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Discussion on the common problems of driving power in LED landscape illumination

Jun 19, 2017

With the development of social economy and the improvement of people's quality of life, people have put forward more and more demands on the urban environment, and the urban landscape lighting, as a symbol of urban development, has been paid more and more attention. Landscape lighting is an important part of public lighting system, good public lighting system helps to form a positive city image, not only beautify the urban environment, but also reflect the city's economic strength and modernization level.

LED lighting After many years of application technology accumulation, has now been basically mature, in the lighting industry has been a large-scale application, has entered a high-speed development period. LED landscape lighting can also be said to be a kind of art, is the city's historical heritage of an art embodiment, lighting art, the need for reliable electrical protection, the selection of relevant national laws and regulations and standards of LED-driven power supply, however, there are some problems in practical application, such as high efficiency, high power factor, high current control precision, high reliability, safe isolation, compliant with EMI standard, small size and low cost, the main performance is as follows:

The safety of landscape lighting system

People-oriented, in the landscape lighting place, should be the personal safety as the first factor, the selection of the driving power supply must meet the corresponding safety standards, in the installation of the construction process, must be in strict accordance with the manufacturer's manual, and related operational guidelines for the operation and construction of the standard; when the lighting line and led driving power supply occurs in the electrical fault, in order to prevent personal shock, electrical wiring damage and electrical fire, should be set short circuit protection, overload protection and grounding protection, to cut off the power supply or send alarm signal. In order to achieve this, the fuse, circuit breaker and residual current protector are generally used for protection.

The selection of the corresponding led driving power supply is to pay attention to the following aspects:

Shan, as far as possible with electrical isolation of the LED driving power supply.

Shan, led driving power supply of the electric part and the grounding end of the insulation resistance is greater than 2m.

Shan, led driving power of the metal shell part must be reliable grounding, and there is a clear identification.


Second, led driving power supply waterproof failure problem

In outdoor LED landscape lighting applications, to pay special attention to the problem of waterproof, because the infiltration of water may cause the LED power supply short-circuit and damage. In order to strictly waterproof, manufacturers will use a variety of waterproof components, whether the design of the shell or the internal potting, in general will be strictly in accordance with the IP65 and even IP67 of the grade requirements to do, but in the actual use of the LED driver is still a part of the phenomenon of waterproof and damage, the reasons are as follows:

Shan, in Landscape lighting construction site construction personnel did not undergo professional training, in the installation of LED driving power when not in accordance with the requirements of the manual operation, the installation of the angle, location, environment, wiring, seals and other problems, resulting in the use of the process of waterproof problems.

Shan, choose the poor quality led driving power which does not meet the waterproof grade requirement, this kind of poor quality led driving power supply shell material rough, assembly irregular lead to gaps in the water, the power supply internal use of waterproof performance of the potting adhesive, some of the internal potting or even do not glue, resulting in the PCB can not effectively prevent the components and water contact and damage.

Shan, not in accordance with the product restrictions on the use of conditions, the use of the environment beyond the protection of the product level, resulting in the final product in the use of the process has been damaged.

Third, led driving power supply lightning surge failure problem

Lightning strikes are a common natural phenomenon, especially in the rainy season. According to statistics, the harm and loss caused by the world is estimated at $ hundreds of millions of annually. Lightning strike is divided into direct lightning and indirect lightning strike, indirect lightning mainly includes conduction lightning and inductive lightning strike. Because of the energy impact of direct lightning is very large, destructive extremely strong, general power supply is unbearable. Therefore, we often say that lightning protection is mainly for indirect lightning.

The surge impact caused by lightning strikes is a transient wave, which is a kind of transient disturbance with a subtle duration, which can be surge voltage or surge current. Transmitted to the power line along the power cord or other path (conduction ray) or through an electromagnetic field (inductive ray). The waveform is characterized by a rapid rise and then a gradual decline. This phenomenon will have a fatal impact on the power supply, lightning protection design for outdoor LED power supply is necessary to consider.

LED drive power supply according to the relevant international standard Iec61000, the input port shall meet the requirements of this standard: can withstand the line and line between 2KV, line and between 4KV (that is, differential mode 2KV, common mode 4KV standard) surge impact. At the same time to the LED lighting AC power port also has this requirement. In order to solve this contradiction, improve the reliability of the product, many led outdoor lamps are often by improving the LED driving power of the internal lightning level, or add an independent surge suppressor to solve.

In addition, there are a number of considerations for the correct installation and use of LED-driven power supplies. If the power supply must be reliably grounded to ensure that the impact energy has a fixed path can be released, the use of dedicated circuit for LED outdoor driving power supply, to avoid large-scale mechanical and electrical equipment around, in order to avoid surge impact when electromechanical equipment starts or shuts down, reasonable control of the total load of the luminaire (or power supply) on each road, avoid the surge impact caused by the load too much, and the reasonable configuration of the knife, on or off. These can effectively avoid the operation of surge impact, so that led driving power can be more reliable work.


