Monitoring circuit of control system

Abstract

Disclosed is a monitoring circuit of a control system. The monitoring circuit comprises an outage circuit, an enable circuit, a restoration time-delay circuit, a watchdog circuit and a main control central processing unit (CPU); when the main control CPU is in abnormal work, the third port of the main control CPU outputs an electrical level free of jumping change; when the electrical level free of jumping change is input into the input port of the watchdog circuit, an internal counter cannot conduct zero clearing and overflows, and the output port outputs a low electrical level; when the input electrical level of the enable port of the enable circuit is a high electrical level, the output electrical level of the second port of the enable circuit is identical to the input electrical level of the first port of the enable circuit, and both the output electrical level and the input electrical level are low electrical levels; when the input electrical level of the third port of the outage circuit is a low electrical level, the outage circuit enters a switch-off state, so that the main control CPU is switched off and restarted. Through the monitoring circuit of the control system, fault monitoring of the control system, namely the main control CPU, can be achieved, and when the faults are removed, new instable faults generated due to insufficient outage can be avoided.

Description

technical field [0001] The invention relates to the field of control systems, in particular to a monitoring circuit of the control system. Background technique [0002] With the rapid development of the electronics industry, the functions of electronic products are becoming more and more powerful, and the core control systems of electronic products are becoming more and more complex. Stability requirements are getting higher and higher. Although with the development of electronic technology, the control system generally has some self-protection mechanisms, but a series of software failures such as crashes, restarts, software runaways or program loss cannot be avoided. Although the software failure will not cause direct equipment damage, it can be restored to normal work through artificial software maintenance, but it will cause indirect economic losses or safety failures. Especially in industrial control, security monitoring, vehicle electronics, etc. In the field of securi...

AI Technical Summary

Problems solved by technology

Although software failure will not cause direct equipment damage, it can be restored to normal work through artificial software maintenance, but it will lead to indirect economic losses or safety failures

Especially in some safety fields such as industrial control, security monitoring, and vehicle electronics, the accidental failure of the core control system software may cause very large economic losses or hidden dangers to personal safety.

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