SU1608667A1 - Three-channel redundancy device - Google Patents

Abstract

The invention relates to automation and computing and can be used in the construction of highly reliable redundant devices. The purpose of the invention is to increase the reliability of a three-channel redundant device by maintaining its operability when the power is turned off in one of the two channels. The goal is achieved by introducing into each channel a three-channel redundant device containing in each channel a redundant unit 4 and a major element 5, an element OR 6, a communication resistor 7 and a voltage divider 8 with corresponding connections. The device provides reliable output of information signals in case of disconnecting the supply voltage in any one of the three channels, and in case of disconnection of the voltage in any two channels, the device automatically switches to single-channel operation with outputting information signals to the output of the remaining switched on channel. In addition, the device speed increases due to the reduction of logical elements NOT in the signal path from the reserved blocks 4 to the inputs of the majority elements 5. 3 Il.

Description

The invention relates to automatic computers and can be used in the construction of redundant backup devices. The purpose of the invention is the increased reliability of a three-channel reserving device by maintaining operability at from. This goal is achieved by introducing into each channel a three-channel redundant device containing in each channel a redundant unit 4 and a majority element 5, an OR element 6, a communication resistor 7 and a voltage divider 8 with corresponding connections. The device provides reliable issuance of information signals in the event of a disconnection of the supply voltage in any one of the three channels, and in the event of a voltage disconnection in any two channels, the device automatically switches to a single-channel operation mode with the output of information signals to the output of the remaining on channel. In addition, increases the performance of the device due to the reduction of logical elements NOT in the signal path from the reserved units 4 to the inputs of the majority elements 5. 3 ill.

FIG. one

SU., „1608667

The invention relates to automation and computer technology and can be used in the construction of highly reliable redundant devices.

The purpose of the invention is to increase reliability by maintaining the operability of the device when the power is turned off in one or two channels.

Figure 1 presents a block diagram of a three-channel redundant device; figure 2 - majority element with a control input; Fig. 3 voltage divider.

The device contains channels 1-3, redundant blocks 4, majority elements 5, OR elements 6, communication resistor 7, voltage divider 8, channel power bus 9, information inputs 10-12 of the majority element, control input 13 of the majority element, channel output 14 and resistors 15.

The device operates as follows.

When applying voltage to the channels 1-3 of the device at the outputs of the voltage dividers 8, potentials corresponding to the level of a logical unit are established. At the outputs of the OR elements 6, signals appear that are fed to the control inputs of 13 majority elements 5 and ensure their operation in the original majority mode (generating the output signal according to the principle of most of the signals fed to the information inputs 10-12).

The reserved blocks 4 form the output signals in negative logic, i.e. the absence of an information signal corresponds to a high level at the output of the block, and the presence of an information signal corresponds to a low level at the output of the block.

Under normal power supply of the three channels, the usual majority processing of the output signals of blocks 4 is carried out, while the output signal of each channel is inverted by the majority element 5 to positive logic (Fig. 2).

When the supply voltage is disconnected in one of the device’s channels, for example, in channel 1, through a communication resistor 7 connected in channel 2 between the power bus 9 and the output of the reserved unit 4 of the disconnected channel, at inputs 12 and 11 of the majority elements 5, respectively, in channels 2 and 3, in which there is power, a high level of the signal will be maintained. Due to this, the majority elements 5 for low-level signals arriving at their information inputs from the outputs of the included redundant blocks 4 (channels 2 and 3) will work similarly lementu NOR, ie, positive information signals at the outputs of 14 controlled majority elements 5 in channels 2 and 3 will be generated only when the negative signals from the outputs of the reserved blocks 4 coincide at their information inputs. Thus, false signals are output to the outputs of the enabled channels of the device in the event of accidental failures of one of two enabled serviceable channels.

Similarly, the device operates in the event of a power failure in one of any two other channels.

In case of disconnection of the supply voltage in two channels, for example, in channels 1 and 2, the device will switch to a single-channel mode of operation of channel 3. In this case, the information signals at the output of a working channel 3 will be determined by the signals coming from the output of the reserved unit 4 of this channel.

The device is switched to single-channel mode by two low-level signals coming from the outputs of the voltage dividers 8 of the switched off channels 1 and 2 to the inputs of the OR element 6 in channel 3 with the power on. As a result, the low potential is generated at the output of this OR element 6, which puts the controlled majority element 5 of channel 3 into inverter mode for signals arriving at its information input 10. At the same time, input 12 will maintain a high signal level due to the communication resistor 7 connected to the power bus 9 in the same channel.

In the event of a disconnection of the supply voltage in channels 1 and 3 or in channels 2 and 3, the device will go into single-channel operation mode of the remaining switched on channel as described.

Thus, the device provides reliable output of information signals in the event of a power outage in any one of the three channels of the channels, it goes into single-channel operation mode, and in case of disconnection of the voltage in any two, the caustor will automatically send information signals to! output 14 of the remaining on channel, which ensures increased reliability of its operation. In addition, in comparison with the prototype, the device’s speed increased due to the reduction of logical elements NOT in the signal path from the reserved units 4 to the inputs of the majority elements.

Claims (1)

A three-channel redundant device containing a redundant block and a majority element in each channel, the output of which is the channel output, different m, which, in order to increase the reliability of the device by maintaining its operability when the power is turned off in one or two channels, are introduced into each channel of the device OR element 5, a communication resistor and a voltage divider connected to the first output terminal of the channel to which the first output of the communication resistor is connected, the output of the OR element in each channel is connected to the control input of the majority element, the output of the reserved unit is connected to the first information input of the majority element of this channel and with one of the other information inputs of the majority elements of adjacent channels, the second output of the communication resistor is connected to the output of the redundant 20 of the previous block of the previous channel, the output of the voltage divider of this channel is connected to one of the two inputs of the OR elements of the other channels, and the second input terminal of the voltage divider 25 of each channel is connected to the zero potential bus.