By simplifying the 4th order equation, we can obtain the value of the resonant frequency (fo) and by substituting this value in eqn. \ref{eq15} for an assumed resonant capacitor value such as Cr=0.1µF we can obtain the value of the quality factor, which is useful in finding (Lr) as\(\begin{equation}\label{eq17} L_r=\frac{QR_e}{2 \pi f_o} \end{equation}\)Where Q is the quality factor of the converter, Re is the effective load resistance, fo is the resonant frequency and fs is the switching frequency.