一種新型的ZVS-PWM-MR Boost變換器

摘要：提出了一種基于PWM控制的ZVS Boost變換器，采用開關管的寄生電容作為諧振電容，通過多諧振在開關管開通前將其寄生電容放電，避免了開通時的電容放電造成的開通損耗。諧振前對諧振電感放電以避免諧振電流尖峰，并采用無源箝位限制諧振電壓，使得該變換器具有與傳統PWM硬開關變換器相同的電壓、電流應力。 敘詞：軟開關，Boost變換器，ZVS Abstract：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. Keyword：soft switching, Boost converter, ZVS