led street light fixture life and reliability evaluation
As a new type of green lighting product, led street light fixture has the advantages of high efficiency, durability, reliability, power saving, safety, etc., and has been widely used in modern urban road lighting. However, the longevity and reliability of the led street light fixture has been the focus of attention and discussion. This article will introduce the life and reliability evaluation of led street light fixture in detail from the following five aspects.
led street light fixture life
The life of led street light fixture refers to the time during the normal use of the product, due to aging, failure, damage, etc., so that it can not maintain the original performance or can not be used. There are three common led street light fixture life indicators, respectively, "average lamp life", "design life" and "typical life", which are introduced next.
1. Average lamp life
The average lamp life of led street light fixtures is that half of the led street light fixtures still work normally after a certain lifetime under standard conditions. At present, the average lamp life at home and abroad is usually set at 50,000 hours.
2. Design life
The design life of led street light fixture refers to the time that the designer anticipates that the led street light fixture can work normally under certain environmental conditions. At the same time, the design life should also take into account the average lamp life value error, environmental factors, chip reliability, PCB board design, cooling system design and other factors. In general, the design life should be no less than 2 times the average lamp life.
3. Typical life span
The typical life of a led street light fixture refers to the time that a led street light fixture can work normally under specific environmental conditions, which may vary depending on factors such as environment, installation, maintenance, and operating conditions.
led street light fixture reliability assessment
Reliability refers to the ability of led street light fixture to not fail in the design life under the specified environment and working conditions. Evaluating the reliability of led street light fixtures includes the following aspects:
1.LED chip reliability assessment
Chip reliability is one of the key factors in the reliability of led street light fixtures, which refers to the ability of the chip to not fail under specified operating conditions. The main factors to consider include voltage, operating temperature, current and so on.
2.PCB reliability evaluation
PCB reliability evaluation mainly includes welding, impedance, line width, capacitance, inductance, contact performance between components, etc.
3. Reliability evaluation of the heat dissipation system
Heat dissipation system is an important factor affecting the working life of led street light fixture, mainly considering factors such as radiator material, heat dissipation area, heat dissipation method and its ability.
4. System power reliability evaluation
The power supply of led street light fixture is one of the important factors that affect the stability and life of led street light fixture. For the system power supply, attention should be paid to the study of supply voltage fluctuation, short circuit, open circuit and other failures.
Factors that affect the life and reliability of led street light fixtures
Step 1: Temperature
led street light fixture is a semiconductor device, and its operating temperature has a direct impact on its life. Under normal circumstances, the working temperature of led street light fixture is controlled between -40℃ and +50℃. In order to improve the life, the temperature should be limited in a lower range, so as to extend its service life.
Step 2: Humidity
The electronic components and circuit boards of led street light fixture are very sensitive to wet environments, especially in the humid environment for a long time, components are prone to corrosion, which affects the life and reliability of led street light fixtures.
Step 3: Light
The working environment of led street light fixture also has an important impact on its life. The strong infrared light is harmful to led street light fixture. In general, it is necessary to ensure that the ambient light intensity of led street light fixture is not greater than 5000lux.
4. Power Supply
The power supply voltage stability of led street light fixture also has a great impact on its normal operation and life. In the case of stable power supply voltage, the working life of led street light fixture will be greatly extended.
Step 5: Material
The materials used in led street light fixtures also have an important impact on its service life and reliability, including aluminum alloy, cast aluminum, stainless steel and other materials.
led street light fixture life forecast
led street light fixture in the course of service life, its performance, brightness, wavelength will change, the forecast of led street light fixture life is to have the ability to carry out effective maintenance under the control of intelligent devices before its performance reaches the specified standard. The life prediction of led street light fixture can be divided into two methods: experimental prediction and simulation prediction.
1. Experimental prediction
Experimental prediction is to obtain the life information of led street light fixtures by performing accelerated life tests on a large number of led street light fixtures and recording their failure time, failure mode and other information. Then the data processing method is used to predict the life of a certain led street light fixture.
2. Simulation and prediction
Simulation prediction is to simulate led street light fixture with computer simulation method, and simulate the change rule of temperature, current, voltage and other parameters under different conditions. The failure time and failure mode of led street light fixture can be predicted.
Quality control for led street light fixtures
The quality control of led street light fixtures directly affects its life and reliability. In the production and use of led street light fixture, the following measures should be taken to strengthen the quality control of led street light fixture:
1. From the material, the use of high-quality LED chips, cooling materials, PCB board and other components.
2. Manufacture in strict accordance with the design requirements.
3. In the process of product storage and transportation, it is necessary to avoid the adverse environment such as mechanical vibration, humidity, and high temperature that affect the life of led street light fixtures.
4. During installation, operation and maintenance, all usage specifications of led street light fixture should be followed to prevent damage and failure caused by improper use.
To sum up, the life and reliability of led street light fixture is closely related to many factors such as the quality of the product, the working environment and the use and maintenance. In actual production and use, it is also necessary to carry out system maintenance and control on the life and reliability of led street light fixture in combination with the actual situation, so as to exert greater social and economic benefits of the product.