Comprehensive Analysis of Synchronous Rectifying Signal Delay of High-Frequency LLC Resonant DC/DC Converter

被引：1
|
作者：
Wang, Xiaozhou [1 ]
Zhao, Shuang [1 ]
Yang, Zhiqing [1 ]
Liu, Yusi [1 ]
Mantooth, H. Alan [2 ]
Ding, Lijian [1 ]
机构：
[1] Hefei Univ Technol, Sch Elect Engn, Hefei 230009, Anhui, Peoples R China
[2] Univ Arkansas, Dept Elect Engn, Fayetteville, AR 72701 USA
来源：
IEEE TRANSACTIONS ON POWER ELECTRONICS | 2024年 / 39卷 / 10期
基金：
安徽省自然科学基金;
关键词：
High-frequency; LLC resonant converter; signal delay; synchronous rectifier (SR); time-domain model; DRIVING SCHEME; RECTIFIER; RECTIFICATION;
D O I：
10.1109/TPEL.2024.3414595
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
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 the 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 article 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 article can provide the theoretical basis for optimizing the design of a high-frequency LLC converter.
引用
收藏
页码：13348 / 13364
页数：17
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