SU1256242A1 - Device for checking unit for switching a.c.signals - Google Patents

Abstract

The invention relates to telecommunications. The reliability of the control and the accuracy of the signal transmission increases. The device contains a switch 1 consisting of key elements 2 and a control unit 3 made of a decoder 4 and inverters 5, common and channel capacitors 6 and 9, common and channel resistors 7 and 12, switch 8, zener diodes 10 and 11, signal conditioners (FS) 13, elements AND 14, elements OR 15 and 17, a pilot signal sensor (DCS) 16, an inverter 18 and a coincidence element (ES) 19, as well as an AC signal meter 20 and AC sources 21. The presence of two inputs of the ES 19 single signals from the inverter 18 and the element OR 15,. causes the occurrence on his i w to

Description

1256242

the output of the potential of an intact state - bilitrons 10 and 11, FS 13, elements of switch 1. The goal is reached by AND 14, elements OR 15 and 17, DKS 16, by the introduction of capacitors 6 and 9, by the inverter 18 and ES 19. 1 .

The invention relates to telecommunications and can be used in multi-channel automated control systems that require switching of alternating current electrical signals.

The purpose of the invention is to increase the reliability of control and accuracy of signal transmission.

The drawing shows a structure-wiring diagram, a device for controlling an AC signal switch.

The device contains a switch 1, which includes key elements 2 and a control unit 3 consisting of a decoder 4 and inverters 5, common capacitor 6, common resistor 7, key 8 channel capacitors 9, first 10 and second 11 zener diodes. Channel resistors 12, drivers 13 signals, the elements AND 14j, the first element OR 15, the pilot signal sensor 16, the second element OR 17, the inverter 18, the coincidence element 19, the AC signal meter 20 and the AC signal sources 21.

The device works in the following way.

When the channel code (key element) of the switch 1 arrives, for example, from the autocontrol system (shown in the diagram), the decoder 4 is outputted from its outputs. A signal is given to the closure of the key element 2 of the selected channel, and from the inverted outputs of the control unit 3 (from inverters five). enable signals (unit potentials) are received at the second inputs of the AND 14 elements of the unselected channel and the forbidden signal (zero potential) to the second input of the AND 14 element of the selected channel of the switch 1. At the same time, the potential is applied to the closure of the key 8.

If the key element 2 of the selected channel is closed, and the key elements of the other 2 channels are open, which corresponds to the correct operation of switch 1, the DC voltage from the sensor 16 of the control signal through the closed key 8, the common resistor 7 and the closed key element 2 of the selected channel on the zener diodes 10 and 11 of this channel, they will be unlocked, since the voltage of the unlocking of the zener diodes 10 and 11 is chosen greater than the maximum amplitude of the input signals of the alternating current sources 21. The counter-switching of the zener diodes 10 and 11 prevents the passage of both a positive and a negative half-wave signal to the body (common wire). Therefore, in the original connection. Then, one of the Zener diodes 10 or 11 is locked and represents a significant resistance for the input signals. After unlocking the Zener diodes 10 and 11, a signal is received on the channel resistor 12 of the selected channel relative to the housing, and there are no signals on the similar channel resistors of the 12 other channels connected to opening the key elements 2.

The resistance of the common resistor 7 prevents the short-circuit of the input AC signal from the source 21 to the housing through the closed key element 2 of the selected channel, the key 8 and the sensor 16.

The presence of a signal on the channel resistor 12 of the selected channel and its absence on the channel resistors 12 unselected channels determines the condition of the healthy state of the switch 1. In this case, the output of the signal generator 13 of the selected channel shows the potential that goes to the first input of the And 14 element of this channel and the input, and then the output of the first element OR 15. Since

On all elements of AND 14, the resolving potential exists only on one of the two inputs (on the element 14 of the selected channel — from the driver 13 of this channel; and on the elements 14 of the unselected channels from inverters. 5, i.e. from the inverse outputs of block 3 control), there will be no signals on their codes and the inputs of the second element OR 17 associated with them. The arrival of the output zero potential of the element OR 17 at the input of the inverter 18 leads to the appearance of a single signal at its output; The presence of two signals on the two inputs of the element 19 (from the inverter 18 and the first element OR 15) causes the potential at the output of the operating state of the switch 1

When this signal arrives at the autocontrol system, the potential is removed from the circuit bus of the switch 8, as a result of which the latter is locked, and the constant voltage is removed from its output. The next moment, the potential is applied to the bus to start the conversion of the meter 20 and the measurement of the AC signal, the source 21 of the selected channel. In ka1

The meter 20 serves as either an analog-to-digital converter of alternating current signals, or a frequency converter — a code when the input alternating signal carries frequency information.

Switch 1 is in a faulty state in the following possible cases: the key element 2 of the selected channel is not closed, the key elements of the 2 unselected channels are open; key element 2 of the selected channel is closed, one or more of the key elements of the 2 unselected channels are closed; key element 2

The selected channel is not closed, one code bus of the decoder 4), indications or more of the key elements / unselected channels are closed.

