基于“交流电感”和基于“直流电感”的充电器大小信号响应的比较分析

I. Zeltser, S. Ben-Yaakov
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引用次数: 1

摘要

比较了开关电源变换器中电感的两种工作方式。在大多数PWM变换器中使用的经典方法是将电感置于具有非零平均电流的路径中。这种电感在这里称为“直流电感”。相反,以零平均电流工作的电感称为“交流电感”。本文进行的理论分析比较了直流电感和交流电感中电流的小信号响应作为各种系统参数(如输入输出电压和占空比)的函数,在直流电感情况下,在交流电感情况下频率。该分析得到了本研究建立的大信号和小信号模型的支持,并与解析导出的大信号和小信号方程进行了验证。应用平均模型推导了小信号电流响应。实验验证了本文的解析推导和模拟结果。理论预测与分析结果吻合较好。根据这项研究的结果,我们可以得出结论,基于“交流电感”的拓扑结构对于电流源应用是最佳的,例如电池充电器,其中平均输入和输出电压之间的差异预计会存在并随着时间的推移而发展。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Comparative Analysis of the Large and Small Signal Responses of "AC inductor" and "DC inductor" Based Chargers
Two approaches of operating inductors in switched mode power converters are compared. The classic method, utilized in most PWM converters, is to place the inductor in a path that has a non-zero average current. Such inductors are referred to here as "DC inductors". In contrast, inductors that operate with zero average current are denoted "AC inductors". The theoretical analysis carried out in this paper compares the small signal response of the current in the DC and AC inductors as a function of various system parameters, such as input and output voltages and duty cycle, in the case of the DC inductor, and frequency in the case of the AC inductor. The analysis was supported by large and small signal model developed in this study and verified against analytically derived large and small signal equations. The small signal current response was derived by applying average models. The analytical derivations and simulations of this study were verified experimentally. Good agreement was found between the theoretical predications and the analytical results. Based on the results of this study one can conclude that "AC inductor" based topologies are optimal for current sourcing applications, such as battery chargers, where differences between the average input and output voltages are expected to exist and develop over time.
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