Comprehensive Analysis of Synchronous Rectifying Signal Delay of High-Frequency LLC Resonant DC/DC Converter
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发表刊物：IEEE Transactions on Power Electronics
关键字：LLC resonant DC/DC converters are widely applied in various scenarios such as electronic device power supplies, vehicle chargers, etc. To improve the efficiency of the LLC converter, synchronous rectifiers (SR) are employed. However, due to various reasons such as the hardware propagation delay, the SR gate signal can lag behind the secondary side current particularly when the switching frequency of the LLC converter approaches mega-Hertz level. This delay has a critical impact on the operation mode and the output characteristic of the LLC converter. Starting with the SR delay mechanism, this paper comprehensively analyzes the operation of the LLC converter and derives the time-domain model under SR signal delay. The output gain and accurate power loss model of MOSFETs under different working modes are built to study the impact of SR signal delay on the LLC converter. The relationship between the SR signal delay and the LLC converter characteristics is quantified and summarized. Two new working stages of the LLC converter are revealed. Simulation and experimental studies are conducted to validate the theoretical analysis results. This work can provide the theoretical basis for optimizing the design of high-frequency high-efficiency LLC converter.
合写作者：杨之青,刘宇思,Alan Mantooth,丁立健
第一作者：王晓舟
论文类型：期刊论文
通讯作者：赵爽*
学科门类：工学
文献类型：J
是否译文：否
发表时间：2024-06-13
收录刊物：SCI