Solar LED solar lamps and lanterns use matters needing attention

The solar cell as a kind of new energy, first in terms of civil application in lighting lamps and lanterns. At present, in the western light engineering, the main solar street lights, solar garden lights and solar lawn lamp, solar lights, etc, the application of scale has been formed gradually. Involved in the design of solar lighting lamps and lanterns and light source, solar battery, storage battery charging and discharging control many factors, including any link problems will cause defects.

in this paper, the external characteristic of solar battery, storage battery charging and discharging control, solar lighting lamps and lanterns is often LED, compared with three colors efficient energy-saving lamps, analyzing their advantages and disadvantages and the use of occasions. At the same time, aiming at the problems existing in the solar energy lamp circuit design on the market puts forward improving methods. Because the solar energy lamp has a unique advantage, get rapid development in recent years.

lawn lamp power is small, mainly for the purpose of decoration, high requirement to the mobility, in addition, the circuit laying difficulties, waterproof demand is high, the above requirements made by the power supply of the lawn lamp solar cells can show many advantages like never before. Especially foreign market demand for solar energy lawn lamp than other products. In 2002, guangdong and shenzhen only used in the manufacture of export to the consumption of solar energy lawn lamp solar cells 2 mw, equivalent to the 1/3 of the domestic solar cell production, this year is still maintained a strong momentum of development, it is the unexpected. Solar garden light in the park, living community, and is widely used on the main traffic road. Development too fast, at the same time, because some products is technically not mature enough, in the selection of light source and there are many defects in circuit design, reduces the economy and reliability of the product, waste a lot of resources. In this paper, aiming at the problems above, proposed own view, provide the reference for the production of solar lamps factory.

1) LED the characteristics of close to stabilizing diode, working voltage change 0. 1 v, about 20 ma current job may change. For safety, normally use series current limiting resistor, great energy loss is obviously not suitable for solar energy lawn lamp, and LED brightness change with working voltage. The booster circuit is a good idea, you can also use simple constant current circuit, anyhow must automatic current limit, otherwise will damage the LED.

2) Generally LED the peak current of 50 ~ 100 ma, reverse voltage of 6 v or so, be careful not to exceed this limit, especially in solar cells reverse or battery, light, high peak voltage booster circuit, is likely to exceed this limit, damage to the LED.

3) LED temperature characteristics is bad, temperature 5 ℃, luminous flux fell by 3%, use should pay attention to summer.

4) Working voltage large discreteness, the same model, LED the working voltage of the batch has certain differences, should not be used in parallel. You have to use a parallel flow should be considered.

5) Super bright white LED color temperature of 6400 k to 30000 k. At present, the low color temperature of super bright white LED is still not to enter the market, thus made of ultra-high bright white LED solar lawn light penetration is poorer, so should pay attention to in the optical design.

6) Electrostatic had a great influence on ultra-high bright white LED, when installation should have anti-static facilities, workers should wear anti-static wrist. Ultra-high bright white LED by electrostatic damage might be naked eye look not to come out, but will shorten service life.