Switch control method and apparatus for reserve power supply

Abstract

An embodiment of the invention provides a switch control method and apparatus for a reserve power supply. The switch control apparatus for the reserve power supply comprises a main power supply loop and a reserve power supply loop; a main power supply and loads are connected respectively through the main power supply loop and the reserve power supply loop; the reserve power supply loop comprises a reserve power supply, a reserve power supply charge-discharge loop, a comparison control circuit and a reserve power supply loop switch; the main power supply charges the reserve power supply through the reserve power supply charge-discharge loop; the comparison control circuit is connected with the reserve power supply; the reserve power supply charge-discharge loop is connected with the loads through the reserve power supply loop switch; the comparison control circuit detects voltage of the reserve power supply; when the voltage of the reserve power supply is higher than a first voltage threshold value, the comparison control circuit controls the reserve power supply loop switch to be switched on; and when the voltage of the reserve power supply is lower than a first voltage threshold value, the comparison control circuit controls the reserve power supply loop switch to be switched off. The switch control method and apparatus for the reserve power supply provided by the embodiment of the invention are used for improving the stability when the reserve power supply is used for supplying power to the loads.

Description

technical field [0001] The embodiments of the present invention relate to the field of circuit technology, and in particular to a backup power switching control method and device. Background technique [0002] In electronic equipment, the main power supply may suddenly lose power, which will cause the loss of data being processed during system operation. Therefore, it is necessary to delay the backup power of the main power supply, so that the backup power supply can continue to supply power to the core system after the main power supply is powered off, so as to ensure that the key information of the system can be stored. [0003] The backup power delay is to set the backup power supply. When the main power supply fails, the backup power supply will supply power to the core system. The power supply time of the backup power supply is the backup power delay time. At present, the single-board backup power supply is generally designed based on supercapacitors. During the operat...

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Problems solved by technology

[0004] However, when the backup power supply is powered, if the main power supply is restored, the current of the load system will fluctuate greatly during the process of switching from the backup power supply to the main power supply, which will affect the stability of the load system and the reliability of data.

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