Views: 330 Author: Site Editor Publish Time: 2020-04-02 Origin: Site
LED (Light Emitting Diode), a light-emitting diode, is a solid-state semiconductor device that can convert electrical energy into visible light. It can directly convert electricity into light. The heart of the LED is a semiconductor wafer. One end of the wafer is attached to a bracket, one end is the negative electrode, and the other end is connected to the positive electrode of the power supply, so that the entire chip is encapsulated by epoxy resin. A semiconductor wafer is composed of two parts, one is a P-type semiconductor, in which holes dominate, and the other is an N-type semiconductor, which is mainly electrons. But when these two semiconductors are connected, a P-N junction is formed between them. When a current is applied to the chip through a wire, the electrons are pushed to the P region, where the electrons and holes recombine, and then energy is emitted in the form of photons. This is the principle of LED light emission. The wavelength of light, which is the color of light, is determined by the material that forms the P-N junction.
It is because of this structure that LED lamps have good shock resistance and high lumen. They have replaced traditional incandescent fluorescent lamps in many places as a source of lighting. What are the common testing standards for LED?
Limits and methods of measurement of radio interference characteristics of electrical lighting and similar equipment.
CISPR 15: 2013 applies to the following emitted (radiated and conducted) radio frequency interference:
The main function of all lighting equipment is to generate and / or distribute light for lighting purposes and to connect to low voltage power sources or for battery operation;
The lighting part of a multifunctional device, one of its main functions is lighting;
Independent auxiliary equipment dedicated to lighting equipment;
Ultraviolet and infrared radiation equipment;
Street / flood lighting for outdoor use;
And transportation lighting (installed on buses and trains).
Outside the scope of this standard are:
Lighting equipment operating in the ISM band;
Aircraft and airport lighting;
As well as equipment that explicitly sets electromagnetic compatibility requirements in the RF range in other CISPR standards. The frequency range covered is from 9 kHz to 400 GHz.
General lighting equipment-EMC immunity requirements
The natural environment of outdoor lighting greatly affects its service life and lighting effects. In addition to outdoor lighting complying with relevant standards, the sealing performance of the product itself will change with the use of time. One of the application areas of the IP series immersion protection test chamber produced by LIB is outdoor lighting, which is used to test the waterproofing of lighting Rating and dust rating. The test chamber meets CE certification and quality inspection certification.
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