thyristor based AC-AC voltage regulator for inductive load....
its also called as a Hard firing technique for Thyristor..

i have spend almost a week for this.. there was a problem in synchronization between zero crossing and thyristor gate pulse(i.e G1&G2) & its resolved by this logic
at zero crosover i toggle a bit and take bit as a reference for G1&G2 generation
this is not a code.. i am sharing logic...


void interrupt Input_capture(void) { //Zero Crossover both edge rising&falling
Bit0 =~ Bit0; // toggle bit for each rising &falling edge trigger
sync_time=TCON; // for synchronization
OC1 = sync_time + alpha; // load value in Comapator1 register

}

void interrupt Output_Compare1(void) {
unsigned short pulse;
if(Bit0 ==1) { // check condition of toggle bit
PA1 = 0; // Thyristor Gate pulse G1
} else {
PA2 =0; // Thyristor Gate pulse G2
}
OC2 = sync_time + pulse; // load value in Comapator2 register
}

void interrupt Output_Compare2(void) {
if(Bit0 ==1) { // check condition of toggle bit
PA1 = 1; // Thyristor Gate pulse G1
OC1 = sync_time + 10000; // load value in Comapator1 register
} else { // Thyristor Gate pulse G2
PA2 = 1;
OC1 = sync_time + 10000; // load value in Comapator1 register
}
}