The LED driver is responsible for all EMC-related issues. Other components-such as LEDs, cables, heat sinks, housings act as antennas and reference ground planes, and can increase radiated emissions and conducted emissions.

If there are LED drivers on the market, they should be tested and certified by FCC, CE or other marks. LED drivers are usually tested using the same standards as LED lamps or LED lamps:

1. EN 55015 Limits and measurement methods of radio interference characteristics of electrical lighting and similar equipment;
2. EN 61000-3-2 Electromagnetic compatibility (EMC)-Part 3-2: Limitation-Limitation of harmonic current emission (equipment input Current ≤ 16 A per phase);
3. EN 61547 Equipment for general lighting-EMC immunity requirements (IEC 61547: 2009).

LED lighting equipment manufacturers often buy tested and marked LED drivers, install them in their equipment and send them to EMC testing laboratories. Afterwards, they obtained official results from the EMC test laboratory: "The equipment does not meet the emission standards, which makes the manufacturer unable to understand-why?

Below Jedver will talk about the main three reasons for the above problems:
1. The LED driver manufacturer has not tested the driver at all or has not tested the driver or has not tested the driver during the manufacturing process after testing and certification. The current version of the LED driver or the electronic components in the LED driver have been replaced.
2. The LED driver is tested in EMC laboratory and passed all tests. The driver is tested as a separate device-no LED as a load, no housing and actual wiring, as in a real LED light. LED drivers are usually tested with a resistive load of 1.5 meters long AC power cord and a dozen centimeters long DC cable or sometimes with a parallel resistive load with 10 UF and 0,1 layer micro-farad capacitors. This situation is different from the actual LED lights, so the test results may be different. In particular, if it is the above reason; then, the LED driver has been tested and the measured emission is very close to the limit line.
3. The LED lamp manufacturer has not followed the installation guide provided by the LED driver manufacturer, and the driver emits excessive emissions. No consideration is given to the side of the AC drive where the usual point is grounded.