SU1133610A1 - Device for transmitting telemetry - Google Patents

Abstract

A DEVICE FOR TRANSMITTING TELECOMECHANICAL INFORMATION containing a differential amplifier whose output is connected to the input of a limiter and through series-connected first and second capacitors connected to the first input of a differential amplifier, the second and first resistors are connected in series and connected in parallel to the first and to the second capacitors, to the connection point of which the first terminal of the third resistor is connected, the second terminal of which is connected Res fourth resistor with zero potential bus, a third capacitor, the first vshod is connected to the point connecting the first and second resistors, a second terminal - a zero potential bus, the first switch, whose output is connected to a second terminal of the third resistor, the intermediate power, you are a. the stroke of which through a band-pass filter is connected to the input of the power amplifier, the output of which is the output of the device, the first input of which is the input of the first key, differs from the fact that, in order to increase the reliability of the transmitted (L information, the inverter, the second and the third keys, the fourth the capacitor, the null indicator, the element And and the trigger, the output of which is connected to the input of the intermediate amplifier, the inverter through the second key connected in series and the fourth capacitor with the third connected to the first plate the third Then the capacitor, the differential amplifier's output is connected via a null indicator to the first input of the element I, the output of which is connected to the trigger input, the output of the third key is connected to the second input of the element M, the input of the third key is the second input of the device.

Description

"eleven

The invention relates to the field of telemechanics, namely, devices for the transmission of telemechanical information, and can be used in industrial enterprises, in power engineering, in urban areas and in transport.

A device is known; CT of the transmission of telemechanical information in the tonal frequency range, which contains a serially connected modulator, a generator with a double T-shaped R C-bridge, a preliminary amplifier5 filter and an output amplifier lj „

The disadvantage of this transmitter is the low reliability of the transmission of telemechanical information associated with the occurrence of transients during frequency and amplitude manipulation, as well as the mutual influence of circuit elements. Transients reduce the duration of transmitted pulses, which, with an increase in the transmission rate, leads to distortion of the transmitted information. With frequency manipulation, the transmission ratio of the double T-shaped RC bfoCTa is lowered, as a result of which the amplitude of the signal at the generator output changes. At the upper frequencies of the tonal range, due to the influence of the output amplifier on the generator, frequency drift is possible, which leads to distortion of the transmitted information or even to a complete cessation of transmission,

The closest in technical essence to the present invention is a device for transmitting telemechanical information containing a differential amplifier, the output of which is connected to the input of the limiter and connected through the first and second capacitors connected in series to the first input of the differential amplifier, to the second input of which the limiter is connected. and the second resistors are connected in series and connected in parallel to the first and second capacitors, to the connection point of which are connected the first pin of the third resistor, the second pin of which is connected via. the fourth resistor with zero potential bus: a, the third capacitor, the first terminal of which is connected to the connection point of the first and second resistor.

10, 2

The second pin is connected to the zero potential bus, the first switch, the output of which is connected to the second output of the third resistor, the intermediate amplifier, the output of which is connected via a bandpass filter to the input of the power amplifier, the output of which is the output of the device, the first input of which is the input of the first switch. In order to equalize the amplitudes of the signals at the frequency shift of the pulse, an intermediate amplifier operating in the saturation mode 2j is used in this device,

However, in this mode, there are delays that reduce the duration of the transmitted pulses, which, with increasing transmission speed, leads to a decrease in the reliability of the transmitted information. To prevent. Possible frequency drift in the devices was carried out in a number of constructive measures: screening wires, carrying the power amplifier out of the unit, etc. However, for the upper frequencies of the tonal range, these measures are not enough.

The aim of the invention is to increase the reliability of the device: TWA.

;

The goal is achieved by the fact that the device for transmitting telemechanical information containing a differential amplifier., Whose output is connected to the guard input and connected through the first and second capacitors in series to the first input of the differential amplifier, to the second input to the limiter output, the first and second resistors are connected in series and connected in parallel to the first and second capacitors, to the connection point of which the first output of the third resistor is connected ora, the second terminal of which is connected via the fourth resistor to the zero potential bus, the third capacitor, the first terminal of which is connected to the connection point of the first and second resistors, and the secondary output to the zero potential bus, the first switch, the output of which is connected to the second output of the third resistor, is intermediate an amplifier whose output through a band-pass filter is connected to the input of a power amplifier, the output of which is the output of a device whose first input is a BKOHONJ

31

the first switch, an additional inverter, a second and a third switch, a fourth capacitor, a null indicator, an And element and a trigger, the code of which is connected to the input of the intermediate amplifier, an inverter through the second switch connected in series and the fourth capacitor connected to the first plate of the third capacitor, the differential output the null amplifier is connected to the first input of the element I, the output of which is connected to the trigger input, the output of the third key is connected to the second input of the element I, the input

The third key is the second input of the device.

The drawing is a schematic diagram of the device.

