Load disconnection detection circuit and wired terminal device

Abstract

The invention discloses a load open circuit detection circuit and a wired terminal device. The circuit comprises a detection module and an alarm unit. The detection module is connected with a main battery and a load terminal, the load terminal is used for controlling connection or disconnection of the detection module, and the main battery is connected with the power end of the load terminal and the ground through the detection module to form a loop; the alarm unit is connected with the loop and the main battery, and the main battery supplies power to the alarm unit; the main battery is electrically connected with the load terminal and supplies power to the load terminal; when the loop is conducted, the alarm unit acquires a first signal; when the detection module is disconnected with theload terminal, the loop is disconnected, and the alarm unit acquires a second signal; when the alarm unit obtains the second signal, an alarm is given out according to setting. The detection module timely sends a signal to inform the alarm unit by detecting on-off of a loop, so that the detection structure is more accurate; main battery end detection is not needed, the detection result is more accurate, and disconnection of the load terminal can be found in time.

Description

technical field [0001] The invention relates to the technical field of detection circuits, in particular to a load breaking detection circuit and a wired terminal device. Background technique [0002] The terminals or modules of the Internet of Things or anti-theft devices generally consume very low power consumption when they are in standby. In order to save power, such terminal modules generally work alternately in periodic sleep and receiving states. The lowest sleep current in standby is even lower than one microampere ( 1uA), if it is artificially disconnected from the main battery terminal during the sleep period of the terminal module or in the shutdown state, the main battery terminal is difficult to detect. Contents of the invention [0003] The main purpose of the present invention is to provide a load disconnection detection circuit and a wired terminal device, aiming to solve the problem that the main battery terminal is difficult to detect when the existing te...

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide a load disconnection detection circuit and a wired terminal device, aiming to solve the problem that the main battery terminal is difficult to detect when the existing terminal module is artificially disconnected from the main battery terminal during sleep or in the shutdown state question

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