摘要
以具有多路LED输出均流功能的反激式功率变换器为研究对象,通过将反激变换器的功率变压器与均流耦合电感集成在一个磁芯结构上,提出新型的具有多路LED自动均流功能的磁集成反激变换器方案。采用电路和磁路理论以及电路磁路综合仿真,详细分析集成方案的工作原理、工作波形以及输出均流特性。分析和实验测试结果表明,该磁集成变换器具有优良的多路均流特性,即使在两路负载相差8倍的情况下,均流精度仍达3%以内,完全满足工程应用要求。该磁集成变换器采用了先进的磁集成技术,具有结构简单、不需要额外均流控制电路、可靠性高、效率和功率密度高及成本低等特点,很适用于LED多路驱动电源应用。
The flyback power converter with multi-output LED current sharing was studied.The novel magnetics integration scheme was proposed by combining power transformer and current-sharing coupling inductor in a single magnetic core structure.With electrical and magnetic theory and electrical circuit and magnetic circuit syno simulation,the operation principle,operation waveforms and current-sharing output characteristics were analyzed in details.The analysis and experimental test results showed its excellent multi-output current-sharing behaviors and 3% current-sharing accuracy was ensured even with eight times load difference,which fully satisfied the requirement of engineering applications.The proposed scheme has many advantages such as advanced magnetic integration technology,simple structure,no extra current-sharing control circuit needed,higher reliability,high efficiency,high power density,lower cost and etc.,and has practical applications in multi-output LED driving power supplies.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2012年第30期30-36,7,共7页
Proceedings of the CSEE
关键词
LED
反激
磁集成
均流
多路
变换器
LED
flyback
integrated magnetic
current sharing
multi-output
converter
