黄土马家

30V3A micro electronic load (with current display)

Overview

TL431 and the resistor potentiometer generate a reference, allowing the 358 to drive the N-channel MOS to conduct, producing a voltage drop on the 1W chip 0.1 ohm resistor, and controlling the current after feedback. ( analog control constant current )

358 amplifies the voltage signal ten times to the ADC of CH552G (8bitadc, current resolution 0.02A ) (the silk screen resistor is 1K* 10k*, the higher the accuracy, the better), and obtains the accurate voltage value through the external 2.5V reference, which is converted into a current value. Drive digital tube display.

Please note that the program provides HEX files.

The first download can be downloaded by default. Please put the download configuration pin on P1.5 in the download software , otherwise it will always enter the download state.

When using, please ensure that USB is the power supply line, and D+ D- is not pulled up or pulled down for short circuit (the phenomenon is that the segment code of the digital tube is incorrect)

90W has not been tested, remember to dissipate heat! Remember to dissipate heat! Remember to dissipate heat!

20.09.23

New description: ①The digital tube is a common yang.

②Part of the key points are marked in red

2021.8.6

Add physical video link: https://www.bilibili.com/video/BV17J411p7sn/

Design Files

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Update:2025-05-08 21:16:58

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