摘要
对全桥LLC变换器提出一种柔性多模态的宽增益范围控制策略。文中首先讨论全桥LLC的状态分析模型和现有子模态控制原理,并建立数字辅助设计平台,这些理论、工具为后续工作奠定基础。针对现有全桥LLC变换器各子模态逻辑独立、整体增益范围有限的不足,提出一种全桥变频-移相不对称-DPWM控制的平滑柔性变模态控制策略,并分析各子模态的工作特性,对模态工作机匹配和状态过渡过程等技术问题与设计要点进行详细说明。样机实验证明,所提方法能使全桥LLC变换器实现极宽的增益范围,并能在全工作范围内保证变换器零电压开通,实现高工作效率。
A flexible variable-mode wide gain range control strategy was proposed for the full-bridge LLC converter.This article discussed the state analysis model of full bridge LLC,sub-mode control principles,and established a digital-aided design platform.These theories and tools laid the foundation for the follow-up works.Aiming at the deficiencies of the existing full-bridge LLC converters of independent sub-mode logic and limited overall gain range,a smooth and flexible variable-mode control strategy combining full-bridge frequency control,asymmetric phase shift control and DPWM control was proposed.The working characteristics of each sub-mode,the technical issues and design points,such as the matching of the working machine and the state transition process,were explained in detail.The prototype experiment proves that the proposed method allows the full-bridge LLC converter to achieve an extremely wide gain range,and ensure the zero-voltage switching and hence high operating efficiency in the full operating range.
作者
缪哲语
仝昊
姚文熙
吕征宇
MIAO Zheyu;TONG Hao;YAO Wenxi;LYU Zhengyu(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,Zhejiang Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2022年第2期747-760,共14页
Proceedings of the CSEE
基金
国家自然科学基金项目(52037010)。
