toothache

Based on LM3478 CNC power supply

Overview

Required
input voltage: 18VOutput
voltage range: 25V-30VMaximum
output current: 1.5AActual
parametersInput
voltage: 18VOutput
voltage range: 24V-40V (the actual output range can be largerPower

supply ripple: 240mV (80mV ripple was measured when the output was 36V)

Power supply efficiency: 94%
The hardware circuit uses INA180 for current sampling and SC8002B as the speaker driver (used for alarm)
CNC is realized through a MOS tube. MOS pulls down a current, changes the voltage at the Fb end, and the microcontroller outputs a PWM, obtains a DAC value through RC filtering, and then controls the width of the MOS conduction channel through the MCP6002 output.
The program uses PID closed-loop control to realize the button setting of the output voltage value, with a step of about 0.5V.
During the test, in order to improve efficiency, LM2596 was not used to step down the voltage to power the microcontroller.
The design is a bit sloppy, and I hope the big guys will criticize and correct it! !

Design Files

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Update:2025-05-09 08:41:59

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