universal_components/cm_heatsink_emulator
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Added fan support, but calculation still needs to be verified!

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This commit is contained in:
Christian Lind Vie Madsen
2025-10-14 14:25:20 +02:00
parent f8451ba27c
commit aaeb82d199
2 changed files with 33 additions and 7 deletions
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32
cm_heatsink_emulator.c
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@@ -18,10 +18,30 @@ static int isStructOk(cm_heatsinkEmul_t *inst){
}
static float deltaTempElement(cm_heatsink_thermalElement_t *element, float temperature, float power){
static float deltaTempElement(cm_heatsink_thermalElement_t *element, float temperature, float power, float fan_speed){
// Kelvin = Watt * K/W
return (power * element->R_th);
if((fan_speed > 0.0) && (fan_speed <= 1.0)){
float dtemp = element->R_th_MaxFan - element->R_th_MinFan;
return power * (element->R_th_MinFan + (dtemp * fan_speed));
}else{
// Kelvin = Watt * K/W
return (power * element->R_th);
}
}
static float updateCthFromFan(cm_heatsink_thermalElement_t *element, float fan_speed){
if((fan_speed > 0.0) && (fan_speed <= 1.0)){
float dc = element->C_th_MaxFan - element->C_th_MinFan;
return (element->C_th_MinFan + (dc * fan_speed));
}else{
return element->C_th;
}
}
@@ -34,11 +54,12 @@ int cm_heatsinkEmul_iterate(cm_heatsinkEmul_t *inst, float dtime){
for(int i = (inst->thermalElements_Counts-1); i >= 0; i--){
// Calculate temperature until we reach requested element!
dtemp += deltaTempElement(&inst->thermalElements[i], dtemp, inst->power);
dtemp += deltaTempElement(&inst->thermalElements[i], dtemp, inst->power, inst->fan_speed);
float C_th = updateCthFromFan(&inst->thermalElements[i], inst->fan_speed);
// Do so the temperature has the responsetime as the heatsink.
inst->thermalElements[i].temperature = inst->thermalElements[i].temperature + (1.0 / inst->C_th) * (dtemp - inst->thermalElements[i].temperature) * dtime;
inst->thermalElements[i].temperature = inst->thermalElements[i].temperature + (1.0 / C_th) * (dtemp - inst->thermalElements[i].temperature) * dtime;
}
return 0;
@@ -70,7 +91,6 @@ int cm_heatsinkEmul_init(cm_heatsinkEmul_t *inst, cm_heatsink_thermalElement_t *
inst->power = power;
inst->ambientTemp = ambientTemp;
inst->C_th = C_th;
// Dynamic values
inst->fan_speed = 0;

8
cm_heatsink_emulator.h
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@@ -18,6 +18,13 @@ typedef struct {
};
float R_th_MaxFan; // In case you need to emulate a fan
union{
float C_th;
float C_th_MinFan;
};
float C_th_MaxFan;
// Dynamic
float temperature;
@@ -30,7 +37,6 @@ typedef struct {
float power;
float ambientTemp;
float C_th; // Thermal capacity
// Dynamic
float prev_time;