A Family of LLC Converters with Magnetic Control

Yuqi Wei, A. Mantooth
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引用次数: 2

Abstract

Although frequency control is an effective and common control strategy for resonant converters, it still has some drawbacks: 1) wide operating switching frequency range is required; 2) degraded circuit electro-magnetic interference (EMI) performance; 3) in some applications, like interleaving and multiple output operations, not enough control freedoms to achieve independent control since frequency will affect operation of each phase or output channel. On the other hand, magnetic control or variable inductor control (VIC) can regulate the resonant converter without adjusting the switching frequency and duty cycle, which can effectively address the above-mentioned issues. Therefore, in this article, all possible LLC converters with different VIC control strategies are introduced. The suitable applications for each VIC control strategy are summarized. Key design guidelines for variable inductor are presented. Experimental results for variable resonant inductance, variable magnetizing inductance, and a novel variable resonant and magnetizing inductance based LLC converters are presented. Other applications of VIC LLC converters are also discussed.
具有磁控制的LLC变换器系列
频率控制是谐振变换器常用的有效控制策略,但也存在一些缺点:1)工作开关频率范围宽;2)电路电磁干扰(EMI)性能下降;3)在某些应用中,如交错和多个输出操作,由于频率会影响每个相位或输出通道的操作,没有足够的控制自由度来实现独立控制。另一方面,磁控制或可变电感控制(VIC)可以在不调整开关频率和占空比的情况下对谐振变换器进行调节,可以有效地解决上述问题。因此,在本文中,所有可能的LLC变换器与不同的VIC控制策略被介绍。总结了各种VIC控制策略的适用范围。给出了可变电感器的设计要点。给出了可变谐振电感、可变磁化电感以及一种基于可变谐振和磁化电感的新型LLC变换器的实验结果。还讨论了VIC LLC变换器的其他应用。
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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