SU558432A1 - Three-channel analog majority element - Google Patents

Description

one

The invention relates to the field of analog technology and to be used to increase the reliability of precision devices with a continuous output signal.

A device is known that contains p diode bridges (where p is the number of reserved devices, odd and more than 2), 2 p balancing resistances and a source of direct current voltage that performs the operation of averaging the majority of signals that go beyond the tolerances 1.

However, the known device has drawbacks, such as instability of the parameters, the dependence of the error on the load, and Tlavi of them is that the accuracy of withstanding threshold voltages, on which the analog signal depends, is 5%, which does not allow reserve precision analog devices, such as code-to-voltage converters, which have a sufficiently high conversion accuracy (up to 0.1%).

A three-channel analog majority element is known, containing three elements for comparing analog signals, the minus inputs of each of which are connected to the positive input of each subsequent one and with redundant signal sources, inverters connected to the outputs of each element for comparing analog signals 2.

However, such an element is not accurate enough and reliable in operation.

The purpose of the invention is to increase the accuracy and reliability of operation - it is achieved by introducing three logical elements 2I-2OR-NOT into the offered three-channel analog majority element, two inputs of each of which are connected to the outputs of the element for comparing the analog signals and the inverter of the given channel, and two others the inputs of each of which are connected to the outputs of the element for comparing analog values and the inverter of the corresponding adjacent channel.

FIG. 1 shows a diagram of a three-channel analog small source element; in fig. 2 - time diagram of the element. The circuit contains elements 1 for comparing analog signals, inverters 2, logic elements 2I-2, OR-NOT 3.

The device works as follows. Output plots from redundant devices are supplied for comparison between themselves and to the value of the inputs of the "+ and" - elements of the comparison 1, the outputs of which are logic levels "O or" 1, and "O, if the larger of the comparisons is supplied to the input “-, and“ 1, if the larger of the compared voltages is supplied to the input “+. The result of the comparison of three voltages in the forward and in reverse form after the inverters 2 is fed to a circuit consisting of logic elements 2I-2OR-NOT. The outputs of the control channels are connected to the output of an analog device, whose signal is the average of three redundant precision devices. The time diagram (see FIG. 2) proves that in the time interval the signal from the redundant device II is average, in the time interval i-tz are devices III, from tz to 3 are devices I, from 3 to t is again III and after t - devices P.

Thus, the three-channel analog majority element provides accurate output transfer by connecting a continuous signal to the output bus from redundant precision devices having an average amplitude value among the three values, which ensures the trouble-free operation of the triple system within the acceptable values of the output signal At / and even when breaking down one of the devices.

Claims (2)

1. USSR author's certificate N ° 190664, M. Kl.2 G 06F 7/02, 1958. 2. "Instruments and control systems, 1972, No. 6, p. 18. L