distribution The solder and the other end of the resistor are connected to the second wire of the two-wire communication line.