Hi..
I'm having trouble undersdaning how 3 phased controlled rectification works. 6 Thyristors are used to complete the action. It's the firing sequence and theory that I cant grasp. Most places say to fire them in pairs, which means we can fire 1A and 2B(3A should be on as well), then when it is 2A's turn to fire, 2B should turn off reverse biased and 2A can be pulsed on along with 3B... Not sure if that is correct, but that means that it's not perfect rectification as 3B should have been on 30degrees earlier? That is my first issue...
Then how would actually go about deciding when to pulse each thyristor? Would you wait for zero crossing and then just hold it on for a few degrees before the thyristor latches?
I'm having trouble undersdaning how 3 phased controlled rectification works. 6 Thyristors are used to complete the action. It's the firing sequence and theory that I cant grasp. Most places say to fire them in pairs, which means we can fire 1A and 2B(3A should be on as well), then when it is 2A's turn to fire, 2B should turn off reverse biased and 2A can be pulsed on along with 3B... Not sure if that is correct, but that means that it's not perfect rectification as 3B should have been on 30degrees earlier? That is my first issue...
Then how would actually go about deciding when to pulse each thyristor? Would you wait for zero crossing and then just hold it on for a few degrees before the thyristor latches?