Detecting circuit of supply voltage

Abstract

A circuit for detecting voltage supply includes: a stabling circuit, a comparing circuit and a displaying circuit, the stabling circuit provides a stable reference voltage to the comparing circuit, the comparing circuit detects the voltage supply and the displaying circuit displays the state of the voltage supply, the circuit for detecting voltage supply also includes a timing circuit, which electronically connect the comparing circuit with the displaying circuit and can make the displaying circuit to keep on displaying the abnormal working state of the power supply. By employing the above circuit for detecting voltage supply, it can be accomplished to detect the working state of the power supply accurately and in time, easily to verify and improve the power supply in order to increase the stability of the power supply.

Description

【Technical field】 [0001] The invention relates to a power supply voltage detection circuit, in particular to a power supply voltage detection circuit capable of detecting and displaying the abnormal state of the DC power supply voltage. 【Background technique】 [0002] The stable supply of motherboard power supply voltage is the basis for the normal and stable operation of the entire computer system. With the continuous increase of the CPU frequency, the computer system has higher and higher requirements for the motherboard power supply. Especially when the CPU part of the computer performs a large number of data calculations, the required voltage and current are relatively large. At this time, if the main board cannot obtain sufficient and stable voltage and current, it is easy to cause failures such as restart or crash. [0003] In order to ensure the normal and efficient operation of the computer system, during the design process of the system motherboard, it is necessary ...

AI Technical Summary

Problems solved by technology

[0005] However, the existing power supply voltage detection circuit cannot detect the specific reasons for the occurrence of the abnormal power supply voltage

In addition, in the existing power supply voltage detection circuit technology, if the voltage is abnormal at a certain moment, the light-emitting diode will emit light; but once the cause of the failure disappears, the power supply voltage detection circuit detects that the voltage returns to a normal voltage value, The LED will automatically turn off and no longer display the previous fault

In this way, the monitoring personnel will not be able to know that the power supply voltage has been abnormal, which may easily lead to mismeasurement and misjudgment

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