Sneak circuit analysis based performance optimization for ZVT PWM boost converters

Abstract

The mechanism of a ZVT PWM boost converter is analyzed in detail in this study. In addition, the comprehensive parasitic parameters are taken into consideration. It is discovered that some unexpected modes, referred to as sneak circuit modes, occur during the operation of the converter, when certain excitation conditions are applied. Parasitic parameters and dynamic sneak paths impact the converter operating performance, causing both positive and negative effects. The effects of sneak circuits and excitation conditions are analyzed so that those with negative effects can be eliminated, and those with positive effects can be utilized. In contrast to previous works, sneak circuit phenomena are utilized to optimize the converter performance. Furthermore, parasitic circuit elements are identified and quantitatively determined to estimate their impact on the switching performance of the converter. Combining parameter optimization and topology optimization, soft switching is achieved in both the main power switch and the auxiliary power switch, and waveform distortion is reduced. Finally, simulation and experimental results are included to verify the theoretical analyses.