Under-voltage detection circuit
An undervoltage detection and circuit technology, which is applied in the direction of measuring electrical variables, measuring devices, measuring current/voltage, etc., can solve the problem of high cost of undervoltage protection, achieve the effect of reducing the cost of electronic components and simple circuit structure
Pending Publication Date: 2020-08-25
SHENZHEN MICHOI SECURITY TECH
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Problems solved by technology
[0005] The main purpose of the present invention is to provide an undervoltage detection circuit, which aims to solve the technical problem of high cost of undervoltage protection when the existing DC power supply is powered
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[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0026] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relationship between various components under a certain posture (as shown in the accompanying drawings). The relative positional relationship, the movement situation, etc., if the specific posture changes, the directional indication also changes accordingly. ...
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Abstract
The invention discloses an under-voltage detection circuit, which comprises a voltage stabilizing diode, a first triode, a second triode, a first resistor, a second resistor, a third resistor and a control module, an interrupt interface of the control module is electrically connected with a collector of the second triode and used for judging whether the input voltage of the power input interface is in an undervoltage state or not according to the collected voltage of the interrupt interface. When the voltage of the power supply input interface is smaller than the voltage threshold value; the voltage stabilizing diode is cut off, so that the first triode is cut off, the second triode is conducted, the collector electrode of the second triode is at a low level, the collected voltage of the interrupt interface has voltage jump, the control module judges that the input voltage is in an undervoltage state according to the collected voltage of the interrupt interface, and then whether the input voltage is undervoltage or not can be accurately judged. The detection circuit only adopts simple electronic parts such as a voltage stabilizing diode and a triode, the circuit structure of the detection circuit is simple, and the cost of the electronic parts for undervoltage detection is greatly reduced.
Description
technical field [0001] The present invention relates to the technical field of undervoltage detection, in particular to an undervoltage detection circuit. Background technique [0002] Today, many electronic products are powered by DC power, and long-distance power supply is common. For example, the distance between the power supply and the terminal equipment is in the range of 10 to 50 meters. For terminal equipment with a long distance between the power supply and the terminal equipment, during the long-distance power supply process, due to the contact resistance of the power supply connection wire and the oxidation of the wire due to moisture, the output voltage is lower than the normal power supply voltage, which will inevitably be As a result, the power supply of the terminal equipment is in an abnormal state of low-voltage power supply for a long time, which causes some functions to fail to work normally, resulting in performance failures of the terminal equipment. ...
Claims
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IPC IPC(8): G01R19/165
CPCG01R19/16523
Inventor 沈卫民刘祖芳骆传伏黄猛贺秀星
Owner SHENZHEN MICHOI SECURITY TECH