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SiC半桥功率模块损耗不平衡的发现——分析与验证

Discovery of Loss Imbalance in SiC Half-Bridge Power Modules – Analysis and Validations

语言:

中文摘要

本文揭示了半桥功率模块中高侧与低侧SiC MOSFET开关损耗不一致的现象。研究发现,由于高侧栅极寄生电容的影响,高侧器件的开关损耗比低侧高出40%以上。该发现对中压功率模块的设计与效率优化具有重要参考价值。

English Abstract

It is commonly assumed that power semiconductor switching losses are the same for high-side and low-side devices in a half-bridge power module. However, this article reveals that the high-side SiC mosfet in a medium-voltage power module exhibits over 40% higher switching energy compared with the low-side SiC mosfet. The loss imbalance is attributed to the parasitic high-side gate capacitance in th...
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SunView 深度解读

该研究对阳光电源的核心产品线(如组串式光伏逆变器、PowerTitan储能系统及风电变流器)具有重要指导意义。随着公司产品向高功率密度、高效率的SiC方案转型,高侧与低侧损耗不平衡问题直接影响模块的热设计与寿命评估。建议研发团队在设计阶段引入该寄生参数模型,优化驱动电路布局与驱动参数,以平衡热应力,提升逆变器及PCS在极端工况下的可靠性与使用寿命。