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High Frequency Resonant Converters: An Overview on the Magnetic Design and Control Methods
IEEE Journal of Emerging and Selected Topics in Power Electronics ( IF 5.5 ) Pub Date : 2020-07-22 , DOI: 10.1109/jestpe.2020.3011166
Fred C. Lee , Qiang Li , Ahmed Nabih

Resonant converters, especiallyLLC converters, are deployed in many applications thanks to their reliability and high efficiency. With the introduction of wide band gap (WBG) devices and the soft switching feature of the LLC converter, the switching frequency of the LLC can be pushed to the order of megahertz, to shrink the converter size and increase the power density. However, magnetic design and control challenges stand in the way of doing so. This article addresses the challenges of high-frequency magnetic design for the LLC converter, and presents an overview for the latest solutions on the magnetic design of the LLC transformer. The matrix transformer is suitable for an LLC converter where high output current at high frequency is required. Different integration methods for the matrix transformer are discussed and demonstrations of hardware prototypes are provided. The dynamic behavior of the LLC converter presents another significant challenge against deploying an LLC converter in applications where fast transient response is needed. This article discusses such challenges as well and provides an overview on the latest control techniques, including average current-mode control, charge control, and simplified optimal trajectory control, to improve the dynamic performance of an LLC converter. A 1 megahertz LLC converter with digital control is presented, using simplified optimal trajectory control with improved transient performance over a wide frequency range.

中文翻译:

高频谐振转换器:电磁设计和控制方法概述

谐振转换器,尤其是LLC转换器,由于其可靠性和高效率而被部署在许多应用中。随着宽带隙(WBG)器件的引入和LLC转换器的软开关功能,LLC的开关频率可推至兆赫兹的数量级,以缩小转换器尺寸并增加功率密度。但是,磁性设计和控制方面的挑战阻碍了这样做。本文介绍了LLC转换器高频磁设计的挑战,并概述了LLC变压器磁设计的最新解决方案。矩阵变压器适用于需要高频高输出电流的LLC转换器。讨论了矩阵变换器的不同集成方法,并提供了硬件原型的演示。在需要快速瞬态响应的应用中,LLC转换器的动态性能提出了另一个重大挑战。本文还讨论了这些挑战,并概述了最新的控制技术,包括平均电流模式控制,充电控制和简化的最佳轨迹控制,以改善LLC转换器的动态性能。提出了一种具有数字控制功能的1兆赫兹LLC转换器,它使用简化的最佳轨迹控制,并在宽频率范围内改善了瞬态性能。在需要快速瞬态响应的应用中,LLC转换器的动态性能提出了另一个重大挑战。本文还讨论了这些挑战,并概述了最新的控制技术,包括平均电流模式控制,充电控制和简化的最佳轨迹控制,以改善LLC转换器的动态性能。提出了一种具有数字控制功能的1兆赫兹LLC转换器,它使用简化的最佳轨迹控制,并在宽频率范围内改善了瞬态性能。在需要快速瞬态响应的应用中,LLC转换器的动态性能提出了另一个重大挑战。本文还讨论了这些挑战,并概述了最新的控制技术,包括平均电流模式控制,充电控制和简化的最佳轨迹控制,以改善LLC转换器的动态性能。提出了一种具有数字控制功能的1兆赫兹LLC转换器,它使用简化的最佳轨迹控制,并在宽频率范围内改善了瞬态性能。和简化的最佳轨迹控制,以改善LLC转换器的动态性能。提出了一种具有数字控制功能的1兆赫兹LLC转换器,它使用简化的最佳轨迹控制,并在宽频率范围内改善了瞬态性能。以及简化的最佳轨迹控制,以改善LLC转换器的动态性能。提出了一种具有数字控制功能的1兆赫兹LLC转换器,它使用简化的最佳轨迹控制,并在宽频率范围内改善了瞬态性能。
更新日期:2020-07-22
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