交错并联磁集成双向LLC谐振变换器的高轻载效率控制方法

应用交错并联技术,可以有效扩充LLC谐振变换器的容量,但增多的通道数会造成变换器轻载效率低的问题.针对这一问题,以交错并联磁集成双向LLC谐振变换器为研究对象,在采用谐振电感反向耦合实现两相变换器自动均流的基础上,分析了变换器的工作原理和工作特性,提出了一种移相控制+变频控制+相屏蔽控制的控制策略,并给出了具体的实现方...

High Light-load Efficiency Control Method for Interleaved Magnetic Integrated Bidirectional LLC Resonant Converter

The capacity of an LLC resonant converter can be effectively expanded using the interleaved technique. However, the added channels will cause the low light-load efficiency of the converter. To solve this problem, an interleaved magnetic integrated bidirectional LLC resonant converter is taken as the research object in this paper. On the basis of realizing the automatic current sharing of a two-phase converter by means of reverse coupling between resonant inductors, the operation principle and characteristics of the converter are analyzed. Moreover, a control strategy of phase shift + variable frequency + phase shielding is proposed, and the implementation method is given in detail. Finally, an experimental prototype with output power of 1 000 W and 48 V/400 V was built, and the result of a comparative experiment verified the effectiveness of the proposed scheme.