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The lawn lamp is a kind of both lighting and beautification function of lamps, in the town a lot of need lighting of public occasions can see it. Generally speaking, most of the lawn light is solar LED lawn lamp.
Advantages of the lawn lamp
Caoping Deng use LED as a light source, LED long life, can reach more than 100,000 hours, the working voltage is low, very suitable for use in solar lawn light. In particular, LED technology has gone through its key breakthroughs, and its characteristics in the past 5 years has greatly improved, its cost performance is also greatly improved. In addition, LED by the low-voltage DC power supply, the light source control costs low, so that regulation of light and shade, frequent switching are possible, and will not adversely affect the performance of LED. But also can easily control the light color, change the classification of light, resulting in dynamic illusion, so it is particularly suitable for solar lawn light.
Solar lawn light source and power system design methods due to the unique advantages of solar lawn, in recent years has been rapid development. Lawn light power is small, mainly for the purpose of decoration, high mobility requirements, the circuit laying difficulties, high water requirements for the site. These make the solar-powered lawn light show many unprecedented advantages.
The development trend of solar LED lighting
Solar energy as a new green energy, with its unparalleled advantages of the rapid promotion and application. As the fourth generation of new light source, in the city Lianghua landscaping, road lighting, garden lighting, interior lighting and other areas of lighting and applications have been effectively used. Especially in remote areas without electricity, solar lighting has a wider range of applications. Most people believe that energy-saving lamps can be energy-saving 4/5 is a great initiative, but also energy-saving lamps than the energy-saving LED 1/4, which is a great innovation solid light source. In addition, LED also has high light quality, basically no radiation, reliable and durable, very low maintenance costs and other advantages, are typical of green lighting. Ultra-bright LED successfully developed, greatly reducing the use of solar lighting costs, to reach or close to the frequency of AC lighting systems installed cost of the initial installation, and has the protection of the environment, installation is simple, safe operation, economic and energy-saving advantages. As the LED has high light efficiency, low heat advantages, has been increasingly used in the field of lighting, and presents a trend to replace the traditional lighting sources. In western China, non-main road solar street lights, solar garden lights gradually become the scale. With the vigorous development of solar lamps, "green lighting" will become a trend.
Advantages and Application of Lawn
The main advantages of lawn lamp for safety, energy saving, convenience, environmental protection. Suitable for residential community green grass landscaping lighting embellishment, park lawn embellishment.
Several Problems of Solar Energy Combined System for Lawn
(1) photosensitive sensor. Solar Caoping Deng need to light control switch, designers often use photosensitive resistance to automatically switch lights, in fact, the solar cell itself is an excellent photosensitive sensor, use it to do photosensitive switch, better than the photosensitive resistor. For a solar lawn lamp using only a 1.2V Ni-Cd battery, the solar cell module is composed of four solar cells connected in series. The voltage is low and the voltage is lower in the low light, so that no black voltage has been lower than 0.7V. Light control switch failure. In this case, as long as a transistor coupled with a direct amplification, you can solve the problem.
(2) according to the level of battery voltage control load size. Solar lawn light is often a continuous rainy time to maintain a high demand, which increases the system cost. We reduce the number of LED accesses when a continuous rain-cell voltage drops, or reduce the daylighting time of the solar lawn light, thus reducing system cost.
(3) solar cell packaging. At present, there are two main types of solar cell packaging, laminating and Dijiao. Lamination process can ensure that the working life of solar cells more than 25 years, Dijiao Although beautiful at the time, but the solar cell life of only 1-2 years. Therefore, the following 1W low power solar lawn lamp, in the absence of high life requirements, you can use the Dijiao package form, for the life of a solar lawn, the proposed use of laminated packaging.
(4) flicker change light. On the other hand, it is possible to control the average output current of the battery by changing the flicker duty cycle, to extend the working time of the system, or to reduce the working time of the system under the same conditions. Solar power, the cost will be greatly reduced.
(5) three-color color energy-saving lamps of the switching speed. This problem is very important, it even determines the life of solar lawn light, three-color-color high-performance energy-saving lamps start up to 10-20 times the starting current, the system to withstand such a large current situation may have a significant voltage drop, Solar lawn light can not start or repeated start until the damage.
(6) boost the efficiency of the circuit and the impact of LED lights. Low-power solar lawn generally have booster circuit, if the oscillation circuit, inductor boost. Inductor using standard color code inductor, standard color code inductor using open magnetic circuit, magnetic flux loss, so the circuit efficiency is low. If the use of closed magnetic circuit manufacturing inductor boost, such as magnetic ring, boost circuit efficiency will be greatly improved. LED characteristics close to Zener diodes, the operating voltage change 0.1V, operating current may change about 20mA. For safety, the use of series current limiting resistor under normal circumstances, a great loss of energy is clearly not suitable for solar lawn, and LED brightness changes with the operating voltage, and must automatically limit, otherwise it will damage the LED. General LED peak current 50-100mA, reverse high-energy battery or battery load, boost circuit peak voltage is too high is likely to exceed this limit, damage the LED.