LLC变流器ZVS工况再分析

Haibin Song, Daofei Xu, A. Zhang
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引用次数: 1

摘要

LLC变换器因其主开关的ZVS操作和次开关的ZCS操作而得到广泛应用。这些特点使其适合于高功率设计,以迎合开关电源(SMPS)的小型化趋势。一次开关的ZVS操作是高fs设计实现高效率的关键。传统的LLC变换器ZVS条件分析对于高fs设计不够精确。本文详细分析了该系统在无功时段的运行方式。在此基础上,推导出精确的ZVS条件。通过仿真和半桥LLC样机对理论分析进行了验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Re-analysis on ZVS Condition for LLC Converter
LLC convertor is widely used because of ZVS operation of primary switches and ZCS operation of secondary switches. These features make it suitable for high fs design to cater for the miniaturization trend of switching mode power supply (SMPS). ZVS operation of the primary switches is critical for high fs design to achieve high efficiency. Traditional analysis of the ZVS condition for LLC converter is not accurate enough for high fs design. This paper gives a detail analysis on the operation modes during the dead time interval. An accurate ZVS condition is derived based on the analysis. The verification of the theoretical analysis has been carried out with simulation and a half-bridge(HB) LLC prototype.
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