LED large screen security is also very important

Recently, there have been many large LED screens on the roadsides, squares, and in front of stores in the city. Due to the decline in the price of LED electronic large screens, many businesses can afford them. Installing LED screens not only advertises itself, but also provides The city adds brilliance, although the LED electronic screen has brought the vitality of the city, but the security cannot be ignored. This kind of crisis is the hidden danger of fire. A large LED screen newly installed in a building caught fire after a short running time. The technicians were very confused because the design and construction were strictly implemented in accordance with the specifications, and there were perfect procedures on the lines. The current protection device will automatically cut off the power supply when the line is over-current. When firefighters analyzed the cause of the fire, there was no strong evidence to clarify the real cause. In fact, it is quite natural that people do not understand this phenomenon because it is a completely new phenomenon. This phenomenon is called harmonic current phenomenon. Harmonic current is a kind of high-frequency current, which is mainly produced in modern high-tech electronic equipment. One of the main hazards of harmonic current is to induce fire. Harmonic currents are generated when any high-tech electronic device is working, just like any car generates exhaust. Why do high-tech electronic devices, including LED electronic large screens, generate harmonic currents? This is because any electronic device contains a rectifier circuit, and when the rectifier circuit is working, it will generate harmonic currents, just like the exhaust gas emitted by a gasoline engine. Same. Electronic devices rely on complex electronic circuits to work, and these electronic circuits are powered by direct current. Since the power plant sends out alternating current, electronic equipment must rectify the alternating current and transform it into direct current before it can be used. The LED screen is a complex electronic device, which contains a large number of rectification circuits, so it generates a large harmonic current. Due to the popularization of electronic information equipment in recent years, people are still immersed in enjoying the convenience brought by electronic technology, and they are far from aware of the harm they bring. Just like a few years ago, people fully enjoyed the convenience brought by cars, while ignoring the consequences of air pollution and road congestion. In fact, the harm of harmonic current has become increasingly serious, and has caused a non-negligible impact on the safety of electricity consumption in the whole society. .