A Current-Sharing Method for Interleaved High-Frequency LLC Converter With Partial Energy Processing

A Current-Sharing Method for Interleaved High-Frequency LLC Converter With Partial Energy Processing
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具有部分能量处理功能的交错式高频 LLC 变换器的均流方法

DOI:
10.1109/tie.2019.2896102
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发表时间:
2020-02
影响因子:
7.7
通讯作者:
Shuai Shao
Shuai Shao
中科院分区:
计算机科学1区
文献类型:
--
作者:
Hui Chen;Xinke Wu;Shuai Shao

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本文提出了一种具有部分能量处理功能的交错式高频 LLC 转换器的均流方法。每相增加一个小型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实现相间均流。辅助转换器仅处理部分能量;因此,所添加的辅助转换器的功率损耗被最小化,并且保持了整体的高效率。通过将谐振变换器的均流转化为dc-dc变换器的脉宽调制控制,所提出的方法实现简单并且易于扩展到多相。辅助转换器的频率独立于主LLC,因此LLC可以工作在固定的开关频率和占空比下,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 1 MHz 两相交错 LLC 原型来验证理论分析。
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.
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