Working principle of solar street light

Solar energy is the most direct, most common and clean energy source on the earth. As a huge renewable energy source, solar energy reaches the surface of the earth every day equal to 250 million barrels of oil. It can be said to be inexhaustible and inexhaustible. exhaust. The spectrum of LEDs is almost entirely concentrated in the visible light frequency band, so the luminous efficiency is high. Most people think that energy-saving lamps can save energy by 4/5 is a great innovation, but LEDs are more energy-efficient than energy-saving lamps by 1/4, which is a greater solid light source reform.

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u003cbru003e 　　 Solar LED lighting integrates the advantages of solar energy and LED.

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u003cbru003e 　　1, system introduction

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u003cbru003e 　　1.1　Introduction to the basic composition of the system

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u003cbru003e 　　 system consists of solar cells

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u003cbru003e 　　 Battery is a device for energy conversion and storage, which converts chemical energy or physical energy into electrical energy through reflection. A battery is a chemical power source. It is composed of two electrochemically active electrodes with different compositions. The positive and negative electrodes are immersed in an electrolyte that can provide media conduction. When connected to an external carrier, it converts its internal chemical Can provide electricity. The component part (including the bracket), the LED lamp holder, the control box (with the controller and the battery) and the light pole are composed of several parts; the light efficiency of the solar panel reaches 127Wp/m2, and the efficiency is high, which is very beneficial to the wind resistance design of the system; In the lamp holder part, 1W white light LED and 1W yellow light LED are integrated on a printed circuit board and arranged in a dot matrix with a certain interval as a plane light source.

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u003cbru003e 　　 The control box body is made of stainless steel, which is beautiful and durable; maintenance-free lead-acid batteries and charge and discharge controllers are placed in the control box. This system uses valve-regulated sealed lead-acid batteries, which are also called maintenance-free batteries because they are rarely maintained, which is conducive to reducing system maintenance costs; the charge and discharge controller is designed with full functions (with light control, Time control, overcharge protection, overdischarge protection and reverse connection protection, etc.) and cost control to achieve a high cost performance.

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u003cbru003e Introduction to 　　1.2　 working principle

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u003cbru003e 　　 The working principle of the system is simple. The solar cell made of the photovoltaic effect principle during the day receives solar radiation energy and converts it into electrical output, which is stored in the battery through the charge and discharge controller. At night, when the illuminance is gradually reduced to about 101ux , The open circuit voltage of the solar panel is about 4.5V. After the charge and discharge controller detects this voltage, the battery will discharge the lamp cap. After the battery is discharged for 8.5 hours, the charge and discharge controller will act, and the battery discharge will end. The main function of the charge and discharge controller is to protect the battery.