Direct-current power supply detection device

Abstract

The invention discloses a DC power supply detection device, comprises a multi-stage voltage division circuit, an analog-to-digital converter and a controller, wherein the multi-stage voltage division circuit comprises at least two electronic switches, at least two by-pass resistors and a main-pass resistor, wherein a first pole of the electronic switches is connected with a first terminal of the main-pass resistor through the corresponding by-pass resistors; a second pole of the electronic switches is earthed; a second terminal of the main-pass resistor is connected with the DC power supply to be detected; the analog-to-digital converter is connected with the first terminal of the main-pass resistor; the controller is connected with the analog-to-digital converter and a third pole of the electronic switches; the controller controls the conduction of the corresponding electronic switches according to the output of the analog-to-digital converter to consequently conduct the by-pass resistors connected with the electronic switches with the earth. When the voltage provided by the DC power supply is kept in a relative small range, the DC power detection device can provide higher voltage detection accuracy.

Description

technical field [0001] The invention relates to a detection device, in particular to a detection device for detecting the output voltage of a DC power supply. Background technique [0002] Many electronic devices provide the required DC voltage from a DC power supply. The user can detect the size of the DC voltage through a DC power detection device, and judge whether the size of the DC voltage meets the requirements of the electronic equipment. Such as figure 1 As shown, the traditional DC power detection device includes a voltage divider circuit 200 , an analog-to-digital converter 300 , a reference voltage 400 and a central processing unit 500 . The voltage dividing circuit 200 is connected with the DC power supply 100 to be tested. Assume that the output voltage range of the DC power supply 100 is 0-60V, the reference voltage 400 is 4.096V, and the analog-to-digital converter 300 is a 10-bit converter. The values ​​of R10 and R20 in the voltage divider circuit make t...

AI Technical Summary

Problems solved by technology

If the output voltage of the DC power supply 100 is small, such as 20V or 5V, and the DC power supply detection device needs to have higher detection accuracy, the accuracy can be improved by increasing the number of digits of the analog-to-digital converter, However, the increase in the number of digits of the analog-to-digital converter is limited by manufacturing costs and technology

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