SU1660159A1 - Multichannel switch with switchable standby - Google Patents

Description

The invention relates to electronic engineering; ·, Can be used in switching and control devices of various

and electronic units telemehani ⁰ iCal systems. The purpose of the invention is to increase reliability. The device contains N channels 1 switching and block 4 protection. Ν-1 blocks are inserted into the device.

4 protection. N keys 5 and 6, pulse transformers 7 and 8, shapers 9 and 10 of the logic level, element OR 11, Kz-trigger 12, adder 13 modulo two, one-vibrator 14, element 15, integrator 16, Schmitt trigger 17, counter 18, decoder 19, the display element 20. The goal is achieved by automatically switching to a backup protection unit in case of a failed unit. 1 il.

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1660159 A1

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The invention relates to electronic switching technology and can be used to create switching devices and

control of various blocks of electronic and telemechanical systems.

The purpose of the invention is to increase reliability.

The drawing shows a schematic diagram of a multi-channel switch with switchable reserve.

The switch contains N switching channels 1, control bus 2, output bus 3, N protection blocks 4, N first keys 5, N second keys 6, first and second pulse transformers 7 and 8, first and second logic drivers 9 and 10, the OR level 11, 85 flip-flop 12, adder 13 modulo two, one-shot 14, element 15, integrator 16, Schmitt trigger 17, counter 18, decoder 19, display element 20, and N diodes 21.

The outputs of the N switching channels 1 are connected to the output bus 3, the control inputs of the N channels 1 are connected to the control bus 2, the common control output of the N channels is connected to the combined first terminals of the N protection blocks 4.

The control inputs of the first 5 and second 6 of each of the N keys are pairwise combined and connected to the corresponding N outputs of the decoder 19, (Ν + 1) -ή whose output is connected to the display element 20.

The inputs N of the first 5 and N second 6 keys are connected respectively to the first 22 and second 23 power supplies, the outputs N of the first 5 and N second 6 keys are connected respectively to the second and third terminals N of the 4 protection blocks, the fourth terminals N of the 4 protection blocks are combined and through the primary winding of the first pulse transformer 7 is connected to the common control output of N channels. 1 switching, the power bus of which through the primary winding of the second pulse transformer 8 is connected to the fifth terminals of the N protection units 4 connected via N diodes 21, the outputs of the N switching channels 1 are connected respectively to the inputs of the OR element 11, the output of which is connected to the 8-input of the 85 flip-flop 12, the first input of the adder 13 modulo two and the input of the one-shot 14, the output of which is connected to the first input of the integrator 16, the output of which through the Schmitt trigger 17 is connected to the counting input of the counter 18, the outputs of which are connected to the inputs of the decoder 19 , 5-input 85-flip-flop 12 through the first shaper 9 of the logic level is connected to the secondary winding of the transformer 7, the secondary winding

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transformer 8 through the second driver 10 is connected to the second input of the adder 13, the output of which and the inverse output 85 of the flip-flop 12 are connected to the corresponding first and second inputs of the element 15, the output of which is connected to the second input of the integrator 16.

The keys 5 and 6 allow you to connect (or disconnect) the power sources 22 and 23 to the protection unit 4,

The inclusion of the primary windings of the first and second transformers 7 and 8 in the control signal passing circuit and in the power supply circuit of the switching channels 1 allows you to monitor the presence of signals in the specified circuits and further logical processing of the state of the switch.

Single-oscillator 14 is started by the decay of the signal from the output of the element OR 11 and its output signal, ohm, reset the integrator 16.

The Schmitt trigger 17 generates a logic level signal at its output when the input signal reaches a certain (threshold) level.

The counter 18 changes the binary code at its outputs with the arrival of each pulse from the output of the Schmitt trigger 17. After turning on the power, the counter 18 is set to the initial (zero) state by the initial setting signal applied to the input (the initial installation diagram is not shown).

Multichannel switch works as follows.

In the initial state, there are no signals on the control and output buses 2 and 3 of the switching channel 1, the 85-flip-flop 12. is in the zero state, and a logical unit signal is present at its inverse output. The integrator 16 is reset, zero binary code is present at the outputs of counter 18, the first output of the decoder 19 contains a logical unit signal that opens the first and second keys 5 and 6, connecting the first and second sources 22 and 23 of the power supply to the second and third terminals of the first block 4 protection.

The appearance of the input signal on the control bus 2 switching channels 1 causes the connection of the bus of the second power source 23 through key 6, protection unit 4 and the primary winding of the pulse transformer 8‘ to the power bus of switching channels 1. On the output bus 3, the output of the switch appears for a period of time determined by the duration of the control signal. In this case, at the first and second inputs of the adder 13 there are levels of logical units from the outputs of the element 14LI ’

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11 and the driver 10, and the output is a logic level of zero, which closes the element And 15. As a result, the integrator 16 remains in the same (zero) state, the state and other elements of the switch does not change. The end of the input signal on the control bus 2 leads to the appearance of a logical zero level at the inputs of the adder 13, which is also stored at its output, the state of the switch elements also does not change.

