10 years, 8 months ago.

digital PID control help for non-inverting buck boost converter

Hello guys,

I am new to this mbed and now i am doing non inverting buck boost converter project with mbed. I need to do PID for voltage control and i am struggling with this .

first i am going to use voltage control . the process is shown in the picture .

when the circuit is produce output voltage, firstly, the voltage is scale down by using voltage divider as Mbed board can accept ( 0- 3.3) volt . than do the ADC . then gain .

my problem is i do not know how to write PID control for this circuit. here is the few line of code up to the gain point . and then i need to do comparison with reference voltage and PID control. but i do not know how to write PID control.

this circuit works as buck ,boost and buck boost according to the pwm changing. so i need to compute the PID values and then update my pid values to adjust the pwm. this is what i am struggling now. Please anyone help me with this.

1. include "mbed.h"

1. include "PID.h"

AnalogIn VoutRAW(p20);

float VoutActual;

double R1 = 920000;

double R2 = 146000; int main() {

while (1) {

VoutActual= VoutRAW*(3.3* (1066/146)); doing adc and gain.

}

}

thanks for help.