Automatic power-down restart circuit and corresponding Internet-of-things gateway

Abstract

The invention discloses an automatic power-down restart circuit and a corresponding Internet-of-things gateway. The circuit comprises a first processing unit, a state monitoring unit, a power failurerestart function selection unit, a delay power-on control unit, a power supply control unit and a filter network unit. According to the circuit, when system software runs abnormally, the state monitoring unit is controlled to send a low-level signal to the power-down restart function selection unit, so that the power-down restart function selection unit outputs the low-level signal to the delay power-on control unit to immediately respond to the abnormal state of the system and carry out power-down restart operation; the problem that when the system is abnormal, normal operation cannot still be achieved through watchdog circuit reset is solved, and the situation that the system operates abnormally due to insufficient power failure is avoided. Moreover, when the system software is upgradedand cannot be timely fed to the dog, the watchdog circuit function can be shielded in advance, so that sufficient time for upgrading the system is ensured.

Description

technical field [0001] The invention relates to an automatic power-down restart circuit, and also relates to an Internet of Things gateway including the automatic power-down restart circuit. Background technique [0002] At present, most IoT gateways have a watchdog circuit to send a reset signal to the CPU (central processing unit) when the device is abnormal, and the hardware reset pin of the CPU receives the reset signal to restart the system software. [0003] In the railway industry, the operating environment of IoT gateways in most scenarios is relatively harsh. There are many on-site communication devices and the electromagnetic environment is complex. There are some malfunctions that cannot be recovered by simple reset. In addition, some potential faults cause the software of the gateway device to fail to feed the dog on time. Although the hardware watchdog chip keeps resetting the CPU, the gateway device still cannot operate normally. In this case, the maintenance ...

AI Technical Summary

Problems solved by technology

[0003] In the railway industry, the operating environment of IoT gateways in most scenarios is relatively harsh. There are many on-site communication devices and the electromagnetic environment is complex. There are some failures that cannot be recovered by a simple reset

In addition, some potential faults cause the software of the gateway device to fail to feed the dog on time. Although the hardware watchdog chip keeps resetting the CPU, the gateway device still cannot operate normally. In this case, the maintenance personnel often cannot locate it within a short time after arriving on site. The reason, and the device may return to normal after the gateway device is powered on again

There are many reasons for this kind of failure. For example, due to electromagnetic interference, a certain logic of the CPU external device is abnormally reversed, which makes the software abnormal when reading the logic signal, and the CPU is abnormal when processing the task related to the logic signal. "crash"

Since the hardware watchdog chip can only reset the CPU, it cannot restore the logic state of the CPU's external logic devices to normal; when the CPU restarts, the software will process the logic signal again abnormally, resulting in another "crash", only through power-off Restart the device to return the state of all logic devices to the initial state to solve the fundamental problem

[0004] The occurrence of the above faults is unpredictable in practice. For IoT gateways operating in remote areas such as railway unattended computer rooms and monitoring stations, maintenance personnel need to rush to the scene in time, but they cannot locate the cause. The operation of restarting the power is a serious waste of human resources and increases maintenance costs

At the same time, due to the characteristics of the railway industry, many computer rooms are located in remote locations. When the above-mentioned failures occur, maintenance personnel need time to rush to the scene. During this period, the key equipment data monitored by the perception layer will not be sent to the cloud due to the failure of the gateway, nor can it be stored locally in the gateway. Storage space, resulting in the loss of status data of key monitored equipment, causing irreparable losses to users' big data accumulation and analysis applications

Moreover, if the gateway is in a fault state for a long time and resets continuously, it will not only be a huge test for the reliability of the device software, but also due to the fault of the gateway, the cloud will not be able to remotely control the sensors at the perception layer, which will cause greater losses

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