TIMER VALUE TO ANGLE for POWER FACTOR METER:

[karan123]

Hello All,

I am working on Project of Measurement of Power factor with PIC18F4520 MCU with External

Crystal Osc 4 MHz and MPLAB XC8. [Capture mode, every rising edge]

My Voltage ZCD and Current ZCD are working fine as checked on CRO.

Can any body give me given how to convert

Time value to cos (phi) in C. I am doing as below:

void Capture_init() 
{ 

/* 
                    CCPxM3:CCPxM0
                    [B]0101= Capture mode, every rising edge[/B]
*/
			CCP1CON=0x05; 
			CCP2CON=0x05; 
/*
                        bit 5-4 T1CKPS1:T1CKPS0:Timer1 Input Clock Prescale Select bits
                            [B]  11= 1:8 Prescale value[/B]
                        bit 2 T1SYNC:Timer1 External Clock Input Synchronization Select bit
                            [B] When TMR1CS = 1:[/B]
*/
			T1CON=0x34; 
			TMR1H=0; 
			TMR1L=0; 
   	                 while(1) 
			{ 
					for(i=0;i<10;i++) 
					{ 
							CCP2IF=0; 
							while(CCP2IF==0); 
							TMR1ON=1; 
							CCP1IF=0; 
							while(CCP1IF==0); 
							TMR1ON=0; 
							time=CCPR1H; 
							time=(time<<8)+CCPR1L; 
							avg=avg+time; 
					} 
					avg=avg/10; 	
					cmd(0xC0) ;
					printf("%d",avg);  // Display
                                       [B] // Clear Variable to Next Round[/B]
	                                TMR1H=0; 
					TMR1L=0; 
					TMR1IF=0;avg=0; 
                         }
}