Current-sharing control technique for interleaving VRMs using intercell transformers
Current-sharing control technique for interleaving VRMs using intercell transformers
复制标题
使用单元间变压器交错 VRM 的均流控制技术
DOI：
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复制
发表时间：
2009
期刊：
影响因子：
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通讯作者：
T. Meynard
中科院分区：
文献类型：
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作者：
Mathieu Le Bolloch;M. Cousineau;T. Meynard
使用单元间变压器的并联变换器结构是最适合于低电压、大电流和快速瞬态功率变换应用的结构之一。具有单元间变压器的交错降压转换器的主要兴趣在于每个转换器臂中的电流涟漪减少，这与非耦合电感器架构的情况不同。因此，对开关和电感器的电流约束不太严格，并且获得了较低的焦耳损耗，从而导致较高的效率。本文强调了一个基本的限制，这些交错式转换器使用电池间变压器。通过Transformer的差动电流误差会导致磁通漂移，并可能导致磁芯饱和。在临时控制故障的情况下，臂电流以非常缓慢的动态响应恢复到适当的平衡。通过状态空间法计算臂电流传递函数，推导出微分电流时间常数。最后，对标准滤波器的稳定性进行了研究，并提出了一种合适的均流环调节滤波器，以加快系统恢复平衡。
Parallel converter architecture using intercell transformers is one of the most adapted architecture for low-voltage, high-current and fast transient power conversion applications. Interleaved buck converter with intercell transformers main interest is the current ripple reduction in each converter arms which is not the case with non-coupled inductor architectures. As a consequence, current constraints on switches and inductors are less severe and lower Joule losses are obtained leading to a higher efficiency. This paper highlights a fundamental limitation for those interleaved converters using intercell transformers. A differential current error through transformer causes flux drift and can lead to magnetic core saturation. In case of temporary control failure, arm currents get back to proper balance with a very slow dynamic response. State-space study allows us to calculate arm current transfer function and deduce the differential current time constant. Finally, a stability study with standard filters is presented and a proper current-sharing loop regulator filter is proposed in order to speed up system return to equilibrium.