摘要
提出了一种基于Zeta变换器的恒流输出电路作为高亮度白光LED灯的驱动方案。主电路结构在Zeta变换器的基础上进行了改进,采用固定导通时间控制策略,结构简单,无需补偿电路,动态响应速度快。分析了变换器工作方式,推导了变换器的稳态与小信号模型,对控制环路进行了理论分析,运用PSIM软件对系统闭环进行了仿真验证。
A kind of buck-boost constant current source based on Zeta converter as a high-brightness white LED lamp driver circuit was provided.The main circuit was based on basic Zeta converter with some improvement.The driver used constant on-time（COT） control mode,with simple structure,which needed no compensation cir-cuit and had fast dynamic response.The working principle of converter was analyzed.The static mode and small sig-nal mode of converter were derived.The theory of control loop was analyzod,and system closedloop was simulated and verified based on PSIM.
出处
《低压电器》
北大核心
2010年第10期35-39,51,共6页
Low Voltage Apparatus
关键词
发光二极管驱动
升降压变换器
固定导通时间控制
light-emiffing diode（LED） driver
Zeta converter
constant on-time（COT） control mode
