Enhancing a power supply to ensure EMI compliance: with a few components and the proper installation, EMI compliance should be easy.(design feature)(electromagnetic-interference)(VDE-Association for Electrical, Electronic & Information Technologies)

EDN, February, 2005 by Curatolo, Tom; Cogger, Steve

IN THE UNITED STATES AND EUROPE, Class A and Class B limits of FCC (Federal Communications Commission) and VDE (European association for electrical, electronic, and information technologies) standards govern conducted-noise emissions. In the United States, the FCC requires compliance with Class A for equipment operating in factory settings and Class B--the stricter standard--for equipment destined for home use. In Europe, all countries require that equipment for both home and factory use meets the VDE Class B standard.

Most switching power supplies today operate in the frequency range of 100 kHz to 1 MHz. Usually, the dominant peaks in the conducted-noise spectrum reflect back to the power line, corresponding to the fundamental switching frequency and its...

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