Hi there,
Michelle : Its not really difficult to make 1kw offline smps. With Irfp460 will be more easy as rds-on will be more faster than irf740. also if you can get etd49 will be more great. With switching 100Khz you can get more than 1kw, add more caps bank at hi-voltage, at least 15A diode at hi-voltage. At this time i dont have pcb yet with IR2153 to go with 1kwrms power. But i can make one if u want. Just give me some time to have it done.
Abet : Ok to be clear it up, Actually i did modification with remove the output inductor. I did put 2 inductor at the second test but without them the smps will be more efficient. Because of this smps is not regulate, so inductor just make this smps will be more suffer and ineffective. I`ll take a look again with bettecher design and he already mention that the design is almost same at page 1 project. and i already mention regarding aux supply to IR2153 need to be stable or use external aux for good result. also you can see bettecher use relay to short the NTC few secs after smps power up.
regards.