A method and device for power failure protection

Abstract

A power-off protection method is provided, which is used to protect the device when the device loses an external power supply, the device includes a control unit, a first functional unit, and a second functional unit, and the method includes: In the first stage of protection, the voltage of the device is compared with a first threshold, and when the voltage is lower than the first threshold, the power supply of the first functional unit is stopped, and in the second stage of power-down protection, the The voltage is compared to a second threshold, and when the voltage is lower than the second threshold, the control unit is caused to stop operating and the second functional unit is caused to operate. Also provided are a device for power-down protection and equipment supporting power-down protection.

Description

technical field [0001] The present invention relates to a power-down protection method and device, and more particularly to a power-down protection method and device for protecting equipment when the equipment loses an external power supply. Background technique [0002] For devices with external power supply, power failure protection is an essential function, which is used to protect the device when the device loses the external power supply, so that the device can work normally again when the external power supply is restored. [0003] Generally speaking, the common method for implementing device power-down protection is to rely on batteries or large capacitors, supplemented by software and hardware facilities, so that the device can properly back up important operating data and reset some key circuits after losing the external power supply. Prepare for system safety after loss of power and proper operation of equipment when external power is restored. Common processing m...

AI Technical Summary

Problems solved by technology

Among them, in the last step of "resetting key circuits", after the control unit sends out the "reset" command, the subsequent work does not require the participation of the control unit at all, and the control unit is in an idle state, but maintaining the operation of the control unit requires the consumption of capacitors. energy

In particular, the current control unit circuit has a relatively high power consumption due to its high operating speed, which can reach as much as 1W.

The energy storage of the capacitor is proportional to the square of the voltage, and the capacitor voltage is already very low in the last link, but it takes a certain amount of time and voltage to maintain the reset key circuit, all of which need to increase the capacitor value as a cost, and at the same time , also requires a larger capacitor

Such problems not only reduce the utilization rate of energy, but also cause the defect of large volume of equipment

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