Please help me to Design inverter for ballast electronic

My name is Rahmat Akmal Jaspa, you can call me Rahmat. I come from Indonesia. This time I study at one of university in west sumatra ( Indonesia ), precisely in Bung Hatta University. In this time I was finishing my final duty concerning electronic ballast, I was difficulty to design part of this ballast inverter. Do you can assist me to design its block? This ballast designed with capacities 200 watt, how to design this block , calculation and sample form this blok circuit. Thanks, if you want to help me