smallembedded

ESP32 electronic load meter 2.0

Overview

The DC electronic load meter based on ESP32 has high-precision voltage and current measurement display, input overvoltage and overcurrent reverse connection protection, independent battery power supply, CH224K fast charging, temperature measurement, serial port download communication and other functions

Measurement : Measured by INA226 to ensure high accuracy

Constant current: The TLC2272 operational amplifier collects the alloy resistor voltage and compares the MCP4725 12-bit DAC output voltage divider to control the MOS to achieve constant current (the trick is that the DAC cannot output 0V)

Input: 7.62-2P terminal block / TYPE-C/DC5.0 three interfaces + TYPE-C interface for independent battery power supply and communication

Output: 5.0-3P terminal block (which can be output or used as a MOS expansion interface) / TYPE-C / USB-A three interfaces

Display: Using 0.96-inch TFT color screen

Heat dissipation: Use Jinbao pure copper radiator (no problem at 120W, but a little hot). Pay attention to the model.

Software: A simple program developed based on the Arduino framework. I will use it now and optimize it later when I have time.

MOS: High-power TO-247 package MOS is used. Two MOS are used for independent constant current control and more MOS can be expanded using the output 3P interface.

The maximum input voltage is 30V, the maximum input current is 20A, and the maximum input power should not exceed 120W for long-term operation (I forced water cooling to about 230W (10V23A) and then the reverse connection protection MOS started to smoke)

Can be connected to other equipment for measurement

Disadvantages: DAC cannot output 0V, MOS with low voltage and over 15A current reverse connection protection generates a lot of heat.

Design Files

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Update:2024-11-22 06:02:05

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