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Solar LED lighting technology requirements
2012-12-21 09:12:35


With the development and progress of solar photovoltaic technology, solar cells as a new energy in the civilian aspects of First used in lighting, solar lighting products due to the dual advantages of environmental protection and energy saving. Solar dimmable led bulbs products are a new generation of green lighting products, its main components, including solar photovoltaic cells (PV) and semiconductor lighting light source (LED). 
g24 led lamp integrated solar photovoltaic and LED solid-state lighting advantages of solar flat panel light system to achieve the perfect combination of a new generation of energy and new light source. However, in the design of solar lighting, involving light source, solar battery system, battery charge and discharge control many factors, any link problems are caused by defects in the product. 
A first look at the solar lighting: solar photovoltaic technology combined with best led replacement bulbs perfect lies both with DC low voltage and can match each other. Thus the combination of the two does not require the DC power generated by solar cells into alternating current, thus greatly improving the efficiency of the entire lighting system. 
At the same time, by means of grid technology or the use of battery charge and discharge energy to the more obvious advantages. Solar panels , charge and discharge controller 3 battery 4 load 5, the shell lamps designed to use should pay attention to the problem: the (LED lawn, for example) , the characteristics of the LED close Zener Diodes The working voltage changes 0,1 V, operating current may change 20mA. 
For safety, the ordinary case limiting resistor in series, and a great deal of energy loss is obviously not suitable for solar lawn lamps, and led replacement bulbs brightness changes with the operating voltage. The boost circuit is a good way, also can use a simple constant current circuit, short must be automatic current limiting, otherwise will damage the led corn light. 
General LED peak current of 50 ~ 100mA, Reverse Voltage 6V so be careful not to exceed the limit, especially in solar cells reverse or battery no-load, the peak voltage of the boost circuit is too high, it is likely to exceed this limit, damage LED. 
3.LED temperature characteristics is not good, temperature rise of 5 ° C, a decline of 3 luminous flux, summer degrees using pay attention to. 
4.the discrete nature of operating voltage, the same model, the same batch of LED operating voltage have some differences, and should not be used in parallel. Must be used in parallel, should consider both streams. 
5.super bright white LED color temperature 6400k ~ 30000k. Low color temperature ultra bright white LED yet to enter the market, manufactured with a super bright LED solar lawn lights penetrating power is relatively poor, so pay attention to the optical design. 
6.electrostatic ultra bright white LED great to have anti-static installation facilities, workers have to wear an antistatic wrist. Damage by electrostatic ultra bright white LED was probably their eyes can not see out, but life will be shorter. 
7.the system portfolio to pay attention to the photosensitive sensors, solar lamp light control switch, and some designers often use photosensitive resistor to automatically switch lights, solar cell itself is actually an excellent photosensitive sensors, with It do photosensitive switch characteristics better than photoresistor. 
For the application of solar garden is not a big problem, but for the mere use of a 1,2 VNi-Cd batteries, solar lawn lamp, solar cell device consists of four solar cells in series, the voltage is low, lower voltage under low light even the day did not the black voltage below 0,7 V, resulting in light control switch malfunction. 
In this case, add a transistor direct coupled amplifier, you can solve the problem. 8, according to the battery voltage level control load size, solar lights often consecutive rainy days can maintain time high, which increases the cost of the system. 
Consecutive rainy days, when the battery voltage decreases to reduce the number of access of LED or the energy-saving lamp, or to reduce solar lights a luminous time per day, which reduces the cost of the system. 9, flashing dimmer, dimming fade is a good way to energy-saving, one hand, it can increase the effect of solar lawn light irradiation, on the other hand can flicker by changing the duty cycle control battery average output current, and extend the system work time or Under the same conditions, and reduce costs. 
10.the switching speed of the three-color color energy efficient lamps. This issue is very important, it even determines the service life of solar lawn lamp, the start of the three-color color energy efficient lamps as high as 10 to 20 times the starting current, voltage will cause the system to withstand such a large current case dropped significantly solar lawn light can not start or repeated start, causing damage to the final. 
11.the solar cell is not able to use the main road lighting. The main road lighting illumination statutory requirements, is not able to meet this requirement, the conversion efficiency of solar cells and prices. With the improvement of all aspects of technical standards in the near future, solar cells will be applied to the main road lighting. 
12.on the storage capacitor, solar battery life of more than 25 years, the average battery life of 2 to 3 years, so the battery is the weakest link in the solar power system. The storage capacitor can solve this problem to some extent. The service life of the storage capacitor can reach more than 10 years, and the control circuit is simple, but the high price limits its application, currently only used in traffic lights and decorative lights. 
With the improvement of the technical level, the decline in the price of the product, it will be one of the most promising solar cells supporting ideal energy storage element. www.esd.cn In summary, the solar cell is a huge PN junction, which convert solar energy into electrical energy. LED is another possible electrical energy is converted to light the PN junction, its conversion efficiency has been improving, and I believe that soon we can achieve the level of energy-saving lamps, while life are able to reach more than 100,000 hours, this is the real meaning on the green lighting.

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