In the first case, there will be no signal at the output of the imager 13 of the selected channel, it will not go to the first one. element SHSh 15, there will be no resolving potential on. one of the two inputs of the element 19 is a match and did not operate in a healthy state at its output. In the second case, the signals in the channel resistors are 12 unselected channels, in which the key elements are falsely closed

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good condition (control from element 19) and indication of the state of the key elements of 2 channels (control from the driver buses 13) Then, in the absence of the indicator light of the good condition, the selected channel is determined by the channel indication and the faulty channels are found by the status indication (the absence of luminescence of the indicator element of the selected channel will indicate the failure of its key element, the luminescence of the indicator elements

2, in ts signals at the outputs

j 5

0 5

0

five

0

drivers 13, and potentials from elements AND 14 of these channels (two inputs of these elements 14 have resolving signals: on one from drivers 13, on others from inverters 5) go to the second element SH 17, and then to inver. the torus 18, the zero potential from the output of which will prohibit the passage of the signal through the element 19 coincidence. In the third case, as in the second, the appearance of a signal, at the input of the second. the element OR 17 will lead to the emergence of a zero potential at the output of the inverter 18 and to prohibit the occurrence of a signal of a working condition from the output of the element 19 coincidence.

In the absence of a single potential at the output of element 19, the autocontrol system detects the faulty state of switch 1 and, after polling the outputs of the formers 13 (state buses), finds the faulty channels (based on certain signals from the formers 13: from the uninterrupted key element 2 of the selected channel - zero potential, from falsely triggered key elements of 2 unselected channels - a single potential).

Determining the state of switch 1 is also possible in the autonomous mode (when switch 1 is operating without an autocontrol system) by supplying the corresponding potentials to the decoder 4 code buses and the switch 8 key bus, which has DC voltage at its input, and viewing the potentials at the driver outputs. 13 and element 19. For convenience in offline operation, you can also enter an indication of selected channels (control of indication from

good condition (control e. from element 19) and indication of the state of the key elements of 2 channels (control from the driver buses 13). Then, in the absence of luminescence of the indicator element of the healthy state, the selected channel is determined by the channel indication and the faulty channels are found by the status indication (the absence of luminous indicator of the selected channel indicates that its key element is not working, the luminous indicator elements of the unselected channels will show falsely triggered key elements).

The absence of external galvanic communication between the channels and the auxiliary switches in the serial circuit of the key elements allows eliminating crosstalk and other instabilities.

The resulting resistance of the channel and common capacitors 9 and 6, included in the serial circuit of the electrical measuring paths according to the alternating signal, is an insignificant value (capacitors are chosen, based on the lower channel resistor, the second

its input frequency and signal frequency limits) and therefore practically does not introduce any additional error when passing the measured AC signal, since the input resistance of the meter 20 exceeds hundreds of kΩ.

Formulas and inventions

the output of which is connected to the common wire, through the signal conditioner is connected to the first input of the corresponding element of inc. corresponding to the 20 input of the first element OR, during which is connected to the second and the same element of the match, the second input and code of each element AND, respectively connected to the appropriate

The device for controlling the switch-25 inverse output of the control unit

An AC signal that includes key elements with a common output and a control unit with direct and inverse outputs, which contains a common resistor, CCUCH and channel resistors in the number of key switch elements, so as to increase the reliability control and accuracy of signal transmission, the general editor of N. Dankulich was entered into it. Order 4838/59

Compiled by V. Slepakov

Tehred M. Khodanich Proofreader T. Kolb

Circulation 624 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 1130355 Moscow, Zh-35, Raushsk nab. 4/5

Production and printing company, Uzhgorod, Projecto st., 4

.

1256242 I

sensor, pilot signal sensor, first OR element, second OR element connected in series, inverter and coincidence element, as well as AND elements, signal conditioners, channel capacitors and first and second zener diodes by the number of switch key elements, while the control sensor output a signal through a serially connected key and a common resistor is connected to the common output of key elements of the switch and to the first output of the common capacitor, the first output of which is connected to the common wire, h Res podk.shochen signal generator to the first input of the corresponding element present Inc corresponding input of the first OR gate, VY7 turn is connected to the second input of the coincidence element, and a second input of each of AND vkod respectively connected with the corresponding

switch and the corresponding input of the second element OR, the first output of each channel capacitor is connected to the individual output of the corresponding kltechevogo element of the switch directly and the first output of the corresponding channel resistor through successively opposite connected primary first and second zener diodes.

Claims (1)

Claim A device for controlling the switch 25 of AC signals, including key elements with a common output and a control unit with direct and inverse outputs, containing a common resistor, a key and channel resistors according to the number of key elements of the switch, characterized in that, with In order to increase the reliability of control and the accuracy of signal transmission, a common console, the first OR element, a sequence (; the second OR element, the inverter and the coincidence element, as well as the number of key elements of the switch - the elements , signal conditioners, channel capacitors and the first and second zener diodes, while the output of the control signal sensor through a series-connected key and a common resistor is connected to the common output of the key elements of the switch and to the first output of the common capacitor, the first output of each channel resistor, the second output of which is connected to a common wire, through a signal conditioner is connected to the first input of the corresponding AND element and to the corresponding input of the first OR element, the output of which is connected to the second ode of the coincidence element, the second input and output of each AND element are respectively connected to the corresponding inverse output of the switch control unit and the corresponding input of the second OR element, the first output of each channel capacitor is connected directly to the individual output of the corresponding switch key element and to the first output of the corresponding channel resistor through series-connected corresponding first and second zener diodes.