Solar MPPT Power System - firmware/Core/Src/pwm_ref.c

by TylerK

A 30 W solar battery charger with regulated 5 V and 3.3 V rails: an STM32G031 running perturb & observe MPPT and a CC/CV charge state machine, steering a TI LM5175 4-switch buck-boost through a single analog control input. Four-layer KiCad board, schematic and PCB generated from Python, with an electrothermal simulation run against the published board file.

Overview Files Packages Releases Dependencies Issues Breadcrumbs Pull Requests Activity

main

History Download

TylerK Replace discrete-analog board with MCU/IC redesign: STM32G031 P&O MPPT + CC/CV firmware, LM5175 buck-boost, INA180 curr… e48ba30 1mo ago

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

#include "pwm_ref.h"
#include "board_config.h"
#include "main.h"   /* CubeMX-generated: htim14 handle */

void pwm_ref_init(void) {
    HAL_TIM_PWM_Start(&htim14, TIM_CHANNEL_1);
    __HAL_TIM_SET_COMPARE(&htim14, TIM_CHANNEL_1, 0);
}

void pwm_ref_set_vbatt_setpoint(float vbatt_setpoint) {
    float mcu_ref_v = vbatt_setpoint_to_mcu_ref(vbatt_setpoint);
    float duty = mcu_ref_to_pwm_duty(mcu_ref_v);

    uint32_t arr = __HAL_TIM_GET_AUTORELOAD(&htim14);
    uint32_t compare = (uint32_t)(duty * (float)(arr + 1));
    if (compare > arr) compare = arr;

    __HAL_TIM_SET_COMPARE(&htim14, TIM_CHANNEL_1, compare);
}