Power-off restart automatic control circuit

Abstract

The invention relates to the field of electronic circuit control, in particular to a power-off restart automatic control circuit. The power-off restart automatic control circuit provided by the invention is used for controlling outage restart of a hardware circuit board, and comprises the hardware circuit board which sends an outage reset signal to a charging and discharging loop module and controls the charging and discharging loop module to charge and discharge; the charging and discharging loop module outputs a charging voltage or a discharging voltage as a comparison voltage to the comparison circuit module; the comparison circuit module is used for comparing the comparison voltage with a reference voltage and outputting a switch off signal or a switch on signal to the switch circuit module; and the switch circuit module is used for controlling the circuit of the switch circuit module to be disconnected or connected according to the switch disconnection signal or the switch connection signal and controlling the power supply module to supply power to the hardware circuit board. Complete power-off restart of the whole hardware circuit board is controlled through a small number ofcomponents, the power-off duration can be adjusted, manual power-off restart operation is reduced, and the failure rate of the circuit board is reduced.

Description

technical field [0001] The invention relates to the field of electronic circuit control, and more specifically, relates to a power-off restart automatic control circuit. Background technique [0002] In some railway electronic product applications, due to the long-term continuous power operation of electronic products, it is easy to cause abnormal system operation and software reset is invalid. However, the existing hardware power-off reset can only target a small part of the circuit, and cannot control key parts such as The power failure of the CPU itself, in particular, cannot control the power failure and restart of the entire circuit board. [0003] For example, the Beidou / GPS plug-in in the comprehensive information monitoring device (LDP) on the locomotive requires 24-hour uninterrupted power supply. There is a hardware watchdog circuit in the plug-in, which can monitor the working status of the power supply and processor in real time, and reset some power supplies. c...

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