Gokkul55
Computer
- Mar 1, 2013
- 44
Dear Members
I am currently designing a static switch driver circuit (for thyristor based switch) for 1phase and 3phase AC supply. The same circuit will work for 1phase if jumper is not set and will work for 3phase if jumper is set.
The help i need is in switching off the thyristor. There are 6 thyristors 3 for primary source and 3 for secondary source
primary source -- UPS with battery backup
Secondary source -- Grid
This static switch is the device that will be placed inside the UPS.
Consider 1Phase operation.
Here i switch on the primary thyristor (only one - as it is 1phase), and check zero crossing of primary supply to sense supply failure. On supply failure i switch will switch on the secondary supply.
But the switch being a thyristor it will switch off only on current being zero, and this equipment will be used in industrial area so the load would mostly be inductive can also be capacitive. So the load current can lead or lag the AC voltage.
My plan right now is to insert a delay between the two thyristor switching (delay equal to about 300 degree in angle). Is there any other reliable method to safely switch thyristors. I want the transfer time to be minimum as possible, so that computers wont reset.
Once 1phase is done, need to do the same with 3 phase.
Help appreciated
Thanks
Regards
Gokkul
I am currently designing a static switch driver circuit (for thyristor based switch) for 1phase and 3phase AC supply. The same circuit will work for 1phase if jumper is not set and will work for 3phase if jumper is set.
The help i need is in switching off the thyristor. There are 6 thyristors 3 for primary source and 3 for secondary source
primary source -- UPS with battery backup
Secondary source -- Grid
This static switch is the device that will be placed inside the UPS.
Consider 1Phase operation.
Here i switch on the primary thyristor (only one - as it is 1phase), and check zero crossing of primary supply to sense supply failure. On supply failure i switch will switch on the secondary supply.
But the switch being a thyristor it will switch off only on current being zero, and this equipment will be used in industrial area so the load would mostly be inductive can also be capacitive. So the load current can lead or lag the AC voltage.
My plan right now is to insert a delay between the two thyristor switching (delay equal to about 300 degree in angle). Is there any other reliable method to safely switch thyristors. I want the transfer time to be minimum as possible, so that computers wont reset.
Once 1phase is done, need to do the same with 3 phase.
Help appreciated
Thanks
Regards
Gokkul