SU739537A1 - Device for majority selection of signals - Google Patents

Description

(54) DEVICE FOR THE MAJORITY CHOICE OF SIGNALS

The invention relates to the field of automation and computer technology and is intended for use in computing and control systems with redundancy. Devices for the majority selection of signals are known; The closest to the technical essence of the invention is a device for the majority sampling of signals 2, containing a comparator, the first input of each of the KOTOE & JX is connected to the output of the majority elmenerg, the second input with the corresponding input and information input of the devices and the output with the corresponding input the input of the indicator, and the switching element, the first and second inputs of each of which are connected to the second input and the course of the corresponding comparator, and the outputs to the inputs of the majority element. Such devices do not allow sampling from the reserved channels of signals of only a potential type. . The distinction of the described device is that it contains the OR elements and the strobe selection unit, the inputs of which are connected to the information and clock inputs of the device, and the output to the third inputs of the comparators, the outputs of the OR elements are connected to the third input of one switching element, and the input to To the first inputs of others I switch. elements. These allow to expand the field of application and increase the reliability of the device. The structure of the device is shown in the drawing. The device contains redundant channels 1-3, majority element 4, comparators 5-7, indicator 8, switching elements 9-11, elements OR 12-14, strobe release unit 15. Redundant channels have inf1 inputs 16-18 and clock inputs 19-21, which are respectively the information and tact inputs of the device. The device works as follows.

When all channels 1–3 are intact, the signals at their information outputs are identical, so the 5–7 comparators work, and at their outputs signals corresponding to the zero level are present. . These signals / inputs to the control inputs of the switching elements 9-11 permit the passage of information from the inputs 16-18 to the corresponding inputs through the majority of elements 4, so that reliable information is output at its output. At the same time, the information from the outputs 16-18 of channels 1-3 goes to the first three inputs of the selection unit of the gate 15, the other three inputs of which receive clocks from the outputs 19-2 (these pulses are present on them only if there are information signals on the corresponding outputs 16 -18 channels 1-3),

Block 15 produces gating

impulses in the presence of information and clock signals from eto inputs from at least one redundant channel. In order to prevent comparators from forming 5-7 spurious signals caused by non-simultaneous delivery of s17Ials from the outputs of channels 1-3 and mezhoritarny element 4 to their corresponding inputs, unit 15 generates pulses for interrogation of comparators 5-7 with a certain delay by writing compression signals . At the same time, if at the corresponding inputs of the commutators 5-7 there are identical levels of D signal, then they do not work, which means. testifies to the equal channels 1-3. If there are no dooText inputs of one of the indicated: higher blocks 5–7, there are non-ideal signal levels, then when it arrives at its interrogation input of a building pulse, it triggers,. which indicates a malfunction of one of the channels 1-3. It should be noted that each of the comparators includes a fixation element, the channel conditions, - -.

In the absence of information and the occurrence of the on-information inputs 16-18 of the interference, the allocation unit of the gate 15 does not burst, since its inputs -jB do not have clock pulses, and therefore false disconnection of channels 1-3 is not performed. So, if during the transfer of information one of channels 1-3, for example, channel 1, is faulty, a comparator 5 is triggered and a single ypOEseHb signal appears on its output, which goes to indicator 8 for length

signaling a faulty channel and to the control input of the switching element 9. At the same time,

passing information from the output of the faulty channel 1 through the switching element 9 and allowing the information present at the output of the element OR 12 to pass through the switching element 9 to the co-input of the majority element 4, Thus, to all of the majority inputs. . Element 4 contains signals, and at its output there is still reliable information. When a channel eiqe fails, for example, channel 2, information from output 18 of healthy channel 3 passes through switching element 11, the OR element 12 and switching element 9 correspond to the two inputs of the majority element 4, as a result of which its output state changes according to relevant information. Consequently, at the information inputs of the comparator, corresponding to the faulty second channel, the signals have a non-identical level, as a result of which, on arrival of a strobe pulse from block 15, it is triggered. At the output of the comparator 6, a unit level appears, which is fed to the indicator 8 to signal an H1 faulty channel and to the control input of the switching element 10. At the same time, the passage of information from the output 17 of the faulty channel 2 through the switching element 10 is blocked and at the output of the element IL 13, through the switching element 10 n corresponding. the input of the majority element 4,

Thus, in case of successive failure of any two channels at the output of the majority element 4, we have information which, with a probability of 0.5, can be considered information corresponding to the healthy channel, since if the information diverges in two channels, it is impossible to determine which of them is faulty.

In the proposed device, failures of the channels being reserved do not lead to a decrease in the reliability of the redundant device.

Claims (2)

1. Copyright certificate USSR; No. 565298, cl. G 06 R 11/00, 11.04.75 - 2. USSR author's certificate No. 335688, cl. G 06 R 11/00, OU06JO (prototype) ..