Access control system power-off protection circuit and system thereof

Abstract

The invention relates to an access control system power-off protection circuit and a system thereof. The power-off protection circuit comprises a charging interface, an output interface, a first capacitor, a second capacitor, a first super capacitor, a third capacitor, a second super capacitor, a three-terminal voltage stabilizer and an anti-discharge diode, a second pin of the charging interface is connected with an input end of a three-terminal regulator and one end of a first capacitor, an output end of the three-terminal regulator is connected with a positive electrode of an anti-discharge diode and one end of a second capacitor, and a negative electrode of the anti-discharge diode is connected with a positive electrode of a first super capacitor, one end of a third capacitor, a positive electrode of a second super capacitor and a first pin of the output interface; and the first pin of the charging interface is connected with the second pin of the output interface, the other end of the first capacitor, the grounding end of the three-terminal regulator, the other end of the second capacitor, the negative electrode of the first super capacitor, the other end of the third capacitor and the negative electrode of the second super capacitor are connected with a connecting line of the second pin of the output interface and the first pin of the charging interface. The problems of high risk, instability and the like of the existing access control standby power supply can be solved.

Description

technical field [0001] The invention relates to the field of backup power supplies for access control systems, in particular to a power-off protection circuit for an access control system and a system thereof. Background technique [0002] In traditional access control systems, the motherboard uses alkaline batteries as backup power. The battery provides power support for the motherboard to shut down the system and save its information. The existing technology has the following disadvantages: the battery has self-discharge, and if it is not used for a long time, it will self-discharge to completely empty, and it cannot be found in time, and the backup power function cannot be completed, which affects the system function. When the access control system is powered off for a long time, the battery is easy to leak, which will cause the main board circuit board to be corroded, resulting in system failure. [0003] In addition, the general circuit structure in the traditional ac...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a power-off protection circuit for access control systems to solve the problems of high risk and unstable performance of the existing access control system backup power supply

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