Circuit with automatic power-off restarting function in equipment failure

Abstract

The invention provides a circuit with an automatic power-off restarting function in equipment failure. A CPU of the equipment is connected with a key device of the equipment and the CPU is capable of monitoring the working state of the key device; when the equipment has hardware damage-free failure, the CPU stops outputting a feeding-dog signal, a watchdog circuit does not trigger the system hardware reset any more, and outputs a power switch control signal; a power switch circuit turns off the direct-current power supply of the equipment after being triggered; and after certain time delay, the power switch circuit automatically starts the direct-current power supply of the equipment to ensure that the equipment is restarted to restore the normal work. According to the circuit provided by the invention, the failure problems of all the hardware damage-free units can be solved; no matter whether the units with failures have hardware reset functions or not, the adopted power-off restarting manner is more thorough than the traditionally adopted hardware reset manner.

Description

technical field [0001] The invention relates to the field of electronic circuit design, in particular to a circuit that can be automatically powered off and restarted in case of equipment failure. Background technique [0002] The design idea of ​​the traditional fault recovery circuit is: when the device is working normally, the CPU (core processor) always outputs the "feed the dog" signal, and the watchdog circuit will not trigger the system reset; when the device fails, the CPU will stop outputting " Feed the dog" signal, the watchdog circuit will trigger the system reset, so that the system can resume normal operation. When the device has a fault without hardware damage, if the faulty unit does not have a hardware reset function, the traditional fault recovery circuit cannot solve the problem through reset; if the faulty unit has a hardware reset function, the fault remains after the hardware reset when the device is powered Exists, but this fault can be solved by power...

AI Technical Summary

Problems solved by technology

When the device has a fault without hardware damage, if the faulty unit does not have a hardware reset function, the traditional fault recovery circuit cannot solve the problem through reset; if the faulty unit has a hardware reset function, the fault remains after the hardware reset when the device is charged Exist, but the fault can be solved by restarting the power, and the traditional fault recovery circuit cannot solve this kind of problem

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