Suppose that one of the elements of the first protection block 4 has failed. Then, when an input signal appears on the control bus 2 in the circuit containing the primary winding of the transformer 8, a signal does not appear because the power supply source 23 has not connected to the switching power supply ^ switching network. At the first input of the adder 13 remains the signal of a logical zero, which leads to the appearance at the outputs of the adder 13 and the element And 15 level logical units. The integrator 16 begins to integrate the incoming logical unit level. When a certain (threshold) level is reached by the output signal of the integrator 16, Schmitt's trigger 17 switches to one state, by the front of its output signal switching the counter 18 to the next state. The signal of the logical unit at the same time appears on the second output of the decoder 19, opening the keys 5 and 6 of the second (next) protection block 4 and closing the keys 5 and 6 of the first (previous) protection block 4, failed. The power source 23 through the key 6, the connected serviceable protection unit 4 and the primary winding of the pulse transformer 8 is connected to the power bus of the switching channels 1. At the same time on both inputs of the adder 13 is set to a logic level of zero and the element 15 is closed. An output signal appears on the output bus 3 of the switch. At the end of the input control signal, the one-shot 14 starts, setting the integrator 16 to the zero state. The multi-channel switch is again ready for operation, now with backup unit 4 protection.

If the nature of the malfunction of the protection unit 4 is such that the power source 23 is connected to the power bus of the switching channels 1 in the absence of a control signal (short circuit in the protection unit), then in this case the output of the adder 13 is the level of the logical unit, which leads to the counter switching 18 and the subsequent switching to the backup unit 4 protection.

If the switching channels 1 are overloaded by current, the short-circuit protection unit 4 is activated, disconnecting the power supply 23 from the switching power supply bus during the action of the control signal.

At the same time, a false switch to the backup protection unit does not occur, because when the flow is overloaded, a current pulse (the duration of which is equal to the response time of the protection unit 4) occurs at the control output of the switching channels 1, the amplitude of which exceeds the logic level at the output of the logic driver 9 logical unit. This pulse switches the PZ-flip-flop 12 to one state, while the zero signal from the inverse output of the flip-flop 12 closes the element 15, which does not integrate the integrator 16 signal of the logical unit at the output of the adder 13. At the end of the switch input signal, its decay switches the trigger 12 in the original state. The switch is again ready for operation.

When the entire available reserve (Ν) is exhausted, the next failure results in the appearance of a logical unit signal at the (Ν + 1) -μ output of the decoder 19 and the triggering of the display element 20, which may be a signal to the maintenance personnel about the need for repairs or the replacement of this unit.

Thus, in case of failures of the redundant protection unit (the power supply remains connected if there is no input control signal or the power supply is not connected when an input control signal appears), the switch to the backup protection unit is automatically switched on, and the switch output signal is interrupted only for a time equal to backup unit This increases the reliability of the multi-channel switch, since its operation is not affected by the failure of one of the elements of the protection unit.

Compared to the known, the proposed multi-channel switch has increased reliability due to automatic switching to a backup protection unit when a working unit fails, provides automatic switching to a backup unit for various types of failures of a redundant unit (open circuit or short circuit) and the η-fold redundancy without change automatic switching circuit eliminates false switching of the backup unit when triggered

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protection unit during channel overload. current switching, and also indicates a malfunction when the available

reserve.

Claims (1)

A multichannel switch with switchable reserve, containing N switching channels and a protection unit, the first output of which is connected to a common control bus of N switching channels, the control inputs of which are connected to the control bus, and the outputs to the output bus, characterized in that increase the reliability of operation, introduced the element OR, one-shot, integrator, Schmidt trigger, counter, decoder, N diodes, Ν-1 blocks of protection, N first keys, N second keys, first and second pulse transformers, first and second logic level rmirovateli, KZtrigger adder modulo two. The element And and the display element, the first terminals Ν-1 of the protection units are combined and connected to the common control bus of the N switching channels, the control inputs of the first and second of each N keys are pairwise combined and connected to the corresponding N outputs of the decoder, (+ 1) - whose output is connected to the display element, the inputs of the N first and N second keys are connected respectively to the first and second power sources, the outputs N the first and N second keys are connected respectively with the second and third pins of the N protection blocks, the fourth pins of the N protection blocks are combined through the primary 5 the winding of the first pulse transformer is connected to the common control output of N switching channels, the power bus of which through the primary winding of the second pulse transformer is connected to the fifth terminals of the N protection blocks connected through N diodes, the outputs of the N switching channels are connected respectively to the inputs of the OR element, the output of which connected to the K-input of the KZ-trigger, ι the first input of the modulo two adder and the input of the one-shot, the output of which is connected to the first input of the integrator, the output of which through the Schmidt trigger connect inn with the counter input of the counter, the outputs of which ι are connected to the inputs of the decoder, the 5-input short-circuit trigger through the first shaper of the logical level is connected to the secondary winding of the first pulse transformer, the secondary winding of the second> pulse transformer through the second - shaper of the logic level is connected to the second input adder modulo two, the output of which and inverse output K5 three; Gera is connected to the corresponding I first and second inputs of the element I, the output of which is connected to the second input of the integrator.