Quote Originally Posted by sougata View Post
4. Please note that keep your high-side MOSFETs turned on during the entire cycle and apply PWM to the low side MOSFET. Initially I tried steering the PWMs to all of the four MOSFETs to make up for the conduction switching loss. But it did not produce satisfactory results.
Hi Charles,

Your system was essentially a double conversion system. Although it has two power stages but the sinewave regulation becomes real easy when you have your DC bus regulated. I had my original design of the DC boost using a SG3525 followed by a PIC driving MOSFETs to produce the sinewave. Now I am trying to utilize a dsPIC (I am in the process of learning it and still a Newbie ) to handle both the conversions as well as battery charging on mains availability. My knowledge in SMPS is very limited till date and I am working hard for those "gotchas". So wish me luck. (I need it for keeping the number of toasted MOSFET/Chopper low, obtained during trial phase)