Self-power down fingerprint lock

Abstract

The invention provides a self-power down fingerprint lock. The self-power down fingerprint lock comprises a fingerprint identifier, a control contact is coupled between the fingerprint identifier and a power supply and coupled to a detection circuit, and the detection circuit comprises a pyroelectric sensor and a time-delay circuit; the pyroelectric sensor is coupled with the time-delay circuit, when the pyroelectric sensor detects a biological heat source, the pyroelectric sensor sends a holding signal, and when the time-delay circuit loses the holding signal for a first time, the time-delay circuit sends a control signal, and the control contact is controlled by the control signal to be off. Through the arrangement, when a human body gets close to the self-power down fingerprint lock, the pyroelectric sensor firstly detects the human body, the holding signal is sent to control the control contact to be in a switched-off state, and therefore the fingerprint identifier is in a power-on working state; if no human body gets close to the self-power down fingerprint lock for a long term, the circuit keeps a static state, holding is conducted through the time-delay circuit at the moment, but a power down operation is conducted after the holding time exceeds the time-delay time, and therefore the service life of the equipment is guaranteed.

Description

technical field [0001] The invention relates to a self-power-off fingerprint lock. Background technique [0002] Fingerprint lock is an intelligent lock that uses human fingerprints as the identification carrier and means. It is the perfect crystallization of computer information technology, electronic technology, mechanical technology and modern hardware technology. Fingerprint locks are generally composed of two parts: electronic identification and control, and mechanical linkage system. The uniqueness and non-reproducibility of fingerprints determine that fingerprint locks are the safest locks among all locks at present. In addition to fingerprint recognition, fingerprint locks should be equipped with emergency mechanical keys according to national regulations. [0003] The fingerprint collector is a precision electronic device that uses the different characteristics of human fingerprints for identification. Its working principle includes four functions: collecting fing...

AI Technical Summary

Problems solved by technology

[0007] But at present, there is a big problem in the use of this kind of fingerprint sensor. If it is kept under working conditions for a long time, its service life is easily affected by electrostatic effects, dust, water droplets, etc. Similarly, it also wastes a lot of electric energy.

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