first commit

buck_emulator.c

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+/*
+ * buck_emulator.c
+ *
+ *  Created on: 12 May 2025
+ *      Author: Christian Lind Vie Madsen
+ */
+
+
+typedef struct {
+    float Vin;      // Input voltage
+    float Vout;     // Output voltage
+    float IL;       // Inductor current
+    float L;        // Inductance
+    float C;        // Capacitance
+    float Rload;    // Load resistance
+    float dt;       // Time step (e.g., 25e-6)
+} BuckConverter;
+
+void simulate_step(BuckConverter *buck, float duty_cycle) {
+    float dIL = (buck->Vin * duty_cycle - buck->Vout) / buck->L;
+    buck->IL += dIL * buck->dt;
+
+    float dVout = (buck->IL - buck->Vout / buck->Rload) / buck->C;
+    buck->Vout += dVout * buck->dt;
+}
+
+/*
+int main() {
+    BuckConverter buck = {
+        .Vin = 12.0,
+        .Vout = 0.0,
+        .IL = 0.0,
+        .L = 100e-6,
+        .C = 100e-6,
+        .Rload = 10.0,
+        .dt = 25e-6
+    };
+
+    float duty_cycle = 0.5;
+    float Vref = 5.0;
+    float error, previous_error = 0, integral = 0;
+    float Kp = 0.2, Ki = 1000;
+
+    for (int i = 0; i < 40000; ++i) {
+        error = Vref - buck.Vout;
+        integral += error * buck.dt;
+
+        duty_cycle = Kp * error + Ki * integral;
+        if (duty_cycle > 1.0) duty_cycle = 1.0;
+        if (duty_cycle < 0.0) duty_cycle = 0.0;
+
+        simulate_step(&buck, duty_cycle);
+
+        // For debug:
+        if (i % 1000 == 0)
+            printf("Time: %.3f ms, Vout: %.2f V, IL: %.2f A, Duty: %.2f\n",
+                   i * buck.dt * 1000, buck.Vout, buck.IL, duty_cycle);
+    }
+
+    return 0;
+}
+ */