Buck-Boost全桥DC-DC变换器的DCM和CCM操作

N. Swaminathan, L. N, Yue Cao
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引用次数: 1

摘要

Buck-Boost型全桥DC-DC变换器具有高增益、高功率应用的潜力,特别是在太阳能光伏、电池和燃料电池馈电系统中,因为变换器具有非脉动输入和输出电流。然而,由于变压器绕组中存在直流电流,这些变换器缺乏关注。本文提出了一种新的Buck-Boost全桥(BBFB)变换器,该变换器采用混合控制方案(HCS)减轻变压器直流电流。BBFB变换器表现出固有的软开关,使得零电压开关(ZVS)条件适用于单个开关。本文对BBFB变换器进行了广泛的分析,包括不连续导通模式(DCM)的工作和DCM的边界条件。负载阶跃变化下BBFB变换器的动态特性验证了HCS方案不影响变换器的性能。此外,本文还提出了实际变压器电流波形中由寄生电容引起的高频振荡的模型。所有的分析和所建立的模型都得到了仿真和硬件实验的验证。所建立的模型可用于设计在保证零电压运行的前提下提高效率的BBFB变换器。此外,所建立的模型和结果提供了在DCM和连续导通模式(CCM)下直流电压增益变化的见解。这有助于设计者根据要求选择BBFB变换器的工作模式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
DCM and CCM Operation of Buck-Boost Full-Bridge DC-DC Converter
Buck-Boost based full-bridge DC-DC converters possess potentials for high gain, high power applications, particularly in solar PV, battery, and fuel-cell fed systems, as the converters feature non-pulsating input and output currents. However, these converters lack attention due to the presence of DC-current in the transformer winding. In this paper, a novel Buck-Boost full-bridge (BBFB) converter with a hybrid control scheme (HCS) mitigating the transformer DC-current is presented. The BBFB converter exhibits inherent soft-switching such that zero voltage switching (ZVS) conditions apply for individual switches. This paper analyzes the BBFB converter extensively, including the discontinuous conduction mode (DCM) operation and the DCM boundary condition. A dynamic behavior of the BBFB converter under a load step change verifies that the HCS scheme does not affect the converter performance. Besides, this work presents a model for the high frequency oscillations that occur in the practical transformer current waveform due to parasitic capacitances. All the analyses and the developed models are verified in simulations and hardware experiments. The developed models are useful for designing the BBFB converter with improved efficiency by ensuring the ZVS operation. Further, the developed models and results provide an insight for the DC voltage gain variations during DCM and continuous conduction mode (CCM). This helps the designer to choose the BBFB converter’s operating mode based on the requirement.
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