A Solar Lawn Lamp Lighting Design Thinking Led The Solution
1 Introduction
1 Introduction
As a new green solar energy, with its unparalleled advantages in rapid application. As a fourth generation light source, in the city lighting and landscaping, street lighting, garden lighting, indoor lighting and lighting and other applications in various fields has been used effectively. Especially in remote areas without electricity, solar lighting and a more extensive application prospects. Most people believe that energy-saving lamps can save energy 4 / 5 is a great initiative, but also energy saving lamp LED than 1 / 4, which is a great innovation of solid light.
In addition, LED light also has a high quality, almost no radiation, reliable and durable, very low maintenance costs and other advantages, the typical green lighting. The successful development of ultra-bright LED, greatly reducing the cost of solar lamps use so-frequency alternating current at or near the beginning of the lighting system installed cost price, and protect the environment, ease of installation, operation safety, economic and energy saving. As the LED light with high efficiency, low heat advantage, has been increasingly used in the lighting field, and showed a trend to replace traditional lighting.
In western China, non-trunk solar lights, solar garden lights become the size. With the vigorous development of solar lighting, "green light" will become a trend. The LED solar lawn as one of the representatives will also be vigorously promoting and applications, this article introduces some of its knowledge, I hope to give you some inspiration.
2, LED solar lawn lamp, the definition and composition
Solar Lawn mainly to the use of solar energy to work, when the day sunlight in solar cells, the light energy into electrical energy stored in batteries, and then from the battery in the evening for the lawn of the LED (light emitting diode ) to provide power. The advantage is mainly for safety, energy saving, convenience, and environmental protection. Residential community green grass for decorative lighting, landscaping, parks and landscaping lawn ornament. LED solar lawn of the structure and composition: the solar modules (photovoltaic panels), ultra-bright LED lamp (light source), maintenance-free rechargeable battery, automatic control circuits, lighting and so on.
3, solar lawn system components, control theory and circuit theory
Solar LED garden lights are standalone power system. It can be done independently of the solar energy into electricity, and can convertelectrical energy into heat energy for lighting and decorative use, without the need for wire transfers. A stand-alone photovoltaic system generally consists of the following three components: solar modules; charge and discharge controllers, inverters, test instrumentation and computer monitoring and other power electronic equipment and batteries or other energy storage and auxiliary power generation equipment. PV system has the following characteristics: no moving parts, no noise; no air pollution, no waste water discharges; no combustion, no fuel; maintenance simple, low maintenance costs; reliability, good stability; as a key parts of the solar and long service life, life of crystalline silicon solar cells can reach more than 25 years; according to the size that are easy to expand power generation.
Solar garden lighting controller is mainly used to control battery charging and discharging. Figure 4-4 is a basic charge controller. In the figure, by the photovoltaic panels, batteries, solar controllers and load up a basic photovoltaic applications. Here the switch for the charging switch K1 and K3, K3 for the discharge switch, they belong to the solar part of the control center. The figure by the opening and closing the switch control circuit according to the system of charging and discharging state to decide. When the battery is fully charged, disconnect the charging switch is closed when the charging switch needs to be charged; closed when the battery discharge K2, otherwise disconnected. These control circuits can be used transistors, resistors, capacitors, inductors consisting of step-up charge and discharge voltage comparator circuit, the light control circuit can also be used, or the use of integrated operational amplifier constitutes a voltage comparator hysteresis can also be used microcontroller. Given the general use of the former low-cost considerations.
In general, a qualified solar charge controller has the following charge-discharge protection mode:
a direct charge voltage protection points: emergency charger, also known as charge, are fast charging, the battery voltage is generally lower when using relatively high current and high voltage on the battery charge, but there is a control point, also known as conservation sites is the value on the table, when charging the battery terminal voltage is higher than the value of these protections, they should stop the direct charge. Straight point voltage is generally sufficient to protect "overcharge protection point" voltage, charging the battery terminal voltage can not exceed the protection points, otherwise it will result in over charging, the battery is damaged.
Solar LED garden lights are charge control point voltage: direct charge after the battery charge and discharge controller will generally be standing for some time, let the natural voltage drop, the moment fall into the "recovery voltage" value, it will have full access to the state. Why are designed to charge? When the direct charge is finished, there may be individual cells, "backward" (relatively low voltage), in order to pull back these individual molecules, so that all of the battery terminal voltage with uniform consistency, so we'll accompanied by moderate to high voltage The current re-charge it for a little while, we can see all the so-called charge, that is "balanced charge." Are not too long filling time, usually a few minutes - ten minutes, the time set too long but harmful. Equipped with a battery of two small-scale systems, are fully meaningful. Therefore, the lamp controller are generally no charge, only two stages.
by: guoqiang
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