A quadratic buck converter with lossless commutation

High snitching frequency associated with soft commutation techniques is a n ew trend in switching converters, Following this trend, the authors present a buck pulsewidth modulation converter, where the dc voltage conversion ra tio has a quadratic dependence on duty cycle, providing a large step-down. By introducing two resonant networks, soft switching is attained, providing highly efficient operating conditions for a wide load range at high switch ing frequency, Contrary to most of the converters that apply soft-switching techniques, the switches presented are not subjected to high snitch voltag e or current stresses and, consequently, present low conduction losses, The authors present, for this converter, the principle of operation, theoretic al analysis, relevant equations, and simulation and experimental results.