How to prevent lightning of solar landscape lamp
How to prevent lightning of solar landscape lamp
A considerable threat to outdoor LED lighting is the transient surge in AC power lines, especially lightning surge, which may cause damage to the lamps. Today, any LED lamp contains DC-DC power converter, LED driver, heat sink for thermal control and optical device for optimizing light quality. Lightning surge will cause faults to the internal components or circuits of LED lamps directly connected to AC input power supply (such as 120 / 220 VAC mains power supply), resulting in the damage of LED lamps due to short circuit and overload.
In recent years, a number of LED lighting enterprises, almost all of them are struggling with the cost, whether one SPD can solve all the surge problems: This is impossible. Lightning protection is a knowledge, a science, and an entire industry. It is wishful thinking to want a medicine package to cure all kinds of diseases.
Solar landscape lamp
Based on the academic and theoretical, such as: electromagnetic field theory, arc theory, electrical contact theory, electrical principle, power supply and distribution, communication theory, signal transmission and processing, advanced mathematics, etc., the main standards at present are iec61643, GB 18802, ul1449, etc. How can the standards be mixed? There is no comparability.
Our industry chain of lightning protection industry is divided into four levels
1. Material grade;
2. Component level;
3. SPD product grade;
4. External lightning protection engineering interface level.
The development of lightning protection industry has a history of more than 50 years in China, which is a complete and mature industry. We have been pursuing the integration of lightning protection industry and LED lighting industry, and ultimately bring reliable protection solutions to end customers. However, the reasonable lightning protection design is sentenced to death by a sentence of "cost" from the top of each company.
Indirect lightning induced surge
Due to the opening and closing action of nearby electrical equipment, overvoltage transient surge may occur on AC power line. Lightning strikes nearby can also produce transient surges on AC power lines, especially in outdoor environments.
Solar landscape lamp
At the moment of a lightning strike, the level of electrostatic discharge from the cloud to the ground usually reaches millions of volts. Lightning strikes occurring several miles away can induce induced voltages of up to several thousand volts on current carrying copper wires, such as underground cables for street lamps. These indirect shocks are characterized by specific waveforms that usually contain a large amount of energy in excess of 1000a2s.
About 70% of lightning strikes occur on land in the tropics, where most thunderstorms occur. African countries have experienced the worst and longest lightning strike in history. The most frequent lightning strike is located near kifka, a small village in the eastern mountainous area of the Democratic Republic of Congo, at an altitude of about 975 meters. On average, there are 158 lightning strikes per square kilometer per year in the region. A large area around the site has also been severely affected, as lightning induced surge impacts increase the risk of damage to outdoor LED lighting.
According to NASA's research on lightning frequency around the world, there are similar lightning frequencies in central and South America, Africa, South Asia and Southeast Asia. Therefore, in the United States, we suggest that the equivalent Surge immunity should be between 5ka and 10kA. For other regions with less lightning frequency, such as Europe, East Asia and Australia, low surge immunity from 3KA to 5ka can be considered.
In stormy weather, this type of indirect lightning energy will have adverse effects on outdoor LED lighting devices. Luminaires are vulnerable to damage in both differential mode and common mode conditions
Differential mode: high voltage / current transients between the phase and neutral terminals or between the phase and phase line terminals of the luminaire may damage the components in the power supply unit or LED module board.
Common mode: high voltage / current transients between the phase and ground or between the zero and ground wires of the luminaire may penetrate the safety insulation in the power supply unit or LED module board, including the LED radiator insulation.
