Design Analysis of Intelligent LED Solar Street Light Controller

The solar LED street lighting system adopts the complementary mode of commercial power, which has practical and economic significance for promoting the application of solar LED street lamps. In order to realize the complementary control of the commercial power of solar LED street lamps, a commercial street complementary LED solar street lamp controller was designed. The controller takes the ARM processor as the core, and samples the parameters such as battery voltage, solar cell voltage and ambient temperature to enter the ARM operation decision, which can realize high-accuracy control of temperature compensation correction, and has battery selection function and mains supply. Automatic switching function. The controller is applied to the retrofitting of street lamps, which can reduce one-time investment and achieve significant energy saving and emission reduction effects.

As a kind of “inexhaustible and inexhaustible” green and clean energy, solar energy is rapidly becoming widely used. LED has the characteristics of small size, sturdy and durable, low power consumption, long life, environmental protection, and good light color performance. The output of the solar cell is direct current, and the LED is also a direct current driving source. The two are easy to match, and the high utilization rate can be obtained, and the cost is reduced. Therefore, the LED solar street lamp has received more and more attention.

Because solar energy is restricted by weather factors, the distribution density of sunlight is small, and the time and intensity of light reception are random and intermittent. To ensure the stability of the output voltage of solar cells, it is necessary to use batteries to store electrical energy. Charge the battery and discharge the battery at night. If continuous rainy weather is considered, the battery capacity requirement is even greater, and the solar battery pack capacity is larger and the cost is higher. The solar LED street lighting system adopts the complementary mode of the city power to better solve this contradiction, and has practical and economic significance for promoting the application of solar LED street lamps.

1. The composition of the mains complementary LED solar street light system

The so-called mains complementary LED solar street light system is based on solar cell power generation, supplemented by ordinary 220V AC power supplemented LED street lighting system. With this system, the photovoltaic battery pack and battery capacity can be designed to be smaller, basically There was sunshine during the day, and solar energy was used to charge the battery at the same time. When it was dark, the battery discharge turned the load LED on. In most parts of China, there are basically more than 2/3 of the fine weather throughout the year, so that the system has more than two-thirds of the time to illuminate the streetlights with solar energy, and the remaining time is supplemented with energy from the mains, reducing The one-time investment in solar photovoltaic lighting system has significant energy saving and emission reduction effects, and is an effective method for promoting and popularizing solar LED street lighting at the current stage.

LED solar street light system is shown in Figure 1. It consists of five parts: solar cell, street lamp controller, battery, mains supply, switching power supply and LED street light. Among them, the street lamp controller is the control core of the whole system, which is used for charging and discharging control of the battery, lighting control of the LED street lamp, automatic switching control of the mains power supply and related protection control; solar cells are used to convert solar energy into electric energy And the street lamp controller determines whether it is day or night by collecting the voltage of the solar cell; the battery is the energy storage device of the whole system, the solar battery charges the battery during the daytime, and the LED street lamp is powered by the battery at night or in the rainy day, and the street lamp is controlled The device can collect the battery voltage and switch to the mains supply when the battery is insufficiently powered.

Figure 1 Mains complementary LED solar street light system

　 2, street lamp controller hardware design

The hardware block diagram of the solar street light controller is shown in Figure 2. It is mainly composed of power input, data acquisition display control, ARM processor and output. The controller takes the ARM processor as the core, collects the battery voltage, solar cell voltage, ambient temperature and other parameters through the ARM microprocessor, and makes the ARM operation decision, selects the temperature compensation parameter that meets the battery characteristics, and realizes high-accuracy control. At the same time, adopts The intelligent and efficient PWM fuzzy charging method charges the battery to ensure that the battery works optimally. The controller has buttons and display circuits, which can easily set the operation mode and operating parameters, and the display circuit can also visually display the current operating status.

Figure 2 Hardware block diagram of the solar street light controller

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