Overcurrent alarming circuit

Abstract

The disclosed alarm circuit for overcurrent comprises: connecting a current detection circuit to target load in series to provide voltage for the first input of a comparison circuit according to load current, connecting a element with adjustable output voltage to the second input of comparison circuit to provide dynamic voltage; using the comparison circuit to compare two input voltages and hereby generate alarm signal. This invention is simple and saves hardware.

Description

technical field [0001] The invention relates to electronic equipment, in particular to a current overcurrent alarm circuit. Background technique [0002] Excessive current flowing through the load will affect the life of the load, and seriously damage the load. [0003] For some important electronic equipment, a current overcurrent alarm circuit is generally set for it. When the load current exceeds the predetermined current threshold value, an alarm signal is generated. According to the alarm signal, methods such as cutting off the power supply of the load are adopted to avoid the overcurrent current. load damage. [0004] At present, the current overcurrent alarm circuit is mainly composed of a current detection circuit, a threshold element and a comparison circuit. The main realization principle is: the current detection circuit detects the current of the load, and the detected current flowing through the load is an input of the comparison circuit. The terminal provides...

AI Technical Summary

Problems solved by technology

The threshold element in the above-mentioned current overcurrent alarm circuit can only provide a fixed voltage threshold, that is, the threshold element cannot change the voltage provided at the input terminal of the comparison circuit, so that the above-mentioned current comparison circuit can only adapt to the external situation by changing the hardware. The change of the hardware not only causes a waste of hardware resources, but also, in the environment such as field work, it is impossible to change the hardware

[0006] To sum up, the existing overcurrent warning circuit cannot flexibly realize the overcurrent warning function, which limits the application range of the overcurrent warning circuit and limits the implementation flexibility of the equipment where it is located.

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