Hi, thanks MrAL.
The incorrect diode connections were embarassing
Made the changes that you recommended. I made the primary inductors resistance 1k so as to avoid loading, i got proper 20V at the primary so i guessed that i would get the converted voltage on the secondary. The problem that i get now is that the negative half cycle of the secondary voltage is nearly non existent. Is it because i have connected the -ve output to ground? I know i need to have a ground on the secondary loop of the circuit. Thanks again.