基于光伏发电的降压低纹波LED照明系统研究

Research on a step-down and low ripple LED driver lighting system based on photovoltaic power generation

针对传统的太阳能光伏发电照明系统存在逆变电路、负载端需交流高压输出且输出纹波率高等不良特点,研究的清洁新能源LED照明系统改逆变电路为直流驱动电路,设计采用双输入降压型Cuk高效LED恒流驱动电路和基于电导增量MPPT控制算法。不仅改善整个光伏LED照明系统的可靠性和稳定性,而且实现多路输入、降压、低纹波直流驱动功能。最后使用Saber软件对所设计的新能源照明系统双输入降压型Cuk LED恒流驱动拓扑电路进行仿真,从稳态特性和系统效率等方面总结分析仿真实验结果,验证文中理论分析的有效性。

In view of the disadvantages of the traditional solar photovoltaic lighting system,such as inverting circuit,high voltage output and high ripple rate at the load end,a design of a clean new energy LED lighting system is changed to a DC drive circuit,using a dual-input step-down Cuk high-efficiency LED constant current drive circuit and MPPT control algorithm based on conductance increment.It not only improves the reliability and stability of the whole photovoltaic LED lighting system,but also realizes the functions of multi-input,step-down and low ripple DC drive.Finally,Saber software is used to simulate the dual-input step-down Cuk LED constant-current driving topology circuit.The simulation results are summarized and analyzed from the aspects of steady-state characteristics and system efficiency,which verify the validity of the theoretical analysis in this paper.