A low-voltage power-down delay control device and control method

Abstract

The invention discloses a low-voltage power-off time delay control device and a control method thereof. The control device comprises a standby power supply module, a control management module and a power-off detecting module. The control management module is connected with the standby power supply module and the power-off detecting module. The power-off detecting module performs real-time detection on the state of a power supply. The control management module makes a load perform a data operation according to the state of the main power supply and the state of the standby power supply module, and performs controlling for switching on or switching off the standby power supply module. The control method comprises the steps of when the main power supply is switched on, starting the power-off detecting module and connecting with the standby power supply module for performing energy storage; when energy storage is finished, making the load start key data processing; when power-off of the main power supply occurs, making the connected standby power supply module output the stored energy; and the load finishes data storage, switching off the standby power supply module. The low-voltage power-off time delay control device and the control method thereof have advantages of simple structure, low cost requirement, high energy utilization rate, high power-off time delay stability, high safety, high reliability, etc.

Description

technical field [0001] The invention relates to the technical field of low-voltage power-off delay processing, in particular to a low-voltage power-off delay control device and control method. Background technique [0002] The power-down delay means that after the main circuit is powered off, it can continue to provide power to the load for a period of time, so that the load can have time to save important tasks or data. In low-voltage power-down delay processing, power-down delay circuits based on LC energy storage or super capacitors are usually used at present. The power-down delay circuit based on LC energy storage uses inductors and capacitors as energy storage devices, and uses the energy stored in the inductor and capacitor to complete the delay function after power-off; the power-down delay circuit based on supercapacitors uses The supercapacitor is used as an energy storage device, and the energy of the supercapacitor is used to complete the delayed power-off funct...

AI Technical Summary

Problems solved by technology

[0004] (1) The power-down delay cannot be executed according to the state of the energy storage device and the load in real time, and the state of the energy storage device or the load is not suitable for implementing the power-down delay after power-off, and the power-down delay is started at this time Not only can it not play an effective delay effect, but it may bring unstable factors to the load and affect the stability and reliability of the system operation.

If the processor starts to perform the power-down data preservation action when the energy storage device has not completed the energy storage, and the energy storage device cannot provide enough time to support the processor to complete the action, it will cause an uncertain exception;

[0005] (2) Since the power-off delay circuit is started when the power is off, and it is not automatically closed until the energy is exhausted, and the state of the power-off delay circuit cannot be controlled in real time according to the state change of the main power supply, it will be restored immediately after power-off Under the circumstances, it may cause system exception;

[0006] (3) Since the above-mentioned power-down delay circuit is started, the state of the power-down delay circuit cannot be controlled in real time according to the state of the load. Even if the load does not need the power-down delay function, if the data preservation of the load is completed, it will continue to work until the energy is restored. Consumed, resulting in waste of energy

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