Some problems in the practical application of LED driver power supply

With the rapid development of the city, the daytime and nighttime environment of the city is constantly improving. Landscape lighting has brought vitality and vitality to the night of the city, so the function and function of landscape lighting have received widespread attention.

Landscape lighting is an important part of the public lighting system, and a good public lighting system is conducive to the formation of a positive urban image.

After years of application of technology accumulation, LED lighting is now basically mature. In the lighting industry, LED lighting has been applied on a large scale, and it has entered a period of rapid development.

LED landscape lighting requires reliable electrical protection and uses LED driver power supplies that comply with relevant national regulations and standards.

However, there are still some problems in the practical application of LED landscape lighting. Such as LED drive power requirements, including high efficiency, high power factor, high current control accuracy, high reliability, safe isolation, EMI compliance, small size, low cost.

The main performance is as follows:

In the event of electrical failure of the lighting circuit and the LED drive power supply, in order to prevent personal electric shock, electrical circuit damage and electrical fire, short circuit protection, overload protection and grounding protection shall be provided to cut off the power supply or send an alarm signal.

In order to achieve this, fuses, circuit breakers and residual current protectors are generally used for protection.

To select the corresponding LED driver power supply, pay attention to the following three points:

1, try to use LED drive power with electrical isolation

2. The insulation resistance of the live part and the ground end of the LED drive power supply is greater than 2MΩ.

3. The metal casing part of the LED drive power supply must be reliably grounded and clearly marked.

LED landscape lighting in outdoor applications, must pay attention to waterproof, water penetration will lead to short circuit of LED drive power. In order to be rigorously waterproof, manufacturers will use a variety of waterproof components, whether it is the design of the outer casing or the internal potting, generally in strict accordance with the IP65 or even IP67 level requirements. But why is it that some LED drive power supplies are damaged by waterproof? The reasons are as follows:

1. The construction personnel at the landscape lighting construction site did not have professional training. When installing the LED driving power supply, they did not operate according to the requirements of the manual. The installation angle, position, environment, wiring, sealing and other problems occurred, which eventually led to the use. Waterproofing problems occur during the process.

2, select the inferior LED drive power that does not meet the waterproof level requirements. The shell material of such inferior LED drive power is rough, the assembly is irregular and the gap is filled with water. The inside of the power supply is made of potting glue with poor waterproof performance, and some have internal filling half. Glue or even no glue, which can not effectively prevent the components on the PCB from being damaged by contact with water.

3. It is not used according to the restricted use conditions of the product. The environment used exceeds the protection level of the product, resulting in successive damage of the final product during use.

The natural phenomenon of lightning strikes during the rainy season is particularly common and can have a fatal effect on the power supply. Therefore, lightning protection design, for outdoor LED power supply, must be considered.

LED driver power supply According to the relevant international standard IEC61000-4-5, the input port must meet the requirements of this standard: it can withstand the wave between line and line 2KV, line to ground 4KV (ie differential mode 2KV, common mode 4KV standard) Surge. At the same time, this is also required for the AC power port of LED lamps. In order to solve this contradiction and improve the reliability of products, many LED outdoor lamps are often solved by increasing the internal lightning protection level of the LED driving power supply or adding a separate surge suppressor.

In terms of the correct installation and use of the LED driver power supply, there are also some matters worth noting. The following several methods can effectively avoid the surge of operation, so that the LED driver power supply can work more reliably:

1. The power supply must be grounded reliably to ensure that the impact energy has a fixed path to vent.

2. Use dedicated lines to supply power to the LED outdoor drive power source to avoid large-scale electromechanical equipment in the vicinity to avoid surges when the electromechanical equipment starts or shuts down.

3. Reasonably control the total load of the lamps (or power supply) on each branch to avoid the surge impact caused by the load being too large.

4, reasonable configuration of the knife, open or closed must be carried out step by step.