The device consists of a differential amplifier 1, the output of which is connected to the input of limiter 2 and through a double T-shaped PC-bridge 3, into which the series-connected capacitors 4 and 5 are connected, is connected to the inverting input of the differential amplifier. A limiter output is connected to the non-inverting input. The output of the resistor 6 is connected to the connection point of the capacitors 4 and 5, and its second output is connected via a parallel connection of the resistor 7 and the switch 8 to the zero potential bus. The control input of the key 8 is connected to the input 9 of the device’s frequency-frequency control. An input of a key 11 is connected to an input 9 via an inverter 10, the output of which is connected to a capacitor 12. Another terminal of a capacitor 12 is connected to a junction of the terminals of a capacitor 13 and resistors 14 and 15 of a double T-shaped bridge.

The output of the differential amplifier 1 is also connected to the input of a null indicator 16, the output of which is connected to one of the inputs of the element 17 and whose other input is connected via a switch 18 to another input 19 of the device, through which amplitude manipulation is carried out. The output element And 17 is connected to the input of the trigger 20, the output of which through an intermediate amplifier 21 is connected to a band-pass filter 22; A power amplifier 23 is connected to the output of the filter, the output 24 of which is the output of the device

The device works as follows.

104

In the differential amplifier 1 through the limiter 2 is carried out positive feedback, and

ABOUT

Double T-shaped RC-bridge 3 - is negative. It is excited at the frequency at which the transfer coefficient of the double T-shaped RC-bridge is zero and there is no negative feedback. The parameters of the RC bridge, and hence the generator frequency, are determined by the frequency key containing the resistor 7, the keys 8, 11, the inverter 10 and the capacitor 12.

If there is a 4M input potential at terminal 9, the key 8 is closed, the bridge leg resists but the sum of the resistances of the series-connected resistors 6 and 7. The key 11 is open through the inverter 10, this capacitor 12 is connected parallel to the capacitor 13. At the generator output there is a sinusoidal signal 2i. . Upon receipt of the opening potential at input 9, the key 8 opens and shunts the cut of the resistor 7. The resistance of the bridge leg is equal to the resistance of the resistor 6. The key 11 closes and disconnects the capacitor 12. The bridge leg capacitance equals the capacitor capacitance 13. The signal frequency at the generator output becomes equal to 21 -; If the condition of the zero balance is observed at that, the signal amplitude is 212 to the amplitude of the signal 2i,.

When a series of telemechanic pulses arrives at the input 9, a series of frequency-manipulated signals appears at the generator output. At the same time, the transfer process time is minimal, which allows to obtain high reliability of the transmission of telemechanical information at a high transmission rate.

From the output of the differential amplifier 1, a sinusoidal frequency-manipulated signal is fed to the input of a null indicator 16, which is converted into a sequence of rectangular pulses and fed to element 17. If there is an enable signal at the other input of the amplifier 17 from key 18 to trigger input 20 rectangular pulses arrive. When entering from the second input of the device 19 through the switch 18 to the element And 17 of the inhibiting potential, the pulses to the trigger do not pass. This is how amplitude manipulation is performed. In the case of amplitude manipulation of the effect on the master oscillator in known devices, the transients during generator excitation and generation failure disrupt the transmitted signals. In the proposed device, the generator operates continuously, there are no transients. It also increases the reliability of the transmission of telemechanical information. Trigger 205 switches, halves the frequency. At its output, there are frequency pulses with a frequency of i i ui, i ic ui, where 1 d is the average frequency of the channel. The rectangular pulses are amplified by the intermediate amplifier 21, and 22 of them use a band-pass filter to extract 106 sine-wave signals, which are amplified by the mono-output amplifier 23 and from the code of the device 24 enters the communication line. Since the output power amplifier and master oscillator operate with signals of different frequencies, the influence of the power amplifier on the generator is excluded. The prevention of frequency drift and stabilization of transients during frequency and amplitude manipulation significantly increases the reliability of the device and allows for high-speed transmission of telemechanical information. It also simplifies the design of the device. The device is mounted on a common board without the use of commanding screens and shielded wires. This reduces its cost and increases the efficiency of its use.

Claims (1)

DEVICE FOR TRANSMISSION OF TELEMECHANICAL INFORMATION, containing a differential amplifier, the output of which is connected to the input of the limiter and connected in series through the first and second capacitors to the first input of the differential amplifier, to the second input of which the output of the limiter is connected, the first and second resistors are connected in series and connected in parallel to the first and second capacitors, to the connection point of which the first output of the third resistor is connected, the second output of which is connected after h tverty resistor with zero potential bus, a third capacitor, a first terminal of which is connected to the junction point of the first and second resistors, a second terminal - a zero potential bus, the first switch, whose output is connected to a second terminal of the third resistor, the intermediate power, you are a. whose passage through a bandpass filter is connected to the input of a power amplifier, the output of which is the output of the device, the first input of which is the input of the first key, characterized in that, in order to increase the reliability of the transmitted information, an inverter, a second and a third the keys, the fourth capacitor, a zero indicator, the And element, and the trigger, the output of which is connected to the input of the intermediate amplifier, the inverter through the second key in series and the fourth capacitor connected to the first lining of the third con ensatora, vkod a differential amplifier through zero indicator connected to the first vhodu''elementa AND, whose output is connected to the input of the flip-flop, the output of the third switch Con whose second input to AND gate, the third key input is the second input device. 1133610 2