PIC16F690 in Half-Bridge mode

Mithun_K_Das · Feb 10, 2013

I'm using PIC16F690 to drive a Half-Bridge. So far, I've generated the pulses with death time delay. But can't find any option to control the operating frequency and duty cycle. Can anyone help me in this case?

Tahmid · Feb 11, 2013

For Half Bridge mode, you use the CCP1 module and control through the CCP1CON register. The frequency is set by PR2. The duty cycle is set by CCPR1L.

Hope this helps.
Tahmid.

Mithun_K_Das · Feb 13, 2013

Thank you Tahmid. I did this program to check it.

Code:

int i;
void main() 
{
 TRISC = 0x00; // all out
 PR2 = 0x65; // clock frequency 19.61KHz
 CCP1CON = 0b10001101;
 PWM1CON = 0b10000111;

 while(1)
 {
   for(i=-5;i<86;i++)
   {
    CCPR1L = i;
    Delay_ms(20);
   }
   Delay_ms(500);
   for(i=86;i>-5;i--)
   {
    CCPR1L = i;
    Delay_ms(20);
   }
   Delay_ms(500);
 }
}

I found that frequency is changing with duty cycle. Why?

PIC16F690 in Half-Bridge mode

Mithun_K_Das

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Tahmid

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Mithun_K_Das

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PIC16F690 in Half-Bridge mode

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