1. Confirm that the driving voltage and current required for the serial number of the LEDs of the lamp are within the nominal range of the output parameters of the LED driver. If it exceeds the nominal range, it may cause a flashing problem.

2. Confirm the wiring voltage drop range in the entire lighting circuit, that is, measure the actual voltage of the lamp string farthest from the LED driving power source, and the voltage drop of the wiring should be within the maximum output voltage range of the LED driving power supply. If the maximum output voltage of the LED drive power is exceeded, the light will flash.

3. Confirm that the working environment of the LED driving power supply is in line with the requirements of the manual. For example, the range of the input AC voltage, the input voltage that is too high or too low will trigger the undervoltage and overvoltage protection of the LED driving power supply; the working ambient temperature has been dissipated. The environment, the working environment temperature is too high or the heat dissipation environment is not ideal. For example, the heat-dissipating environment such as airtightness and airless circulation may trigger the overheat protection circuit of the LED driving power supply, causing the light to flash.

4. Confirm whether the control system or the dimming system matches the LED driving power. Different control systems or dimming systems have different requirements for the LED driving power supply, mainly pay attention to the protocol of the control port, and the voltage amplitude of the dimming port. Value, frequency, interface compliance.

LED landscape lighting intelligent control system, including PC interface, main controller, several drives, dual-core bus connecting these modules, and dedicated management software for landscape functions and parameter settings. It is a new control system designed to meet the increasing demand for urban landscape lighting and the requirements of “green lighting engineering”.

Landscape light control system, with wireless remote control, telemetry, remote signaling and other three remote functions, using digital, intelligent, modular data acquisition terminals, wireless network connection with the host computer, the central control room is equipped with a centralized monitoring system Through the mobile phone and map interface, the management personnel control and manage the landscape lighting and lighting lighting centralized control system of the entire city, and also has on-site manual control functions.

Therefore, the LED driver power supply and the control system match, pay attention to the following four problems:

1, the system interface and communication protocol need to match

2. The safety regulations of the system need to comply with relevant standards and regulations.

3. The installation of the system needs to meet the requirements of its environmental conditions.

4, the system's anti-theft problem

The performance that affects the life of an LED driver, including: environmental characteristics, component characteristics, and power characteristics.

The specific performance is as follows:

1. High-humidity environment, high-temperature environment, dusty environment, strong magnetic environment and vibration environment all have an impact on the final life of LED drive power.

2. The voltage input of the unstable power grid will impact the components of the LED power supply, thus affecting the service life of the LED driver.

3. The LED drive power supply has a capacitor input type rectification loop inside. When the power is turned on, a surge current is generated. This surge current will impact the internal components of the power supply, thereby affecting the service life of the LED drive power supply.

4, the correct installation of the product and good insulation will enhance the vitality of the LED power supply.

5, the internal temperature of the lamp is less than 65 degrees, the lamp housing is less than 75 degrees, and the power supply temperature is less than 60 degrees is the basic requirement. Because not only the power supply itself will generate heat, but also the lamps will heat up. How to properly dissipate these two heat sources is a problem that the lighting design engineer must consider. It is necessary to prevent excessive heat concentration, form a heat island effect, and affect the life of the power supply.

6. When the internal temperature of the electrolytic capacitor becomes high, the sealed portion of the electrolytic capacitor will leak out the vaporized electrolyte. This phenomenon will accelerate as the temperature rises. It is generally considered that the temperature will increase to 10 °C. 2 times, which means that its life will be shortened by 2 times. Therefore, it can be said that the electrolytic capacitor determines the life of the LED driving power source.

The beautiful night view of the modern city relies on the outdoor LED landscape lighting to reflect the cultural taste of the city. It needs scientific planning, ingenious planning and perfect design to achieve harmony between people and the environment. At the same time, we must pay attention to the problems in the control system and LED drive power in the application process, improve its reliability, so that it can bring a beautiful landscape to the city night.

Urban landscape lighting has an important role and significance for the improvement of the overall night image of the city.

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