$3.$ In a Flyback converter, $!"=30,!=9,!=30$ and $!=15$ turns. The self$-$inductance of

winding $1$ is $50$ and $!=200.$

a$)$ Calculate the critical power, which makes this converter operate at the border of

incomplete and complete demagnetization modes $($where current and flux are zero$).$

b$)$ If the Flyback converter is operated in the complete demagnetizing mode, derive the

relationship between input and output voltage $(!!")$ in terms of circuit parameters.