Conventional solar street lighting system, usually after anti-current flow backward diode solar panels and the battery is directly connected, which will lead to inefficient use of solar panels, easy to make the battery long owed to the fully charged state, resulting in the reduction of its life. On the basis of the solar cell circuit model of a mixed analog-digital maximum power point tracking (the Tracking Maxim Power Point, referred to as MPPT) strategy, it can be to maximize the use of solar energy, while the solid-state light source led 1w driver circuit do research, and experimental validation of the program's efficiency and practicality.
- I. Introduction
With the development of solid state light source, High Power LED 50W application is no longer confined to the light field, which by virtue of long life, light efficiency advantages in the modern lighting system has become more apparent superiority. Along with the development of photovoltaic technology, high-power high-brightness LED with high efficiency, energy conservation and lead to further widespread concern of the community on the light source. However, led 10w solar street lighting there is insufficient because of the lamp drive circuit to cause the LED light failure phenomena and solar energy utilization is not high. The industry generally believe that the constant current led power 10w a significant effect of inhibiting the light fades.
Conventional led power 50w light charging system, usually anti-current flow backward diode solar panels and the battery is directly connected, which will result in the maximum power point of solar panels operating point offset (MaximPower Point, referred to as the MPP), without the effective use of solar panels output power; easy to make the battery energy of less than a long period owing to the fully charged state, resulting in life reduced. In this paper, the solar cell circuit model based on the analysis of constant pressure tracing [1], perturbation and observation [2,3], the maximum power point tracking (MPP the Tracking MPPT) method, proposed a mixed analog-digital MPPT strategy , it will enable the output of solar cells is stable, in order to effectively use the maximum power output of solar panels near the MPP.