c_projects/buck_converter_emulator
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i think its working.. but needs verify..

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This commit is contained in:
Christian Karl Oscar Lind Vie Madsen
2025-05-25 22:23:34 +02:00
parent 5b329b710a
commit 5ff1d193c7
4 changed files with 44 additions and 13 deletions
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41
buck_emulator.c
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@@ -16,11 +16,42 @@ static int isStructOk(BuckEmulator_t *inst){
static void buck_emulator_step(BuckEmulator_t *inst, float duty_cycle) { static void buck_emulator_step(BuckEmulator_t *inst, float duty_cycle) {
float dIL = (inst->Vin * duty_cycle - inst->Vout) / inst->L; float dIL_on = 0.0f, dIL_off = 0.0f;
inst->IL += dIL * inst->dt;
float dVout = (inst->IL - inst->Vout / inst->Rload) / inst->C; // ON-phase
inst->Vout += dVout * inst->dt; if (duty_cycle > 0.0f) {
float V_L_on = inst->Vin - inst->Vout;
dIL_on = (V_L_on / inst->L) * (duty_cycle * inst->dt);
}
// OFF-phase
float V_L_off = 0.0f;
if ((inst->IL + dIL_on) > 0.0f) {
V_L_off = -inst->Vout; // Diode conducts
dIL_off = (V_L_off / inst->L) * ((1.0f - duty_cycle) * inst->dt);
} else {
dIL_off = 0.0f;
}
// Total inductor current update
inst->IL += dIL_on + dIL_off;
if (inst->IL < 0.0f) inst->IL = 0.0f;
// Capacitor current
float capCurrent = inst->IL - inst->Vout / inst->Rload;
// Diode blocking check
if (inst->IL == 0.0f && capCurrent < 0.0f) {
capCurrent = 0.0f;
}
// Vout update
float dVout = capCurrent / inst->C;
inst->Vout += dVout * inst->dt;
// Clamp Vout
if (inst->Vout < 0.0f) inst->Vout = 0.0f;
if (inst->Vout > inst->Vin) inst->Vout = inst->Vin;
return; return;
} }
@@ -86,6 +117,6 @@ int buck_emulator_init(BuckEmulator_t *inst, float Vin, float L, float C, float
inst->simTime = sim_time; inst->simTime = sim_time;
return 0;
} }

8
buck_specs.h
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@@ -14,8 +14,8 @@
// Component Values: // Component Values:
#define L_INDUCTOR 100e-6 // Henry #define L_INDUCTOR 68e-6 // Henry
#define C_CAPACITOR 100e-6 // Farad #define C_CAPACITOR 10e-6 // Farad
// Sample time // Sample time
@@ -23,10 +23,10 @@
// Load // Load
#define R_LOAD 100 // Ohm #define R_LOAD 10 // Ohm
// Simulation parameters // Simulation parameters
#define SIMULATION_TIME 1.0 // Seconds #define SIMULATION_TIME 0.6 // Seconds
// Plot specific // Plot specific

4
main.c
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@@ -14,8 +14,8 @@
BuckEmulator_t buck_converter; BuckEmulator_t buck_converter;
cm_pid_regulator_float_t Voltreg; cm_pid_regulator_float_t Voltreg;
float kp = 0.00075; float kp = 0.00550;
float ki = 0.00001; float ki = 1.0;
float kd = 0.0; float kd = 0.0;

4
plotscript/python_csv_plotter.py
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@@ -49,7 +49,7 @@ with open(sys.argv[1], newline='') as csvfile:
# Begin plotting # Begin plotting
fig1, ax1 = plt.subplots() fig1, ax1 = plt.subplots()
fig1.canvas.manager.set_window_title('DVT-Light Python Plotter V1.1') fig1.canvas.manager.set_window_title('OZ1CM Python Plotter V1.1')
fig1.suptitle(plot_title) fig1.suptitle(plot_title)
# Plot Vout # Plot Vout
@@ -59,7 +59,7 @@ ax1.set_ylabel('Vout', color=color)
ax1.plot(time_array, temperature_array, color=color, label='Vout') ax1.plot(time_array, temperature_array, color=color, label='Vout')
ax1.tick_params(axis='y', labelcolor=color) ax1.tick_params(axis='y', labelcolor=color)
ax1.set_ylim(min_temp, max_temp + temperature_end_offset) ax1.set_ylim(min_temp, max_temp + temperature_end_offset)
ax1.set_yticks(np.arange(min_temp, max_temp + temperature_end_offset, step=10)) ax1.set_yticks(np.arange(min_temp, max_temp + temperature_end_offset, step=1.0))
ax1.grid(True) ax1.grid(True)
# Plot Power (2nd y-axis) # Plot Power (2nd y-axis)