采用宽带隙半导体器件的可变直流链路电压LLC谐振DC/DC变换器

Shuang Zhao, A. Kempitiya, Wibawa Chou, V. Palija
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引用次数: 0

摘要

宽带隙功率器件的应用使电力电子系统能够实现更高的效率,改善功率密度和减轻重量。宽量程LLC变换器由于其固有的零电压开关特性和简单的控制实现,被广泛应用于电动汽车车载充电器和可再生能源发电等各种应用场景。本文详细介绍了一种采用宽带隙器件的高频宽量程LLC谐振DC/DC变换器的设计过程。为了扩大工作范围,采用线性反馈变直流电压控制。介绍了系统的功率损耗模型,并通过仿真研究进行了验证。利用WBG器件建立了一个3.7 kW、500 kHz的实验样机。实验结果表明,变电压控制系统的峰值功率效率可达98.4%,而常规恒电压控制系统的峰值功率效率为97.6%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Variable DC-Link Voltage LLC Resonant DC/DC Converter Using Wide Band Gap Semiconductor Devices
Application of wide bandgap power devices enables the power electronics system to achieve higher efficiency, improved power density and reduced weight. Wide range LLC converters are extensively applied in various application scenarios such as electric vehicle on-board charger and renewable energy generation due to their intrinsic zero voltage switching features and simple control implementation. In this paper, the design process of a high-frequency wide-range LLC resonant DC/DC converter using wide bandgap (WBG) devices is demonstrated in details. To broaden the operation range, linear feedback variable DC-link voltage control is utilized. The power loss model of the system is introduced and validated via simulation study. A 3.7 kW and 500 kHz experimental prototype is built with WBG devices. The experimental results reveal that peak power efficiency of the system can reach 98.4% with the variable DC-link voltage control while that of the conventional constant DC-link voltage control is 97.6%.
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