Overcurrent alarming circuit

A technology of an alarm circuit and a current detection circuit, which is applied in the direction of measuring current/voltage, measuring electrical variables, and using digital measurement technology for measurement, etc., can solve the problem that the current overcurrent alarm circuit cannot flexibly realize the current overcurrent alarm function and change the hardware. , limit the flexibility of equipment implementation, etc.

Active Publication Date: 2006-11-22
HUAWEI TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

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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 on

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Embodiment Construction

[0022] The current overcurrent alarm circuit of the present invention is composed of a current detection circuit, an output voltage adjustable element and a comparison circuit, and the output voltage of the output voltage adjustable element can be flexibly set through external operation. The current detection circuit is connected in series with the load that needs to detect the current. The current detection circuit provides a corresponding voltage for the first input terminal of the comparison circuit according to the current flowing through the load. The output voltage adjustable element is connected with the second input terminal of the comparison circuit, and the output voltage The adjustable element provides voltage to the second input terminal of the comparison circuit according to the actual required voltage threshold value, and the comparison circuit compares the voltages of the two input terminals, and determines the current flowing through the load according to the com...

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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...

Claims

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Application Information

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IPC IPC(8): G01R19/165G01R19/25
Inventor 高雷
Owner HUAWEI TECH CO LTD
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