Four, LED flashing problems

First of all, the identification of the lamp led string and the number of required driving voltage and current, whether in the LED driving power output parameters within the nominal range, if the exceeding nominal range may cause flicker problems.

Secondly, confirm the range of the wiring pressure drop in the whole illumination circuit, in other words, the measurement distance led driving power of the lamp bead string of the actual voltage, coupled with the pressure drop of the wiring to the maximum output voltage of the LED drive power supply, if the maximum output voltage exceeding the LED drive power will cause the lamp flash.

Once again, to confirm the working environment of LED driving power is very consistent with the requirements of its instructions, such as input voltage range, too high or too low input voltage will trigger the LED driving power supply under voltage and over-voltage protection; The working environment temperature has already cooled the environment, the working environment temperature is too high or the heat dissipation environment is not ideal, such as airtight, the air does not circulate and so on the heat dissipation environment may trigger the led to drive the power supply overheat protection circuit, thus causes the lamp to flash.

Finally, confirm whether the control system or dimming system and led drive power supply match, different control system or dimming system on the LED driving power supply has different requirements, mainly note that the control port protocol to conform to, dimming port voltage amplitude, frequency, interface compliance.

V. The problem of the matching of LED driving power and control system

LED landscape Lighting Intelligent control system is to meet the increasing demand for urban landscape lighting and the "Green lighting Engineering" requirements of the design of a new control system. It includes PC interface, main controller, several drives, dual-core bus connecting these modules and special management software for landscape function and parameter setting.

The control system of landscape lamp has the function of wireless telecontrol, telemetry, tele-letter and so on, using digital, intelligent, modular data acquisition terminals, with the host computer between the use of wireless network connection, the total control room with a centralized monitoring system, management staff through the mobile phone and map interface controls and manage the city's landscape lights, lighting centralized control system, but also has the Field manual control function. Therefore, the LED driving power and control system matching to pay attention to the following issues:

Shan, led drive power and control system interface and communication protocol need to match.

Shan, led driving power supply and control system safety regulations need to meet the relevant standards and regulations.

Shan, led driving power supply and control system installation need to meet the requirements of their environmental conditions.

Shan, System anti-theft problem.


VI. LED DRIVING power supply life

LED driving power supply life is greatly affected by the life of LED lamps, so the choice of life-long led driving power supply, has become the key to enhance the life of the lighting system.

For the life of LED power supply itself, the performance of its life-span includes three aspects: environmental characteristics, component characteristics and power characteristics, which are shown in the following aspects:

Shan, the impact of practical application environment: high humidity environment, high temperature environment, dusty environment, strong magnetic environment, vibration environment will have an impact on the final life of LED driving power supply.

Shan, LED lamps and lanterns temperature environment influence: the lamp inside temperature is less than 65 degrees, the lamp shell is less than 75 degrees, the power supply temperature is less than 60 degrees is the basic request. Because not only the power itself will be hot, lamps will also heat, the two kinds of heat source how reasonable to emit out is the lamp design engineer must consider the problem, must prevent the excessive concentration of heat, form the heat island effect, affect the power supply life.

Shan power grid impact: The voltage input of the unstable power grid will impact on the components of the LED power supply, thus affecting the life pulse of the LED driving.

Shan insulation and Installation impact: the correct installation of products and good insulation will enhance the vitality of LED power supply.

Effects of Shan electrolytic capacitors: When the internal temperature of the electrolytic capacitor is higher, the sealing part of the electrolytic capacitor will leak out of the gasification of electrolyte, this phenomenon will accelerate with the increase of temperature, generally think that the temperature of every 10 Shan, leakage rate will increase to twice times, that is, its life expectancy will be shortened by twice times. So it can be said that the electrolytic capacitor determines the life of the LED power supply.

Shan switch number of effects: LED driving power supply with capacitor input rectifier circuit, in the access to power, will generate inrush current, the surge current will have an impact on the internal components of the power supply, thus affecting the LED driving power supply life.

In short, the beautiful night scenery of the modern city, depending on the outdoor led landscape lighting to foil, embodies the city's cultural grade, it needs to be scientifically integrated, ingenious planning and perfect design to achieve harmony between man and environment. At the same time, we must pay attention to the problems of controlling system and led driving power in the application process, improve its reliability, so that it can bring a beautiful landscape to the city night, because the landscape lighting is endowed with a lot of positive moral, streamer overflow color, colorful, not only revealed the vitality of the town, the spirit of positive enterprising, but also symbolize the peace, flourishing prosperity of the good wishes.

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