In this paper, a current-sharing method for an interleaved high-frequency LLC converter with partial energy processing is presented. A small transformer and an auxiliary low-power dc–dc converter are added in each phase, and the current sharing between phases is achieved by controlling the duty cycle of the auxiliary converter. Only partial energy is processed by the auxiliary converter; hence, the power losses of the added auxiliary converters are minimized, and the overall high efficiency is maintained. By transforming the current sharing of the resonant converter into pulsewidth modulation control of a dc–dc converter, the proposed method is simple to implement and easy to extend to multiple phases. The frequency of the auxiliary converter is independent of the main LLC, so the LLC can operate at a fixed switching frequency and duty cycle, and it is suitable for high-frequency applications. The operating principle, design considerations, and the control schemes are presented, and a 1-MHz two-phase interleaved LLC prototype was built to verify the theoretical analysis.

中文翻译：

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一种部分能量处理交错式高频LLC转换器的均流方法

在本文中，提出了一种用于具有部分能量处理的交错式高频 LLC 转换器的均流方法。每相增加一个小变压器和一个辅助小功率dc-dc变换器，通过控制辅助变换器的占空比来实现各相之间的均流。辅助转换器只处理部分能量；因此，增加的辅助转换器的功率损耗被最小化，并保持整体高效率。通过将谐振转换器的均流转换为 dc-dc 转换器的脉宽调制控制，所提出的方法易于实现且易于扩展到多相。辅助转换器的频率独立于主 LLC，因此 LLC 可以在固定的开关频率和占空比下运行，适合高频应用。介绍了工作原理、设计考虑和控制方案，并构建了一个 1 MHz 两相交错 LLC 原型来验证理论分析。