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I tried snubbers but then i realized that the problem was not at all about snubbers, strong gate drive is the reason, i modified it simply on my same pcb as in the picture and it works very fine. 100R ground resistance and capacitor make it very strong. But i got the ultimate result when i used...
Sorry there had been a mistake by me as i overlooked one thing in ur circuit which i noticed after the reply from above person. The mains is ractified in a way to get both capacitors C1 and C2 charged at full voltage ie 340V each. So the total voltage will be 680V. and half of it will drop...
First of all to test transformer u have to check the current of primary nt secondry. And without Any load on secondry. If the turns are mistuned then losses in core will draw unwanted current. That u have to check. Secondly how can u oscillate ur transformer without the mosfet?
Pic will give u...
Yes the capacitor i mentioned is Cs,
The fuse in series of primary winding on one side, this is just for the safety of MOSFETs in case any shortcircuit happens,
There is one more tip for u in this respect, instead of this fuse use a 60W filament tungsten bulb in series of primary winding. If...
You are confusing the input Line AC frequency and the MOSFET switching frequency.
Main Line frequency is 50Hz but after ractification u r left only with DC. Now after that u have to switch the MOSFETs at high frequency ie in the range of 30 to 40 KHz. And that will be the oscillating frequency...
I added RCD clamp snubber on Q1 and Q2 and testing it gave an intresting result. This time Low side IGBT broke down (twice as i conducted). Then i made the gate drive more robust without a coupling capacitor and zener protection. After that; till now its working fine......... Lets see
No equipment is required for winding a small transformer like this, u can easily do it by hands.
I have managed to calculate the volts/turn experimentally, i made a power supply from 170-240V rms to 24V DC 20A regulated. for that i spent a lot of time and finally got it 100% perfect. I made...
Just to give u an idea, for the core size and quality u r using u should wind the transformer using 4 Volts per turn at a frequency of 30KHz. For example for an input voltage of 24V u can wind the primary winding with 6 turns. And wind the secondary on the basis of simple ratio of input and...
I just had more research about snubbers. What will u suggest in this case "RCD clamp snubber" , "RCD charge discharge snubber" or simply an "RC snubber" and what can be the estimated values of R and C for 50Hz for total maximum power output of 800 W
I am trying to make a simple switch mode PWM inverter rather UPS for my own. I have completed the work and got the output but there is a problem i occasionally face that the high side IGBT breaks down. It happens occasionally not always. I even use my inverter perfectly for weeks but then...
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