Design and Analysis of an Active Adaptive and Regenerative Snubber for PSFB Converter

Vijaymahantesh V Surkod, K. Vasudevan
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Abstract

This paper presents a detailed design and analysis of an active adaptive and regenerative snubber for a phase shifted full bridge converter. A high voltage overshoot at the full bridge rectifier diodes of a PSFB converter occurs due to parasitic components such as transformer leakage inductance and diode capacitance. A snubber is essential in this converter to limit the voltage overshoot and the stress on the diodes. A control methodology for the snubber is proposed that reduces the snubber switching frequency and makes the clamping voltage a function of input voltage that helps in reducing voltage stress, voltage ringing magnitude on the secondary diodes, and hence the EMI. The energy efficiency of the snubber is determined, and theoretical energy efficiency and power loss comparisons with other approaches in the literature are presented.
PSFB变换器有源自适应再生缓冲器的设计与分析
本文介绍了一种用于移相全桥变换器的有源自适应再生缓冲器的详细设计和分析。PSFB变换器的全桥整流二极管的高电压过调是由于变压器漏感和二极管电容等寄生元件引起的。缓冲器在这个转换器中是必不可少的,以限制电压超调和二极管上的应力。提出了一种缓冲器的控制方法,可以降低缓冲器的开关频率,并使箝位电压成为输入电压的函数,从而有助于降低电压应力、二次二极管上的电压振铃幅度,从而降低电磁干扰。确定了缓冲器的能量效率,并与文献中其他方法的理论能量效率和功率损失进行了比较。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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