带维持电容自适应LLC谐振变换器同步整流

Adaptive Synchronous Rectification Control Strategy for LLC Resonant Converter With Maintain Capacitance

提出一种新颖的带维持电容自适应LLC谐振变换器同步整流控制策略。通过检测同步整流管的两端压降来实现同步整流管的自动开通和关断优化,从而减少同步整流管中寄生二极管的导通时间,优化电路效率。该控制策略适用于LLC谐振变换器的全负载范围,同时也适用于其他类型的变换器。详细介绍了所提同步整流控制策略的原理和实现方式,搭建了一台1.44 kW的LLC谐振变换器验证所提方案的可行性,并与采用传统电压型同步整流控制策略进行对比研究。研究表明,相对于传统的同步整流控制策略,所提控制策略具有更加智能且精确的同步整流效果。

A novel adaptive synchronous rectification control strategy for LLC resonant converter with maintain capacitance is proposed.Based on detecting the voltage across the synchronous rectifier,the automatic turn-on and turn-off optimization of the synchronous rectifier is realized, thus reducing the conduction time of the parasitic diode of the synchronous rectifier and optimizing the circuit efficiency.This control strategy is applicable to the full load range of the LLC resonant converter and is also suitable for other types of converters.The principle and implementation of the synchronous rectification control strategy are introduced in detail.A 1 .44 kW LLC resonant converter is designed to verify the feasibility of the proposed scheme and compared with the traditional voltage synchronous rectification control strategy.The results show that the proposed control strategy has more intelligent and accurate synchronous rectification effect compared with the traditional synchronous rectification control strategy.