Hello guys, I have been working on this project for some time now,
Can you tell me if something is very wrong with this, or if I should add something
I have already tested it, and it works as expected with an incandescent light bulb, I can dim it beautifully, but the next step involves connecting a welding transformer...
I am especially interested in the recommended current rating for those flyback diodes on the bridge.
Expected load is 220v, 2,5kVA, cosfi 0,66-0,7 welding transformer.
Should I scope the thing before proceeding, I have no oscilloscope at the moment...
I didn't copy this thing, its my original design in initial stages.
An UNO board controls it by pulsing first and second half-period on 2 channels for now so fire 1 and 4 are technically shorted, also 2 and 3.
Don't worry about the pin load as the arduino doesn't interact with the gate driver directly, there is a third board under development that deals with logic power supply, error checking, drive channels, relay control, and arduino to circuit communication, because I wanted to be able to block drive signals on error.
I could put a diode and a discharge resistor anti parallel to gate resistor, but at 10kHz this seems insignificant.
I used short custom made coax cinch cables to connect these two boards
sry the input filter was drawn poorly, it is completely before the rectifier, it exists but disregard it in this schematic....
perhaps I should add something(transil dode with some resistance?) after the fuse between the caps and the bridge so the bridge dosen't blow from reverse voltage/current if the fuse blows, or am I safer without that fuse... I ment it as protection from caps if the bridge somehow gets shorted...