Instantaneous power-down monitoring device and power-down processing method for DC power supply

Abstract

The invention discloses an instantaneous power-down monitoring device and a power-down processing method for a DC power supply, belonging to the technical field of power-down protection of electronic products. The instantaneous power-down monitoring device can monitor a circuit board power supply in real time, provide a power-down signal when the power supply is powered down or powered off, and the device can provide short time power supply for micro-processing chips and power-down protection auxiliary devices in the electronic products; and the power-down processing method is fit for the electronic products utilizing the micro-processing chips, and the power-down processing method completes such power-down protection actions within a short power supply time of the device, for example, data storage, system working state adjustment, alarm information transmission and error information transmission, etc. The device and the method disclosed by the invention are fit for the DC power supply and have the advantages of extensive application range, simplicity in the circuit, low cost and reliability in working, etc.

Description

technical field [0001] The invention relates to an instantaneous power failure monitoring device and a power failure processing method, and belongs to the technical field of power failure protection of electronic products. Background technique [0002] In engineering applications, many electronic products need to complete power-off protection actions when the system is abnormally powered off or shut down, such as saving data, adjusting the working status of the system, sending alarm signals, sending error messages, etc. [0003] Due to the high power consumption of the system composed of PCs, the shutdown process is complicated and takes a long time. When the input power fails instantaneously, a backup power supply is required to ensure that the system can be shut down normally. Such as the Chinese invention patent "power-down protection method, device, logic device and storage system" (application number: 200710307035.X) and the Chinese invention patent "a power-down protec...

AI Technical Summary

Problems solved by technology

The method given in this patent involves two CPUs, and the circuit is relatively complicated, and it can be seen from its embodiment that it is only applicable to a special low-voltage single-chip microcomputer STC12C5202AD, and is not suitable for other single-chip microcomputer circuits; at the same time, when the detected voltage drops When the power is turned on, the patent requires that the power supply of the 32-bit CPU can work normally in order to realize data preservation.

In practical applications, when the detected voltage is powered off, the power supply voltage of the 32-bit CPU will also be powered off at the same time. This patent does not provide a method to ensure that the power supply of the 32-bit CPU can be powered normally after the power is turned off.

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