Looking at LED driver power safety standards by "Apple Electric Death Incident"

[Text / high-tech LED reporter Zhu Chunwei] In July, the hottest vocabulary of the Internet was the "Apple Electric Death " incident. A flight attendant of a China Southern Airlines flight attendant was called to death on the spot using a charging Apple mobile phone. For a time, the safety of this kind of low-voltage power supply product has once again become the focus of hot discussion. Will the LED lighting driver power supply with DC power supply also be dead? How to ensure its safety?

LED is the abbreviation of light-emitting diode. A solid-state semiconductor device can convert electric energy directly into light. Like many electronic components, it uses a constant current DC power supply. The working voltage is 1.8V-3.6V, and the current is about 20MA. But now we use the thermal power, water and electricity, etc. are AC, the voltage is generally 220V, LED must be converted to use, this time driving power is particularly important.

"On the case of Apple's mobile phone, we analyzed that the possible problem is that it appears in the transformer or the safety capacitor, that is, the Y capacitor." Shenzhen Gang Lutong Electronic Technology Director Mao Gang told the Gaogong LED reporter, "The transformer is big." Both current breakdown and Y-capacitor damage can cause leakage and injury, and LEDs are the same."

Mao Gang revealed that in order to ensure the safety of LED drive power, in addition to the use of high-quality raw materials, the process can also be improved. For example, the safety capacitor can be connected in series. Even if one capacitor has a problem, the other can work normally to ensure that there is no human body electric shock. Although the current safety device manufacturers have made quality assurance, there will still be some problems. It is necessary to exclude this one-tenth of the possibility and give the power supply a "double insurance".

When talking about the safety of LED power supply, Chen Zhongzhi, director of photoelectric technology at Leyford, said that the role of the power supply must overcome the potential threats, such as radiation, interference to the power grid, in addition to lighting an LED. Factors that need to be circumvented in the event of an emergency, which requires the company to strictly enforce various standards and conduct rigorous testing and verification of the product.

According to Professor Tong Tongsheng, the person in charge of the development of international standards for LED technology safety performance, the new mandatory national lighting safety standards are under development and are expected to be introduced next year. At that time, it will solve the situation that the safety of LED lighting products in China has no standard for a long time.

The reporter learned that after the new safety standards are promulgated, consumers will see the “Zero Class” or “Class 1” signs when they buy the lights. For lamps with light source greater than Class II, there will be signs to remind “Do not take off when cleaning. The lampshade has a warning such as "Children should not look directly at the light source".

There is no similar safety incident in LED lighting, but the lessons of the previous car cannot be ignored. From the source, we will control it and give consumers a good product with peace of mind. This requires our power companies and LED companies to work together to be a responsible company.

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