SU561990A1 - Device for transmitting and receiving signals - Google Patents

Description

The invention is suitable for telemechanics and is intended for use in the mining industry.

Telemechanical devices are known that are constructed in accordance with the principle of inductive transfer of power supply and signals 1. These devices contain a cable communication line and a signal transformer connected to the IT line. These known devices are characterized by complexity and low lomecha. The closest to the invention in its technical essence is a device that, at the control point, contains a control, signaling and control unit, whose input is connected to the receiver output, an output to the transmitter input, the output of which is connected to the primary winding and 1 of its transformer, the receiver input is connected to the primary winding of the receiving transformer, and the power supply unit, made on the measuring transformer, the wires of the communication line, at the controlled point - the control and signal converting unit, to the first input the sensors of state of objects are connected to the first output - executive mechanisms, the second output is connected to the transmitter, to the outputs of which are connected oppositely connected first windings located on the extreme rods of the three-bar transformer, the second windings located on the extreme rods of the three-core transformer are connected consistently and consistently connected to the input of the receiver, the output of which is connected to the second input of the control and signal conversion unit, a winding placed on the center during the day the rod of the three-core transformer is connected to the power supply unit of the controlled point 2. However,

This known device has low noise immunity.

The aim of the invention is to improve noise immunity. In the proposed device, this is achieved by placing the first and second wires of the communication line at the controlled point in the windows of the three-rod transformer magnetic cores, one ends of which are connected to one output of the secondary winding of the receiving transformer through the third wire of the control transformer, with the middle terminal of the secondary winding of the transmitting transformer, the other winding outputs of which through capacitors are connected to the other ends of the first and second wires of the communication line, the output winding of the parametric transformer of the control unit power supply unit is connected in parallel with the fourth

the wire of the communication line located in the oks of the magnetic circuit of the three-rod transformer at the controlled point.

The drawing shows a diagram of the proposed device.

It contains control point (PU) 1, controlled points (CP) 2, power supply unit 3, made on a parametric transformer with output winding 4, fourth and second wires of communication lines 5 and 6, respectively, control, signaling and control unit 7, the transmitter 8, the transmitting transformer 9, the first wire of the communication line 10, the receiving transformer I, the receiver 12, the three-rod transformer 13 with the power winding 14, the power supply unit 15, the windings 16 and 17 of the three-rod transformer, receiver 18, the windings 19 and 20 of the three-core transformer, transmitter 21, the control and conversion unit 22, the object state sensors 23, the actuators 24 and the third wire of the communication line 25.

The power supply to the controlled points is supplied by induction through a three-rod transformer 13, made in the form of an W-shaped magnetic conductor using a power winding 14 and a power supply unit 15. The primary winding is formed by wires of communication lines 5 and 6.

Thus, the transformers of all gearboxes are connected to the wires of the communication lines in series and in fact are current transformers.

The wires of the communication line 6 receive energy from the power supply unit 3, which is made on a parametric transformer, i.e., it is in fact a parametric generator, the generation frequency of which coincides with the grid voltage applied to its primary winding. Due to the absence of inductive coupling between the primary and secondary (output) windings in the parametric transformer of the power supply unit 3, interference from the mains supply of 50-100 dB in the range of several hertz to units of megahertz is suppressed, therefore interference from the mains does not penetrate the wire of the communication line ten.

The signals for selecting gearboxes and control and monitoring objects are generated by the control, signaling and control unit 7 and fed to the transmitter 8, where they are converted into frequency bursts of a corresponding duration, then summed, amplified and fed to the primary winding of the transmitting transformer 9, from the output winding of which the pulses go to wires of communications lines 10 and 6.

Thus, in the wires of the communication line 10 there are radio pulses of current that induce the corresponding EMF on all windings of the three-core transformer 13.

At the input of the transmitter 21, the EMF of the signals is zero, since the windings 19 and 20 are switched on opposite, and at the input of the receiver 48, on the contrary, there is a total EMF from according to the included windings 16 and 17, In receiver 18

I

The signal extracted from filters, signals, are detected and sent as video pulses to a control and signal conversion unit 22, which decrypts received signals, generates signals to enable or disable actuators 24, interrogates the object state sensors 23 and generates signaling pulses reflecting No sensors 23. The signaling pulses arrive at the transmitter 21, where they are converted into pulses of a corresponding frequency, amplified and fed to the counter-connected windings and 19 and 20. At their switching on, the magnetic flux in the middle rod of the transformer 13, corresponding to the signaling pulses, is zero and there is no corresponding EMF in the winding of the power supply 14. In the windings 16 and 17, the EMF of the signaling impulses induced from the windings 19 and 20 is absent and therefore the signaling impulses hardly penetrate to the input of the receiver 18.

This makes it possible to reduce the range of frequencies used, since it is possible to choose the frequency of the radio signaling pulses that is close to or even coincides with the frequency of the radio pulses of KP selection and control. In addition, it is also possible to reduce the requirements for the selectivity of the filters of the receiver 18, i.e. to simplify the filters.

In the primary windings, i.e., the wires of communication line 10 of transformer 13, common-mode EMF of signaling pulses are induced. These lines are connected in parallel to the secondary winding of the transmitting transformer 9. To isolate these pulses, a receiving transformer 11 is used, the input winding of which is also connected to the primary winding of the three-rod transformer 13, which is output in relation to the windings 19 and 20.

With this switching on of the transformer And the lero secondary winding receives neither the supply voltage nor the selection signals of the gearbox and control objects from the transmitting transformer 9 to the wires of the communication line 10.

Thus, the path between transmitted and received signals is also performed here.

Signaling pulses received at the receiving transformer 11 are fed to the input of the receiver 12, where they are extracted, amplified, detected, and in the form of video pulses are fed to the control, signaling and control unit 7, where they are used to generate object state indication signals.

Since the input of the selector, objects and control is not received at the input of the receiver 12, and the supply voltage is not received, the requirements for the selectivity of the filters are lowered, which allows them to be simplified.

Connecting the transformer 9 is not to the wires of the communication line 5, but to the wires of the line

In connection 10 in cint3iiib, the amount of supply voltage applied to the secondary winding of the transformer 9.

The voltage of the selection signals KP and control objects is also induced on the winding of the power 14, however, it is filtered by the power supply 15.

Thus, as a result of the described connection of the transmitting and receiving transformers 9 and I to the wires of the communication line 10 and the corresponding connection of the windings 16 and 17 in the three-rod transformers 13, as well as using the parametric transformer of the power supply 3 to supply energy to the wires of the communication line 5 simplifying the proposed device (by simplifying the filters), increasing the noise immunity and reducing the range of frequencies used.

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Claims (2)

1. Authors certificate of the USSR 247371, M. Kl.2 G 08S 19/28, 1968. 2. USSR author's certificate jV 462199, M. Kl.2 GOSC 19/28, 1973. n n 22