Application of MPPT technology in LED solar street lighting

In the traditional solar Led street light system, the solar panel and the battery are usually directly connected through the anti-current backflow diode, which will lead to low utilization efficiency of the solar panel, and at the same time, it is easy to make the battery under-charged for a long time, which reduces its service life. Based on the research of the solar cell circuit model, this paper proposes a digital-analog hybrid maximum power point tracking (Maxim Power Point Tracking, referred to as MPPT) strategy, which can maximize the use of solar energy, while driving the solid-state light source LED circuit Research has been done, and finally the efficiency and practicability of the scheme are verified by experiments.

With the development of solid-state light sources, the application of LEDs is no longer limited to the field of indicator lights. It has increasingly prominent advantages in modern lighting systems with its advantages of long life and high luminous efficiency. With the development of photovoltaic technology, high-power and high-brightness LEDs have further attracted widespread attention from all walks of life on the light source due to their high efficiency and energy saving. But at present, LED solar street lights still have disadvantages such as LED light decay phenomenon and low solar energy utilization rate caused by the lamp driving circuit. The industry generally believes that the constant current drive of LEDs has a significant effect on suppressing light decay.

In the traditional led solar street lamp charging system, the solar panel is usually directly connected to the battery through the anti-current backflow diode, which will cause the working point of the solar panel to deviate from the Maximum Power Point (MPP), and the solar panel is not effectively used. It can output power; at the same time, it is easy to make the battery under-charged for a long time due to insufficient energy supply, resulting in a shortened life. Based on the research of the solar cell circuit model, this paper analyzes the maximum power tracking (MPP Tracking, or MPPT) methods such as constant voltage tracking [1] and disturbance observation [2,3], and proposes a digital-analog hybrid MPPT strategy , It can stabilize the output of the solar cell near the MPP, thus effectively using the maximum power that the solar panel can output.

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