Extended wide-load range model for multi-level Dc-Dc converters and a practical dual-mode digital controller
Extended wide-load range model for multi-level Dc-Dc converters and a practical dual-mode digital controller
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多电平 DC-DC 转换器的扩展宽负载范围模型和实用的双模式数字控制器
DOI：
10.1109/apec.2016.7468080
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Michael W. Baker
中科院分区：
文献类型：
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作者：
N. Vukadinović;A. Prodic;B. Miwa;Cory Arnold;Michael W. Baker
本文讨论了以前的模型的多电平飞跨电容（ML-FC）DC-DC转换器的局限性，在不能预测的不稳定性，在不可忽略的电感电流涟漪的条件下，飞跨电容电压的调节，通常存在于轻到中等负载的工作条件。假设小纹波近似，线性交流等效电路推导出一般N电平FC DC-DC降压变换器，并通过几何分析，该模型的局限性进行了解释。此外，相关的稳定性问题得到解决。然后，一个扩展的数学模型，考虑到电感器电流的涟漪分量的推导和实际的双模数字控制器的设计中使用，这对于不可忽略的涟漪操作条件改变其操作模式。通过仿真和实验验证，验证了模型的有效性和所引入的控制器的功能。在宽输入15 V/3 A、250 kHz、45 W的三电平实验样机上对该控制器的性能进行了测试。
This paper addresses limitations of previous models of multi-level flying capacitor (ML-FC) dc-dc converters, in terms of not being able to predict instability in the regulation of the flying capacitor voltage under non-negligible inductor current ripple conditions, usually existing under light to medium load operating conditions. Assuming small-ripple approximation, linear ac equivalent circuit is derived for a general N-level FC dc-dc buck converter and, through a geometrical analysis, limitations of that model are explained. Also, related stability problems are addressed. Then, an extended mathematical model that takes into account the ripple component of the inductor current is derived and used in the design of a practical dual-mode digital controller, which for non-negligible ripple operating conditions changes its mode of operation. Validity of the model and the functionality of the introduced controller are verified both through simulations and experimental verifications. Performance of this controller is tested with a wide input 15 V/3 A, 250 kHz, 45 W, three-level experimental prototype.