摘要
为解决LED驱动电源寿命短的问题,提出一种PFC+Buck/Boost的无电解电容LED驱动电源方案。PFC采用常用的Boost型电路结构,控制方法采用简单的CRM控制方式,Buck-Boost双向变换器与LED负载并联,替代电解电容器实现电源交流输入侧和直流输出侧的瞬时功率不平衡的功率耦合功能。设计了PFC的CRM控制策略和双向变换器的固定占空比控制策略,建立了Saber仿真实验模型。仿真研究结果表明,该电路的功率因数达到0.9以上,输出电流和输出电压具有很好的稳定性。
In order to solve the problem of short lifetime of LED driving power, a scheme for electrolytic capacitor-less light emitting diode （LED） driving power based on power factor correction （PFC） combined with a Buck-Boost circuits is proposed. The conventional Boost circuit and the CRM control method are adopted in PFC circuit. Besides, the electrolytic capacitor is replaced by a Buck-Boost bi-directional converter in parallel with LED load to balance instantaneous power between AC input and DC output. The Buck-Boost converter achieves the function of power coupling. The fixed duty cycle control strategy is applied in Buck-Boost bi-directional converter, as well as the CRM control method is adopted in PFC circuit. Finally, simulation models and experimental platform are established by Saber. The experimental results are presented that the power factor of the circuit is more than 0.9 and the output-current and output-voltage have a good stability.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2017年第17期58-64,共7页
Power System Protection and Control
基金
国家自然科学基金项目(51467006)
江西省科技厅项目(20151BBE5011
20161BBH80032)~~
