Method, circuit and device for resetting electronic system

Abstract

The invention relates to a method for resetting an electronic system, which comprises the following steps of: obtaining a first periodic signal with high level or low level time duration being T1, low level or high level time duration being T2 and a period being T1+T2 from alternating current which supplies power for the system; extracting a second periodic signal with the period being T3 from the system; and conducting logical operation to the first periodic signal and the second periodic signal so as to obtain a third periodic signal and transmit the third periodic signal to the control end of a controlled switch. The invention also discloses a circuit for realizing the method and a device provided with the circuit. The implementation of the method, the circuit and the device for resetting the electronic system has the following beneficial effects: the working state of the system can be monitored in real time, and the system can be reset automatically and reliably.

Description

technical field [0001] The invention relates to a method, circuit and system for resetting an electronic system. Background technique [0002] The vast majority of electronic systems are powered by AC power, but often due to power grid interference, lightning and other reasons cause the system to crash in an abnormal working state. The intelligent control unit of the electronic system generally has a reset circuit. The function of these reset circuits is to provide a high or low level on the reset signal line of the system chip for a certain period of time (set it as T), and the system chip detects After the voltage is reached, reset action is taken to clear the content of the working memory, clear the program counter, make the CPU call the initialization file from the memory, initialize the ports of each control chip, etc. These actions need time to complete, usually set to T 0 Generally speaking, some reset circuits use chips, and some use discrete devices. But no matter...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a system that can be operated automatically, in view of the defects of the prior art such as the need for manual operation, the time lag and the time when the system fails, and the inability to reset the system again according to the state after the system is reset once. A method for resetting the system that can be automatically reset when the system state is abnormal, and can be reset multiple times according to the system state, and a circuit for realizing the method

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