In today's world, major energy sources such as oil, coal, and natural gas are facing the danger of resource depletion. At the same time, environmental protection pressures are also increasing. Therefore, environmental protection and energy conservation have become the goals pursued by all walks of life in the world. Solar energy is a kind of clean green energy. Semiconductor light-emitting diodes (LEDs) are also environmentally-friendly, energy-saving, and efficient solid-state electric light sources.

In the past more than one hundred years, the lighting source has gone through three important stages: incandescent lamps, fluorescent lamps, HID lamps. The incandescent lamp is the first generation light source, the fluorescent lamp is the second generation light source, and the high intensity gas discharge lamp is the third generation light source (HID). Today, LED light sources with a broad development prospect in the lighting industry are called fourth-generation light sources. As a novel semiconductor light source, the LED has the characteristics of long life, high luminous efficiency, low power consumption, short start-up time, and firm structure.

1. The principle of solar photovoltaic power generation:

Solar photovoltaic power generation relies on solar cell components, utilizing the electronic properties of semiconductor materials. When sunlight shines on the semiconductor PN junction, a strong built-in electrostatic field is generated in the P-N junction barrier region, resulting in a potential barrier. Non-equilibrium electrons and holes in the region or non-equilibrium electrons and holes generated outside the barrier region but diffused into the barrier region are each moved in the opposite direction away from the barrier region under the action of the built-in electrostatic field. As a result, the potential in the P region increases, and the potential in the N region decreases, thereby generating voltage and current in the external circuit and converting the light energy into electrical energy. Solar photovoltaic power generation systems can be broadly classified into two types. One is a grid-connected power generation system, which is connected to the utility grid through a standard interface, like a small-scale power plant, and the other is a stand-alone power generation system, that is, on its own Circuits are formed inside the closed circuit system. The grid-connected power generation system converts the received solar radiation energy into high-voltage direct current through the high-frequency direct current through the photovoltaic array, and outputs the same frequency and in-phase sinusoidal alternating current to the grid voltage after the inverter is inverted. The independent power generation system photovoltaic array will first convert the received solar radiation energy directly into the electrical energy supply load, and pass the excess energy through the charge controller and store it in the battery in the form of chemical energy.

2. The advantages of LED lighting:

LED semiconductor lighting source has the advantages of long service life, high luminous efficiency, small size, light weight, environmental protection, safety and reliability. There is also a significant advantage that the LED ballast is not required because the LED startup voltage is consistent with the operating voltage. This saves cost and energy consumption, but also greatly reduces the response time of power-on and power-off.

3. The combination of solar energy and LED lighting

The key to the perfect combination of solar photovoltaic technology and LED lighting lies in the fact that they are both DC-powered, low-voltage and able to match each other. Therefore, the combination of the two does not need to convert the direct current generated by the solar cell into alternating current, thereby greatly improving the efficiency of the entire lighting system. At the same time, the advantages are even more obvious with the help of grid-connected technology or the use of batteries to store and dissipate energy. With the in-depth research of related technologies, LED's luminous efficiency is constantly improving, ultra-high brightness LED will come out, will inevitably replace the general lighting electric light source, and save a lot of energy and no pollution.

The ultra-high brightness LED is believed to be the mainstream of the future, and it can also drive the lighting fixtures to change. With the wind and solar energy, it will be a new indicator with a sustainable concept. This new model has already included testing applications in China, Europe, and Japan, and the pace of large-scale commercialization is accelerating.

Because the LED's operating current is DC, and the operating voltage is low. Solar cells convert light energy into DC power, and solar cell modules can be combined in series and parallel to get the actual voltage needed. These characteristics are exactly matched with the LED. The combination of the two will achieve high energy efficiency, high safety performance and reliability, and achieve energy-saving, environmentally-friendly, safe and efficient lighting systems, achieving a very perfect combination.

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