SU1077071A1 - Device for controlling redundancy channels - Google Patents

Abstract

A DEVICE FOR CONTROLLING THE SWITCHING OF BACKUP CHANNELS, containing the first elements AND, comparison blocks, the inputs of which are connected to the outputs of the input signal sources, and the signals - to the inputs of the first elements AND of their channel, characterized by the fact that, according to the number of backup channels, the delay elements, as well as the second elements AND in each row, the number of pins equals the number of the middle channel, with the output of each second element AND connected to the inverse inputs of the second element Tov and other channels in a row and through a delay element with an inverted input of a second AND element in its channel subsequent row. 8 Q., C.

Description

The invention relates to automation and can be used in automatic control and alarm systems that select the most reliable parameter. Devices are known for controlling the disconnection of backup channels, containing comparison units, inputs to which are connected to input sources, circuits, OR, whose inputs are connected to the outputs of comparison units D. . . However, these devices are characterized by insufficient reliability and limited scope. The device closest to the proposed technical entity is a device for controlling the switching of backup channels, containing elements 2I-OR and NOT and comparative blocks, whose inputs are connected to the outputs of the input signal sources. , and the outputs - with the inputs of the elements 2I-OR of their channel and through the inverter with the inputs 2I-OR of their own and other channels 2J. However, the known device is characterized by a lack of reliability, which is explained by the presence of a galvanic coupling between the backup links, and a limited scope, since it can only be used for a three-channel system. The purpose of the invention is to increase the reliability and expand the scope of application of the device. This goal is achieved in that the device for controlling the switching of backup channels, containing the first AND elements, comparison blocks whose inputs are connected, the outputs of the input signal sources, and the outputs to the inputs of the first AND elements of their channel, are entered according to the number of backup channels as well as the second elements AND in each row, the number of rows is equal to the number of the middle channel, and the output of each second element And is connected to the inverse inputs of the second elements And other channels in its row and through the element Lines with an inverse input of the second element AND of its channel in the subsequent row. In the proposed device, galvanic isolation between the channels is achieved, since only one channel signals are connected to the input of the time unit. Turning on the delay circuit eliminates the possibility of spurious signals at the output of the device. The drawing shows a diagram of the proposed device for the three channels,. The device contains blocks 1-3 comparing the first, second and third channels, respectively, elements AND 4-6 of the first row, elements AND 7-9 of the second row, outputs of sources, .. signals 10 and 11, 12 and 13 and 14 and 15 the first, second and third channels, respectively, of the delay circuit 16-18 and and the outputs 19-21 for switching on the channels. The signals 10, 12 and 14 are variable, and the signals 11, 13 and 15 are reference. The outputs of the elements 7, 8 and 9 give signals for switching on the first, second and third channels, respectively. The signal delay time of the chains 16-18 3-delay is greater than the switch-on time of the AND 4-6 elements. In the initial state, the signals 10, 12, and 14 are zero, and the signals 11, 13, and 15 are constantly present. At the outputs of blocks 1-3 comparisons and elements AND 4-9 there are no signals. This means that all channels are turned off. With the appearance of signals 10, 12 and 14, they cannot be exactly the same. If signal 10 compares with signal 11 earlier than others, the output of the comparison unit 1 is the signal that goes to the input of the element 4 and through the delay circuit 16 to the input of the element 7, and the output of the element 4 is turned on the inverse inputs of the And 5-7 elements and block them Since the operation time of the circuits 16-18 delays is longer than the response time of the And 4-6 elements, the signal to the input of the And 7 element from the delay circuit 16 comes after the signal from the output of the And 4 element, by which the element And 7 will be blocked. If the second signal that has reached its reference value is signal 12, then from the output of comparison block 2 the signal will arrive at elements of AND 5 and 8. Since element 5 is blocked, then element 8 will give a signal to turn on the second signal and simultaneously to block elements And 7 and 9. If comparison block 3 then operates, the state of the signals at the output of the device does not change. Since the signal 12 is the second after the signal 10 has reached its reference signal and earlier than the signal 14, therefore, it is average between them. If the switching time of the actuator is longer than the response and release time of the AND element, then delays can be eliminated. False signals from the first triggered comparison unit with the duration of the tripping and switching on of the And element occur at the output of the device, but the actuator will not trigger. The device can be performed for any number of channels. For example,.

for five channels, where an average signal can be received, the third largest, the number of rows of AND elements will be equal to three, and the number of AND elements in a row will be equal to five. The first comparison block that has been triggered will block the output of its channel and the elements AND of the first row of other channels. The second triggered comparison unit will block the output of its channel | AND element AND BTopotO to a number of other channels. The third triggered comparison unit issues a signal to the third channel BKJH04e and blocks the outputs of the remaining signals,

Thus, the proposed device always connects only the average value.

and therefore the most reliable parameter.

Galvanic isolation between the channels is carried out in a drive circuit ;; signals, e.g., on the comparison block using the hub. This significantly increases the reliability of the device, and the possibility of using it for any number of channels expands its scope.

It is most efficient to use the proposed device in a multichannel system for automatic pack-. This is where, as the control, the mean value tJKxny is chosen as the remaining value, and the rest is the deviation signal of the measured parameter from the specified one.

Claims (1)

A DEVICE FOR CONTROLLING RESERVE CHANNELS SWITCHING, containing the first AND elements, comparison blocks, the inputs of which are connected to the outputs of the input signal sources, and the outputs - with the inputs of the first elements AND of their channel, characterized in that they are introduced with a circuit to increase reliability and expand the scope of application according to the number of backup channels, delay elements, as well as second AND elements in each row, the number of rows is equal to the number of the middle channel, and the output of each second AND element is connected to the inverse inputs of the second elements And other GIH channels in a row, and via a delay element with an inverted input of a second AND element in its channel subsequent row.