双向LLC谐振变换器谐振电感磁集成方案

双向LLC谐振变换器实现了能量的双向流通,变换效率高,被广泛应用于新能源领域.但其变压器原副边各有一个谐振电感,增大了变换器体积,不符合高功率密度的发展要求;同时,磁性元件的增加会降低整机效率.针对上述问题,详细分析了双向LLC谐振变换器的工作原理以及主要工作波形,选择合适的方案对2个谐振电感进行磁集成设计.在确保变换...

Magnetic Integration Scheme for Resonant Inductor in Bidirectional LLC Resonant Converter

Bidirectional LLC resonant converter Can realize bidirectional flow of energy. It has a high conversion efficiency and is widely used in the field of new energy. But it have two resonant inductors in transformer each hand, which increases the volume of converter and does not meet the requirements of high power density. At the same time, the increase of the magnetic component will reduce the efficiency of converter. In view of the above problems, the paper analyzes the working principle and the main working waveforms of the bidirectional LLC resonant converter in detail, and chooses the appropriate scheme to design the two resonant inductors by magnetic integration. On the basis of ensuring that the converter can achieve ZVS, the two resonant inductors are integrated. Finally, a prototype of 48~400V/1kW output is built, and the correctness of the theoretical analysis is verified, The experimental results show that the proposed scheme effectively reduces the converter size and improves the efficiency of the converter without affecting the operating characteristics.