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.