buck-boost converter HIGH inductor current problem

Other Hardware General Electronics
1

I have a problem on my project. Its work but inductor is over-current. How can i fix it?

Schematic

1920×1080 138 KB

analogue analysis
(3-4s)

963×709 151 KB 

//MK


const int pot_pin = A0;           //pot.'s pin
const int feedback = A1;          //feedback's pin
int vout = 0;                     //vout
int vpot = 0;                     //vpot 
int duty = 1;                     //duty
int i=1;                          //i

void setup() {
  cli();                          // stop interrupts
  TCCR1A = 0xA2;                  //registerleri belirledik
  TCCR1B = 0x19;                  //registerleri belirledik
  TIMSK1 = 0x01 ;                 // overflow interrupt
  ICR1  = 249 ;                   // 31.25us cycle time, 32kHz PWM but 64kHz drive pulses (differential)
  OCR1A = 125-100 ;               // example U drive
  OCR1B = 125 ;
  GTCCR = 0x83 ;                  // clear and halt prescalers
  TCNT1 = 0xFFFF ;                // synchronize counters exactly.
  GTCCR = 0x00 ;                  // allow prescalers to fly
  sei();                          // allow interrupts
  pinMode(pot_pin, INPUT);
  pinMode(feedback, INPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  Serial.begin(9600);

}

ISR(TIMER1_OVF_vect){
  
 OCR1A=duty;                    //change duty here. 
 OCR1B=249-duty;
}



void loop(){
  
    readvolts();                        //read pot and output voltage
    
    while(i==1){                  //for soft start
      
      for(i=1;i<25;i++){
        duty=duty+1; 
        delay(4); 
      }
    }
    
    readvolts();
    
    if(vout < vpot){              //istenen gerilim cikis geriliminden buyuk ise calistirir--YUKSELTME

      while(vout<vpot){           //if output voltage<pot voltage increase the duty
        
        duty=duty+1;
        dutyassignation();
        delay(4+duty/10);
        
        readvolts();
      }
    }
    
    else if(vout > vpot){         
      
      while(vout>vpot){           //if output voltage>pot voltage decrease the duty
        
        
        duty=duty+1;
        dutyassignation();
        delay(4+duty/10);
        readvolts();
       
      }
    }

    delay(10);                      //delay
    
}

void dutyassignation(){
  
    if(duty>225){
      duty=225;                     //limit the duty
    }
    else if(duty<25){
      duty=25;                      //limit the duty
    }
}

void readvolts(){
    
    vpot = analogRead(pot_pin);     //pot. voltages
    
    vout = analogRead(feedback );   //output voltages
    
    if(vpot>780){                   //if pot. voltages > 3.8V (so output <-38V) vpot=3.8V vout=-38V
      vpot=780;
    }
    
}