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How to code a dead band of 10us in Arduino?

Former Member

Hello all!

I am trying to run an H-bridge Inverter using Arduino. I am generating PWM pulses through Arduino and using IR2110, I am feeding those pulses to the switches. My problem is, I want to add dead band of 10us in programming it self. I want to generate 4 PWM signals A,B,C and D where A and B will have a deadband. C will be a complimentary wave of A and D will be  complimentary wave for B.
But I am not able to get this deadband by putting  " delaymicroseconds(10); " code.

 

Please help me out for this.

Thanks.

Palash

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  • 0

    Thank you all for the help!

    I have found the solution.

    Here is the code which generates PWM for 4 switches with deadband:

    ============================================================================

    double pi=3.14159;

    float t=0.0;

    double ws=314.159265;

    double wt=12566.37061;

    double s=0;

    double tri=0;

    int pwm=5;

    int pwm1=6;

    int pwm2=3;

    int pwm3=11;

     

     

    void setup()

    {

      pinMode(pwm,OUTPUT);

      pinMode(pwm1,OUTPUT);

      pinMode(pwm2,OUTPUT);

      pinMode(pwm3,OUTPUT);

    }

     

     

    void loop()

    {

      s=0.8*sin(ws*t);

      double k=8/(pi*pi);

      tri=k*(sin(wt*t)-((1/9)*sin(3*wt*t))+((1/25)*sin(5*wt*t)));

     

      if(s>tri)

      {

        delayMicroseconds(2.5);

        digitalWrite(6,LOW);

        digitalWrite(11,LOW);

        delayMicroseconds(2.5);

        digitalWrite(5,HIGH);

        digitalWrite(3,HIGH);

      }

      else

      {

        delayMicroseconds(2.5);

        digitalWrite(5,LOW);

        digitalWrite(3,LOW);

        delayMicroseconds(2.5);

        digitalWrite(6,HIGH);

        digitalWrite(11,HIGH);

         

    }

     

      //digitalwrite(5,~pwm);

      t=t+0.0031847;

    }

     

    And the output waveform of the inverter:

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    Any suggestions ?

     

    Thanks,

    Palash

  • 0 in reply to Former Member

    how i can change the tri frequency?

     

     

    i need tri frequency 5KHZ.  How i can change ?

     

    ///////

    double pi=3.14159;

    float t=0.0;

    double wt=31415.9265;

    double vcon=0;

    double s=0;

    double s1=0;

     

     

    double tri=0;

     

    int pwm=5;

     

    int pwm1=6;

     

    int pwm2=3;

     

    int pwm3=11;

    char d;

     

    void setup()

     

    {

      Serial.begin(9600);

     

      pinMode(pwm,OUTPUT);

     

      pinMode(pwm1,OUTPUT);

     

      pinMode(pwm2,OUTPUT);

     

      pinMode(pwm3,OUTPUT);

     

    }

    void loop()

     

    {

     

      vcon=0.8;

      s=vcon;

      s1=-s;

     

      double k=10/(pi*pi);

     

      tri=k*(sin(wt*t)-((1/9)*sin(3*wt*t))+((1/25)*sin(5*wt*t))-((1/49)*sin(7*wt*t))+((1/81)*sin(9*wt*t)));

     

     

      if(s>tri&s1>tri)

     

      {

        delayMicroseconds(3);

     

        digitalWrite(5,HIGH);   //1

     

        digitalWrite(3,HIGH);   //2

      

        delayMicroseconds(3);

     

        digitalWrite(6,LOW);  //not 1

     

        digitalWrite(11,LOW);  // not 2

     

     

     

      }

     

      else if(s>tri & s1<tri)

     

      {

     

        delayMicroseconds(3);

     

        digitalWrite(5,HIGH);

     

        digitalWrite(3,LOW);

     

        delayMicroseconds(3);

     

        digitalWrite(6,LOW);

     

        digitalWrite(11,HIGH);

     

    }

      else if (s<tri & s1>tri)

    {

        delayMicroseconds(3);

     

        digitalWrite(5,LOW);

     

        digitalWrite(3,HIGH);

     

        delayMicroseconds(3);

     

        digitalWrite(6,HIGH);

     

        digitalWrite(11,LOW);

      

      

      

    }

    else if (s<tri & s1<tri)

      {

        delayMicroseconds(3);

     

        digitalWrite(5,LOW);

     

        digitalWrite(3,LOW);

     

        delayMicroseconds(3);

     

        digitalWrite(6,HIGH);

     

        digitalWrite(11,HIGH);

       

      }

     

      t=t+0.00031787;

     

    }

     

    Thank,

    Perasak

  • 0 in reply to Former Member

    Look at this   tri=k*(sin(wt*t)-((1/9)*sin(3*wt*t))+((1/25)*sin(5*wt*t))-((1/49)*sin(7*wt*t))+((1/81)*sin(9*wt*t))); You need to calculate a sine wave at the correct frequency of 5Hz.

  • 0 in reply to clem57

    Hi all,  I'm new to Arduino and I have not used a H block before but understand how it operates.  What I don't understand is the dead band.  What is that used for? Thanks for replies. 

  • 0 in reply to dmaruska

    From memory, not a data sheet

     

     

     

    It is the transition time where both upper and lower drivers are off,

     

    without this there is a risk that a momentary shorting path will exist as an upper driver and a lower driver on the same side are transitioning together and provide a direct path from the + Rail to the – Rail (Not through the motor) for a brief time

     

    By having a dead band between turning off the currently conducting drivers and turning on the next pair, it allows the turning off pair to actually turn off before the new ones are on (There not instantaneous as much as we would like them to be)

     

     

     

    I hope I explained that ok

     

     

     

    Peter

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