Average current-mode control for LLC series resonant dc-to-dc converters

Jinhaeng Jang, P. S. Kumar, Dongyun Kim, B. Choi
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引用次数: 22

Abstract

Conventional voltage mode control only offers limited performance for LLC series resonant dc-to-dc converters experiencing wide variations in operating conditions. This paper presents average current mode control which could consistently provide good closed-loop performance for LLC resonant converters for the entire operational range. The proposed control scheme employs an additional feedback from the current of the resonant tank network to overcome the limitation of the existing voltage mode control. The principles, implementation and performance of the average current mode control scheme are investigated to identify their respective merits and limitations compared with conventional control schemes. The accuracy of dynamic analysis and validity of control design are confirmed with both computer simulations and experimental measurements using 150W prototype converter.
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LLC系列谐振dc- dc转换器的平均电流模式控制
传统的电压模式控制只提供有限的性能,LLC系列谐振dc- dc变换器在工作条件下经历广泛的变化。本文提出了一种平均电流模式控制方法,可以在整个工作范围内为LLC谐振变换器提供良好的闭环性能。该控制方案利用谐振槽网电流的附加反馈,克服了现有电压模式控制的局限性。研究了平均电流模式控制方案的原理、实现和性能,与传统控制方案相比,确定了它们各自的优点和局限性。通过150W样机的计算机仿真和实验测量,验证了动态分析的准确性和控制设计的有效性。
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