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First implementation of MPP tracking

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This commit is contained in:
Thomas Kolb 2016-08-07 00:36:15 +02:00
parent 97db9c24db
commit 33dea2e7a4
1 changed files with 115 additions and 19 deletions
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130
src/main.c
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@ -22,6 +22,7 @@ enum OperState {
Bootstrap,
ConvConstVoltage,
ConvConstCurrent,
ConvMPP,
Idle,
};
@ -216,6 +217,11 @@ int main(void)
fxp_t pErr, iErr = 0;
fxp_t controlAction;
fxp_t power_avg, refPower;
fxp_t testPower[2];
int32_t testPWM[2];
int testPWMStep;
fxp_t PGAIN_CV = fxp_from_float( 50.000f);
fxp_t IGAIN_CV = fxp_from_float( 0.300f);
fxp_t IERR_LIMIT = fxp_from_int(4000);
@ -228,8 +234,11 @@ int main(void)
fxp_t AVG_FACT = fxp_from_float(0.10f);
fxp_t AVG_FACT_INV = fxp_sub(fxp_from_int(1), AVG_FACT);
fxp_t maxVoltage = fxp_from_float(12.000f);
fxp_t maxCurrent = fxp_from_float( 5.000f);
fxp_t MAX_VOLTAGE = fxp_from_float(12.000f);
fxp_t MAX_CURRENT = fxp_from_float( 5.000f);
fxp_t MPP_VOLTAGE_THR = fxp_sub(MAX_VOLTAGE, fxp_from_float(0.500f));
fxp_t MPP_CURRENT_THR = fxp_sub(MAX_CURRENT, fxp_from_float(0.500f));
// Calculated values
//fxp_t VIN_SCALE = fxp_from_float(3.3f * (100 + 12.4f) / 12.4f / 4095.0f);
@ -300,7 +309,6 @@ int main(void)
fxp_right_align(number, msg, 3, '0');
lcd_send_string("L:");
lcd_send_string(msg);
lcd_send_string("m");
}
}
@ -319,6 +327,8 @@ int main(void)
vout_avg = fxp_add(fxp_mult(vout, AVG_FACT), fxp_mult(vout_avg, AVG_FACT_INV));
current_avg = fxp_add(fxp_mult(current, AVG_FACT), fxp_mult(current_avg, AVG_FACT_INV));
power_avg = fxp_mult(vout_avg, current_avg);
// Main FSM
if(timebase_ms >= 1000) {
switch(operState) {
@ -339,7 +349,7 @@ int main(void)
timer_set_oc_value(TIM1, TIM_CH_BOOTSTRAP, 0);
// calculate error values
pErr = fxp_sub(maxVoltage, vout_avg);
pErr = fxp_sub(MAX_VOLTAGE, vout_avg);
iErr = fxp_add(iErr, pErr);
// limit integral error range
@ -366,7 +376,11 @@ int main(void)
nextState = ConvConstVoltage;
}
if(current_avg > maxCurrent) {
if(time_in_state > 1000 && vout_avg < MPP_VOLTAGE_THR) {
operState = ConvMPP;
}
if(current_avg > MAX_CURRENT) {
operState = ConvConstCurrent;
}
break;
@ -376,7 +390,7 @@ int main(void)
timer_set_oc_value(TIM1, TIM_CH_BOOTSTRAP, 0);
// calculate error values
pErr = fxp_sub(maxCurrent, current_avg);
pErr = fxp_sub(MAX_CURRENT, current_avg);
iErr = fxp_add(iErr, pErr);
// limit integral error range
@ -403,11 +417,80 @@ int main(void)
nextState = ConvConstCurrent;
}
if(vout_avg > maxVoltage) {
if(time_in_state > 1000 && current_avg < MPP_CURRENT_THR) {
operState = ConvMPP;
}
if(vout_avg > MAX_VOLTAGE) {
operState = ConvConstVoltage;
}
break;
case ConvMPP:
// bootstrap off
timer_set_oc_value(TIM1, TIM_CH_BOOTSTRAP, 0);
if((time_in_state % 50) == 0) {
switch(testPWMStep) {
case 0:
case 2:
pwm = testPWM[testPWMStep/2];
timer_set_oc_value(TIM1, TIM_CH_CONV, pwm);
break;
case 1:
case 3:
testPower[testPWMStep/2] = power_avg;
break;
case 4:
if(testPower[1] > testPower[0]) {
refPower = testPower[1];
pwm = testPWM[1];
} else {
refPower = testPower[0];
pwm = testPWM[0];
}
if(pwm < (CONV_PWM_PERIOD/2) || pwm > CONV_PWM_MAX) {
pwm = 3 * CONV_PWM_PERIOD / 4;
}
timer_set_oc_value(TIM1, TIM_CH_CONV, pwm);
break;
case 5:
// power test is currently idle, but power has changed
// too much.
// -> start a new one.
testPWM[0] = pwm + 7;
testPWM[1] = pwm - 6;
testPWMStep = 0;
break;
default:
testPWMStep = 4;
break;
}
testPWMStep++;
}
if(time_in_state > 1000 && current < CURRENT_THRESHOLD) {
operState = Bootstrap;
nextState = ConvMPP;
}
if(vout_avg > MAX_VOLTAGE) {
operState = ConvConstVoltage;
}
if(current_avg > MAX_CURRENT) {
operState = ConvConstCurrent;
}
break;
case Idle:
// disable all PWMs
timer_set_oc_value(TIM1, TIM_CH_CONV, 0);
@ -426,13 +509,13 @@ int main(void)
time_in_state = 0;
lastState = operState;
lcd_set_cursor_pos(0, 7);
lcd_set_cursor_pos(0, 6);
switch(operState) {
case Idle:
lcd_send_string("ID");
lcd_send_string("IDL");
break;
case Bootstrap:
lcd_send_string("BS");
lcd_send_string("BTS");
break;
case ConvConstCurrent:
lcd_send_string("CC ");
@ -440,8 +523,11 @@ int main(void)
case ConvConstVoltage:
lcd_send_string("CV ");
break;
case ConvMPP:
lcd_send_string("MPP");
break;
default:
lcd_send_string("??");
lcd_send_string("???");
break;
}
} else {
@ -458,12 +544,6 @@ int main(void)
debug_send_string(msg);
}
debug_send_string("\r\n");
debug_send_string("State: ");
fxp_format_int((int)operState, msg);
debug_send_string(msg);
sentSomething = 1;
}
@ -483,6 +563,22 @@ int main(void)
sentSomething = 1;
}
if((timebase_ms % 500) == 200) {
debug_send_string("power_avg=");
fxp_format(power_avg, msg, 2);
debug_send_string(msg);
debug_send_string("; ref=");
fxp_format(refPower, msg, 2);
debug_send_string(msg);
debug_send_string("; pwm=");
fxp_format_int(pwm, msg);
debug_send_string(msg);
sentSomething = 1;
}
if(sentSomething) {
debug_send_string("\r\n");
sentSomething = 0;