thyristor rectifier design to controll speed of dc motor

[Simpy Sanyal]

I AM WORKING ON HARWARE DESIGN OF FULL WAVE FULL BRIDGE SCR RECTIFIER.I AM USING THIS CODEOF ARDUINO TO GENERATE FIRING PULSES

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Code C - [expand]
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int inter=0;
int inter1=1;
double val;
double time;
double time1;
int a=0,b=0,angle;
void setup()
{
  noInterrupts();
  pinMode(9,OUTPUT);
  pinMode(10,OUTPUT);
 
  interrupts();
  attachInterrupt(inter,stateChange,RISING);
  attachInterrupt(inter1,stateChange1,FALLING);
 Serial.begin(9600);
}
 
void loop()
{
   val = analogRead(A0);
  angle=map(val, 0, 1023, 0, 180);
  Serial.println(angle);
  if (a==1)
  {val = analogRead(A0);
  val = map(val, 0, 1023, 0, 9);
  time=9-val;
  time1=val;
    digitalWrite(9,LOW);
   delay(time1);
   digitalWrite(9,HIGH);
   delay(time);
   digitalWrite(9,LOW);
   a=0;
  }
 
  if(b==1)
  {val = analogRead(A0);
  val = map(val, 0, 1023, 0, 9);
  time=9-val;
  time1=val;
    digitalWrite(10,LOW);
   delay(time1);
   digitalWrite(10,HIGH);
   delay(time);
   digitalWrite(10,LOW);
   b=0;
  }
}
 
 void stateChange()
 {
   a=1;
 }
 
   void stateChange1()
 {
   b=1;
 }

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AT PIN 9 AND 10 IAM GETTING PUSES.AND THEN IAM FEEDING IT TO TLP250.I AM GETTING 12V APPROX FROM TLP CIRCUIT.NOW THE MAIN PROBLEM IS THYRISTOR ARE NOT GETTING TRIGGERED WHILE DURING TLP CIRCUIT DESIGN I HAVE TAKEN CARE OF MIN AND MAX GATE TRIGGERING INPUT CURRENT OF THYRISTOR.I NEED HELP URGENTLY.PLEASE HELP

 

[chuckey]

Show your schematic. Are your pulses too fast for the thyristor?
Frank