Perhaps I heard the story of the process of microwave oven invention, a radar expert Spencer found the chocolate in his pocket when debugging the microblog generator, and then he tested it with corn, eggs, etc., and finally finally A microwave oven was invented, of course, this is a microwave that compares a specific band. But it can be seen that microwave (electromagnetic radiation) is a kind of powerful energy!
We do not discuss whether the LED light source itself has electromagnetic radiation (in fact, the microwave radiated by the LED is between 380 nm and 760 nm that our eyes can recognize, and the radiation of other bands has not been reported yet), but it is well known that LED is a kind of The solid-state semiconductor light source is a kind of low-voltage electronic product. The 220-volt AC power supply must be stepped down and rectified to meet the LED driving demand. How many drivers are needed in the CCTV "News Network" lobby? ? The electromagnetic radiation generated by each drive may be minimal, but will the accumulation of electromagnetic radiation in such a limited space exceed the load capacity of the human body?
There were foreign customers who reported that when the concert was opened, the wireless microphone would be interfered whenever the LED display was turned on. Therefore, they asked for the LED display to pass the EMC test and certification. This is a very troublesome thing. Very complicated technology, few LED displays have passed EMC certification. High-density LED display P2.5 (that is, LED spacing is 2.5 mm, 160,000 points per square meter), such a high density, its refresh rate can be imagined, according to the formula E = hv (H is Planck Constant, V is the electromagnetic wave frequency), that is to say, the higher the refresh frequency is, the larger the electromagnetic radiation energy is. The two pins of the LED act as radiating antennas (160,000 small antennas per square meter are terrible), just in direct sunlight. The time the staff working in it, if this radiation is unshielded and reduced, how terrible it is. In this kind of environment, if the visual effect of distortion or interference of the speaker effect is caused, it will attract attention. If there is no intuitive feeling that affects the sound effect, it may be completely ignored by the people, that is, the person working in it is not aware of it. Damaged by electromagnetic radiation.
In the past, traditional lamps used 220V or 110 volts of power at 50 Hz (Western 60 Hz), so the impact on radiation is negligible, and now the emergence of LED lighting products, especially the large number of poor LED drivers Appear, whether we need to consider the impact of electromagnetic radiation on LED products.
Of course, low-density LED application lighting, LED outdoor display does not have to consider so much, but in the high-density space of LED applications, electromagnetic radiation detection should be an integral part.
Although the influence of electromagnetic waves on the human body is still in dispute, the controllable electromagnetic radiation is absolutely inevitable until the final conclusion is reached.
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