摘要
提出了一种基于LLC谐振的多路输出LED均流驱动电路,方案中DC/DC部分采用了LLC谐振,提高了转换的频率,同时能够实现原边开关管的零电压开通和副边整流二极管的零电流关断,减少了损耗,提高了系统的效率.LED的驱动部分采用了平衡电容隔离均流,输出达到很好的均流效果.PSIM仿真和样机测试均证明了该电路的可行性.
It proposes a circuit about multi-output constant current LED drivers, based on LLC resonant. The LLC resonant was adopted in the DC/DC circuit, improving the frequency of conversion. The swit- ches on the primary side could work in zero-voltage-switching mode （ZVS）, and the diodes on the second- ary side could work in zero-current-switching（ZCS）mode,which decreased the loss of switching and improved the efficiency of the system. The balance capacitor was used in the LED driver circuit, and it was easy to achieve the balance of the current. Meanwhile, a prototype was proposed to test in the laboratory. It focused on the mechanism of the resonant and the balance of the current. The system has been simula- ted and verified, based on PSIM.
出处
《广东工业大学学报》
CAS
2013年第2期57-62,共6页
Journal of Guangdong University of Technology
基金
广东省教育部产学研结合重点项目(2012A090300005)
国家自然科学基金青年科学基金资助项目(500120086)
关键词
多路LED串
隔离
自动均流
谐振
multi-output LED strings
isolated drive
current balancing
resonant
