Safe signal processing circuits for computer systems

Abstract

The invention belongs to the field of electronic technology and relates to a computer system safety signal processing circuit. It consists of a computer I / O port, a DC blocking coupling circuit, a filter circuit and an amplifying circuit in series. The computer I / O port outputs a pulse-width modulated square wave, which is input to a level conditioning circuit after DC blocking coupling, filtering, and amplification. The level conditioning circuit outputs a safety control signal. The invention is simple, practical, safe and reliable, easy to implement, and can be widely used in digital control occasions requiring safety control.

Description

Safe signal processing circuits for computer systems technical field The invention belongs to the field of electronic technology and relates to a computer system safety signal processing circuit. Background technique The basic requirements of the computer system for the safety signal processing circuit are: when the system is abnormal, the control level of the safety signal should be in a definite and controllable level state. In the general computer application system, the computer's I The / O pin realizes the control output of the interface level. Since the computer microprocessor essentially uses the gate circuit as the basic unit of digital logic control, the working state of the gate circuit is usually expressed in the form of "0" and "1". In this way, when the computer system is abnormal, because the working state of its interface level is unknown, it cannot be guaranteed or required that this kind of system will not present a certain level output state when a fault o...

AI Technical Summary

Problems solved by technology

The basic requirements of the computer system for the safety signal processing circuit are: when the system is abnormal, the control level of the safety signal should be in a definite and controllable level state. In the general computer application system, the computer's I The / O pin realizes the control output of the interface level. Since the computer microprocessor essentially uses the gate circuit as the basic unit of digital logic control, the working state of the gate circuit is usually expressed in the form of "0" and "1". In this way, when the computer system is abnormal, because the working state of its interface level is unknown, it cannot be guaranteed or required that this kind of system will not present a certain level output state when a fault occurs, thus making the system sensitive to the safety signal Difficulty in handling, which may lead to danger

At present, there is no effective security guarantee processing circuit for this type of signal

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