Guru
Joined: 17/10/2017
Location: BelgiumPosts: 462
| Posted: 09:00pm 30 Mar 2024 |
Wow, didn't expected to see a nice generator, well done
Feedback will be little this moment of year, a lot of people have holidays now and many people are quit bussy finishing their own creations, lots of stuff in the pipeline.
Ok, the schematic should work, but you should power your electronics from a steady powersupply. For testing you can use a small 12V battery or psu, don't use the power the generator gives at this stage.
Do you have some mosfets? IGBT's most often need a negative bias when turning off. So, I would look for at least some 100V-150V mosfets because of the fact it is difficult to get the dc voltage stable at the moment?
Will you use those 47n60 mosfets mentioned in the schematic? Those should handle 15A just fine, but they must be mounted on a heat sink, isolated with for example mica or other pads.
Maybe look for something stronger then the 1n4448 diode, it's only 200mA. Something around 1A will be more robust.
The higher the voltage the better for those mosfets from the schematic, you can test this even without an output transformer. Use an LC filter to smooth things out, look for something around 1mH and 10uF.
Or use a transformer suitable according to your output voltage. 50VDC will give you roughly 35V AC when filtered. (there is a factor 1.41 involved, if you rule out the other losses)
Running your H bridge straight from the rectified generator voltage will not work, you will need at least some capacitance, without this you will be replacing mosfets faster then you can buy. Without some capacitance the hf pwm will create very high voltages between drain and source because of the inductance involved. I would start with at least 10000uF and a small value mkp 4,7uF in parallel for 1kW. Connect your generator for at least 3 phases that way you have small ripple on the capacitors.