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Ten Most-Important EMC Problems/Issues and How to Correct Them:
3. Switching Devices Generating Emissions



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Above: Switched-power noise path in a motor drive.

Switched high-voltages are coupled to heat sinks and radiate EMI.

Solution: Use bypassing (via capacitors) and ground the heatsink (at multiple points).

       
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Updated: Friday, 2007-09-28 1:16 PST