一种新型的ZVS PWM MR Boost变换器

本文提出了一种基于PWM控制的ZVS Boost变换器,采用开关管的寄生电容作为谐振电容,通过多谐振在开关管开通前将其寄生电容放电,避免了开通时电容放电造成的开通损耗。谐振前对谐振电感放电以避免谐振电流尖峰,并采用无源箝位技术限制谐振电压,使得该变换器具有与传统PWM硬开关变换器相同的电压、电流应力。

A Novel ZVS PWM MR Boost Converter

A Boost converter based on the PWM control strategy is proposed. By using the parasitic capacitances of the active switches as resonant capacitors,and discharging these capacitors before the active switches turn on,capacitive turn-on losses are avoided. The resonant inductor is discharged before the resonant stage takes place,and the resonant voltage peek is clamped by reactive diodes, thus making this converter be subjected to the same voltage and current stress as there counterparts in conventional hard-switching converters.