Minimum value taking circuit

Abstract

The invention discloses a minimum value taking circuit. The minimum value taking circuit comprises multiple paths of signal sources, a following module, a minimum value taking module and an isolating module which are connected in sequence. The isolating module is used for outputting the minimum value of the signal sources, and the output end of the isolating module is further fed back to the following module. According to the minimum value taking circuit, the minimum value taking module and the isolating module are included in the following module through the changes of the connecting relation of the following module, the minimum value taking module and the isolating module, and thus the difference of a discrete device and the output error caused by temperature drift are eliminated; through the feedback state of the following module, the automatic compensation for the deviation of tube voltage drop is achieved, and the accuracy and the reliability of control signals are improved.

Description

technical field [0001] The invention relates to the technical field of control signal reliability design, in particular to a minimum signal gating circuit. Background technique [0002] Reliable transmission of control signals is an important part of the technical field of circuit reliability design. When multiple control signals control the same output, it is often necessary to select the correct control signal. Among them, the selection of small signals is an important control signal selection method. The circuit has the advantages of simple structure, less components, and low cost. [0003] The traditional small circuit can correctly output the minimum value when its own device is working normally. The schematic diagram of the principle is as follows: figure 1 shown. Such as figure 1 As shown, V1', V2', V3' represent signal sources, D1'~D4' represent diodes, where D4' is an isolation diode, R0'~R3' represent resistors, where R0' is a pull-up circuit resistor, U1'~ U3'...

AI Technical Summary

Problems solved by technology

[0004] Although the circuit is simple and easy to use, it has inherent disadvantages, mainly two: the diodes of discrete devices or environmental factors will cause deviations in the voltage drop between the tubes, and the deviation cannot be compensated in the circuit, while the output of the circuit The value is the sum of the signal input value and the voltage drop deviation of the two tubes, resulting in an error in the circuit output; due to the existence of temperature drift, the device is unstable, resulting in poor accuracy of the control signal

Therefore, due to the existence of its own inherent defects, the traditional small circuit reduces the accuracy and reliability of the circuit to a certain extent.

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