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triac gate question

 
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whung.john
Guest
triac gate question
PostPosted: Tue Sep 18, 2007 5:27 am     Reply with quote
hi my friends, how are u .
i try to write a control AC fan program.
but i put key(pin_b1) and the ac fan have operate.
i put other key (pin_b3) and ac fan not turn speed.
fan motor turn not smooth in slow and fast.
PLEASE TELL ME WHAT ERROR AND HOW TO MODIFY
THANKS U VERY MUCH
AC fan is 110V AC AND 60hz.
1/60hz=16.67ms 16.67/2=8.335ms
the theread follow as:

Code:


#include <16F73.h>
#FUSES NOWDT, XT, NOPUT, NOPROTECT, NOBROWNOUT
#use delay(clock=4000000)

BYTE dczero_flag=0;
BYTE  control_motorkey=0;
unsigned int dcspeed;


#INT_TIMER0
void timer0_isr(void)
{
   int16 dc_count;

      output_high(pin_a1);  //the triac can active and my u pin_a1 pin
       set_timer0(255);
       if (DC_count++==dcspeed)   
           {             
             output_low(pin_a1);//the triac NO active and my u pin_a1 pin
             dc_count=0;
             control_motorkey=1;
             dczero_flag=1;
             disable_interrupts(INT_timer0);
          }           
}               
           
void main()
{
  while(1)
 {
   if (!input(pin_b1))  //SET on AC FAN
      {
          control_motorkey=1;
          dczero_flag=1;
          dcspeed=8000; //first fan speed is slower
     }
   
    if (!input(pin_b2))  //SET off AC FAN
      {
          control_motorkey=0;
          dczero_flag=0;
          disable_interrupts(INT_timer0);
     }
 
      if (!input(pin_b3))  //SET AC FAN fast
       {
          control_motorkey=1;
          dczero_flag=1;
          dcspeed=6000; //first fan speed is fast
     }

   if ((input(PIN_A4))&& (control_motorkey==1)&&(dczero_flag==1))
     //find zero point
       {
        dczero_flag=0;
        control_motorkey=0;
        enable_interrupts(INT_timer0);         
          }
}
}

ckielstra



Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

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PostPosted: Tue Sep 18, 2007 6:07 am     Reply with quote
Code:
          dcspeed=8000; //first fan speed is slower
dcspeed is an 8 bit integer and can't hold these large values. Change to an int16.

Code:
   int16 dc_count;
Declared like this the variable will loose it's value on exiting the interrupt. Declare it static if you want to keep the value.

Code:
      set_timer0(255);
Why do you do this? If timer0 is running in 8 bit mode it will fire again before you have time to exit the interrupt handler.

- Where is your setup code for timer0?
- Your interrupt is not working because you never call enable_interrupts(GLOBAL).
- dccount is never initialized.
- It's nice to disable the TRIAC at program startup.
- Your off-switch will not stop the motor when the TRIAC timer is still counting.

I might have missed an error...
Guest
PostPosted: Tue Sep 18, 2007 6:52 am     Reply with quote
I don't see how your zero crossing detection works, not enough description. You need to start counting at the zero crossing to be consistent.

I set an external interupt to fire at the zero crossing by sampling the line voltage with a large resistor in series with the input pin clamped by a diode. Then reset the timer count on high to low transitions.

Microchip has an app note on this method. The only difference in my application was I used an opto-isolator between the line(120V.ac) and the pic.
whung.john
Guest
lose some code in program
PostPosted: Wed Sep 19, 2007 10:20 am     Reply with quote
ckielstra wrote:
Code:
          dcspeed=8000; //first fan speed is slower
dcspeed is an 8 bit integer and can't hold these large values. Change to an int16.

Code:
   int16 dc_count;
Declared like this the variable will loose it's value on exiting the interrupt. Declare it static if you want to keep the value.

Code:
      set_timer0(255);
Why do you do this? If timer0 is running in 8 bit mode it will fire again before you have time to exit the interrupt handler.

- Where is your setup code for timer0?
- Your interrupt is not working because you never call enable_interrupts(GLOBAL).
- dccount is never initialized.
- It's nice to disable the TRIAC at program startup.
- Your off-switch will not stop the motor when the TRIAC timer is still counting.

I might have missed an error...



hi .Ckielstra
in my program lose post some code.
so i post apain
follow as : Crying or Very sad

Code:

void main()
{
 setup_counters( RTCC_INTERNAL, RTCC_DIV_1);
 disable_interrupts(INT_timer0); //first,let timer0 no operate,wait for other command 
 enable_interrupts(GLOBAL);

  while(1)
 {
   if (!input(pin_b1))  //SET on AC FAN
      {
          control_motorkey=1;
          dczero_flag=1;
          dcspeed=8000; //first fan speed is slower
     }
   
    if (!input(pin_b2))  //SET off AC FAN
      {
          control_motorkey=0;
          dczero_flag=0;
          disable_interrupts(INT_timer0);
     }
 
      if (!input(pin_b3))  //SET AC FAN fast
       {
          control_motorkey=1;
          dczero_flag=1;
          dcspeed=6000; //first fan speed is fast
     }

   if ((input(PIN_A4))&& (control_motorkey==1)&&(dczero_flag==1))
     //find zero point
       {
        dczero_flag=0;
        control_motorkey=0;
        enable_interrupts(INT_timer0);         
          }
}
}


i have write a small program again.
and test ac motor can operate and can operate smooth.
ac motor ouput voltage is 100V.
in my old program ,where has some bug ?
let the motor can't operate smooth.
please teach me ,thanks u very
follow as :

Code:

#include <16F73.h>
#FUSES NOWDT, XT, NOPUT, NOPROTECT, NOBROWNOUT
#use delay(clock=4000000)

void main()
{
 while(1)
 {
   if (input(PIN_A4))
     {
       delay_us(7200);   //delay_us(7200) fast,delay_ms(8320) slow
       output_high(pin_a1);
       delay_us(400); //delay_us(400) is fast set,delay_us(0) is slow
       output_low(pin_a1);
       delay_us(200); //delay_us(200) is fast set,delay_us(0) is slow
       }
  }
}
WHUNG.JOHN
Guest
hardware set
PostPosted: Wed Sep 19, 2007 10:32 am     Reply with quote
Anonymous wrote:
I don't see how your zero crossing detection works, not enough description. You need to start counting at the zero crossing to be consistent.

I set an external interupt to fire at the zero crossing by sampling the line voltage with a large resistor in series with the input pin clamped by a diode. Then reset the timer count on high to low transitions.

Microchip has an app note on this method. The only difference in my application was I used an opto-isolator between the line(120V.ac) and the pic.


my friend. guest
u teach set an external interupt to fire at the zero crossing by sampling the line voltage with a large resistor in series with the input pin clamped by a diode.
my hareware ready have addtion electric parts.
and i send to my electric friends to confirm hareware no error.
he say my software maybe have bugs.
because he dont understand software .
so i must help from other.
thanks u very much . and send a good information for me.
can u find other my code bug again?
wait for u solve .thnks u again.
good nignt.
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