Enhancing a power supply to ensure EMI compliance

Focus:

Electromagnetic interference (EMI) comes in the form of both radiated and conducted emissions. This article focuses on the latter, discussing filtering techniques need to ensure the compliance of dc-dc converter modules with FCC and VDE limits on conducted emissions. Following a quick overview of FCC and VDE Class A and Class B and EN55011 and EN55022 requirements, the article discusses passive filtering techniques applied at the input of dc-dc converters, the size advantage of active filtering----particularly in telecom blades as required by PICMG 3.0 (also called ATCA (Advanced Telecom Computing Architecture) ). Performance results for the different filtering techniques are shown.

What you’ll learn:

• How to apply passive filtering techniques to dc-dc converters to meet FCC and VDE limits on conducted EMI
• How to apply active filter modules to dc-dc converters to meet FCC and VDE limits on conducted EMI
• How to apply to meet PICMG 3.0 requirements for conducted EMI on telecom blades

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Author & Publication:

Tom Curatolo, Vicor Corp and Steve Cogger, Picor Corp, EDN, Feb 17 2005

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