THREE PHASE DETECTOR /PHASE FAILURE

[Dhananjaya]

Dear Sir/Madam please give any idea/concept for AC Phase detecting either Present/Absent (Logic 1/0)without converting DC volt to detect TTL PIC16F676 microcontroller someone already implemented this products but know i am also implementing  this concept on same circuits but I have dont know the logic/ C code for this know I am tried as follows but still i cant  able to detecting phase

 

three phase (RY & AC analog inputs directly connected microcontroller pin without converting DC volts / reduced the voltage by using resistor divider circuit  series with of 2.2Mohm 0.5watt+5Mohm 0.25watt connected to microcontroller(PIC16F676 pins RA0,RA1 & RA2). and internal oscillator like

 

#define _XTAl_FREQ 4000000

__CONFIG(0x3FF4)

#define R_phase RA0

#define Y_phase RA1

#define B_phase RA2

 

#define Three_phase_LED RC0

#define Two_phase_LED RC1

#define Single_phase_LED RC2

#define NO_phase_LED RC3

 

char phaseRflag = 0;  // flag variables for each phase

char phaseYflag = 0;

char phaseBflag = 0;

 

char single_phase_flag = 0;  // used for single phase detection test

 

unsigned int sample = 0; // used to set "for loop" duration

 

void main()

{

  CMCON=0x07;

  ANSEL=0x00; 

  TRISA =0b001111;

  PORTA=0b001111;

  TRISC=0b000000;

  PORTC=0b00000;

 

  while(1) // while loop to test phases continously

    {

    phaseRflag = 0;  // phase flags are set to zero

    phaseYflag = 0;

    phaseBflag = 0;

   

   // a "for loop" tests the inputs for 20 milliseconds, setting a flag if a logic 1 is read

 

    for(sample = 16000; sample > 0; sample–)  // test all phases for at least 20 milliseconds

        {

        if(R_phase)        // if a 1 is detected on a phase set a flag to 1;

           phaseRflag = 1;

        if(Y_phase)

           phaseYflag = 1;   

        if(B_phase)

           phaseBflag = 1; 

        }                          // end of the  for loop   

 

    // phase tests running as before, except now looking at the flag settings

    // test for all phases on

---

  

    if(phaseRflag && phaseYflag && phaseBflag) 

       Three_phase_LED = 1;  // RC0 pin connected(Three_phase) LED will Glow ON

    else

       Three_phase_LED = 0;

 

    // test for phase R and B on

---

 

    if(phaseRflag && phaseBflag && !phaseYflag)

        Two_phase_LED = 1;    // RC1 pin connected(Two_phase) LED will Glow ON

    else

        Two_phase_LED = 0; 

 

    // test for a single phase on

---

 

 

    single_phase_flag = 0;  // set if only a single phase was detected

 

    if(phaseRflag || !phaseYflag || !phaseBflag)  // only R_phase is on

         single_phase_flag = 1;  

   

    if(!phaseRflag || phaseYflag || !phaseBflag)  // only Y_phase is on

         single_phase_flag = 1; 

   

    if(!phaseRflag || !phaseYflag || phaseBflag)  // only B_phase is on

         single_phase_flag = 1; 

   

    if(single_phase_flag == 1)   // if  a single phase was detected

         Single_phase_LED = 1;   // RC2 pin connected(Single_phase) LED will Glow ON

    else

         Single_phase_LED = 0;   // single phase LED off

    

    // test for no phases on

---

   

    if(!phaseRflag && !phaseYflag && !phaseBflag)

       NO_phase_LED = 1;    // RC3 pin connected(No_phase) LED will Glow On    

    else

       NO_phase_LED = 0;

   }   // end of while loop

}      // end of main

 

 

In this pregame only  

       NO_phase_LED = 1;    LED is On  always….  

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