SU616719A1 - Arrangement for majority selecting of signals - Google Patents

Description

The invention relates to computing and automation and can be used to build systems of increased reliability.

A device for the majority selection of three input signals is known, which contains AND elements and OR elements ij. However, this device does not allow a transition from a permanent reservation to a replacement reservation, since when the power is removed from the elements providing redundant paths to the input signals, the entire device will not function. For the same reason, the device does not provide control of the health of the component elements without additional control units.

The closest technical solution to the invention is a device for the majority selection of signals, containing three majority blocks, the first input of each of which is connected to the output of the corresponding signal source, the second input to the output of the previous majority block J2. This device does not ensure the operability of the redundant system in case of failure of any element. The aim of the invention is to increase Reliability to the widening of the field of application of the device.

This is achieved by the fact that in the device OLA of the major signal selection the third input of each major block A is connected to the output of the corresponding previous signal source, and the fourth input is connected to the output of the corresponding next signal source, and also that each major block contains AND and OR elements, moreover, the first and second inputs of the peri element And are connected to the second and third inputs of the major block, and the output is connected to the first input of the OR element, and the second inputs of the second element And are connected to the fourth input of the ma the primary block, and the output with the second input of the OR element, the output of which is connected to the output of the majority block.

FIG. 1 shows the block diagram of the device; FIG. 2 is a specific implementation of the device, performed on elements of transistor-transistor logic.

The proposed device contains three major block 1, .2 and 3, the first input of each of which is connected to the output of the corresponding signal source 4, 5 and 6, the second input is connected to the output of the previous major block 3, 1 and 2, the third input of each majority block 1 , 2 and 3 - with the output of the corresponding previous signal sources 6, 4 and 5, and the fourth input - with the output of the corresponding subsequent signal source 5, 6 and 4. The first and second inputs of the first element And 7, 8 and 9 of each majority block 1, 2 and 3 are connected to the second and third inputs the primary block, the output - with the first care of the OR 10, 11 and 12 element, the First and the second inputs of the second element AND 13, 14 and 15 of each major block 1, 2 and 3 are connected to the first and fourth inputs of the majority block, and the output - with the second input of the element OR 10, 11 and 12.

FIG. 2 majority blocks 1–3 are made on AND-OR-NOT and AND-NO elements and are included in the feedback circuits of the corresponding backup triggers 4-6, built on the AND-NE elements with counting inputs 7-9 and outputs 1012. Through pins 13-15, the feedback of the 4-6 triggers from the outputs 1O-12 through the majority blocks 1-3 is closed. In this case, the signal from the output lO of the backup trigger 4 is fed to the pins of 16-18 majority blocks 1-3 (the first, third and fourth inputs, respectively, of the majority blocks), the output signal 11 of the backup trigger 5 goes to the pins of 19-21 majority blocks 1-3 {the fourth, the first to the third inputs, respectively, of the majority blocks), the signal from the output 12 of the backup trigger 6 goes to the terminals 22-24 of the majority blocks 1-3 (the third, fourth and third and first inputs, respectively, of the majority blocks) . The signals from the outputs 25, 26, 27 majority blocks 1-3 are fed to the inputs of the subsequent redundant device 28 ,. to pins 1315 of backup triggers 4-6, closure feedback, and to pins 29-31 of majoritarian blocks 1-3 (second inputs of the majority blocks). Signals to inputs 7-9 come from the previous redundant device 32.

The principle of operation of the device is as follows. The major unit blocks of the device are connected between the signal sources, which are the outputs of the backup channels of a device and the inputs of a subsequent redundant device, while providing redundant paths to the input signals, which allows the entire redundant system to remain operable if one of the elements fails. In addition, the connection of the majority units and, accordingly, the backup channels of the previous and subsequent redundant devices to the power source, independent of each other, allows to ensure the transition from permanent redundancy to replacement redundancy and the possibility of monitoring the health of individual elements of the redundant system.

In the proposed embodiment (see Fig. 2) of making the device for a major signal choice, at any failure of any one element of the device or of the outputs of the previous redundant device 32 and the inputs of the subsequent redundant device 28, correct information is provided on at least two of the three outputs 25- 27, which is sufficient for proper functioning of the circuit as a whole.

The device works as follows. If any IS-Edema fails in any of the backup triggers 4-6, for example, in trigger 4 and with the tri-phase operation of triggers 5 and 6, the phase of the signals at the outputs d 25, 26, 27 / of the AND-OR-NOT elements the phase of the signals at the outputs 11 and 12 of the reserve triggers 5, 6, i.e. at least one pair of inputs AND each of the elements AND OR-NOT of the majority blocks 1-3 will be signals whose phase corresponds to the phase of the signals at the outputs 11 and 12 backup triggers 5 and 6.

If any element fails in any nz majority units, for example, an AND-OR-NOT major unit 1 element, the signals at the outputs 26, 27 in phase will correspond to the signals at the outputs 11, 12. reserve triggers 5, 6, since at least on one pair of inputs AND of the AND-OR-KE elements of the majority blocks 2, 3 there will be coincident signals, the phase of which is determined by the phase of the signals on the inputs 11, 12 of the reserve triggers 5, 6.

Any failure of the outputs of the previous one or the inputs of the subsequent redundant device can be interfered with. PiLL

as a failure of the backup trigger, or as a failure of one of the majority units, while ensuring that the correct information is available on at least two of the three outputs 25, 26, 27.

By separately connecting the voltage of the power sources to the backup devices, the health of the constituent elements of the 93 additional control devices and the on-the-fly transition from a permanent backup to replacement redundancy is provided by switching one or two of the three backup channels to the power source. At the same time, the normal operation of the switched on channels is ensured by the fact that the signals at the outputs of the disconnected channels are equivalent to the enabling levels.

For example, when the first backup channel is connected to the power source, the operability of the AND-NOT and AND-OR-NOT elements included in the majority block 1 is monitored by ensuring that the system as a whole functions correctly, including the corresponding channels of the preceding 32 and subsequent 28 reserved channels. devices.

If any element of the first backup channel fails, a cold reserve is used by connecting the second or third backup channel. When all three backup channels are connected, a hot spare is used.

Thus, the proposed device provides the same functions as the prototype, with a significant simplification of the device, and also provides additional operability in the event of a single failure of any element and the possibility of a rapid transition from redundancy to permanent replacement.

The technical and economic effect of using the invention depends on the field of application of the system in which the invention is used, and consists in preventing the occurrence of failures and downtime due to the repair of individual units.

Claims (2)

1. A device for the majority choice of signals, containing three majority blocks, the first input of each of which is connected to the output of the corresponding signal source, the second input to the output of the previous majority block, characterized in that, in order to increase the reliability and extend the field of application of the device, the third the input of each major block is connected to the output of the corresponding previous signal signal, and the fourth input is connected to the output of the corresponding subsequent signal. 2. The device according to claim 1, of which is that each major block contains elements of AND and OR, the first and second inputs of the first element AND are connected to the second and third inputs of the majority block, and the output - with the first input of the element OR, the first and second inputs of the second element AND are connected to the first and fourth inputs of the majority block, and the output - to the second input of the OR element, the output of which is connected to the output of the majority block. Sources of information taken into account in the examination 1. US Patent N 3524О73, cl. ZO7-211, 11.08.70. 2. USSR author's certificate NO 247622, M.C. GI 06 F 11 / GS, 28.12.67. fPu8.1